Theta Geminorum
Template:Short description Template:Starbox begin Template:Starbox image Template:Starbox observe Template:Starbox character Template:Starbox astrometry Template:Starbox detail Template:Starbox catalog Template:Starbox reference Template:Starbox end Theta Geminorum (θ Gem, θ Geminorum) is a single[1] star in the northern zodiac constellation of Gemini. It is visual to the naked eye with an apparent visual magnitude of 3.59.[2] Based upon an annual parallax shift of 17.25 mas,[3] it is about 189 light years distant from the Sun.
This is an evolving A-type subgiant star with a stellar classification of A2 IV.[4] It has 1.80[5] times the mass of the Sun and radiates 93[6] times the solar luminosity. The measured angular diameter is Template:Val.[7] At an estimated distance of this star, this yields a physical size of about 5.1 times the radius of the Sun.[8] It is around 252 million years old and has a projected rotational velocity of 133[9] km/s. This rotation rate is giving the star an oblate shape, with an equatorial bulge that is 11% larger than the polar radius.[10]
The Washington Visual Double Star Catalog lists five visual companions within 100″; the closest and brightest such companion is the magnitude 8.6 θ Geminorum E at an angular separation of 2.4″ along a position angle of 295°, as of 2010.[11]
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