Messier 69
Coordinates: 
18h 31m 23.23s, −32° 20′ 52.7″
18h 31m 23.23s, −32° 20′ 52.7″
Distance | 29 kly (8.8 kpc)[3] | |
|---|---|---|
| Apparent magnitude (V) | 7.6[4] | |
| Apparent dimensions (V) | 10.8′[3] | |
| Physical characteristics | ||
| Mass | 2.0×105 M☉[5] M☉ | |
| Radius | 45 ly[6] | |
| Tidal radius | 91.9 ly.[3] | |
| Metallicity | = –0.78 Gyr[7] | |
| Other designations | GCl 96, M69, NGC 6637,[8]NGC 6634[9] | |
![{\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4c0821bd80891e071c08e7c7ee8e022baedf522c)
Messier 69 or M69, also known NGC 6637, and NGC 6634,[9][10] is a globular cluster in the southern constellation of Sagittarius.[a] It can be found 2.5° to the northeast of the star Epsilon Sagittarii and is dimly visible in 50 mm aperture binoculars. The cluster was discovered by Charles Messier on August 31, 1780, the same night he discovered M70. At the time, he was searching for an object described by Nicolas-Louis de Lacaille in 1751–2 and thought he had rediscovered it, but it is unclear if Lacaille actually described M69.[11]
This cluster is about 28,700M70 – possibly only 1,800 light-years separates the two.[14]
Gallery
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![As globular clusters go, M69 is one of the most metal-rich on record.[15]](//upload.wikimedia.org/wikipedia/commons/thumb/2/23/Messier_69_Hubble_WikiSky.jpg/120px-Messier_69_Hubble_WikiSky.jpg)
As globular clusters go, M69 is one of the most metal-rich on record.[15] -
Map showing location of M69
![As globular clusters go, M69 is one of the most metal-rich on record.[15]](/File:Messier_69_Hubble_WikiSky.jpg)
See also
- List of Messier objects
References and footnotes
- Bibcode:1927BHarO.849...11S.
- ^ S2CID 119183070.
- ^ S2CID 118548517, A53.
- ^ "Messier 69". SEDS Messier Catalog. Retrieved April 30, 2022.
- ^ Bibcode:1991A&A...252...94M.
- ^ a b From trigonometry: distance × sin( diameter_angle / 2 ) = 28,700 × 0.00157 = 45 ly. radius
- ^ S2CID 51825384.
- ^ "NGC 6637". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 17, 2006.
- ^ a b "Your NED Search Results". ned.ipac.caltech.edu. Retrieved August 31, 2024.
- ^ "NGC/IC Project Restoration Efforts". ngcicproject.observers.org. Retrieved August 31, 2024.
- ISBN 978-1680451917
- ^ S2CID 17333985.
- doi:10.1086/301461.
- ^ Frommert, Hartmut; Kronberg, Christine (July 20, 2011), "Globular Cluster M69", SEDS Messier pages, Students for the Exploration and Development of Space (SEDS), retrieved December 3, 2018.
- ^ "Cosmic riches". ESA/Hubble Picture of the Week. Retrieved October 3, 2012.
- ^ In daily rising of this globular cluster, whether in day- or nighttime, it will reach 15° above the due southern horizon, at the 90°−32°−15° parallel thus the 43rd parallel north, the furthest north for very detailed, easy observation for this object
External links
Wikimedia Commons has media related to Messier 69.
- Messier 69, Galactic Globular Clusters Database page
- Messier 69 on
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