NGC 2442 / 2443 | |
---|---|
![]() NGC 2442 (upper spiral structure) and NGC 2443 (lower horizontal spiral arm)
[1] | |
Observation data ( J2000 epoch) | |
Constellation | Volans |
Right ascension | 07h 36m 23.8s [2] |
Declination | −69° 31′ 51″ [2] |
Redshift | 1466 ± 5 km/ s [2] |
Apparent magnitude (V) | 11.2 [2] |
Characteristics | |
Type | SAB(s)bc pec [2] |
Apparent size (V) | 5′.5 × 4′.9 [2] |
Notable features | SW part is NGC 2442 while NE part is NGC 2443 |
Other designations | |
PGC 21373 [2] |
NGC 2442 and NGC 2443 are two parts of a single intermediate spiral galaxy, commonly known as the Meathook Galaxy or the Cobra and Mouse. [3] It is about 50 million light-years away in the constellation Volans. It was discovered by Sir John Herschel on December 23, 1834 during his survey of southern skies with a 18.25 inch diameter reflecting telescope (his "20-foot telescope") from an observatory he set up in Cape 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]
When John Louis Emil Dreyer compiled the New 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] [6]
Two supernovae have been observed in NGC 2442: SN 1999ga ( type II, mag. 18), [7] and SN 2015F ( type Ia, mag. 16.8). [8]
Gaia16cfr was a supernova imposter that occurred in NGC 2442 on 1 December 2016. It reached a Gaia apparent magnitude of 19.3 and absolute magnitude of about −12. [9]
NGC 2442 / 2443 | |
---|---|
![]() NGC 2442 (upper spiral structure) and NGC 2443 (lower horizontal spiral arm)
[1] | |
Observation data ( J2000 epoch) | |
Constellation | Volans |
Right ascension | 07h 36m 23.8s [2] |
Declination | −69° 31′ 51″ [2] |
Redshift | 1466 ± 5 km/ s [2] |
Apparent magnitude (V) | 11.2 [2] |
Characteristics | |
Type | SAB(s)bc pec [2] |
Apparent size (V) | 5′.5 × 4′.9 [2] |
Notable features | SW part is NGC 2442 while NE part is NGC 2443 |
Other designations | |
PGC 21373 [2] |
NGC 2442 and NGC 2443 are two parts of a single intermediate spiral galaxy, commonly known as the Meathook Galaxy or the Cobra and Mouse. [3] It is about 50 million light-years away in the constellation Volans. It was discovered by Sir John Herschel on December 23, 1834 during his survey of southern skies with a 18.25 inch diameter reflecting telescope (his "20-foot telescope") from an observatory he set up in Cape 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]
When John Louis Emil Dreyer compiled the New 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] [6]
Two supernovae have been observed in NGC 2442: SN 1999ga ( type II, mag. 18), [7] and SN 2015F ( type Ia, mag. 16.8). [8]
Gaia16cfr was a supernova imposter that occurred in NGC 2442 on 1 December 2016. It reached a Gaia apparent magnitude of 19.3 and absolute magnitude of about −12. [9]