2026-04-20T06:08:39Z http://vo.astronet.ru/cas/registry.php

ivo://astronet.ru 2006-01-01T00:00:00Z Authority ivo_managed

SAI VO ivo://astronet.ru Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Virtual Observatory Virtual Observatory project at the Sternberg Astronomical Institute provides public access to the growing set of astronomical services developed by the SAI RVO in accordance with the Virtual Observatory standards. http://vo.astronet.ru/about.html Sternberg Astronomical Institute Virtual Observatory Project

ivo://astronet.ru/organisation 2006-01-01T00:00:00Z Organisation ivo_managed

SAI VO ivo://astronet.ru/organisation Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Virtual Observatory Virtual Observatory project at the Sternberg Astronomical Institute provides public access to the growing set of astronomical services developed by the SAI RVO in accordance with the Virtual Observatory standards. http://vo.astronet.ru/about.html Organisation

ivo://astronet.ru/cas/registry 2006-01-01T00:00:00Z Registry ivo_managed

SAI CAS ivo://astronet.ru/cas/registry Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Virtual Observatory SAI CAS publishing registry http://vo.astronet.ru/about.html Registry http://vo.astronet.ru/cas/registry.php 0 false astronet.ru

ivo://astronet.ru/cas/denis 2006-06-17T10:26:48Z ConeSearch ivo_managed

denis ivo://astronet.ru/cas/denis Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs This catalogue is the latest incremental release of the DENIS project. It consists of a set of 355,220,325 point sources detected by the DENIS survey in 3662 strips (covering each 30 degrees in declination and 12 arcmin in right ascension). The data in this release cover approximately 16700 square degrees of the Southern sky. Multiple detections of single point sources have been merged in image overlaps within individual strips, but sources can have multiple detections in overlaping strips. DENIS is the only astronomical survey of the Southern sky made in two near-infrared bands (J at 1.25{mu}m, and K_s_ at 2.15{mu}m) and one optical band (Gunn-i at 0.82{mu}m), with limiting magnitudes 16.5, 14 and 18.5, respectively. Saturation magnitudes are K_s_=6, J=7.5 and Gunn-i=9.8mag. It was conducted by a European consortium, using the 1m telescope at ESO, La Silla (Chile). The DENIS instrument is made up of a 3-channel camera built of commercially available detector arrays by the Observatoire de Paris and with major contributions from other European Institutes, notably: the IAS in Frascati, the Observatoire de Grenoble, the University of Innsbruck, the Observatoire de Lyon, and the IAC in Tenerife. The survey is carried out by observing strips of 30{deg} in declination and 12arcminutes in Right Ascension with an overlap of 2 arcminutes between consecutive strips. The survey started at the end of 1995 and has been completed up to 97% in 2001. The data have been reduced at the Institut d'Astrophysique de Paris and Observatoire de Paris. The position of a general extracted point source is provided with an accuracy better than 1arcsec and its magnitude to better than 0.1 mag. The Centre de Donnees Astronomiques de Strasbourg (CDS) is releasing the final databases and provides access of the processed and calibrated data to the worldwide community. The principal investigator of the DENIS project is N. Epchtein (Observatoire de la Cote d'Azur); the Co-PI in charge of data processing is G. Simon (observatoire de Paris); J. Borsenberger and B. de Batz, with the help of F. Tanguy, S. Begon and P. Texier, processed the data and implemented the working data base at PDAC; S. Derriere is in charge of the data release at CDS. Scientists and engineers from seven European countries and from Brazil are involved in the data qualification and analysis. http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=denis&tab=main& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/usnoa2 2006-06-17T10:26:48Z ConeSearch ivo_managed

usnoa2 ivo://astronet.ru/cas/usnoa2 Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs USNO-A2.0 is a catalog of 526,280,881 stars, and is based on a re-reduction of the Precision Measuring Machine (PMM) scans that were the basis for the USNO-A1.0 catalog. The major difference between A2.0 and A1.0 is that A1.0 used the Guide Star Catalog (Lasker et al. 1986, as its reference frame whereas A2.0 uses the ICRF as realized by the USNO ACT catalog (Urban et al. 1997). http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=usnoa2&tab=main& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/twomass-psc 2006-06-17T10:26:48Z ConeSearch ivo_managed

