Pi<sup>1</sup> Ursae Majoris (Pi<sup>1</sup> UMa, ÃÂ<sup>1</sup> Ursae Majoris, ÃÂ<sup>1</sup> 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.
An excess of infrared radiation has been detected from this system, which suggests the presence of a debris disk. The best fit to the data indicates that there is a ring of fine debris out to a radius of about 0.4 AU, consisting of 0.25 üm grains of amorphous silicates or crystalline forsterite. There may also be a wider ring of larger (10 üm) grains out to a distance of 16 AU.
With ÃÂ<sup>2</sup>, ÃÂ<sup>1</sup>, ÃÂ<sup>2</sup>, ÃÂ, A and d, it composed the Arabic asterism Al ṬhibÃÂá¾½, the Gazelle. According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Ṭhibàwere the title for seven stars : A as Althiba I, this star (ÃÂ<sup>1</sup>) as Althiba II, ÃÂ<sup>2</sup> as Althiba III, àas Althiba IV, ÃÂ<sup>1</sup> as Althiba V, ÃÂ<sup>2</sup> as Althiba VI, and d as Althiba VII.