| Arp 220 | |
|---|---|
 A combination of James Webb Space Telescope and Hubble Space Telescope data showing a new view infrared galaxy Arp 220 | |
| Observation data (J2000 epoch) | |
| Constellation | Serpens |
| Right ascension | 15h 34m 57.1s[1] |
| Declination | +23° 30′ 11″[1] |
| Redshift | 0.01840 +/- 0.00002[1] |
| Heliocentric radial velocity | 5434 ± 7 km/s[1] |
| Apparent magnitude (V) | 13.9[1] |
| Characteristics | |
| Type | S?[1] |
| Size | 33.7 kpc (110,000 ly) |
| Apparent size (V) | 1′.5 x 1′.2[1] |
| Other designations | |
| IC 1127,[1] IC 4553,[1] UGC 9913,[1] PGC 55497[1] | |
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Arp 220 is the result of a collision between two galaxies which are now in the process of merging. It is the 220th object in Halton Arp's Atlas of Peculiar Galaxies.