Arp 240

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Arp 240
Hubble Interacting Galaxy NGC 5257 (2008-04-24).jpg
Arp 240. The two galaxies are NGC 5257 (right) and NGC 5258 (left).
Observation data (J2000 epoch)
Constellation Virgo
Right ascension Right: 13h 39m 52.3s[1]
Left: 13h 39m 57.7s[2]
Declination Right: +00° 50′ 22″[1]
Left: +00° 49′ 51″[2]
Redshift Right: 6798 ± 9 km/s[1]
Left: 6757 ± 1 km/s[2]
Distance Right: 345.1 Mly
(105.8 Mpc)[3]
Left: 342.1 Mly
(104.9 Mpc)[3]
Apparent magnitude (V) 12.9 / 12.9[1][2]
Type Right: SAB(s)b pec[1]
Left: SA(s)b pec[2]
Apparent size (V) Right: 1.8′ × 0.9′[1]Left: 1.7′ × 1.1′[1]
Notable features Interacting galaxies
Other designations
Right: NGC 5257, UGC 8641, PGC 48330, VV 55b[1]
Left: NGC 5258, UGC 8645, PGC 48338, VV 55a[1]
See also: Galaxy, List of galaxies

Arp 240 is a pair of interacting spiral galaxy located in the constellation Virgo. The two galaxies are listed together as Arp 240 in the Atlas of Peculiar Galaxies.[4] The galaxy on the right is known as NGC 5257, while the galaxy on the left is known as NGC 5258. Both galaxies are distorted by the gravitational interaction, and both are connected by a tidal bridge, as can be seen in images of these galaxies.


  1. ^ a b c d e f g h i "NASA/IPAC Extragalactic Database". Results for NGC 5257. Retrieved 2006-11-22.
  2. ^ a b c d e "NASA/IPAC Extragalactic Database". Results for NGC 5258. Retrieved 2006-11-22.
  3. ^ a b Mould, Jeremy R. (2000). "The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant". The Astrophysical Journal. 529 (2): 786–794. arXiv:astro-ph/9909260. Bibcode:2000ApJ...529..786M. doi:10.1086/308304.
  4. ^ H. Arp (1966). "Atlas of Peculiar Galaxies". Astrophysical Journal Supplement. 14: 1–20. Bibcode:1966ApJS...14....1A. doi:10.1086/190147.