NGC 772

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NGC 772
NGC772 SN2003hl SN2003iq 6223 Dahl.jpg
Spiral Galaxy NGC 772 with two supernova (SN 2003hl & 2003iq) and asteroid 6223 Dahl
Observation data (J2000 epoch)
Constellation Aries
Right ascension 01h 59m 19.6s[1]
Declination +19° 00′ 27″[1]
Redshift 2472 ± 3 km/s[1]
Distance 130 Mly[citation needed]
Apparent magnitude (V) 11.1[1]
Characteristics
Type SA(s)b[1]
Apparent size (V) 7′.2 × 4′.3[1]
Other designations
UGC 1466,[1] PGC 7525,[1] Arp 78[1]
See also: Galaxy, List of galaxies

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

Characteristics[edit]

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]

Gallery[edit]

See also[edit]

References[edit]

  1. ^ a b c d e f g h i "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. Bibcode:1997ApJS..112..315H. arXiv:astro-ph/9704107Freely accessible. doi:10.1086/313041. 

External links[edit]


Coordinates: Sky map 01h 59m 19.6s, +19° 00′ 27″