twomass-psc ivo://astronet.ru/cas/twomass-psc Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs The Two Micron All Sky Survey (2MASS) project is designed to close the gap between our current technical capability and our knowledge of the near-infrared sky. In addition to providing a context for the interpretation of results obtained at infrared and other wavelengths, 2MASS will provide direct answers to immediate questions on the large-scale structure of the Milky Way and the Local Universe. To achieve these goals, 2MASS is uniformly scanning the entire sky in three near-infrared bands to detect and characterize point sources brighter than about 1 mJy in each band, with signal-to-noise ratio (SNR) greater than 10, using a pixel size of 2.0". This will achieve an 80,000-fold improvement in sensitivity relative to earlier surveys. 2MASS uses two new, highly-automated 1.3-m telescopes, one at Mt. Hopkins, AZ, and one at CTIO, Chile. Each telescope is equipped with a three-channel camera, each channel consisting of a 256x256 array of HgCdTe detectors, capable of observing the sky simultaneously at J (1.25 {mu}m), H (1.65 {mu}m), and Ks (2.17 {mu}m), to a 3{sigma} limiting sensitivity of 17.1, 16.4 and 15.3mag in the three bands. The 2MASS arrays image the sky while the telescopes scan smoothly in declination at a rate of ~1' per second. The 2MASS data "tiles" are 6 deg. long in the declination direction and one camera frame (8.5') wide. The camera field-of-view shifts by ~1/6 of a frame in declination from frame-to-frame. The camera images each point on the sky six times for a total integration time of 7.8 s, with sub-pixel "dithering", which improves the ultimate spatial resolution of the final Atlas Images. The University of Massachusetts (UMass) is responsible for the overall management of the project, and for developing the infrared cameras and on-site computing systems at both facilities. The Infrared Processing and Analysis Center (IPAC) is responsible for all data processing through the Production Pipeline, and construction and distribution of the data products. The 2MASS project involves the participation of members of the Science Team from several different institutions. The 2MASS project is funding by the National Aeronautics and Space Administration (NASA) and the National Science Foundation (NSF). Acknowledging 2MASS in publications: Please include the following in any published material that makes use of the 2MASS data products: "This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation." http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=twomass&tab=psc& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/twomass-xsc 2006-06-17T10:26:48Z ConeSearch ivo_managed

twomass-xsc ivo://astronet.ru/cas/twomass-xsc Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs The Two Micron All Sky Survey (2MASS) project is designed to close the gap between our current technical capability and our knowledge of the near-infrared sky. In addition to providing a context for the interpretation of results obtained at infrared and other wavelengths, 2MASS will provide direct answers to immediate questions on the large-scale structure of the Milky Way and the Local Universe. To achieve these goals, 2MASS is uniformly scanning the entire sky in three near-infrared bands to detect and characterize point sources brighter than about 1 mJy in each band, with signal-to-noise ratio (SNR) greater than 10, using a pixel size of 2.0". This will achieve an 80,000-fold improvement in sensitivity relative to earlier surveys. 2MASS uses two new, highly-automated 1.3-m telescopes, one at Mt. Hopkins, AZ, and one at CTIO, Chile. Each telescope is equipped with a three-channel camera, each channel consisting of a 256x256 array of HgCdTe detectors, capable of observing the sky simultaneously at J (1.25 {mu}m), H (1.65 {mu}m), and Ks (2.17 {mu}m), to a 3{sigma} limiting sensitivity of 17.1, 16.4 and 15.3mag in the three bands. The 2MASS arrays image the sky while the telescopes scan smoothly in declination at a rate of ~1' per second. The 2MASS data "tiles" are 6 deg. long in the declination direction and one camera frame (8.5') wide. The camera field-of-view shifts by ~1/6 of a frame in declination from frame-to-frame. The camera images each point on the sky six times for a total integration time of 7.8 s, with sub-pixel "dithering", which improves the ultimate spatial resolution of the final Atlas Images. The University of Massachusetts (UMass) is responsible for the overall management of the project, and for developing the infrared cameras and on-site computing systems at both facilities. The Infrared Processing and Analysis Center (IPAC) is responsible for all data processing through the Production Pipeline, and construction and distribution of the data products. The 2MASS project involves the participation of members of the Science Team from several different institutions. The 2MASS project is funding by the National Aeronautics and Space Administration (NASA) and the National Science Foundation (NSF). Acknowledging 2MASS in publications: Please include the following in any published material that makes use of the 2MASS data products: "This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation." http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=twomass&tab=xsc& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/gsc1_2 2006-06-17T10:26:48Z ConeSearch ivo_managed

