M39 (Open cluster)
R/B-band color composite image from the Second Digitized Sky Survey (DSS2), measuring 19 arcminutes across.
From Cambridge , M39 is visible all night. It will become visible at around 21:41 (EDT), 40° above your north-eastern horizon, as dusk fades to darkness. It will be lost to dawn twilight at around 03:56, 74° above your north-western horizon.
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Name
M39
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Object type
Open cluster
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Position
| Right ascension: | 21h31m [3] |
| Declination: | +48°26' [3] |
| Constellation: | Cygnus |
| Magnitude: | 4.60 (V) [5] 4.66 (B) [3] |
| Distance: | 326.0 parsec 1062.8 lightyrs [2] |
| B-V Color (mag): | 0.06 |
Derived quantities
| Absolute mag (V): | -2.97 |
Sources