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Hoag's Object
| Hoag's Object | |
|---|---|
 Hoag's Object, taken by the Hubble Space Telescope in July 2001 | |
| Observation data (J2000 epoch) | |
| Constellation | Serpens Caput |
| Right ascension | 15h 17m 14.4s[1] |
| Declination | +21° 35′ 08″[1] |
| Redshift | 12740±50 km/s[1][2] |
| Distance | 612.8±9.4 Mly (187.9±2.9 Mpc)[2][a] |
| Apparent magnitude (B) | 16.2[1] |
| Characteristics | |
| Type | (RP)E0 or (RP)SA0/a[3] |
| Size | 45.41 kiloparsecs (148,000 light-years)[1][4] (diameter; D25 isophote) |
| Apparent size (V) | 0.28′ × 0.28′[1] |
| Notable features | Ring galaxy |
| Other designations | |
| PGC 54559,[1] PRC D-51[1] | |
Hoag's Object is an unusual ring galaxy in the constellation of Serpens Caput.[5] It is named after Arthur Hoag, who discovered it in 1950 and identified it as either a planetary nebula or a peculiar galaxy.[6] The galaxy has a D25 isophotal diameter of 45.41 kiloparsecs (148,000 light-years).[1]
- ^ a b c d e f g h i "NED results for Hoag's Object". NASA/IPAC Extragalactic Database. Retrieved 2016-06-28.
- ^ a b Cite error: The named reference
OConnelletal1974was invoked but never defined (see the help page). - ^ Buta, Ronald J. (2017). "Galactic rings revisited – I. CVRHS classifications of 3962 ringed galaxies from the Galaxy Zoo 2 Database". Monthly Notices of the Royal Astronomical Society. 471 (4): 4027–4046. arXiv:1707.06589. Bibcode:2017MNRAS.471.4027B. doi:10.1093/mnras/stx1829.
- ^ Adelman-Mccarthy, Jennifer K.; et al. (2008). "The Sixth Data Release of the Sloan Digital Sky Survey". The Astrophysical Journal Supplement Series. 175 (2): 297–313. arXiv:0707.3413. Bibcode:2008ApJS..175..297A. doi:10.1086/524984.
- ^ Specktor, Brandon (3 December 2019). "Hoag's Object Is a Galaxy Within a Galaxy Within a Galaxy (and Nobody Knows Why)". Live Science. Retrieved 3 December 2019.
- ^ Hoag, Arthur A. (1950). "A peculiar object in Serpens". The Astronomical Journal. 55: 170. Bibcode:1950AJ.....55Q.170H. doi:10.1086/106427.
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