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 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]

Related Research Articles

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<span class="mw-page-title-main">Volans</span> Constellation in the southern celestial hemisphere

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<span class="mw-page-title-main">Cygnus Loop</span>

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NGC 2397 is a flocculent spiral galaxy located in the southern Volans constellation, about one degree to the SSE of Delta Volantis. English astronomer John Herschel discovered the galaxy on February 21, 1835. It is located at a distance of approximately 69 million light years from the Sun, and is a member of the small NGC 2442 group that includes NGC 2434.

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<span class="mw-page-title-main">NGC 908</span> Unbarred spiral galaxy in the constellation Cetus

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<span class="mw-page-title-main">NGC 1448</span> Unbarred spiral galaxy in the constellation Horologium

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<span class="mw-page-title-main">NGC 1961</span> Galaxy in the constellation Camelopardis

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<span class="mw-page-title-main">NGC 1255</span> Galaxy in the constellation Fornax

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<span class="mw-page-title-main">NGC 2336</span> Galaxy in the constellation Camelopardalis

NGC 2336 is a Barred spiral galaxy located in the constellation Camelopardalis. It is located at a distance of circa 100 million light years from Earth, which, given its apparent dimensions, means that NGC 2336 is about 200,000 light years across. It was discovered by Wilhelm Tempel in 1876.

<span class="mw-page-title-main">NGC 1325</span> Flocculent barred spiral galaxy in the constellation Eridanus

NGC 1325 is a flocculent spiral galaxy situated in the constellation of Eridanus. Located about 75 million light years away, it is a member of the Eridanus cluster of galaxies, a cluster of about 200 galaxies. It was discovered by William Herschel on 19 December 1799.

<span class="mw-page-title-main">NGC 5004</span> Lenticular galaxy in constellation Coma Berenices

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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. 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.