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Pi Ursae Minoris : ウィキペディア英語版 | Pi Ursae Minoris
The Bayer designation Pi Ursae Minoris (π UMi, π Ursae Minoris) is shared by two star systems, π¹ Ursae Minoris and π² Ursae Minoris, in the constellation Ursa Minor. They are separated by 0.64° on the sky. ==π¹ Ursae Minoris==
Pi-1 Ursae Minoris is a triple star system approximately 70.8 light years from Earth. The system is dominated by a binary pair of two yellow G-type subgiants which are 32 arcseconds apart and have apparent magnitudes of +6.9 and +7.8. They also have an 11th magnitude companion, Pi-1 Ursae Minoris C, which is 135 arcseconds away.
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