NGC 772

NGC 772
NGC 772 imaged by the Gemini Observatory [1]
Observation data (J2000 epoch)
Constellation	Aries
Right ascension	01h 59m 19.5443s [2]
Declination	+19° 00′ 27.751″ [2]
Redshift	0.008236 [2]
Heliocentric radial velocity	2469 ± 2 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]
Size	~204,000  ly (62.56  kpc) (estimated) [2]
Apparent size  (V)	7.2′ × 4.3′ [2]
Other designations
IRAS 01565+1845, Arp 78, UGC 1466, MCG +03-06-011, PGC 7525, CGCG 461-018 [2]

NGC 772 (also known as Arp 78 or the Fiddlehead Galaxy ^[3] ) is a large unbarred spiral galaxy approximately 106 million light-years away in the constellation Aries. It was discovered by German-British astronomer William Herschel on 29 November 1785. ^{[4] [5]}

Characteristics

At around 200,000 light years in diameter, NGC 772 is somewhat larger than the Milky Way Galaxy, ^[6] 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".

NGC 772 probably has a H II nucleus, but it may be a transitional object. ^[7]

Supernovae

Two supernovae in the galaxy (SN 2003hl & 2003iq) and asteroid 6223 Dahl passing through the shot

Three supernovae have been observed in NGC 772:

• SN 2003hl (Type II, mag. 16.5) was discovered by LOTOSS (Lick Observatory and Tenagra Observatory Supernova Searches) on 20 August 2003. ^{[8] [9]}
• SN 2003iq (Type II, mag. 16.4) was discovered by Jean-Marie Llapasset on 8 October 2003. ^{[10] [11] [12]} This supernova was visible at the same time as SN 2003hl, which was discovered 7 weeks prior. ^[13]
• SN 2022qze (Type II-P, mag. 19.89) was discovered by Pan-STARRS on 8 August 2022. ^[14]

Gallery

• 
  RGB image of the galaxy NGC 772 and dwarf galaxy NGC 770 (top center) interacting, from the Liverpool Telescope
• 
  Center of the galaxy imaged by the Hubble Space Telescope. ^[15]

See also

• NGC 1097
• Whirlpool Galaxy

References

1. "Strong-Arming a Galaxy". NOIRLab. Retrieved 30 January 2023.
2. "Results for object NGC 0772". NASA/IPAC Extragalactic Database. NASA and Caltech . 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. Herschel, W. (1789). "Catalogue of a Second Thousand of New Nebulae and Clusters of Stars; with a Few Introductory Remarks on the Construction of the Heavens". Philosophical Transactions of the Royal Society of London . 79: 212–255. Bibcode:1789RSPT...79..212H. doi: 10.1098/rstl.1789.0021 .
5. Seligman, Courtney. "NGC 772". Celestial Atlas. Retrieved 17 August 2024.
6. 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.
7. 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.
8. Moore, M.; Li, W.; Boles, T. (2003). "Supernovae 2003hg, 2003hh, 2003hi, 2003hj, 2003hk, 2003hl". International Astronomical Union Circular (8184): 2. Bibcode:2003IAUC.8184....2M.
9. "SN 2003hl". Transient Name Server. IAU . Retrieved 14 December 2024.
10. Yamaoka, H.; Ayani, K. (2003). "Supernovae 2003hl and 2003iq in NGC 772". International Astronomical Union Circular (8219): 2. Bibcode:2003IAUC.8219....2Y.
11. "NGC 772, Supernovae 2003hl and 2003iq". www.kopernik.org. Retrieved 2022-04-08.
12. "SN 2003iq". Transient Name Server. IAU . Retrieved 14 December 2024.
13. Bishop, David. "Supernovae 2003hl and 2003iq in NGC 772". Rochester Astronomy. Retrieved 14 December 2024.
14. "SN 2022qze". Transient Name Server. IAU . Retrieved 14 December 2024.
15. "A Rival to the Milky Way". ESA Hubble. Retrieved 11 November 2019.

External links

• Spiral Galaxy NGC 772; Elliptical Galaxy NGC 770
• NGC 772 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
• NGC 772 (Arp 78) at Constellation Guide