B-type star · blue-white star
HR 398
HR 398 is a blue-white star in the constellation Cassiopeia 473 ly from Earth. Its surface is about 10,265 K, about 1.8 times the Sun's surface temperature, and it shines at 53.41× the Sun's brightness. At magnitude 6.3 it is within reach of 50 mm binoculars; the light you see left it 473 years ago.
Also catalogued as HD 8424 · HIP 6685
10,265 K
temperature
6.34
apparent magnitude
53.41× ☉
luminosity vs Sun
A0Vnn
spectral type
Distance & comparison with our Sun
473 years
at light speed from Earth
1.78×
as hot as the Sun
53.41×
the Sun's light output
0.53
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.