| NGC 5857 | |
|---|---|
 NGC 5857 imaged bySDSS | |
| Observation data (J2000epoch) | |
| Constellation | Boötes |
| Right ascension | 15h 07m 27.2818s[1] |
| Declination | +19° 35′ 51.942″[1] |
| Redshift | 0.015834[1] |
| Heliocentric radial velocity | 4,747±2 km/s[1] |
| Distance | 236.3 ± 16.5 Mly (72.44 ± 5.07 Mpc)[1] |
| Group orcluster | NGC 5859 Group (LGG 394) |
| Apparent magnitude (V) | 13.1[1] |
| Characteristics | |
| Type | SB(s)b[1] |
| Size | ~107,700 ly (33.03 kpc) (estimated)[1] |
| Apparent size (V) | 1.2′ × 0.6′[1] |
| Other designations | |
| UGC 9724,MCG +03-39-004,PGC 53995,CGCG 106-005[1] | |
NGC 5857 is abarred spiral galaxy in theconstellation ofBoötes. Its velocity with respect to thecosmic microwave background for is4,911±12 km/s, which corresponds to aHubble distance of 236.3 ± 16.5 Mly (72.44 ± 5.07 Mpc).[1] In addition, 20non-redshift measurements give a distance of 228.85 ± 2.06 Mly (70.167 ± 0.633 Mpc).[2] It was discovered by German-British astronomerWilliam Herschel on 27 April 1788.[3]
TheSIMBAD database lists NGC 5857 as aSeyfert II Galaxy, i.e. it has aquasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.[4]
According to A. M. Garcia, NGC 5857 is a member of the NGC 5859 galaxy group (also known asLGG 394). This group has six members, includingNGC 5859, UGC 9620, UGC 9622, UGC 9672, and UGC 9777.[5]
Abraham Mahtessian mentions that NGC 5857 and NGC 5859 form a pair of galaxies and they are in gravitational interaction.[6]
Twosupernovae have been observed in NGC 5857:
Media related toNGC 5857 at Wikimedia Commons
