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- Delta_Persei abstract "Delta Persei (Delta Per, δ Persei, δ Per) is a double star in the northern constellation of Perseus. It has an apparent visual magnitude of 3.01, making it readily visible with the naked eye. Parallax measurements give it a distance of about 520 light-years (160 parsecs) from the Earth.The spectrum of this star matches a stellar classification of B5 III, which indicates it is a giant star that has evolved away from the main sequence after exhausting the hydrogen at its core. It has about seven times the Sun's mass and has an estimated age of 6.8 million years. The effective temperature of the outer envelope is 14,890 K, with the energy being emitted at this temperature giving it the blue-white hue that is a characteristic of a B-type star. It is rotating rapidly with a projected rotational velocity of 190 km s−1, which gives a lower bound for the actual azimuthal velocity along the star's equator.This is most probably a binary star and may be a triple star system. It has an optical companion with an apparent magnitude of +6.17 at an angular separation of 0.330 arcseconds and a position angle of 221°, but it is uncertain whether this is an optical double star or a gravitationally bound companion. The star has also been categorized as a spectroscopic binary, indicating that it has an orbiting companion that has not been separately resolved with a telescope. Finally, this star may be a member of the Melotte 20 open cluster, which would make it the second brightest member after Mirfak.Observation with the IRAS shows an extended, ring-like feature that may be a bow wave driven by radiation pressure from the star, rather than a bubble being generated by the stellar wind. This feature has an angular size of 15 × 25 arcminutes and a peak temperature of 38 K. It has an estimated peculiar velocity of more than 30 km s−1, making it a runaway star.".
- Delta_Persei thumbnail Perseus_IAU.svg?width=300.
- Delta_Persei wikiPageExternalLink al_thurayya.html.
- Delta_Persei wikiPageID "8373936".
- Delta_Persei wikiPageRevisionID "601542299".
- Delta_Persei appmagV "3.01".
- Delta_Persei bV "–0.12".
- Delta_Persei class "B5 III".
- Delta_Persei constell Perseus_(constellation).
- Delta_Persei epoch "J2000".
- Delta_Persei gravity "3.5".
- Delta_Persei hasPhotoCollection Delta_Persei.
- Delta_Persei pError "0.47".
- Delta_Persei parallax "6.32".
- Delta_Persei propMoDec "−43.06".
- Delta_Persei propMoRa "+25.58".
- Delta_Persei radialV "+4".
- Delta_Persei radius "10.5".
- Delta_Persei rotationalVelocity "190".
- Delta_Persei temperature "14890".
- Delta_Persei uB "–0.51".
- Delta_Persei subject Category:Alpha_Persei_Cluster.
- Delta_Persei subject Category:Bayer_objects.
- Delta_Persei subject Category:Flamsteed_objects.
- Delta_Persei subject Category:Perseus_(constellation).
- Delta_Persei type BayerObjects.
- Delta_Persei type FlamsteedObjects.
- Delta_Persei type Object100002684.
- Delta_Persei type PhysicalEntity100001930.
- Delta_Persei type CelestialBody.
- Delta_Persei type Star.
- Delta_Persei type PhysicalBody.
- Delta_Persei comment "Delta Persei (Delta Per, δ Persei, δ Per) is a double star in the northern constellation of Perseus. It has an apparent visual magnitude of 3.01, making it readily visible with the naked eye. Parallax measurements give it a distance of about 520 light-years (160 parsecs) from the Earth.The spectrum of this star matches a stellar classification of B5 III, which indicates it is a giant star that has evolved away from the main sequence after exhausting the hydrogen at its core.".
- Delta_Persei label "Delta Persei".
- Delta_Persei label "Delta Persei".
- Delta_Persei label "Delta Persei".
- Delta_Persei label "Delta Persei".
- Delta_Persei label "Delta Persei".
- Delta_Persei label "ペルセウス座デルタ星".
- Delta_Persei label "天船五".
- Delta_Persei sameAs Delta_Persei.
- Delta_Persei sameAs Delta_Persei.
- Delta_Persei sameAs Delta_Persei.
- Delta_Persei sameAs Delta_Persei.
- Delta_Persei sameAs ペルセウス座デルタ星.
- Delta_Persei sameAs Delta_Persei.
- Delta_Persei sameAs m.02716r9.
- Delta_Persei sameAs Q2743026.
- Delta_Persei sameAs Q2743026.
- Delta_Persei sameAs Delta_Persei.
- Delta_Persei wasDerivedFrom Delta_Persei?oldid=601542299.
- Delta_Persei depiction Perseus_IAU.svg.
- Delta_Persei isPrimaryTopicOf Delta_Persei.
- Delta_Persei name "Delta Persei".