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Mahasim

Theta Aurigae, 37 Aurigae

White Star in Auriga

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Proper Name	Mahasim
Bayer Designation	Theta Aurigae
Flamsteed Number	37 Aurigae
HR (BSC)	2095
HD	40312
Constellation	Auriga
Right Ascension	5h 59m 43s
Declination	+37° 12' 45"
Distance	166 light years 51 parsecs
Magnitude	Apparent: +2.7 Absolute: -0.9
Spectral Class	A0VpSi white main sequence star
Optimum Visibility	January
Notes	Theta 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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