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Arp 240

From Wikipedia, the free encyclopedia
(Redirected from NGC 5258)
Arp 240
Arp 240. The two galaxies are NGC 5257 (right) and NGC 5258 (left).
Observation data (J2000 epoch)
ConstellationVirgo
Right ascensionRight: 13h 39m 52.3s[1]
Left: 13h 39m 57.7s[2]
DeclinationRight: +00° 50′ 22″[1]
Left: +00° 49′ 51″[2]
RedshiftRight: 6798 ± 9 km/s[1]
Left: 6757 ± 1 km/s[2]
DistanceRight: 345.1 Mly
(105.8 Mpc)[3]
Left: 342.1 Mly
(104.9 Mpc)[3]
Apparent magnitude (V)12.9 / 12.9[1][2]
Characteristics
TypeRight: 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 featuresInteracting galaxies
Other designations
Right: NGC 5257, UGC 8641, PGC 48330, VV 55b[1]
Left: NGC 5258, UGC 8645, PGC 48338, VV 55a[1]
The location of Arp 240 (circled in red)

Arp 240 is a pair of interacting spiral galaxies 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.

Supernova

[edit]

One supernova has been observed in NGC 5258:

  • SN 2020dko (Type Ia, mag. 19.1517) was discovered by the Automatic Learning for the Rapid Classification of Events (ALeRCE) on 25 February 2020.[5]

References

[edit]
  1. 1 2 3 4 5 6 7 8 9 "NASA/IPAC Extragalactic Database". Results for NGC 5257. Retrieved 2006-11-22.
  2. 1 2 3 4 5 "NASA/IPAC Extragalactic Database". Results for NGC 5258. Retrieved 2006-11-22.
  3. 1 2 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. S2CID 197531313.
  4. ↑ H. Arp (1966). "Atlas of Peculiar Galaxies". Astrophysical Journal Supplement. 14: 1–20. Bibcode:1966ApJS...14....1A. doi:10.1086/190147.
  5. ↑ "SN 2020dko". Transient Name Server. IAU. Retrieved 26 December 2025.
[edit]
  • Wikimedia Commons logo Media related to Arp 240 at Wikimedia Commons
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