NGC 772

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NGC 772
NGC772 - Noirlab2209a.jpg
NGC 772 imaged by the Gemini Observatory [1]
Observation data (J2000 epoch)
Constellation Aries
Right ascension 01h 59m 19.6s [2]
Declination +19° 00′ 27.1″ [2]
Redshift 2472 ± 3 km/s [2]
Distance 105.7 ± 7.5  Mly (32.42 ± 2.29  Mpc) [2]
Apparent magnitude  (V)11.1 [2]
Characteristics
Type SA(s)b [2]
Apparent size  (V)7.2′ × 4.3′ [2]
Other designations
UGC 1466, [2] PGC 7525, [2] Arp 78 [2]

NGC 772 (also known as Arp 78 or the Fiddlehead Galaxy [3] ) is an unbarred spiral galaxy approximately 106 million light-years away in the constellation Aries. It was discovered on 29 November 1785 by German-British astronomer William Herschel. [4]

Contents

Characteristics

At around 200,000 light years in diameter, NGC 772 is somewhat larger than the Milky Way Galaxy, [5] and is surrounded by several satellite galaxies – including the dwarf elliptical, NGC 770 – whose tidal forces on the larger galaxy have likely caused the emergence of a single elongated outer spiral arm that is much more developed and stronger than the others arms. Halton Arp includes NGC 772 in his Atlas of Peculiar Galaxies as Arp 78 , where it is described as a "Spiral galaxy with a small high-surface brightness companion".

Three supernovae have been observed in NGC 772. SN 2003hl (Type II, mag. 16.5) [6] was discovered on 20 August 2003. SN 2003iq (Type II, mag. 16.4) [7] was discovered on 8 October 2003. [8] SN 2022qze (type IIP, mag. 19.9) was discovered on 8 August 2022. [9]

NGC 772 probably has a H II nucleus, but it may be a transitional object. [10]

See also

Related Research Articles

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References

  1. ↑ "Strong-Arming a Galaxy". NOIRLab. Retrieved 30 January 2023.
  2. 1 2 3 4 5 6 7 8 9 10 "NASA/IPAC Extragalactic Database". Results for NGC 772. Retrieved 2006-11-25.
  3. ↑ Stoyan, Ronald; Schurig, Stephan (2014). interstellarum Deep Sky Atlas. Erlangen: Cambridge University Press; Oculum-Verlag GmbH. ISBN   978-1-107-50338-0. OCLC   920437579.
  4. ↑ Seligman, Courtney. "NGC 772". Celestial Atlas. Retrieved 17 August 2024.
  5. ↑ Rhee, M. H.; van Albada, T. S. (February 1996). "Short WSRT HI observations of spiral galaxies". Astronomy and Astrophysics Supplement. 115: 407–437. Bibcode:1996A&AS..115..407R.
  6. ↑ Transient Name Server entry for SN 2003hl. Retrieved 25 March 2023.
  7. ↑ Transient Name Server entry for SN 2003iq. Retrieved 25 March 2023.
  8. ↑ "NGC 772, Supernovae 2003hl and 2003iq". www.kopernik.org. Retrieved 2022-04-08.
  9. ↑ Transient Name Server entry for SN 2022qze. Retrieved 25 March 2023.
  10. ↑ Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. (October 1997). "A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies". Astrophysical Journal Supplement. 112 (2): 315–390. arXiv: astro-ph/9704107 . Bibcode:1997ApJS..112..315H. doi:10.1086/313041. S2CID   17086638.
  11. ↑ "A Rival to the Milky Way". ESA Hubble. Retrieved 11 November 2019.
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