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Blue Horsehead Nebula

IC 4592

Proper NameBlue Horsehead Nebula
Messier NumberNone
NGC/IC NumberIC 4592
Right Ascension16h 13m 0s
Declination-19° 18' 0"
Distance424 light years
130 parsecs
MagnitudeApparent: +3.90
Absolute: -1.67
DimensionsApparent: 150' x 60'
Actual: 19 light years
Optimum VisibilityJune

The resemblance of this nebula to a horse's head is rather clearer when it is viewed inverted (as it would be seen through an optical telescope), though even aligned to the north, as here, the approximate shape of a horsehead in profile can be distinguished. The blue 'eye' of the horse is the fourh-magnitude star Jabbah or Nu Scorpii, while the brighter star to the west (right) is the multiple star Acrab (also called Graffias or Beta Scorpii). Imagery provided by Aladin sky atlas


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