GCVS/? ivo://nasa.heasarc/gcvsnsvars NASA/GSFC HEASARC Samus et al.; Kukarkin et al.; Kazarovets, Durlevich, Samus 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Star This catalog is a compilation of stars that have been suspected of variability but have (mostly) not been finally designated as variables. It is the merging and latest updated version of the compilation of the New Catalog of Suspected Variable Stars (NSV Catalog) originally published in 1982 by Kukarkin et al. and the Supplement to the NSV originally published in 1998 by Kazarovets et al. This version (NSV Release 2) has updated the previous catalog in several ways. The accuracy of coordinates has been drastically improved for the objects in the catalog; for most of them, the authors have revised the photometric and spectroscopic data and updated the remarks. In the cases with no existing finding charts, the authors recovered variability of 2800 stars of the catalog, despite large errors of the previously published coordinates. The data contained in the present catalog include positions, magnitudes, variability types, references to the literature, and spectra. This version of the GCVS catalog was last updated by the HEASARC in June 2026, based on the files <a href="http://www.sai.msu.su/gcvs/gcvs/nsv2/nsv2.txt">http://www.sai.msu.su/gcvs/gcvs/nsv2/nsv2.txt</a> and <a href="http://www.sai.msu.su/gcvs/gcvs/nsvsup/nsvs.dat">http://www.sai.msu.su/gcvs/gcvs/nsvsup/nsvs.dat</a>. These files were last modified by the authors in November 2025. This is a service provided by NASA HEASARC . https://heasarc.gsfc.nasa.gov/W3Browse/all/gcvsnsvars.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=gcvsnsvars& GET text/xml 180 99999 true 222.56025 -89.78305556 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=gcvsnsvars GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_gcvsnsvars&Action=More+Options&Action=Parameter+Search&ConeAdd=1 STAR CATALOG 0.0166666666666667 Optical public gcvsnsvars General Catalog of Variable Stars: Suspected Variable Stars (202 name Catalog Source Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable limit_min_mag Limit and/or Amplitude Flags for Minimum Magnitude/Amplitude meta.code;phot.mag char nullable min_mag Minimum Magnitude or Amplitude mag phot.mag;stat.min double nullable limit_max_mag Limit or Amplitude Flag for Magnitude at Maximum Brightness meta.code;phot.mag char nullable max_mag Magnitude at Maximum Brightness mag phot.mag;stat.max double nullable variability_type Type of Variability meta.code;src.var char nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable note_flag Flag [Y] Indicates Notes in Published Catalog meta.code;src char nullable variability_flag Flag Indicates Variability Seems Doubtful or Erroneous to the Catalog Compilers char nullable spect_type Spectral Type src.spType char nullable coordinates_epoch Epoch of the Coordinates yr time.epoch double nullable lii Galactic Longitude degree pos.galactic.lon double nullable alt_var_name Designation in GCVS meta.id char nullable max_mag_flag Uncertainty Flag [:] for Magnitude at Maximum Brightness meta.code;phot.mag;stat.max char nullable pm_ra Proper Motion-Right Ascension arcsec/yr pos.pm;pos.eq.ra double nullable ref_chart Reference to Star Chart meta.ref char nullable position_flag Position Accuracy Flag meta.code;pos char nullable class Browse Object Classification src.class short nullable min_mag_flag Flag Indicates Uncertainty or Steps for Minimum Magnitude/Amplitude meta.code;phot.mag;stat.min char nullable pm_dec Proper Motion-Declination arcsec/yr pos.pm;pos.eq.dec double nullable ref_star Reference to Star Study meta.ref char nullable alt_name Alternative Designation in Star Study meta.id char nullable nsv Catalog Number (above 15000 for the Supplement) meta.id int nullable ref_astrometry Source of Astrometric Data meta.ref char nullable mag_system Photometric System for Magnitudes meta.code;instr.filter char nullable bii Galactic Latitude degree pos.galactic.lat double nullable