gsc1_2 ivo://astronet.ru/cas/gsc1_2 Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs The Guide Star Catalog (GSC), which has been constructed to support the operational need of the Hubble Space Telescope contains nearly 19 million objects brighter than sixteenth magnitude, of which more than 15 million are classified as stars. This catalog provides positions and magnitudes for these stars. The original version of this catalog, GSC 1.0, is described in a series of papers: Lasker et al. (1990AJ.....99.2019L); Russell et al. (1990AJ.....99.2059R); and Jenkner et al. (1990AJ.....99.2082J) The reference material for the GSC 1.2 reduction is the "Positions and Proper Motions Catalogue": PPM-North, Roeser S. and Bastian U., 1988 PPM-South, Bastian U. and Roeser S., 1993 PPM-Suppl, Roeser S., Bastian U. and Kuzmin A., 1994 and the Astrographic Catalogue (AC) which was used to remove the mean systematics common to all the plates. The overall rms error of the GSC 1.2 is estimated better than 0.3arcsec http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=gsc1_2&tab=main& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/tycho2 2006-06-17T10:26:48Z ConeSearch ivo_managed

tycho2 ivo://astronet.ru/cas/tycho2 Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs The Tycho-2 Catalogue is an astrometric reference catalogue containing positions and proper motions as well as two-colour photometric data for the 2.5 million brightest stars in the sky. The Tycho-2 positions and magnitudes are based on precisely the same observations as the original Tycho Catalogue (hereafter Tycho-1) collected by the star mapper of the ESA Hipparcos satellite, but Tycho-2 is much bigger and slightly more precise, owing to a more advanced reduction technique. Components of double stars with separations down to 0.8 arcsec are included. Proper motions precise to about 2.5 mas/yr are given as derived from a comparison with the Astrographic Catalogue and 143 other ground-based astrometric catalogues, all reduced to the Hipparcos celestial coordinate system. Tycho-2 supersedes in most applications Tycho-1, as well as the ACT and TRC catalogues based on Tycho-1. Supplement-1 lists stars from the Hipparcos and Tycho-1 Catalogues which are not in Tycho-2. Supplement-2 lists 1146 Tycho-1 stars which are probably either false or heavily disturbed. For more information, please consult the Tycho-2 home page: http://www.astro.ku.dk/~erik/Tycho-2 Catalogue Characteristics: The principal characteristics of the Tycho-2 Catalogue are summarized below. By means of proper motions the positions are transferred to the year 2000.0, the epoch of the catalogue. The median values of internal standard errors are given. Mean satellite observation epoch ~J1991.5 Epoch of the Tycho-2 Catalogue J2000.0 Reference system ICRS coincidence with ICRS (1) +/-0.6 mas deviation from inertial (1) +/-0.25 mas/yr Number of entries 2,539,913 Astrometric standard errors (2) V_T_ < 9 mag 7 mas all stars, positions 60 mas all stars, proper motions 2.5 mas/yr Photometric std. errors (3) on V_T_ V_T_ < 9 mag 0.013 mag all stars 0.10 mag Star density b= 0 deg 150 stars/sq.deg. b= +/-30 deg 50 stars/sq.deg. b= +/-90 deg 25 stars/sq.deg. Completeness to 90 per cent V ~ 11.5 mag Completeness to 99 per cent V ~ 11.0 mag Number of Tycho observations ~300 10^6^ Note (1): about all 3 axes Note (2): ratio of external to internal standard errors is ~1.0 for positions and for proper motions. Systematic errors are less than 1 mas and 0.5 mas/yr Note (3): ratio of photometric external to internal standard errors at V_T_ > 9 mag is below 1.5 http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=tycho2&tab=main& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/tycho2-suppl_1 2006-06-17T10:26:48Z ConeSearch ivo_managed

