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Rosette Nebula

C49, NGC 2237, NGC 2238, NGC 2239, NGC 2246

Proper NameRosette Nebula
Caldwell NumberC49
NGC/IC NumbersNGC 2237, NGC 2238, NGC 2239, NGC 2246
Right Ascension6h 31m 40s
Declination+4° 57' 48"
Distancec.5,500 light years
c.1,700 parsecs
MagnitudeApparent: +4.8
Absolute: -6.3
Mean DiameterApparent: 1° 54'
Actual: c.90 light years
Associated Star(s)Open cluster C50, the Rosette Cluster
Optimum VisibilityJanuary
NotesA cloud of ionised hydrogen more than a hundred light years across with the characteristic red-pink colour of an H II region. In the centre of the nebula, pressure from the Rosette luster, C50, has created a darker region some thirty light years across, adding to the overall impression of a rosette shape.

A roughly spherical nebula in the constellation of Monoceros. It is a rich red-pink in colour, hence its name, and surrounds a young cluster of stars some 5,500 light years from Earth.


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