Cluster

M21

M21 · NGC 6531 · MWSC 2796

Captures

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Object data

Designation: M21
Also known as: NGC 6531, MWSC 2796
Type: Cluster
Constellation: Sagittarius
RA (J2000): 18h 04m 13s
Dec (J2000): -22° 29′ 24″
Magnitude: 5.9
Apparent size: 6′
Catalogue: Messier
Reference: Wikipedia

Catalogue values from OpenNGC (CC-BY-SA-4.0).

Best months to observe

From 51.5°N: never climbs far above the horizon in the evening.

January: -61 degrees at 22:00
February: -55 degrees at 22:00
March: -40 degrees at 22:00
April: -21 degrees at 22:00
May: -4 degrees at 22:00
June: 9 degrees at 22:00
July: 16 degrees at 22:00
August: 13 degrees at 22:00
September: 2 degrees at 22:00
October: -14 degrees at 22:00
November: -33 degrees at 22:00
December: -50 degrees at 22:00

Your latitude

Degrees north, negative for south. Recomputed in your browser and remembered on this device.

Altitude at 22:00 local time on the 15th of each month. Twilight, moon and weather are your problem.