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Collinder 320

NGC 6250

Open star cluster in Ara

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Proper Name	None
Messier Number	None
NGC/IC Number	!NGC! 6250
Other Designations	Collinder 320
Constellation	Ara
Right Ascension	16h 57m 59s
Declination	-45° 57' 4"
Distance	c.3,300 light years c.1,000 parsecs
Magnitude	Apparent: +7.63 Absolute: -2.37
Diameter	Apparent: 13° Actual: 12 light years
Number of Stars	c. 150
Optimum Visibility	June (Usually visible from southern latitudes)

Two of the three brighter stars in this image are part of the cluster Collinder 320 or, at least, their parallax data suggests that they lie in the same region of space. The more easterly of the three, however, seems to be unrelated to the cluster. This is HD 152917, a bright yellow dwarf that is considerably closer than Collinder 320, and so lies in the foreground of this image. Imagery provided by Aladin sky atlas

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