Astronomy:NGC 2442 and NGC 2443

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Short description: Spiral galaxy in the constellation Volans
NGC 2442 / 2443
Ngc2442 wide field cropped.jpg
NGC 2442 (upper spiral structure) and NGC 2443 (lower horizontal spiral arm)[1]
Observation data (J2000 epoch)
ConstellationVolans
Right ascension 07h 36m 23.8s[2]
Declination−69° 31′ 51″[2]
Redshift1466 ± 5 km/s[2]
Apparent magnitude (V)11.2[2]
Characteristics
TypeSAB(s)bc pec[2]
Apparent size (V)5′.5 × 4′.9[2]
Notable featuresSW 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]

Supernovae

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]

References

  1. NGC/IC Project Restoration Effortngcicproject.observers.org
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 "NASA/IPAC Extragalactic Database". Results for NGC 2442 / 2443. http://ned.ipac.caltech.edu/byname?objname=NGC+2442. 
  3. Chadwick, S; Cooper, I (11 December 2012). Imaging the Southern Sky. New York: Springer. p. 263. ISBN 978-1461447498. 
  4. 4.0 4.1 Seligman, Courtney. "Celestial Atlas: NGC Objects: NGC 2400 - 2449". http://cseligman.com/text/atlas/ngc24.htm#2443. 
  5. 5.0 5.1 Ryder, S.D. (July 2001). "HIPASS Detection of an Intergalactic Gas Cloud in the NGC 2442 Group". The Astrophysical Journal 555 (1): 232–239. doi:10.1086/321453. Bibcode2001ApJ...555..232R. 
  6. NGC/IC Project Restoration Effortngcicproject.observers.org
  7. Transient Name Server entry for SN 1999ga. Retrieved 31 March 2023.
  8. Transient Name Server entry for SN 2015F. Retrieved 31 March 2023.
  9. Kilpatrick, Charles D.; Foley, Ryan J.; Drout, Maria R.; Pan, Yen-Chen; Panther, Fiona H.; Coulter, David A.; Filippenko, Alexei V.; Marion, G. Howard et al. (2018). "Connecting the progenitors, pre-explosion variability and giant outbursts of luminous blue variables with Gaia16cfr". Monthly Notices of the Royal Astronomical Society 473 (4): 4805. doi:10.1093/mnras/stx2675. Bibcode2018MNRAS.473.4805K. 

External links

Coordinates: Sky map 07h 36m 23.8s, −69° 31′ 51″