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Proper NameNone
Bayer DesignationTheta Andromedae
Flamsteed Number24 Andromedae
HR (BSC)63
Right Ascension0h 17m 6s
Declination+38° 40' 54"
Distance309 light years
95 parsecs
MagnitudeApparent: +4.6
Absolute: -0.3
Spectral ClassA2V white main sequence star
Optimum VisibilityOctober
NotesTheta Andromedae is a binary system consisting of two white stars, with the secondary in a very close orbit around the primary, at a distance comparable to the Earth's from the Sun. This is possibly a triple system, with a third fainter companion about ten times farther from the primary star.

A faint star in the central parts of Andromeda, a little over five degrees away from the famous Andromeda Galaxy. It is a white (A-type) star belonging to the main sequence, and so is in some superficial ways similar to Sirius, though it is nearly thirty times further away than that brilliant star.


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