tycho2-suppl_1 ivo://astronet.ru/cas/tycho2-suppl_1 Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs The Tycho-2 Catalogue is an astrometric reference catalogue containing positions and proper motions as well as two-colour photometric data for the 2.5 million brightest stars in the sky. The Tycho-2 positions and magnitudes are based on precisely the same observations as the original Tycho Catalogue (hereafter Tycho-1) collected by the star mapper of the ESA Hipparcos satellite, but Tycho-2 is much bigger and slightly more precise, owing to a more advanced reduction technique. Components of double stars with separations down to 0.8 arcsec are included. Proper motions precise to about 2.5 mas/yr are given as derived from a comparison with the Astrographic Catalogue and 143 other ground-based astrometric catalogues, all reduced to the Hipparcos celestial coordinate system. Tycho-2 supersedes in most applications Tycho-1, as well as the ACT and TRC catalogues based on Tycho-1. Supplement-1 lists stars from the Hipparcos and Tycho-1 Catalogues which are not in Tycho-2. Supplement-2 lists 1146 Tycho-1 stars which are probably either false or heavily disturbed. For more information, please consult the Tycho-2 home page: http://www.astro.ku.dk/~erik/Tycho-2 Catalogue Characteristics: The principal characteristics of the Tycho-2 Catalogue are summarized below. By means of proper motions the positions are transferred to the year 2000.0, the epoch of the catalogue. The median values of internal standard errors are given. Mean satellite observation epoch ~J1991.5 Epoch of the Tycho-2 Catalogue J2000.0 Reference system ICRS coincidence with ICRS (1) +/-0.6 mas deviation from inertial (1) +/-0.25 mas/yr Number of entries 2,539,913 Astrometric standard errors (2) V_T_ < 9 mag 7 mas all stars, positions 60 mas all stars, proper motions 2.5 mas/yr Photometric std. errors (3) on V_T_ V_T_ < 9 mag 0.013 mag all stars 0.10 mag Star density b= 0 deg 150 stars/sq.deg. b= +/-30 deg 50 stars/sq.deg. b= +/-90 deg 25 stars/sq.deg. Completeness to 90 per cent V ~ 11.5 mag Completeness to 99 per cent V ~ 11.0 mag Number of Tycho observations ~300 10^6^ Note (1): about all 3 axes Note (2): ratio of external to internal standard errors is ~1.0 for positions and for proper motions. Systematic errors are less than 1 mas and 0.5 mas/yr Note (3): ratio of photometric external to internal standard errors at V_T_ > 9 mag is below 1.5 http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=tycho2&tab=suppl_1& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/tycho2-suppl_2 2006-06-17T10:26:48Z ConeSearch ivo_managed

tycho2-suppl_2 ivo://astronet.ru/cas/tycho2-suppl_2 Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs The Tycho-2 Catalogue is an astrometric reference catalogue containing positions and proper motions as well as two-colour photometric data for the 2.5 million brightest stars in the sky. The Tycho-2 positions and magnitudes are based on precisely the same observations as the original Tycho Catalogue (hereafter Tycho-1) collected by the star mapper of the ESA Hipparcos satellite, but Tycho-2 is much bigger and slightly more precise, owing to a more advanced reduction technique. Components of double stars with separations down to 0.8 arcsec are included. Proper motions precise to about 2.5 mas/yr are given as derived from a comparison with the Astrographic Catalogue and 143 other ground-based astrometric catalogues, all reduced to the Hipparcos celestial coordinate system. Tycho-2 supersedes in most applications Tycho-1, as well as the ACT and TRC catalogues based on Tycho-1. Supplement-1 lists stars from the Hipparcos and Tycho-1 Catalogues which are not in Tycho-2. Supplement-2 lists 1146 Tycho-1 stars which are probably either false or heavily disturbed. For more information, please consult the Tycho-2 home page: http://www.astro.ku.dk/~erik/Tycho-2 Catalogue Characteristics: The principal characteristics of the Tycho-2 Catalogue are summarized below. By means of proper motions the positions are transferred to the year 2000.0, the epoch of the catalogue. The median values of internal standard errors are given. Mean satellite observation epoch ~J1991.5 Epoch of the Tycho-2 Catalogue J2000.0 Reference system ICRS coincidence with ICRS (1) +/-0.6 mas deviation from inertial (1) +/-0.25 mas/yr Number of entries 2,539,913 Astrometric standard errors (2) V_T_ < 9 mag 7 mas all stars, positions 60 mas all stars, proper motions 2.5 mas/yr Photometric std. errors (3) on V_T_ V_T_ < 9 mag 0.013 mag all stars 0.10 mag Star density b= 0 deg 150 stars/sq.deg. b= +/-30 deg 50 stars/sq.deg. b= +/-90 deg 25 stars/sq.deg. Completeness to 90 per cent V ~ 11.5 mag Completeness to 99 per cent V ~ 11.0 mag Number of Tycho observations ~300 10^6^ Note (1): about all 3 axes Note (2): ratio of external to internal standard errors is ~1.0 for positions and for proper motions. Systematic errors are less than 1 mas and 0.5 mas/yr Note (3): ratio of photometric external to internal standard errors at V_T_ > 9 mag is below 1.5 http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=tycho2&tab=suppl_2& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/nomad 2006-06-17T10:26:48Z ConeSearch ivo_managed

