NGC 6745 (also known as UGC 11391) is an irregular galaxy about 206 million light-years (63.5 mega-parsecs) away in the constellation Lyra. It is actually a trio of galaxies in the process of colliding.

This article includes a list of general references, but it lacks sufficient corresponding inline citations. (October 2020)

NGC 6745
Irregular Galaxy NGC 6745A with NGC 6745B (bottom right)
Observation data (J2000 epoch)
Constellation	Lyra
Right ascension	19h 01m 41.7s[1]
Declination	+40° 45′ 11″[1]
Redshift	4545 ± 60 km/s[1]
Distance	206 Mly[2]
Apparent magnitude (V)	13.3[1]
Characteristics
Type	S?[1]
Apparent size (V)	1′.4[1]
Other designations
UGC 11391,[1] PGC 62691,[1] Bird's Head,[3] NGC 6745a / 6745b / 6745c[3]

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 a spiral galaxy before the collision, but was damaged and now appears peculiar. It is unlikely that any stars in the two galaxies collided directly because of the vast distances between them. The gas, dust, and ambient magnetic 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 its interstellar medium to the larger one.

See also

• IC 1296
• Antennae Galaxies

References

External links

• Media related to NGC 6745 at Wikimedia Commons
• NGC 6745: The Astronomer's Story
• HubbleSite - NewsCenter - A Bird's Eye view of a Galaxy Collision
• NASA Astronomy Picture of the Day: A Galaxy Collision in NGC 6745 (2 November 2000)

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