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• Gamma_Persei abstract "Gamma Persei (Gamma Per, γ Persei, γ Per) is a binary star system in the constellation Perseus. The combined apparent visual magnitude of the pair is +2.9, making it the fourth brightest member of the constellation. The distance to this system has been measured using the parallax technique, giving an estimate of roughly 243 light-years (75 parsecs) with a 4% margin of error. About 4° to the north of Gamma Persei is the radiance point for the annual Perseid meteor shower.This is a wide eclipsing binary system with an orbital period of 5,329.8 days (14.6 years). This eclipse was first observed in 1990 and lasted for two weeks. During an eclipse, the primary passes in front of the secondary, causing the magnitude of the system to decrease by 0.55. The primary component of this system is a giant star with a stellar classification of G9 III. It has a projected rotational velocity of 50.0 km s−1 and a lengthy estimated rotation period of 14.6 years. The classification of the secondary remains tentative, with assignments of A3 V and A2(III).Mass estimates for the two stars remain disparate. Using speckle interferometery, McAlister (1982) obtained mass estimates of 4.73 M☉ for the primary and 2.75 M☉ for the secondary, where M☉ is the mass of the Sun. He noted that the mass estimate was too high for the given classification of the primary. Martin and Mignard (1998) determined masses for both components based on data from the Hipparcos mission: 5.036 ± 0.951 M☉ for the primary and 2.295 ± 0.453 M☉ for the secondary. They admit that the high inclination of the orbit resulted in a large margin of error. Prieto and Lambert (1999) came up with a mass estimate of 3.81 M☉ for the primary, while Pizzolato and Maggio (2000) obtained 4.34 M☉. Ling et al. (2001) obtained estimates of 2.7 M☉ for the primary and 1.65 M☉ for the secondary, while Kaler (2001) obtained 2.5 and 1.9, respectively.".
• Gamma_Persei thumbnail Perseus_IAU.svg?width=300.
• Gamma_Persei wikiPageExternalLink al_thurayya.html.
• Gamma_Persei wikiPageID "8316497".
• Gamma_Persei wikiPageRevisionID "604253858".
• Gamma_Persei absmagV "–1.50".
• Gamma_Persei appmagV "2.93".
• Gamma_Persei axis "0.144".
• Gamma_Persei bV "+0.70".
• Gamma_Persei class "G9 III + A2–A3".
• Gamma_Persei component "γ Per A".
• Gamma_Persei component "γ Per B".
• Gamma_Persei constell Perseus_(constellation).
• Gamma_Persei eccentricity "0.785".
• Gamma_Persei epoch Epoch_(astronomy).
• Gamma_Persei gravity "2.83".
• Gamma_Persei hasPhotoCollection Gamma_Persei.
• Gamma_Persei inclination "90.9".
• Gamma_Persei mass "1.65".
• Gamma_Persei mass "2.7".
• Gamma_Persei metalFe "–0.19".
• Gamma_Persei node "244.1".
• Gamma_Persei pError "0.51".
• Gamma_Persei parallax "13.41".
• Gamma_Persei periarg "170".
• Gamma_Persei periastron "1991.08".
• Gamma_Persei period "14.6".
• Gamma_Persei propMoDec "–5.92".
• Gamma_Persei propMoRa "+0.51".
• Gamma_Persei radialV "+2.5".
• Gamma_Persei rotation "4.6224E8".
• Gamma_Persei rotationalVelocity "50".
• Gamma_Persei temperature "5170".
• Gamma_Persei temperature "7895".
• Gamma_Persei uB "+0.45".
• Gamma_Persei subject Category:Bayer_objects.
• Gamma_Persei subject Category:Perseus_(constellation).
• Gamma_Persei type BayerObjects.
• Gamma_Persei type Object100002684.
• Gamma_Persei type PhysicalEntity100001930.
• Gamma_Persei type CelestialBody.
• Gamma_Persei type Star.
• Gamma_Persei type PhysicalBody.
• Gamma_Persei comment "Gamma Persei (Gamma Per, γ Persei, γ Per) is a binary star system in the constellation Perseus. The combined apparent visual magnitude of the pair is +2.9, making it the fourth brightest member of the constellation. The distance to this system has been measured using the parallax technique, giving an estimate of roughly 243 light-years (75 parsecs) with a 4% margin of error.".
• Gamma_Persei label "Gamma Persei".
• Gamma_Persei label "Gamma Persei".
• Gamma_Persei label "Gamma Persei".
• Gamma_Persei label "Gamma Persei".
• Gamma_Persei label "Gamma Persei".
• Gamma_Persei label "ペルセウス座ガンマ星".
• Gamma_Persei label "天船二".
• Gamma_Persei sameAs Gamma_Persei.
• Gamma_Persei sameAs Gamma_Persei.
• Gamma_Persei sameAs Gamma_Persei.
• Gamma_Persei sameAs Gamma_Persei.
• Gamma_Persei sameAs ペルセウス座ガンマ星.
• Gamma_Persei sameAs Gamma_Persei.
• Gamma_Persei sameAs m.026_5jp.
• Gamma_Persei sameAs Q13802.
• Gamma_Persei sameAs Q13802.
• Gamma_Persei sameAs Gamma_Persei.
• Gamma_Persei wasDerivedFrom Gamma_Persei?oldid=604253858.
• Gamma_Persei depiction Perseus_IAU.svg.
• Gamma_Persei isPrimaryTopicOf Gamma_Persei.
• Gamma_Persei name "Gamma Persei".