nomad ivo://astronet.ru/cas/nomad Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs The U.S. Naval Observatory (USNO) announces the release of the first version of the Naval Observatory Merged Astrometric Dataset (NOMAD). The almost 100 GB dataset contains astrometric and photometric data for about 1.1 billion stars derived from the Hipparcos, Tycho-2, UCAC2, Yellow-Blue 6, and USNO-B catalogs for astrometry and optical photometry, supplemented by 2MASS near-infrared photometry. For each unique star the "best" astrometric and photometric data are chosen from the source catalogs and merged into a single dataset. A sequence of priorities is followed and NOMAD contains flags to identify the source catalogs and gives cross-reference identifications. This first release of NOMAD is not a compiled catalog; that is, if a star is identified in more than 1 of the above mentioned catalogs, only 1 catalog entry is chosen. Thus the local and global systematic errors of the various source catalogs will be present in this version of NOMAD. All source catalogs astrometric data are on the International Celestial Reference System within the limitations of the source catalogs. Catalogs used: Hipparcos Catalogue: Positions, proper motions and errors are used; however, no parallaxes are included in NOMAD. Tycho-2: is a compiled catalog with proper motions derived from the combination of Hipparcos satellite measures (mainly its star tracker data) and over 100 ground-based astrometric catalogs which provided the early epoch data. Most of the Tycho B and V magnitudes (which includes Hipparcos stars) went into NOMAD as well. UCAC2: is also a compiled catalog, including all catalogs used for Tycho-2 (thus also including Tycho and Hipparcos astrometric data), plus the recent epoch ground-based observations of the UCAC project. However, only 86\% of the sky are covered by UCAC2 (the north celestial pole area is missing). For stars not in USNO-B, the UCAC2 magnitude has been used as "R" photometry value, although the UCAC2 bandpass is between V and R. YB6: (Yellow-Blue catalog version 6) is unpublished data obtained from complete scans of the NPM and SPM plates performed on the PMM at USNO, Flagstaff Station. The limiting magnitude is about 18 and YB6 is the major source of faint B and V magnitudes in NOMAD. 2MASS: the near IR photometry without errors or flags has been copied into NOMAD. For those stars without optical counterparts, the 2MASS astrometric information was used (no proper motions). USNO-B: provides positions and proper motions for most faint stars in NOMAD. Most R photometry in NOMAD comes from this catalog. For more details, see the catalog introductions for each individual catalog used in NOMAD. NOMAD is not a compiled catalog, no average values are taken if a star appears in more than 1 source catalog. Each astrometric and photometric entry in NOMAD is taken from a specific source catalog. The priority order is as follows: astrometry brighter than 8 mag: Hipparcos Tycho-2 UCAC2 astrometry of fainter stars: Hipparcos UCAC2 Tycho-2 USNO-B YB6 2MASS photometry: optical Tycho-2 (incl. Hipparcos stars) YB6 USNO-B UCAC2 photometry: near IR 2MASS http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=nomad&tab=main& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/ucac2 2006-06-17T10:26:48Z ConeSearch ivo_managed

