Astronomy:NGC 254
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Short description: Galaxy in the constellation of Sculptor
| NGC 254 | |
|---|---|
 DECam image of NGC 254 | |
| Observation data (J2000 epoch) | |
| Constellation | Sculptor |
| Right ascension | 00h 47m 27.595s[1] |
| Declination | −31° 25′ 18.11″[1] |
| Redshift | 0.005434[2] |
| Helio radial velocity | 1629[2] |
| Distance | 55.8 Mly (17.10 Mpc)[2] |
| Apparent magnitude (V) | 11.82[1] |
| Apparent magnitude (B) | 11.62[1] |
| Characteristics | |
| Type | (R)SA(rl)0+[3] |
| Apparent size (V) | 2.6′ × 1.7′[4] |
| Other designations | |
| MCG-05-03-005, PGC 2778 | |
NGC 254 is a lenticular galaxy located in the constellation Sculptor. It was discovered by John Herschel in 1834.[4] It is in a galaxy group with NGC 134.[3]
NGC 254 is an example of a ring galaxy, a galaxy with a ring,[3] and in this case, no central bar. Across the entire galaxy disk, there is a disk of ionized gas rotating in the direction opposite the stellar disk's rotation.[3] This situation may have arose when a retrograde-orbiting satellite galaxy accreted onto the galaxy itself, some 1 billion years ago.[3]
See also
References
- ↑ 1.0 1.1 1.2 1.3 "NGC 254". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+254.
- ↑ 2.0 2.1 2.2 "NASA/IPAC Extragalactic Database". Results for NGC 254. http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+254&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES.
- ↑ 3.0 3.1 3.2 3.3 3.4 Katkov, Ivan Yu.; Kniazev, Alexei Yu.; Sil'Chenko, Olga K.; Gasymov, Damir (2022). "Star formation in outer rings of S0 galaxies. IV. NGC 254: A double-ringed S0 with gas counter-rotation". Astronomy & Astrophysics 658: A154. doi:10.1051/0004-6361/202141934. Bibcode: 2022A&A...658A.154K.
- ↑ 4.0 4.1 "New General Catalog Objects: NGC 250 - 299". http://cseligman.com/text/atlas/ngc2a.htm#254.
External links
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