B-type star · blue-white star
42 Cas
42 Cas is a blue-white star in the constellation Cassiopeia 278 ly from Earth. Its surface is about 10,408 K, about 1.8 times the Sun's surface temperature, and it shines at 53.46× the Sun's brightness. At magnitude 5.2 it is bright enough to see with the naked eye; the light you see left it 278 years ago.
Also catalogued as HR 480 · HD 10250 · HIP 8016
10,408 K
temperature
5.18
apparent magnitude
53.46× ☉
luminosity vs Sun
B9V
spectral type
Distance & comparison with our Sun
278 years
at light speed from Earth
1.80×
as hot as the Sun
53.46×
the Sun's light output
0.53
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.