Astronomy:NGC 888
From HandWiki
| NGC 888 | |
|---|---|
 NGC 888 imaged by Legacy Surveys | |
| Observation data (J2000 epoch) | |
| Constellation | Horologium |
| Right ascension | 02h 17m 27.1s[1] |
| Declination | −59° 51′ 40″[1] |
| Redshift | 0.029190±0.000133[1] |
| Helio radial velocity | 8,751±40 km/s[1] |
| Galactocentric velocity | 8662±40 km/s[1] |
| Distance | 416.7 ± 29.2 Mly (127.76 ± 8.96 Mpc)[1] |
| Apparent magnitude (V) | 13.0[2] |
| Apparent magnitude (B) | 14.0[2] |
| Characteristics | |
| Type | E1? pec[1] · [2] E/S0?[3] E[4] |
| Apparent size (V) | 0.8′ × 0.8′[2] |
| Notable features | Flat-spectrum radio source[1] |
| Other designations | |
| PGC 8743 ESO 115-2 AM 0215-600[2] | |
NGC 888 is a large and relatively distant elliptical galaxy in the constellation Horologium. Its velocity relative to the cosmic microwave background is 8662±40 km/s, corresponding to a Hubble distance of 127.8±9.0 Mpc.[1] It was discovered by British astronomer John Herschel in 1834.[3]
Characteristics
A redshift-independent distance measurement gives 136.0 Mpc,[5] which is consistent within uncertainties with the Hubble distance.
NGC 888 is classified as a flat-spectrum radio galaxy.[1]
Galaxy pair
NGC 888 and ESO 115-003 form a galaxy pair.[6] The Hubble distance of ESO 115-003 is 134.65±9.45 Mpc.[7] Considering the uncertainties in the distances, it is possible that the two galaxies form a physical pair.
Supernova
One supernova has been observed in NGC 888:
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 "Results for object NGC 888". http://ned.ipac.caltech.edu/byname?objname=NGC+888.
- ↑ 2.0 2.1 2.2 2.3 2.4 "Revised NGC and IC Catalog by Wolfgang Steinicke, NGC 800–899". https://astrovalleyfield.com/AstronomieCompl/NGC%20et%20autres/WolfgangS/N0800_exc_web.htm.
- ↑ 3.0 3.1 Courtney Seligman. "Celestial Atlas – NGC 888". http://cseligman.com/text/atlas/ngc8a.htm#888.
- ↑ "NGC 888 on HyperLeda". http://leda.univ-lyon1.fr/ledacat.cgi?o=NGC%200888.
- ↑ "Your NED Search Results. Distance Results for NGC 888". https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+888.
- ↑ Soares, D. S. L.; de Souza, R. E.; de Carvalho, R. R.; Couto da Silva, T. C. (1995). "Southern binary galaxies. I. A sample of isolated pairs". Astronomy and Astrophysics Supplement 110: 371. doi:10.48550/arXiv.astro-ph/9410092.
- ↑ "Results for object ESO 115-G 003". https://ned.ipac.caltech.edu/byname?objname=ESO+115-G+003.
- ↑ Shumkov, V.; Lipunov, V.; Buckley, D.; Podesta, R.; Levato, H.; Gorbovskoy, E.; Tyurina, N.; Balanutsa, P. et al. (2016). "MASTER: Bright PSN in NGC 0888". The Astronomer's Telegram 9396: 1. Bibcode: 2016ATel.9396....1S. https://www.astronomerstelegram.org/?read=9396.
- ↑ "SN 2016frs". IAU. https://www.wis-tns.org/object/2016frs.
External links
- NGC 888 sur spider.seds.org
- NGC 888 sur la base de données LEDA
- NGC 888 sur WikiSky
- NGC 888 sur le site du professeur C. Seligman
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