Messier Index/M72
Messier 72 | |
---|---|
Observation data (w:J2000 epoch) | |
Constellation | Aquarius |
Right ascension | 20h 53m 27.91s[1] |
Declination | -12° 32′ 13.4″[1] |
Distance | 53-62 kly (16-19 kpc) |
Physical characteristics | |
Mass | kg ( M) |
Notable features | Contains several blue giants |
Other designations | NGC 6981, GCl 118[1] |
Messier 72 (also known as M72 or NGC 6981) is a w:globular cluster in the Aquarius constellation discovered by w:Pierre Méchain in w:August 29 w:1780. w:Charles Messier looked for it on the following w:October 4 and 5, and included it in his catalog. Both decided that it was a faint nebula not a cluster as is now believed. Using 10-inch (250 mm) telescopes, viewing the cluster is difficult resulting in only a view of a faint blurry picture, However using Kopernicks' 20-inch (510 mm) telescope resolution is highly increased. M72 is located at about 53,000 w:light-years away from w:Earth and lies in a considerable distance beyond the w:Galactic Center. Another source states that the cluster is 62,000 light-years away, with a diameter of 42 light-years. Generally considered a young cluster, the cluster has several blue giants, yet star clusters generally contain the oldest stars.
External links
- Messier 72, SEDS Messier pages
- Messier 72, Galactic Globular Clusters Database page
- Messier 72, LRGB CCD image based on two hours total exposure
- M-72 Information
References
- ↑ a b c "SIMBAD Astronomical Database". Results for NGC 6981. Retrieved 2006-11-16.