The open cluster M 21
Red-band image from the Second Digitized Sky Survey (DSS2), measuring 10 arcminutes across.
Finder chart
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From Cambridge , M 21 is not observable – it will reach its highest point in the sky during daytime and is no higher than 4° above the horizon at dawn.
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|
Name
M 21
|
Object Type
Open Cluster
|
Position
| Constellation: | Sagittarius |
| Magnitude: | 5.90 (V) [3] |
| Right ascension: | 18h04m [2] |
| Declination: | -22°29' [2] |
| Distance: | 1.2 kpc 3.9 klyr [1] |
Derived Quantities
| Absolute mag (V): | -4.50 |