NGC 1003 is a spiral galaxy at the western edge of the Perseus constellation. It is located at a distance of about 36 million light years from the Milky Way and is receding with a heliocentric radial velocity of 624 km/s. This galaxy was discovered by the Anglo-German astronomer William Herschel on October 6, 1784, who described it as "pretty faint, large, extended 90°±, much brighter middle, mottled but not resolved". It is a member of the NGC 1023 group of galaxies.
|Observation data (J2000 epoch)|
|Right ascension||02h 39m 16.893s|
|Declination||+40° 52′ 20.25″|
|Helio radial velocity||624 km/s|
|Distance||35.9 kly (11.02 kpc)|
|Group or cluster||NGC 1023 group|
|Apparent magnitude (B)||12.1|
|Notable features||Warped disk|
|NGC 1003, UGC 2137, MCG +07-06-051, PGC 10052|
The morphological class of NGC 1003 is SAcd, which means it is an unbarred spiral galaxy (SA) with somewhat loosely-wound spiral arms (cd). It is inclined by an angle of 70° to the line of sight from the Earth, with the major axis aligned along a position angle of 276°. The visual disk of the galaxy shows a substantial warping in the eastern side, turning it almost face on. The estimated star formation rate is 0.40 M☉·yr−1. It has a virial mass of 3×1012 M☉ and a mass-to-light ratio of 0.7.