A-type star · white star
Theta Gem
Theta Gem is a white star in the constellation Gemini 189 ly from Earth. Its surface is about 9,008 K, about 1.6 times the Sun's surface temperature, and it shines at 106× the Sun's brightness. At magnitude 3.6 it is bright enough to see with the naked eye; the light you see left it 189 years ago.
Also catalogued as HR 2540 · HD 50019 · HIP 33018
9,008 K
temperature
3.60
apparent magnitude
106× ☉
luminosity vs Sun
A3III
spectral type
Distance & comparison with our Sun
189 years
at light speed from Earth
1.56×
as hot as the Sun
106×
the Sun's light output
-0.22
absolute magnitude
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VISIBLE TO THE NAKED EYE
Star data from the HYG database v4.2 (Astronexus, CC BY-SA 4.0). Temperature and colour computed by gravityfinder from the B-V colour index; the illustration is generated from that temperature, not a photograph.