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Collinder 121

Open cluster in Canis Major

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Proper Name	None
Messier Number	None
NGC/IC Number	None
Other Designations	Collinder 121
Constellation	Canis Major
Right Ascension	6h 56m 20s
Declination	-24° 43' 48"
Distance	c. 3,600 light years c. 1,100 parsecs (uncertain)
Magnitude	Apparent: +2.59 Absolute: -7.61
Diameter	Apparent: 60' Actual: 62.6 light years
Optimum Visibility	January

The heart of the open cluster Collinder 121, shown here, lies in central Canis Major and is about a degree across. Its periphery extends out beyond this central area, and loosely bound member stars are to be found scattered far afield throughout its home constellation. The bright star seen to the northeast (upper left) of centre here is HR 2607, a foreground star unconnected with the Collinder 121 cluster beyond. Imagery provided by Aladin sky atlas

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