HD 166
Star
HD 166 or V439 Andromedae is a 6th magnitude star in the constellation Andromeda, approximately 45 light years away from Earth. It is a variable star of the BY Draconis type, varying between magnitudes 6.13 and 6.18 with a 6.23 days periodicity. Wikipedia
Mass: 0.889 M☉
B−V color index: +0.755
Distance: 44.94 ± 0.03 ly; (13.779 ± 0.009 pc)
Rotation: 6.23±0.01 days
U−B color index: +0.30
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