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- Pi1_Ursae_Majoris abstract "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 46.8 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 μm grains of amorphous silicates or crystalline forsterite. There may also be a wider ring of larger (10 μm) grains out to a distance of 16 AU.".
- Pi1_Ursae_Majoris thumbnail Ursa_Major_IAU.svg?width=300.
- Pi1_Ursae_Majoris wikiPageExternalLink SECTION000610000000000000000.
- Pi1_Ursae_Majoris wikiPageExternalLink detail.php?starchoice=42438.
- Pi1_Ursae_Majoris wikiPageID "2713203".
- Pi1_Ursae_Majoris wikiPageRevisionID "601566564".
- Pi1_Ursae_Majoris absmagV "4.86".
- Pi1_Ursae_Majoris ageMyr "200".
- Pi1_Ursae_Majoris appmagV "5.63".
- Pi1_Ursae_Majoris bV "+0.62".
- Pi1_Ursae_Majoris class "G1.5Vb".
- Pi1_Ursae_Majoris constell Ursa_Major.
- Pi1_Ursae_Majoris epoch "J2000".
- Pi1_Ursae_Majoris gravity "4.48".
- Pi1_Ursae_Majoris luminosity "0.97".
- Pi1_Ursae_Majoris mass "0.9".
- Pi1_Ursae_Majoris metalFe "–0.04".
- Pi1_Ursae_Majoris pError "0.37".
- Pi1_Ursae_Majoris parallax "69.66".
- Pi1_Ursae_Majoris rotation "432000.0".
- Pi1_Ursae_Majoris rotationalVelocity "14.27".
- Pi1_Ursae_Majoris uB "+0.07".
- Pi1_Ursae_Majoris variable "BY Draconis".
- Pi1_Ursae_Majoris subject Category:BY_Draconis_variables.
- Pi1_Ursae_Majoris subject Category:Bayer_objects.
- Pi1_Ursae_Majoris subject Category:Circumstellar_disks.
- Pi1_Ursae_Majoris subject Category:Flamsteed_objects.
- Pi1_Ursae_Majoris subject Category:G-type_main-sequence_stars.
- Pi1_Ursae_Majoris subject Category:Henry_Draper_Catalogue_objects.
- Pi1_Ursae_Majoris subject Category:Objects_within_100_ly_of_Earth.
- Pi1_Ursae_Majoris subject Category:Solar-type_stars.
- Pi1_Ursae_Majoris subject Category:Stars_with_proper_names.
- Pi1_Ursae_Majoris subject Category:Ursa_Major_(constellation).
- Pi1_Ursae_Majoris type CelestialBody.
- Pi1_Ursae_Majoris type Star.
- Pi1_Ursae_Majoris type PhysicalBody.
- Pi1_Ursae_Majoris comment "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 46.8 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.".
- Pi1_Ursae_Majoris label "Pi1 Ursae Majoris".
- Pi1_Ursae_Majoris label "Pi1 Ursae Majoris".
- Pi1_Ursae_Majoris label "Pi1 Ursae Majoris".
- Pi1_Ursae_Majoris label "內階增九".
- Pi1_Ursae_Majoris sameAs Pi1_Ursae_Majoris.
- Pi1_Ursae_Majoris sameAs 큰곰자리_파이1.
- Pi1_Ursae_Majoris sameAs Pi1_Ursae_Majoris.
- Pi1_Ursae_Majoris sameAs m.07zl0p.
- Pi1_Ursae_Majoris sameAs Q912296.
- Pi1_Ursae_Majoris sameAs Q912296.
- Pi1_Ursae_Majoris wasDerivedFrom Pi1_Ursae_Majoris?oldid=601566564.
- Pi1_Ursae_Majoris depiction Ursa_Major_IAU.svg.
- Pi1_Ursae_Majoris isPrimaryTopicOf Pi1_Ursae_Majoris.
- Pi1_Ursae_Majoris name "Pi1 Ursae Majoris".
