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- Delta_Ursae_Majoris abstract "Delta Ursae Majoris (Delta UMa, δ Ursae Majoris, δ UMa) is the Bayer designation for a star in the northern circumpolar constellation of Ursa Major. It has the traditional names Megrez /ˈmɛɡrɛz/, and Kaffa. Megrez has an apparent magnitude of +3.3, making it the dimmest of the seven stars in the Big Dipper asterism. Parallax measurements yield a distance estimate of 58.4 light-years (17.9 parsecs) from Earth.Megrez has 63% more mass of the Sun and is about 1.4 times the Sun's radius. It has a stellar classification of A3 V, which means it is an A-type main sequence star that is generating energy at its core through the nuclear fusion of hydrogen. It shines at 14 times the luminosity of the Sun, with this energy being emitted from its outer envelope at an effective temperature of 9,480 K. This gives it the white hue typical of an A-type star.This star has an excess emission of infrared radiation, indicating the presence of circumstellar matter. This forms a debris disk around an orbital radius of 16 Astronomical Units from the star. This radius is unusually small for the estimated age of the disk, which may be explained by drag from the Poynting–Robertson effect causing the dust to spiral inward.It has two faint companions, an 11th magnitude star at an angular separation of 190 arcseconds, and a 10th magnitude star 186 arcseconds away.[citation needed]Megrez is a marginally outlying member of the Ursa Major moving group, an association of stars that share a common motion through space and likely formed in the same molecular cloud. The space velocity components of Delta Ursae Majoris in the galactic coordinate system are [U, V, W] = [+15.35, +1.17, –11.52] km s–1.".
- Delta_Ursae_Majoris thumbnail Ursa_Major_IAU.svg?width=300.
- Delta_Ursae_Majoris wikiPageID "2014504".
- Delta_Ursae_Majoris wikiPageRevisionID "598676729".
- Delta_Ursae_Majoris ageGyr "0.3".
- Delta_Ursae_Majoris appmagV "+3.312".
- Delta_Ursae_Majoris bV "+0.075".
- Delta_Ursae_Majoris class "A3 V".
- Delta_Ursae_Majoris constell Ursa_Major.
- Delta_Ursae_Majoris epoch "J2000".
- Delta_Ursae_Majoris gravity "4.49".
- Delta_Ursae_Majoris hasPhotoCollection Delta_Ursae_Majoris.
- Delta_Ursae_Majoris luminosity "14".
- Delta_Ursae_Majoris mass "1.63".
- Delta_Ursae_Majoris pError "0.25".
- Delta_Ursae_Majoris parallax "55.82".
- Delta_Ursae_Majoris propMoDec "-129.88".
- Delta_Ursae_Majoris propMoRa "+143.42".
- Delta_Ursae_Majoris radialV "-20.2".
- Delta_Ursae_Majoris radius "1.4".
- Delta_Ursae_Majoris rotationalVelocity "233".
- Delta_Ursae_Majoris temperature "9480".
- Delta_Ursae_Majoris uB "+0.067".
- Delta_Ursae_Majoris subject Category:A-type_main-sequence_stars.
- Delta_Ursae_Majoris subject Category:Bayer_objects.
- Delta_Ursae_Majoris subject Category:Stars_with_proper_names.
- Delta_Ursae_Majoris subject Category:Triple_star_systems.
- Delta_Ursae_Majoris subject Category:Ursa_Major_(constellation).
- Delta_Ursae_Majoris type A-typeMainSequenceStars.
- Delta_Ursae_Majoris type BayerObjects.
- Delta_Ursae_Majoris type CelestialBody109239740.
- Delta_Ursae_Majoris type NaturalObject100019128.
- Delta_Ursae_Majoris type Object100002684.
- Delta_Ursae_Majoris type PhysicalEntity100001930.
- Delta_Ursae_Majoris type Star109444100.
- Delta_Ursae_Majoris type StarsWithProperNames.
- Delta_Ursae_Majoris type Whole100003553.
- Delta_Ursae_Majoris type CelestialBody.
- Delta_Ursae_Majoris type Star.
- Delta_Ursae_Majoris type PhysicalBody.
- Delta_Ursae_Majoris comment "Delta Ursae Majoris (Delta UMa, δ Ursae Majoris, δ UMa) is the Bayer designation for a star in the northern circumpolar constellation of Ursa Major. It has the traditional names Megrez /ˈmɛɡrɛz/, and Kaffa. Megrez has an apparent magnitude of +3.3, making it the dimmest of the seven stars in the Big Dipper asterism. Parallax measurements yield a distance estimate of 58.4 light-years (17.9 parsecs) from Earth.Megrez has 63% more mass of the Sun and is about 1.4 times the Sun's radius.".
- Delta_Ursae_Majoris label "Delta Ursae Majoris".
- Delta_Ursae_Majoris label "Delta Ursae Majoris".
- Delta_Ursae_Majoris label "Delta Ursae Majoris".
- Delta_Ursae_Majoris label "Megrez".
- Delta_Ursae_Majoris label "Megrez".
- Delta_Ursae_Majoris label "Megrez".
- Delta_Ursae_Majoris label "Megrez".
- Delta_Ursae_Majoris label "Megrez".
- Delta_Ursae_Majoris label "Мегрец".
- Delta_Ursae_Majoris label "المغرز (نجم)".
- Delta_Ursae_Majoris label "おおぐま座デルタ星".
- Delta_Ursae_Majoris label "天權".
- Delta_Ursae_Majoris sameAs Megrez.
- Delta_Ursae_Majoris sameAs Megrez.
- Delta_Ursae_Majoris sameAs Megrez.
- Delta_Ursae_Majoris sameAs Delta_Ursae_Majoris.
- Delta_Ursae_Majoris sameAs Megrez.
- Delta_Ursae_Majoris sameAs おおぐま座デルタ星.
- Delta_Ursae_Majoris sameAs 메그레즈.
- Delta_Ursae_Majoris sameAs Megrez.
- Delta_Ursae_Majoris sameAs Megrez.
- Delta_Ursae_Majoris sameAs Delta_Ursae_Majoris.
- Delta_Ursae_Majoris sameAs m.06f3wf.
- Delta_Ursae_Majoris sameAs Q850779.
- Delta_Ursae_Majoris sameAs Q850779.
- Delta_Ursae_Majoris sameAs Delta_Ursae_Majoris.
- Delta_Ursae_Majoris wasDerivedFrom Delta_Ursae_Majoris?oldid=598676729.
- Delta_Ursae_Majoris depiction Ursa_Major_IAU.svg.
- Delta_Ursae_Majoris isPrimaryTopicOf Delta_Ursae_Majoris.
- Delta_Ursae_Majoris name "Delta Ursae Majoris".