ucac2 ivo://astronet.ru/cas/ucac2 Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs The UCAC2 is the second release of the ongoing UCAC project, designed to observe the entire sky for R magnitudes of about 7.5 to 16. The observed positional errors are about 20 mas for the stars in the 10 to 14 magnitude range, and about 70 mas at the limiting magnitude of R ~16. For up-to-date information on the project, see our web page at http://ad.usno.navy.mil/ucac/ . This web page will also serve as the location that the UCAC team will post addenda to the UCAC2 catalog. The UCAC2 is a high density, highly accurate, astrometric catalog of 48,330,571 stars covering the sky from -90 to +40 degrees in declination and going up to +52 degrees in some areas. The northern limit is a function of right ascension. Proper motions and photometry are provided for all stars. Positions and proper motions are on the ICRS (International Celestial Reference System) and given at the epoch J2000.0. The UCAC2 has a number of major differences with respect to UCAC1. These differences include: - much larger sky coverage - reduced systematic errors of CCD observations - positions given at a standard epoch (J2000.0) - the addition of several new catalogs for improved proper motions - photometry in the J, H, and K_s bands from the 2MASS project - data in binary format for direct access - inclusion of software to aid users in quick access of the data Additional details of the data are found in Sections 3, 4, and 5 of this document. http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=ucac2&tab=main& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/sdssdr5-photoobjall 2006-06-17T10:26:48Z ConeSearch ivo_managed

sdssdr5-photoobj ivo://astronet.ru/cas/sdssdr5-photoobjall Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs The Sloan Digital Sky Survey is a project to survey a 10000 square degree area on the Northern sky over a 5 year period. A dedicated 2.5m telescope is specially designed to take wide field (3 degrees in diameter) images using a 5x6 mosaic of 2048x2048 CCD, in five wavelength bands, operating in drift scan mode. The total raw data will exceed 40 TB. A processed subset, of about 1 TB in size, will consist of 1 million spectra, positions and image parameters for over 100 million objects, plus a mini-image centered on each object in every color. The data will be made available to the public after the completion of the survey http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=sdssdr5&tab=photoobjall& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/sdssdr5-phototag 2006-06-17T10:26:48Z ConeSearch ivo_managed

sdssdr5-phototag ivo://astronet.ru/cas/sdssdr5-phototag Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs The Sloan Digital Sky Survey is a project to survey a 10000 square degree area on the Northern sky over a 5 year period. A dedicated 2.5m telescope is specially designed to take wide field (3 degrees in diameter) images using a 5x6 mosaic of 2048x2048 CCD, in five wavelength bands, operating in drift scan mode. The total raw data will exceed 40 TB. A processed subset, of about 1 TB in size, will consist of 1 million spectra, positions and image parameters for over 100 million objects, plus a mini-image centered on each object in every color. The data will be made available to the public after the completion of the survey http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=sdssdr5&tab=phototag& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/xmm2p 2006-06-17T10:26:48Z ConeSearch ivo_managed

xmm2p ivo://astronet.ru/cas/xmm2p Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=xmm2p&tab=main& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/usnob1 2006-06-17T10:26:48Z ConeSearch ivo_managed

usnob1 ivo://astronet.ru/cas/usnob1 Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs The USNO-B1.0 is a catalog that presents positions, proper motions, magnitudes in various optical passbands, and star/galaxy estimators for 1,045,913,669 objects derived from 3,648,832,040 separate observations. The data were taken from scans of 7,435 Schmidt plates taken from various sky surveys during the last 50 years. The catalog is expected to be complete down to V=21; the estimated accuracies are 0.2arcsec for the positions at J2000, 0.3mag in up to 5 colors, and 85% accuracy for distinguishing stars from non-stellar objects. http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=usnob1&tab=main& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/gsc2_3_2 2006-06-17T10:26:48Z ConeSearch ivo_managed

gsc2_3_2 ivo://astronet.ru/cas/gsc2_3_2 Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs The Guide Star Catalog II (GSC-II) is an all-sky optical catalog based on 1" resolution scans of the photographic Sky Survey plates, at two epochs and three bandpasses, from the Palomar and UK Schmidt telescopes. This all-sky catalog will ultimately contains positions, proper motions, classifications, and magnitudes in multiple bandpasses for almost a billion objects down to approximately Jpg=21, Fpg=20. The GSC-II is currently used for HST Bright Object Protection, and will replace GSC-I for HST pointing in cycle 15. Looking ahead, the GSC-II will form the basis of the Guide Star Catalog for JWST. This was constructed in collaboration with ground-based observatories http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=gsc2_3_2&tab=main& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/sdssdr6-photoobjall 2006-06-17T10:26:48Z ConeSearch ivo_managed

sdssdr6-photoobj ivo://astronet.ru/cas/sdssdr6-photoobjall Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=sdssdr6&tab=photoobjall& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/sdssdr6-phototag 2006-06-17T10:26:48Z ConeSearch ivo_managed

