K-type star · orange
HD 9731
HD 9731 is an orange in the constellation Cetus 720 ly from Earth. Its surface is about 4,111 K, about 0.7 times the Sun's surface temperature, and it shines at 116× the Sun's brightness. At magnitude 6.4 it is within reach of 50 mm binoculars; the light you see left it 720 years ago.
Also catalogued as HIP 7363
4,111 K
temperature
6.41
apparent magnitude
116× ☉
luminosity vs Sun
K2III
spectral type
Distance & comparison with our Sun
720 years
at light speed from Earth
0.71×
as hot as the Sun
116×
the Sun's light output
-0.31
absolute magnitude
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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.