Introduction | Map | My Own Photos | My Own Observations | References
On this page I collect my observations of the open star cluster M 21 in the constellation Sagittarius.
The open star cluster M 21 is located in the constellation Sagittarius and is, according to Stoyan, often given little attention to. To him, it is attractive, because it can be observed with the telescope with M 20 (Trifid Nebula) in the same field of view (40').
Size: 7' (Stoyan)
Distance: 4,000 light years (Stoyan)
Rating: * (Stoyan)
M 21 in the constellation Sagittarius and in the context of other nearby DSO; M 20 is directly below it, and both can be observed together in a telescope. (Image Courtesy of SkySafari Astronomy, www.simulationcurriculum.com)
M 21 - May 29, 2020, disturbed |
M 21 - Aug 23, 2020 |
M 21 - Aug 23, 2020, photo left processed |
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M 21 - Jul 18, 2021 |
M 21 - Jul 18, 2021, photo left processed |