NGC 2442 andNGC 2443 are two parts of a singleintermediate spiral galaxy, commonly known as theMeathook Galaxy or theCobra and Mouse.[3] It is about 50 millionlight-years away in theconstellationVolans. It was discovered by SirJohn Herschel on December 23, 1834 during his survey of southern skies with a 18.25 inch diameterreflecting telescope (his "20-foot telescope") from an observatory he set up inCape Town, South Africa.[4] Associated with this galaxy is HIPASS J0731-69, a cloud of gas devoid of any stars.[5] It is likely that the cloud was torn loose from NGC 2442 by a companion.[5]
WhenJohn Louis Emil Dreyer compiled theNew General Catalogue of Nebulae and Clusters of Stars he used William Herschel's earlier observations that described two objects in a "double nebula", giving the northern most the designation NGC 2443 and the southernmost most the designation NGC 2442. Herschel's later observations noted that the two objects were actually a single large nebula.[4][1]
Two, or perhaps three,supernovae have been observed in NGC 2442:
SN 1999ga (Type II, mag. 18) was discovered by the Perth Astronomical Research Group on 19 November 1999.[6][7]
SN 2015F (Type Ia, mag. 16.8) was discovered byBerto Monard [it] on 9 March 2015.[8][9] It reached magnitude 12.9, making it the brightest supernova of 2015.[10]
Gaia16cfr, also known as AT 2016jbu,[11][12] was asupernova imposter that occurred in NGC 2442 on 1 December 2016. It reached a Gaiaapparent magnitude of 19.3 andabsolute magnitude of about −12.[13] However, a paper published in August 2022 suggested that this was a genuine, but strange, supernova.[14]
^"SN1999ga".Transient Name Server.IAU. Retrieved9 December 2024.
^Monard, L. A. G.; Fraser, M.; Smith, M.; Firth, R.; Dimitriadis, G.; Frohmaier, C.; Cartier, R.; Prajs, S.; Sullivan, M.; Anderson, J.; Maguire, K.; Inserra, C.; Smartt, S. J.; Smith, K. W.; Young, D.; Valenti, S.; Yaron, O.; Manulis, I. (2015). "Supernova 2015F in NGC 2442 = PSN J07361576-6930230".Central Bureau Electronic Telegrams (4081): 1.Bibcode:2015CBET.4081....1M.
^"SN2015F".Transient Name Server.IAU. Retrieved9 December 2024.