sdssdr6-phototag ivo://astronet.ru/cas/sdssdr6-phototag Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=sdssdr6&tab=phototag& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/sdssdr6-photoprofile 2006-06-17T10:26:48Z ConeSearch ivo_managed

sdssdr6-photopro ivo://astronet.ru/cas/sdssdr6-photoprofile Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=sdssdr6&tab=photoprofile& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/ucac3 2006-06-17T10:26:48Z ConeSearch ivo_managed

ucac3 ivo://astronet.ru/cas/ucac3 Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs UCAC3 is a compiled, all-sky star catalog covering mainly the 8 to 16 magnitude range in a single bandpass between V and R. Positional errors are about 15 to 20 mas for stars in the 10 to 14 mag range. It is supplemented by proper motions and SuperCosmos and 2MASS photometric data, as well as various flags. The proper motions of bright stars are based on about 140 catalogs, including Hipparcos and Tycho, as well as all catalogs used for the Tycho-2 proper motion construction. Proper motions of faint stars are based on a re-reduction of early epoch SPM data (-90 to -10 deg Dec) plus Schmidt plate data from the SuperCosmos project (down weighted due to systematic errors of order 100 mas). The proper motions of faint stars (R <= 13.5) therefore should be used with caution. The unpublished plate measure data from the AGK2, the Hamburg Zone Astrograph, the USNO Black Birch Astrograph, and the Lick Astrograph have considerably contributed to improve proper motions for stars mainly in the 10 to 14 mag range (down to the UCAC3 limit for Lick data); however, these data do not cover all sky. UCAC3 features a number of major differences with respect to UCAC2: - complete sky coverage - re-reduction of the pixel data with better modeling - double stars are resolved to the limit of the data - significantly improved photometry from CCD data - slightly deeper limiting magnitude with larger number of stars/area - reduced systematic errors of CCD observations - the addition of several new catalogs for improved proper motions - photometry in the B, R, and I bands from the SuperCosmos project - minor planet observations have been sorted out - identification of more high proper motion stars - match with 2MASS extended sources and LEDA galaxies Additional details will be published in the upcoming release paper (Zacharias et al. 2009) and in several technical papers describing details of the reduction procedures and results. For the latest updates see http://www.usno.navy.mil/usno/astrometry . http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=ucac3&tab=main& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/sdssdr7-field 2006-06-17T10:26:48Z ConeSearch ivo_managed

sdssdr7-field ivo://astronet.ru/cas/sdssdr7-field Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=sdssdr7&tab=field& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/sdssdr7-specobjall 2006-06-17T10:26:48Z ConeSearch ivo_managed

sdssdr7-specobja ivo://astronet.ru/cas/sdssdr7-specobjall Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=sdssdr7&tab=specobjall& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/sdssdr7-specphotoall 2006-06-17T10:26:48Z ConeSearch ivo_managed

sdssdr7-specphot ivo://astronet.ru/cas/sdssdr7-specphotoall Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=sdssdr7&tab=specphotoall& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/sdssdr7-sppparams 2006-06-17T10:26:48Z ConeSearch ivo_managed

sdssdr7-sppparam ivo://astronet.ru/cas/sdssdr7-sppparams Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=sdssdr7&tab=sppparams& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/sdssdr7-phototag 2006-06-17T10:26:48Z ConeSearch ivo_managed

sdssdr7-phototag ivo://astronet.ru/cas/sdssdr7-phototag Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=sdssdr7&tab=phototag& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/sdssdr7-photoobjall 2006-06-17T10:26:48Z ConeSearch ivo_managed

sdssdr7-photoobj ivo://astronet.ru/cas/sdssdr7-photoobjall Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=sdssdr7&tab=photoobjall& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/ucac4 2006-06-17T10:26:48Z ConeSearch ivo_managed

ucac4 ivo://astronet.ru/cas/ucac4 Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=ucac4&tab=main& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/gaiadr2-gaia_source 2006-06-17T10:26:48Z ConeSearch ivo_managed

