MCG ivo://nasa.heasarc/mcg NASA/GSFC HEASARC Vorontsov-Velyaminov, Arkhipova 2026-04-03 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Galaxy The MCG database contains the "Morphological Catalogue of Galaxies," a compilation of information for approximately 34,000 galaxies found and examined on the Palomar Observatory Sky Survey (POSS). Individual identifiers are assigned for about 29,000 galaxies and information on the remaining 5,000 is present in the extensive notes of the published catalogs (Vorontsov-Velyaminov et al. 1962-1968). The catalog is structured according to the POSS zones and is numbered from +15 (corresponding to +90 deg) to +01 (+06 deg zone) and +00 (equatorial zone) to -05 (-30 deg zone); the fields are numbered with increasing right ascension. The original goal of the compilation was to be complete for galaxies brighter than magnitude 15.1, but the final catalog lists many objects considerably fainter. Information given in the original printed volumes includes: cross- identifications to the NGC (Dreyer 1888) and IC (Dreyer 1895, 1908) catalogs, equatorial coordinates for 1950.0, magnitude, estimated sizes and intensities of the bright inner region and the entire object, estimated inclination, and coded description (by symbols) of the appearance of the galaxy. Each field is then followed by notes on individual objects. All of the above data except the coded description are included in the machine version, except that special coding (e.g. for uncertainty or source designation) is not present (other than for the NGC/IC cross identifications [added at the Astronomical Data Center for this machine version]). Although the notes are not computerized, the presence of a note in the original is flagged in the machine version Detailed descriptions of modifications, corrections and the record format are provided for the machine-readable version of the "Morphological Catalogue of Galaxies" (Vorontsov-Velyaminov et al. 1962-68); see the Additional Information section below. In addition to hundreds of individual corrections, a detailed comparison of the machine-readable with the published catalog resulted in the addition of 116 missing objects, the deletion of 10 duplicate records, and a format modification to increase storage efficiency. This is a service provided by NASA HEASARC . 1962TrSht..32....1V https://heasarc.gsfc.nasa.gov/W3Browse/all/mcg.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=mcg& GET text/xml 180 99999 true 168.703 -33.939 0.25 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=mcg GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_mcg&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.25 Optical public mcg Morphological Galaxy Catalog mag Magnitude phot.mag;em.opt float nullable int_out Intensity of Outer Region of Galaxy I_d meta.code;phot.flux short nullable flag Note Flag meta.code char nullable ra_1950 Right Ascension in 1950 Coordinates degree pos.eq.ra double nullable class Browse Object Classification src.class short nullable "__z_ra_dec" System unit vector column double nullable maj_axis Diameter of Major Axis arcmin phys.angSize;phys.size.smajAxis float nullable dec_1950 Declination in 1950 Coordinates degree pos.eq.dec double nullable dec Declination degree pos.eq.dec;meta.main double nullable bii Galactic Latitude degree pos.galactic.lat double nullable lii Galactic Longitude degree pos.galactic.lon double nullable cdec Declination in Sexagesimal Format pos.eq.dec char nullable in_min Diameter of Minor Axis Bright Inner Port arcmin phys.angSize;phys.size.sminAxis float nullable incl Inclination of Principal Plane meta.code;src.orbital.inclination char nullable cra Right Ascension in Sexagesimal Format pos.eq.ra char nullable name Catalog Designation meta.id char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable in_maj Diameter of Major Axis Bright Inner Port arcmin phys.angSize;phys.size.smajAxis float nullable min_axis Diameter of Minor Axis arcmin phys.angSize;phys.size.smajAxis float nullable int_in Intensity of Inner Region of Galaxy I_d meta.code;phot.flux short nullable cat_num Reference Number NGC or IC meta.id;meta.main char nullable "__row" System index column char nullable