NVSS ivo://nasa.heasarc/nvss NASA/GSFC HEASARC Condon et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the National Radio Astronomy Observatory (NRAO) Very Large Array (VLA) Sky Survey, the so-called NVSS Catalog. The NVSS Catalog covers the sky north of the J2000.0 Declination of -40 degrees (82% of the celestial sphere) at 1.4 GHz. The principal data products of the NVSS were (1) a set of 2326 4 degree by 4 degree continuum "cubes" with three planes containing Stokes I, Q, and U images, plus (2) a catalog of almost 2 million discrete sources stronger than a flux density S of about 2.5 mJy. The images all have 45 arcsecond FWHM angular resolution and nearly uniform sensitivity. Their rms brightness fluctuations are approximately 0.45 mJy/beam = 0.14 K (Stokes I) and approximately 0.29 mJy/beam = 0.09 K (Stokes Q and U). The rms uncertainties in right ascension and declination vary from <= ~1 arcsecond for the 400,000 sources stronger than 15 mJy to 7 arcseconds at the survey limit. The NVSS was made as a service to the astronomical community. All data products, user software, and updates were released via the World-Wide Web as soon as they were produced and verified. For more complete information on the NVSS, please refer to the NVSS website at <a href="http://www.cv.nrao.edu/nvss/">http://www.cv.nrao.edu/nvss/</a> This table was created by the HEASARC in October 2002 based on the file <a href="ftp://ftp.cv.nrao.edu/nvss/CATALOG/NVSSCatalog.text.gz">ftp://ftp.cv.nrao.edu/nvss/CATALOG/NVSSCatalog.text.gz</a> provided by the NVSS Catalog's authors. It was updated by the HEASARC in June 2009 to fix a problem with the original ingest in which the leading digit of some flux fields was lost. This is a service provided by NASA HEASARC . 1998AJ....115.1693C https://heasarc.gsfc.nasa.gov/W3Browse/all/nvss.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=nvss& GET text/xml 180 99999 true 262.460375 -40.43080556 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=nvss GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_nvss&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0166666666666667 Radio public nvss NRAO VLA Sky Survey Catalog name Catalog 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 flux_20_cm Integrated 1.4-GHz Flux Density (mJy) mJy phot.flux.density;em.radio double nullable flux_20_cm_error RMS Uncertainty in Flux Density at 20 cm mJy stat.error;phot.flux.density;em.radio double nullable major_axis_error RMS Uncertainty in Major Axis arcsec stat.error;phys.size.smajAxis double nullable lii Galactic Longitude degree pos.galactic.lon double nullable field_name Name of the Survey Image Field meta.id;obs.field char nullable pol_flux_error RMS Uncertainty in the Integrated Linearly Polarized Flux Density mJy stat.error;phot.flux.density;phys.polarization double nullable dec_error RMS Uncertainty in Declination (arcsec) arcsec stat.error;pos.eq.dec double nullable minor_axis Length of Minor Axis of Radio Source (arcsec) arcsec phys.size.sminAxis double nullable minor_axis_error RMS Uncertainty in Minor Axis arcsec stat.error;phys.size.sminAxis double nullable major_axis Length of Fitted Major Axis of Radio Source (arcsec) arcsec phys.size.smajAxis double nullable residual_flux Residual Flux (mJy/beam) mJy/beam phot.flux.density;em.radio double nullable limit_minor_axis Limit Flag for Fitted Minor Axis meta.code.error;phys.size.sminAxis char nullable y_pixel Y Position of the Pixel Where the Source Is Located in the Field pos.cartesian.y;instr.pixel double nullable bii Galactic Latitude degree pos.galactic.lat double nullable limit_major_axis Limit Flag for Major Axis meta.code.error;phys.size.smajAxis char nullable residual_code Flag Indicates Residual Type: P=Peak, S=Integrated meta.code char nullable ra_error RMS Uncertainty in Right Ascension (s) s stat.error;pos.eq.ra double nullable pol_angle Linear Polarization Position Angle (degree) degree pos.posAng;phys.polarization double nullable x_pixel X Position of the Pixel Where the Source Is Located in the Field pos.cartesian.x;instr.pixel double nullable position_angle Position Angle of the Fitted Major Axis (degree) degree pos.posAng double nullable pol_flux Integrated Linearly Polarized Flux Density (mJy) mJy phot.flux.density;phys.polarization double nullable pol_angle_error RMS Uncertainty in Polarization Angle mJy stat.error;pos.posAng;phys.polarization double nullable position_angle_error RMS Uncertainty in Position Angle degree stat.error;pos.posAng double 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