| ARP 7 | |
|---|---|
 Arp 7 by PanSTARRS | |
| Observation data (J2000 epoch) | |
| Constellation | Hydra[1] |
| Right ascension | 8h 50m 30.0s[2] |
| Declination | −16° 37′ 00″[2] |
| Redshift | 0.018356 ± 0.000027 (5503 ± 8 km/s)[3] |
| Distance | 19–273 Mly (5.9–83.7 Mpc)[3] |
| Apparent magnitude (V) | 12.40[3] |
| Characteristics | |
| Type | SB(rs)bc [3] |
| Size | 5,200 ly (1.6 kpc) (75,000 ly (23 kpc)?) (estimated)[a][3] |
| Apparent size (V) | 57.1″ × 52.53″ [3] |
| Other designations | |
| PGC 024836,[3] APG 7[2] | |
Arp 7 (PGC 24836) is a spiral galaxy in the constellation Hydra.[1] Redshift-independent measurements of its distance vary widely, from 5.9 Mpc to 83.7 Mpc.[3] Its morphological classification is SB(rs)bc,[3] meaning it is a barred spiral galaxy with some ring-like structure.
Arp 7 was imaged by Halton Arp and included in his Atlas of Peculiar Galaxies under the category of 'split arm' galaxies.[4] Five other galaxies are also included in this section of the atlas: Arp 8 (NGC 497), Arp 9 (NGC 2523), Arp 10 (UGC 1775), Arp 11 (UGC 717), and Arp 12 (NGC 2608).
- ^ a b Seligman, Courtney. "Celestial Atlas: PCG Objects 24500 - 24999". Retrieved 2015-11-25.
- ^ a b c SIMBAD Astronomical Database. Retrieved 2015-11-25.
{{cite book}}:|work=ignored (help) - ^ a b c d e f g h i "NASA/IPAC Extragalactic Database". Results for ARP 007. Archived from the original on 1997-12-22. Retrieved 2015-11-25.
- ^ Arp, Halton (1966). "Atlas of Peculiar Galaxies". Figure 1. Retrieved 2015-11-25.
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