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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 Cluster, C50, has created a darker region some thirty light years across, adding to the overall impression of a rosette shape.

The circular pocket in the centre of the Rosette Nebula is caused by the hundreds of newly-formed stars in the heart of the nebula, collectively known as the Rosette Cluster. Though there are estimated to be more than two thousand young stars in this central cluster, two of these are particularly massive - HD 46150 and HD 46223 - and these two have played a significant role in hollowing the interior regions of the surrounding Rosette Nebula. Imagery provided by Aladin sky atlas

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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