|Observation data (J2000 epoch)|
|Right ascension||21h 31m 42s|
|Declination||+48° 25′ ″|
|Distance||(326 pc (1,060 ly))|
|Apparent magnitude (V)||+5.5|
|Apparent dimensions (V)||29′|
|Estimated age||278 Ma|
|Other designations||Messier 39, NGC 7092|
Messier 39 (also known as M39, or NGC 7092) is an open cluster in the constellation of Cygnus. It was discovered by Charles Messier in 1764. M39 is at a distance of about 326 pc (1,060 ly) from Earth whose age is estimated to be from 278 million years.
It is located in the sky at Right Ascension 21h 32.2m, and Declination +48° 26′, with a total magnitude (brightness) of 5.5 and size of 29 (arcmin) across. Stellar population of this loose open cluster is about 30 members.
- "WEBDA page for open cluster NGC 7092". Department of Theoretical Physics and Astrophysics of the Masaryk University. Retrieved 18 February 2018.
- "WEBDA page Lynga catalogue data". Department of Theoretical Physics and Astrophysics of the Masaryk University. Retrieved 18 February 2018.
- M39 on ScienceBlogs.com
- Messier 39, SEDS Messier pages
- NASA Astronomy Picture of the Day: M39: Open Cluster in Cygnus (12 April 2009)
- Messier 39 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images