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Theta Aurigae, 37 Aurigae

Proper NameMahasim
Bayer DesignationTheta Aurigae
Flamsteed Number37 Aurigae
HR (BSC)2095
Right Ascension5h 59m 43s
Declination+37° 12' 45"
Distance166 light years
51 parsecs
MagnitudeApparent: +2.7
Absolute: -0.9
Spectral ClassA0VpSi white main sequence star
Optimum VisibilityJanuary
NotesTheta Aurigae is a binary system. The primary (to which the name Mahasim formally belongs) is a massive white star, and a variable of the Alpha2 Canum Venaticorum class. It has a much less massive and luminous companion, a dwarf star of the bright yellow F-type spectral classification.

Mahasim is a hot white star which varies in brightness. This variability seems to be related to the physical properties of the star itself, perhaps by variations in its surface, or by rings of matter surrounding the main star.


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