Pi1 Ursae Majoris (Pi1 UMa, π1 Ursae Majoris, π1 UMa) is a yellow G-type main sequence dwarf with a mean apparent magnitude of +5.63. It is approximately 47.1 light years from Earth, and is a relatively young star with an age of about 200 million years. It is classified as a BY Draconis type variable star and its brightness varies by 0.08 magnitudes. In 1986, it became the first solar-type star to have the emission from an X-ray flare observed. Based upon its space velocity components, this star is a member of the Ursa Major moving group of stars that share a common motion through space.