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Lump Star

NGC 2023

Proper NamesLump Star
Messier NumberNone
NGC/IC NumberNGC 2023
Other DesignationsLBN 954
Right Ascension5h 42m 27s
Declination-2° 13' 43"
Distancec.1,500 light years
c.470 parsecs
MagnitudeApparent: +10.0
Absolute: +1.6
Mean DiameterApparent: 10'
Actual: 4.5 light years
Associated Star(s)HD 37903
Optimum VisibilityDecember / January
NotesThe blue subgiant star HD 37903 lies close to the vast dark Orion Molecular Cloud that fills much of Orion. In the region around the star, the hydrogen of the Cloud is illuminated to create a roughly circular patch of blue-white light near the base of the Horsehead Nebula.

The Lump Star is not a true star at all, but a bright nebula in the constellation of Orion. It lies in the same general area as the star Alnitak and the Horsehead Nebula, close to the 'base' of the famous dark horse-head shape.


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