M21 (Open cluster)
R/B-band color composite image from the Second Digitized Sky Survey (DSS2), measuring 10 arcminutes across.
Finder chart
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From Cambridge , M21 is visible in the dawn sky, rising at 23:59 (EDT) and reaching an altitude of 25° above the southern horizon before fading from view as dawn breaks at around 04:32.
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|
Name
M21
|
Object type
Open cluster
|
Position
| Right ascension: | 18h04m [3] |
| Declination: | −22°29' [3] |
| Constellation: | Sagittarius |
| Magnitude: | 5.90 (V) [5] |
| Distance: | 1.2 kpc 3.9 klyr [2] |
Derived quantities
| Absolute mag (V): | -4.50 |
Sources
Visibility from Cambridge
All times shown in Cambridge local time.