NGC 2442 and NGC 2443

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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)
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 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]

Contents

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, also known as AT 2016jbu, [9] [10] 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. [11]

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References

  1. ↑ NGC/IC Project Restoration Effortngcicproject.observers.org
  2. 1 2 3 4 5 6 7 "NASA/IPAC Extragalactic Database". Results for NGC 2442 / 2443. Retrieved 2023-02-08.
  3. ↑ Chadwick, S; Cooper, I (11 December 2012). Imaging the Southern Sky. New York: Springer. p. 263. ISBN   978-1461447498.
  4. 1 2 Seligman, Courtney. "Celestial Atlas: NGC Objects: NGC 2400 - 2449". cseligman.com. Archived from the original on 9 September 2015. Retrieved 10 July 2015.
  5. 1 2 Ryder, S.D.; et al. (July 2001). "HIPASS Detection of an Intergalactic Gas Cloud in the NGC 2442 Group". The Astrophysical Journal. 555 (1): 232–239. arXiv: astro-ph/0103099 . Bibcode:2001ApJ...555..232R. doi:10.1086/321453. S2CID   14455875.
  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. ↑ "AT 2016jbu". Transient Name Server. IAU . Retrieved 31 August 2024.
  10. ↑ Fox, Derek (4 January 2017). "PESSTO classification and characterisation of AT 2016jbu / Gaia16cfr". The Astronomer's Telegram. Retrieved 31 August 2024.
  11. ↑ Kilpatrick, Charles D.; Foley, Ryan J.; Drout, Maria R.; Pan, Yen-Chen; Panther, Fiona H.; Coulter, David A.; Filippenko, Alexei V.; Marion, G. Howard; Piro, Anthony L.; Rest, Armin; Seitenzahl, Ivo R.; Strampelli, Giovanni; Wang, Xi E. (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. arXiv: 1706.09962 . Bibcode:2018MNRAS.473.4805K. doi: 10.1093/mnras/stx2675 .


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