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| NGC 6745 | |
|---|---|
 Irregular Galaxy NGC 6745A with NGC 6745B (bottom right) imaged by theHubble Space Telescope | |
| Observation data (J2000epoch) | |
| Constellation | Lyra |
| Right ascension | 19h 01m 41.7s[1] |
| Declination | +40° 45′ 11″[1] |
| Redshift | 4545 ± 60 km/s[1] |
| Distance | 206Mly[2] |
| Apparent magnitude (V) | 13.3[1] |
| Characteristics | |
| Type | S?[1] |
| Apparent size (V) | 1.4′[1] |
| Other designations | |
| UGC 11391,PGC 62691,[1] Bird's Head,[3]NGC 6745a / 6745b / 6745c[3] | |
NGC 6745 (also known asUGC 11391) is anirregular galaxy about 206 millionlight-years (63.5 mega-parsecs) away in theconstellationLyra. It was discovered byFrench astronomerÉdouard Stephan on 24 July 1879.[4]
NGC 6745 is actually a trio of galaxies in the process ofcolliding. The three galaxies have been colliding for hundreds of millions of years. After passing through the larger galaxy (NGC 6745A), the smaller one (NGC 6745B) is now moving away. The larger galaxy was probably aspiral galaxy before the collision, but was damaged and now appearspeculiar. It is unlikely that any stars in the two galaxies collided directly because of the vast distances between them. Thegas,dust, and ambientmagnetic fields of the galaxies, however, do interact directly in a collision. As a result of this interaction, the smaller galaxy has probably lost most of itsinterstellar medium to the larger one.
Foursupernovae have been observed in NGC 6745: SN 1999bx (type II, mag. 16.5),[5] SN 2022prr (type IIn, mag. 17.3),[6] SN 2023ucy (type II, mag. 17.9),[7] and SN 2024ljc (type IIb, mag. 18.7).[8]
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