NGC 7331 is the brightest galaxy in the field of a visual grouping known as the NGC 7331 Group of galaxies. In fact, the other members of the group, NGC 7335, NGC 7336, NGC 7337 and NGC 7340, lie far in the background at distances of approximately 300–350 million light years.
All of the members of the NGC 7331 Group, along with NGC 7325, NGC 7326, NGC 7327, NGC 7333, NGC 7338, are listed together as Holm 795 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.
Image Session Details
Scientific Databases
[ POSITION ]
-RA: 339.266878°
-Dec: +34.415778°
-Parallax: 1.075 mas
-Proper motion: pmRA=-0.49 mas/yr, pmDEC=-0.76 mas/yr
-Redshift: 0.002779
-Radial velocity: 832.0 km/s
[ PHOTOMETRY ]
-Catalog: V=9.48, G=16.28, B=10.35
-V: 9.48
-B: 10.35
-B–V: 0.87
-Hubble type (from color): Sa
[ DISTANCE ]
-14350000.00 pc (46.80 Mly, NED-D median, nDistance)
[ ALIASES ]
-2MASX J22370410+3424573, IRAS 22347+3409, IRAS F22347+3409, LEDA 69327, MCG+06-49-045, NGC 7331, UGC 12113
Object Type: Spiral galaxy, SA(s)b
Constellation: Pegasus
Apparent Size: 10.5′ × 3.7′
General Properties
-Coordinates: 22h 37m 04.1s, +34° 24′ 56″ (J2000)
-Apparent Magnitude: 9.4 (V)
-Angular Size: 10.5′ × 3.7′
-Distance: ~14.5 Mpc (≈ 47 million light-years)
-Constellation: Pegasus
-Discovery: Discovered by William Herschel (1784)
-NED
Observation Notes
-Visual Magnitude:9.4
-Photographic Magnitude: 10.0