gaiadr2-gaia_sou ivo://astronet.ru/cas/gaiadr2-gaia_source Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs </pre><p>Gaia is an ambitious mission to chart a three-dimensional map of our Galaxy, the Milky Way, in the process revealing the composition, formation and evolution of the Galaxy. Gaia will provide unprecedented positional and radial velocity measurements with the accuracies needed to produce a stereoscopic and kinematic census of about one billion stars in our Galaxy and throughout the Local Group. This amounts to about 1 per cent of the Galactic stellar population. <p>The data collected during the first 22 months of the nominal, five-year mission have been processed by the Gaia Data Processing and Analysis Consortium (DPAC), resulting into this second data release. A summary of the release properties is provided in Gaia Collaboration et al. (2018b). The overall scientific validation of the data is described in Arenou et al. (2018). Background information on the mission and the spacecraft can be found in Gaia Collaboration et al. (2016), with a more detailed presentation of the Radial Velocity Spectrometer (RVS) in Cropper et al. (2018). In addition, Gaia DR2 is accompanied by various, dedicated papers that describe the processing and validation of the various data products: Lindegren et al. (2018) for the Gaia DR2 astrometry, Riello et al. (2018) and Evans et al. (2018) for the Gaia DR2 photometry, Sartoretti et al. (2018), Soubiran et al. (2018), and Katz et al. (2018) for the Gaia DR2 spectroscopy (radial velocities), Holl et al. (2018) for the Gaia DR2 variability, Andrae et al. (2018) for the Gaia DR2 astrophysical parameters, Gaia Collaboration et al. (2018g) for the Solar-system objects, and Gaia Collaboration et al. (2018f) for the celestial reference frame. Four more papers present a glimpse of the scientific richness of the data in the areas of the Hertzsprung-Russell diagram (Gaia Collaboration et al. 2018a), the mapping of the kinematics and large-scale structure of the Milky Way (Gaia Collaboration et al. 2018e), parallaxes and proper motions of Milky Way satellite galaxies (Gaia Collaboration et al. 2018d), and variable stars in the colour-magnitude diagram (Gaia Collaboration et al. 2018c). In addition to the set of references mentioned above, this documentation provides a detailed, complete overview of the processing and validation of the Gaia DR2 data. http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=gaiadr2&tab=gaia_source& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/galah_dr2 2006-06-17T10:26:48Z ConeSearch ivo_managed

galah_dr2 ivo://astronet.ru/cas/galah_dr2 Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs </pre><p>GALAH is a large-scale stellar spectroscopic survey project exploring the history of star formation, chemical evolution, stellar migration and minor mergers in the Milky Way. One of the main science goals of GALAH is to use chemical tagging to identify groups of stars that formed at the same place and time, even though they have dispersed throughout the Galaxy, using the similarity of their chemical abundance patterns. Using the HERMES spectrograph at the Anglo-Australian Telescope, we collect high-resolution (R&#126;28,000) spectra for 360 stars simultaneously. These stars are selected simply in magnitude (14&gt;V&gt;12), Galactic latitude (&#124;b&#124;&gt;10) and declination (dec&#60;+10) to maximise our ability to learn about the underlying structure of the Galaxy. <p>There are 342,682 unique stars in DR2, observed between January 2014 and January 2018. For these stars, we have derived radial velocities, stellar parameters, and the abundances of up to 23 elements per star. http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=galah_dr2&tab=main& 3 1000000 false 0 0 0.1

ivo://astronet.ru/cas/wise 2006-06-17T10:26:48Z ConeSearch ivo_managed

wise ivo://astronet.ru/cas/wise Sternberg Astronomical Institute Virtual Observatory Project Sergey Karpov 2007-11-30 Sergey Karpov karpov@sao.ru Catalogs </pre><p>The Wide-field Infrared Survey Explorer (WISE; see Wright et al. 2010AJ....140.1868W 2010AJ....140.1868W) is a NASA Medium Class Explorer mission that conducted a digital imaging survey of the entire sky in the 3.4, 4.6, 12 and 22um mid-infrared bandpasses (hereafter W1, W2, W3 and W4). The AllWISE program extends the work of the successful Wide-field Infrared Survey Explorer mission by combining data from the cryogenic and post-cryogenic survey phases to form the most comprehensive view of the mid-infrared sky currently available. AllWISE has produced a new Source Catalog and Image Atlas with enhanced sensitivity and accuracy compared with earlier WISE data releases. Advanced data processing for AllWISE exploits the two complete sky coverages to measure source motions for each Catalog source, and to compile a massive database of light curves for those objects. http://vo.astronet.ru/cas/ Archive http://vo.astronet.ru/sai_cas/conesearch?cat=wise&tab=main& 3 1000000 false 0 0 0.1