NGC 959 | |
---|---|
Observation data (J2000 epoch) | |
Constellation | Triangulum |
Right ascension | 02h 32m 23.923s[1] |
Declination | +35° 29′ 40.46″[1] |
Heliocentric radial velocity | 596 km/s[2] |
Distance | 36 Mly (11.0 Mpc)[2][3] |
Group or cluster | NGC 1023 Group[4] |
Apparent magnitude (V) | 12.38±0.14[3] |
Apparent magnitude (B) | 12.95±0.14[3] |
Characteristics | |
Type | Sdm:[3] or SBcd[5] |
Mass | 6.3×108[6] (stellar) M☉ |
Size | 21.8 kly (6.69 kpc)[7] |
Apparent size (V) | 2′.3 × 1′.4[3] (D25) |
Other designations | |
IRAS 02293+3516, NGC 959, UGC 2002, LEDA 9665, MCG +06-06-051, PGC 9665[8][9] |
NGC 959 is a spiral galaxy in the northern constellation of Triangulum.[10] It was discovered on 9 November 1876 by French astronomer Édouard Stephan.[9] This galaxy is located at a distance of 36 million light years and is receding with a heliocentric radial velocity of 596 km/s.[2] It is a member of the NGC 1023 Group of galaxies.[4]
The morphological class of this galaxy is Sdm:,[3] indicating it is a spiral (S) with disorganized, irregular arms and no central bulge (dm). The ':' suffix indicates some uncertainty about the classification. It has a visual magnitude of 12.4.[3] The galactic plane is inclined at an angle of 50° to the plane of the sky,[11] giving it an elliptical profile with the major axis aligned along a position angle of 65°. The size of the D25 ellipse (where the brightness of the galaxy drops to magnitude 25) is 2.3 × 1.4 arcminutes.[3]
When images of NGC 959 are corrected for the effects of extinction from dust, a central bar feature can be discerned. The galaxy then shows a non-negligible bulge or central condensation, and may instead have a morphological type of SBcd.[5] It displays a cuspy central density profile and bulge-like monotonic decrease in ellipticity toward the core.[6]
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