NGC 772

NGC 772 (also known as Arp 78) is an unbarred spiral galaxy approximately 130 million light-years away in the constellation Aries.

NGC 772
RGB image of the galaxy NGC 772 and dwarf galaxy NGC 770 (top center) interacting, from the Liverpool Telescope
Observation data (J2000 epoch)
ConstellationAries
Right ascension 01h 59m 19.6s[1]
Declination+19° 00′ 27″[1]
Redshift2472 ± 3 km/s[1]
Distance130 Mly
Apparent magnitude (V)11.1[1]
Characteristics
TypeSA(s)b[1]
Apparent size (V)7′.2 × 4′.3[1]
Other designations
UGC 1466,[1] PGC 7525,[1] Arp 78[1]

Characteristics

Around 200,000 light years in diameter, NGC 772 is twice the size of the Milky Way Galaxy,[2] 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 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".

Two supernovae (SN 2003 hl & SN 2003 iq) have been observed in NGC 772.

NGC 772 probably has a H II nucleus, but it may be a transitional object.[3]

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See also

References
  1. "NASA/IPAC Extragalactic Database". Results for NGC 772. Retrieved 2006-11-25.
  2. 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.
  3. 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.
  4. "A Rival to the Milky Way". www.spacetelescope.org. Retrieved 11 November 2019.


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