NGC 1980

NGC 1980
The Orion Nebula M42 with NGC 1980 on the right (right is south)
Observation data (J2000.0 epoch)
Right ascension	05h 25m 26.0s[1]
Declination	−05° 54′ 36″[1]
Distance	1793 ly[2] (550 pc[2])
Apparent magnitude (V)	2.5[3]
Apparent dimensions (V)	14.00 x 14.0[4]
Physical characteristics
Estimated age	4.7 million
Other designations	Lower Sword,[5] Collinder 72, OCL 529, WH V 31
Associations
Constellation	Orion
See also: Open cluster, List of open clusters

NGC 1980 (also known as OCL 529, Collinder 72 and The Lost Jewel of Orion^[6]) is a young open cluster associated with an emission nebula in the constellation Orion. It was discovered by William Herschel on 31 January 1786.^[7] Its apparent size is 14 × 14 arc minutes and it is located around the star Iota Orionis on the southern tip of the Orion constellation.^[4][8]

Herschel made his first observation of the cluster which was called WH V 31 on 31 January 1786, but he possibly observed it during his studies of double stars on 20 September 1783.^[7]

1. ^ ^{a b} "NED results for object NGC 1980*". NED. Retrieved 27 November 2017.
2. ^ ^{a b} "The open cluster NGC 1980". In the Sky. Retrieved 27 November 2017.
3. ^ "ngc 1980". sim-id. Retrieved 2020-06-07.^{[permanent dead link]}
4. ^ ^{a b} "Object: NGC 1980 (*)". SEDS. Retrieved 27 November 2017.
5. ^ "NGc 1980". sim-id. Retrieved 2020-06-10.
6. ^ O'Meara, Stephen James (2007). Deep-Sky Companions: Hidden Treasures. Cambridge University Press. pp. 155–157. ISBN 9780521837040.
7. ^ ^{a b} "NGC 1980 (= OCL 529), the ί Orionis Nebula". cseligman. Retrieved 27 November 2017.
8. ^ "Star Cluster Near Orion Nebula Revealed in Telescope Views". Space.com. November 14, 2012. Retrieved 27 November 2017.

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