| NGC 247 | |
|---|---|
) | |
| Observation data (J2000 epoch) | |
| Constellation | Cetus |
| Right ascension | 00h 47m 08.5s[1] |
| Declination | −20° 45′ 37″[1] |
| Distance | 11.1 ± 1.2 Mly |
| Apparent magnitude (V) | 9.9[1] |
| Characteristics | |
| Type | SAB(s)d[1] |
| Apparent size (V) | 21′.4 × 6′.9[1] (70,000 light-years in diameter) |
| Other designations | |
| HIPASS J0047-20, LEDA 2758, ESO-LV 540-0220, IRAS F00446-2101, 2MASX J00470855-2045374, ESO 540-22, IRAS 00446-2101, MCG-04-03-005, GLXY G113.8-83.5+144, KUG 0044-210, UGCA 11, PGC 2758,[1] Caldwell 62 | |
)
NGC 247 (also known as Caldwell 62) is an intermediate spiral galaxy (although it is sometimes classified as a dwarf spiral galaxy) about 11.1 Mly away in the constellation Cetus. This distance was confirmed in late February 2011. Previous measurements showed that the galaxy was about 12.2 Mly away, but this was proved to be wrong.[3] NGC 247 is a member of the Sculptor Group, and has got 70 000 light years in diameter. [4]
NGC 247 has an unusually large void on one side of its spiral disk. This void contains some older, redder stars but no younger, bluer stars.[5]
Nearby galaxies and galaxy group information
NGC 247 is one of several galaxies that is gravitationally bound to the Sculptor Galaxy (NGC 253). These galaxies form a small core in the center of the Sculptor Group, which is one of the nearest groups of galaxies to the Milky Way.[6] Most other galaxies associated with the Sculptor Group are only weakly gravitationally bound to this core.[6][7]
References
- ^ a b c d e f "NASA/IPAC Extragalactic Database". Results for NGC 247. Retrieved 2006-12-19.
- ^ "The centre of NGC 247". www.spacetelescope.org. Retrieved 6 October 2016.
- ^ The news regarding the distance error
- ^ "NGC 247, an intermediate spiral galaxy in Cetus". Anne's Astronomy News (in Dutch). 2013-12-05. Retrieved 2020-04-16.
- ^ Wagner-Kaiser, R.; Demaio, T.; Sarajedini, A.; Chakrabarti, S. (2014). "The Void in the Sculptor Group Spiral Galaxy NGC 247". Monthly Notices of the Royal Astronomical Society. 443 (4): 3260–3269. arXiv:1407.0584. Bibcode:2014MNRAS.443.3260W. doi:10.1093/mnras/stu1327.
- ^ a b Karachentsev, I. D. (2005). "The Local Group and Other Neighboring Galaxy Groups". Astronomical Journal. 129 (1): 178–188. arXiv:astro-ph/0410065. Bibcode:2005AJ....129..178K. doi:10.1086/426368.
- ^ Karachentsev, I. D.; Grebel, E. K.; Sharina, M. E.; Dolphin, A. E.; Geisler, D.; Guhathakrta, P.; Hodge, P. W.; Karachentseva, V. E.; Sarajedini, A.; Seitzer, P. (2003). "Distances to nearby galaxies in Sculptor". Astronomy and Astrophysics. 404 (1): 93–111. arXiv:astro-ph/0302045. Bibcode:2003A&A...404...93K. doi:10.1051/0004-6361:20030170.
External links
Media related to NGC 247 at Wikimedia Commons- NGC 247 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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