A-type star · white star
HR 20
HR 20 is a white star in the constellation Cepheus 344 ly from Earth. Its surface is about 8,140 K, about 1.4 times the Sun's surface temperature, and it shines at 38.23× the Sun's brightness. At magnitude 6.0 it is within reach of 50 mm binoculars; the light you see left it 344 years ago.
Also catalogued as HD 431 · HIP 760
8,140 K
temperature
6.01
apparent magnitude
38.23× ☉
luminosity vs Sun
A7IV
spectral type
Distance & comparison with our Sun
344 years
at light speed from Earth
1.41×
as hot as the Sun
38.23×
the Sun's light output
0.89
absolute magnitude
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BINOCULARS NEEDED
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.