Astronomy:NGC 5857
| NGC 5857 | |
|---|---|
 NGC 5857 imaged by SDSS | |
| Observation data (J2000 epoch) | |
| Constellation | Boötes |
| Right ascension | 15h 07m 27.2818s[1] |
| Declination | +19° 35′ 51.942″[1] |
| Redshift | 0.015834[1] |
| Helio radial velocity | 4,747±2 km/s[1] |
| Distance | 236.3 ± 16.5 Mly (72.44 ± 5.07 Mpc)[1] |
| Group or cluster | 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[1] | |
NGC 5857 is a barred spiral galaxy in the constellation of Boötes. Its velocity with respect to the cosmic microwave background for is 4,911±12 km/s, which corresponds to a Hubble distance of 236.3 ± 16.5 Mly (72.44 ± 5.07 Mpc).[1] In addition, 20 non-redshift measurements give a distance of 228.85 ± 2.06 Mly (70.167 ± 0.633 Mpc).[2] It was discovered by German-British astronomer William Herschel on 27 April 1788.[3]
The SIMBAD database lists NGC 5857 as a Seyfert II Galaxy, i.e. it has a quasar-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]
NGC 5859 Group
According to A. M. Garcia, NGC 5857 is a member of the NGC 5859 galaxy group (also known as LGG 394). This group has six members, including NGC 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]
Supernovae
Two supernovae have been observed in NGC 5857:
- SN 1950H (type unknown, mag. 17.6) was discovered by Fritz Zwicky on 17 March 1950.[7][8]
- SN 1955M (type unknown, mag. 14.5) was discovered by Fritz Zwicky on 14 May 1955.[7][9]
See also
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Results for object NGC 5857". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+5857.
- ↑ "Distance Results for NGC 5857". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+5857.
- ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 5857". https://cseligman.com/text/atlas/ngc58a.htm#5857.
- ↑ "NGC 5857". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+5857.
- ↑ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series 100: 47. Bibcode: 1993A&AS..100...47G.
- ↑ Mahtessian, A. P. (1998). "Groups of galaxies. III. Some empirical characteristics". Astrophysics 41 (3): 308–321. doi:10.1007/BF03036100. Bibcode: 1998Ap.....41..308M.
- ↑ 7.0 7.1 Kowal, C. T.; Zwicky, F.; Sargent, W. L. W.; Searle, L. (1974). "The 1973 Palomar Supernova Search". Publications of the Astronomical Society of the Pacific 86 (512): 516. doi:10.1086/129639. Bibcode: 1974PASP...86..516K.
- ↑ "SN 1950H". IAU. https://www.wis-tns.org/object/1950H.
- ↑ "SN 1955M". IAU. https://www.wis-tns.org/object/1955M.
External links
- NGC 5857 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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