Astronomy:NGC 977
| NGC 977 | |
|---|---|
 NGC 977 imaged by Legacy Surveys | |
| Observation data (J2000 epoch) | |
| Constellation | Cetus |
| Right ascension | 02h 33m 03.4241s[1] |
| Declination | −10° 45′ 35.544″[1] |
| Redshift | 0.015274±0.0000370[1] |
| Helio radial velocity | 4,579±11 km/s[1] |
| Distance | 217.00 ± 17.56 Mly (66.533 ± 5.384 Mpc)[1] |
| Group or cluster | NGC 945 group (LGG 63) |
| Apparent magnitude (V) | 13.5[1] |
| Characteristics | |
| Type | (R')SAB(r)a[1] |
| Size | ~126,300 ly (38.71 kpc) (estimated)[1] |
| Apparent size (V) | 1.9′ × 1.6′[1] |
| Other designations | |
| MCG-02-07-031, PGC 9713[1] | |
NGC 977 is a intermediate spiral galaxy in the constellation of Cetus. Its velocity with respect to the cosmic microwave background is 4,356±19 km/s, which corresponds to a Hubble distance of 209.6 ± 14.7 Mly (64.25 ± 4.51 Mpc).[1] Additionally, six non-redshift measurements give a similar mean distance of 217.00 ± 17.56 Mly (66.533 ± 5.384 Mpc).[2] It was discovered by German-British astronomer William Herschel on 28 November 1785.[3][4]
NGC 977 is 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.[5][6]
NGC 945 group
NGC 977 is a member of the NGC 945 group (also known as LGG 63), which contains at least seven galaxies. The other members of the group are NGC 945, NGC 948, NGC 950, MCG -02-07-020, MCG -02-07-032, and MCG -02-07-033.[7][8]
Supernova
One supernova has been observed in NGC 977:
- SN 1976J (type unknown, mag. 15.5) was discovered by Italian astronomer Leonida Rosino on 15 December 1976.[9][10] Although it was never officially classfied, its light curve suggested that it was a Type I supernova.[11]
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 0977". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+0977.
- ↑ "Distance Results for NGC 0977". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+0977.
- ↑ Herschel, William (1789). "Catalogue of a Second Thousand of New Nebulae and Clusters of Stars; with a Few Introductory Remarks on the Construction of the Heavens". Philosophical Transactions of the Royal Society of London 79: 212–255. doi:10.1098/rstl.1789.0021. Bibcode: 1789RSPT...79..212H.
- ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 977". https://cseligman.com/text/atlas/ngc9a.htm#977.
- ↑ Chen, Yan-Ping; Zaw, Ingyin; Farrar, Glennys R.; Elgamal, Sana (2022). "A Uniformly Selected, Southern-sky 6dF, Optical AGN Catalog". The Astrophysical Journal Supplement Series 258 (2): 29. doi:10.3847/1538-4365/ac4157. Bibcode: 2022ApJS..258...29C.
- ↑ "NGC 977". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+977.
- ↑ "LGG 63". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=LGG+63.
- ↑ 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.
- ↑ Rosino, L. (1976). "Supernova in NGC 977". International Astronomical Union Circular (3021): 1. Bibcode: 1976IAUC.3021....1R. http://www.cbat.eps.harvard.edu/iauc/03000/03021.html#Item1.
- ↑ "SN 1976J". IAU. https://www.wis-tns.org/object/1976J.
- ↑ Wegner, G. (1979). "Photometry of the supernovae in NGC 488 and NGC 977". The Astronomical Journal 84: 502. doi:10.1086/112442. Bibcode: 1979AJ.....84..502W.
External links
- NGC 977 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
02h 33m 03.4241s, −10° 45′ 35.544″
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