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- Eta_Sagittarii abstract "Eta Sagittarii (Eta Sgr, η Sagittarii, η Sgr) is a binary star system in the southern zodiac constellation of Sagittarius. Based upon parallax measurements, it is located at a distance of 146 light-years (45 parsecs) from Earth. It was formerly known as "Beta Telescopii" (β Tel). In India, where part of the constellation of Sagittarius represents an Elephant, this star forms the creature's tail.The primary component, η Sagittarii A, is a red giant star with a stellar classification of M2 III. It is an evolved star that is currently at a stage called the asymptotic giant branch, having exhausted both the hydrogen and the helium at its core. This star is classified as an oxygen-rich irregular variable, as it undergoes small magnitude fluctuations between +3.08 and 3.12. The measured angular diameter of this star is 11.9 ± 2.1 mas. At the estimated distance of Eta Draconis, this yields a physical size of about 57 times the radius of the Sun.The companion, η Sagittarii B, was first noted by American astronomer S. W. Burnham in 1879. The two stars share a common proper motion and hence are probably gravitationally bound to each other. The secondary is likely an F-type main sequence star with an apparent magnitude of +7.77. It located at an angular separation of 3.6 arcseconds from the primary, along a position angle of 108°. This star is at a projected distance of 165 Astronomical Units from the red giant primary and the pair take a minimum of 1,270 years to complete an orbit.Within the context of the Milky Way galaxy, this system is a member of the faint old disk group. Because of proper motion, this star will move into constellation Corona Australis around 6300 CE. Eta Sagittarii has two optical companions that are not physically associated with the system. The first is a 10th magnitude star at an angular separation of 93 arcseconds with a position angle of 303°. There is a fainter, 13th magnitude star at an angular separation of 33 arcseconds along a position angle of 276°.".
- Eta_Sagittarii thumbnail Sagittarius_IAU.svg?width=300.
- Eta_Sagittarii wikiPageID "2645765".
- Eta_Sagittarii wikiPageRevisionID "591233178".
- Eta_Sagittarii absmagV "−4.90".
- Eta_Sagittarii appmagV "+3.11/+7.8".
- Eta_Sagittarii bV "+1.56".
- Eta_Sagittarii class "M2 III + F7 V".
- Eta_Sagittarii component "η Sgr A".
- Eta_Sagittarii constell Sagittarius_(constellation).
- Eta_Sagittarii epoch "J2000".
- Eta_Sagittarii hasPhotoCollection Eta_Sagittarii.
- Eta_Sagittarii pError "0.24".
- Eta_Sagittarii parallax "22.35".
- Eta_Sagittarii propMoDec "−166.26".
- Eta_Sagittarii propMoRa "−129.56".
- Eta_Sagittarii radialV "+0.5".
- Eta_Sagittarii radius "57".
- Eta_Sagittarii uB "+1.71".
- Eta_Sagittarii variable Irregular_variable.
- Eta_Sagittarii subject Category:Bayer_objects.
- Eta_Sagittarii subject Category:F-type_main-sequence_stars.
- Eta_Sagittarii subject Category:Henry_Draper_Catalogue_objects.
- Eta_Sagittarii subject Category:Hipparcos_objects.
- Eta_Sagittarii subject Category:Irregular_variables.
- Eta_Sagittarii subject Category:M-type_giants.
- Eta_Sagittarii subject Category:Multiple_star_systems.
- Eta_Sagittarii subject Category:Sagittarius_(constellation).
- Eta_Sagittarii type Animal100015388.
- Eta_Sagittarii type BayerObjects.
- Eta_Sagittarii type CelestialBody109239740.
- Eta_Sagittarii type F-typeMainSequenceStars.
- Eta_Sagittarii type Giant101323781.
- Eta_Sagittarii type HIPObjects.
- Eta_Sagittarii type HenryDraperCatalogueObjects.
- Eta_Sagittarii type IrregularVariables.
- Eta_Sagittarii type LivingThing100004258.
- Eta_Sagittarii type M-typeGiants.
- Eta_Sagittarii type NaturalObject100019128.
- Eta_Sagittarii type Object100002684.
- Eta_Sagittarii type Organism100004475.
- Eta_Sagittarii type PhysicalEntity100001930.
- Eta_Sagittarii type Star109444100.
- Eta_Sagittarii type Thing100002452.
- Eta_Sagittarii type Variable109468959.
- Eta_Sagittarii type Whole100003553.
- Eta_Sagittarii type CelestialBody.
- Eta_Sagittarii type Star.
- Eta_Sagittarii type PhysicalBody.
- Eta_Sagittarii comment "Eta Sagittarii (Eta Sgr, η Sagittarii, η Sgr) is a binary star system in the southern zodiac constellation of Sagittarius. Based upon parallax measurements, it is located at a distance of 146 light-years (45 parsecs) from Earth. It was formerly known as "Beta Telescopii" (β Tel). In India, where part of the constellation of Sagittarius represents an Elephant, this star forms the creature's tail.The primary component, η Sagittarii A, is a red giant star with a stellar classification of M2 III.".
- Eta_Sagittarii label "Eta Sagittarii".
- Eta_Sagittarii label "Eta Sagittarii".
- Eta_Sagittarii label "Eta Sagittarii".
- Eta_Sagittarii label "Eta Sagittarii".
- Eta_Sagittarii label "Eta Sagittarii".
- Eta_Sagittarii label "Эта Стрельца".
- Eta_Sagittarii label "箕宿四".
- Eta_Sagittarii sameAs Eta_Sagittarii.
- Eta_Sagittarii sameAs Eta_Sagittarii.
- Eta_Sagittarii sameAs Eta_Sagittarii.
- Eta_Sagittarii sameAs Eta_Sagittarii.
- Eta_Sagittarii sameAs Eta_Sagittarii.
- Eta_Sagittarii sameAs m.07v0p8.
- Eta_Sagittarii sameAs Q2522409.
- Eta_Sagittarii sameAs Q2522409.
- Eta_Sagittarii sameAs Eta_Sagittarii.
- Eta_Sagittarii wasDerivedFrom Eta_Sagittarii?oldid=591233178.
- Eta_Sagittarii depiction Sagittarius_IAU.svg.
- Eta_Sagittarii isPrimaryTopicOf Eta_Sagittarii.
- Eta_Sagittarii name "Eta Sagittarii".