η Sagittarii, η Sgr, β Telescopii, β Tel, CCDM J18176-3646AB, CD−36°12423, CPD-36°8128, FK5 683, GC 24944, HD 167618, HIP 89642, HR 6832, IDS 18109-3647 AB, PPM 297508, SAO 209957, WDS J18176-3646AB.[9]
Database references
SIMBAD
data
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.[1] In India, where part of the constellation of Sagittarius represents an Elephant, this star forms the creature's tail.[10]
The primary component, η Sagittarii A, is a red giant star with a stellar classification of M2 III.[3] 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.[11] This star is classified as an oxygen-rich irregular variable,[7] as it undergoes small magnitude fluctuations between +3.08 and 3.12.[4] The measured angular diameter of this star is 11.9 ± 2.1 mas.[12] At the estimated distance of Eta Sagittarii,[1] this yields a physical size of about 57 times the radius of the Sun.[8]
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.[13] 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°.[14] 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.[4]
Within the context of the Milky Way galaxy, this system is a member of the faint old disk group.[7] Because of proper motion, this star will move into constellation Corona Australis around 6300 CE.[15] 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°.[13]
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^Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
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EtaSagittarii (Eta Sgr, η Sagittarii, η Sgr) is a binary star system in the southern zodiac constellation of Sagittarius. Based upon parallax measurements...
consisting of Epsilon Sagittarii, Gamma Sagittarii, Delta Sagittarii and EtaSagittarii. Consequently, the Chinese name for Epsilon Sagittarii itself is 箕宿三 (Jī...
asterism consisting of Gamma Sagittarii, Delta Sagittarii, Epsilon Sagittarii and EtaSagittarii. Consequently, Gamma2 Sagittarii itself is known as 箕宿一 (Jī...
Binary star system 2.65 Upsilon Scorpii Star 2.668 Delta Sagittarii Star 2.68 Beta Lupi Star 2.68 Eta Boötis Binary star system 2.68 Andromeda Galaxy Galaxy...
consisting of Delta Sagittarii, Gamma2 Sagittarii, Epsilon Sagittarii and EtaSagittarii. Consequently, the Chinese name for Delta Sagittarii itself is 箕宿二...
are mentioned as belonging to it: Gamma Sagittarii, Delta Sagittarii, Epsilon Sagittarii and EtaSagittarii. The name is short for Arabic النعامة الواردة...
threw them overboard. Scorpius's tail represents a suckerfish, while EtaSagittarii and Theta Coronae Australis mark the bottom of the canoe. On the island...
brighter stars to neighbouring constellations: Beta Telescopii became EtaSagittarii, which it had been before Lacaille placed it in Telescopium, Gamma was...
direction of Sagittarius. The star has a large mass comparable to V4998 Sagittarii and a luminosity 3.3 million times that of the Sun (L☉). It would be visible...
Considered a candidate LBV, but variability has not been confirmed. V4029 Sagittarii V905 Scorpii HD 6884, (R40 in SMC) HD 269700, (R116 in the LMC) LBV 1806-20...
Sagittarii 11.1° East 3 January 1818 21:52 Venus Jupiter 16.5° West 11 July 1825 09:10 Venus Delta-1 Tauri 44.4° West 11 July 1837 12:50 Mercury Eta Geminorum...
European Space Agency. 560: 931. Bibcode:2005ESASP.560..931S. "Gamma Sagittarii". SIMBAD. Retrieved December 23, 2023. Fracassini, L. E. Pasinetti; Pastori...
near or in the Galactic Center: V4650 Sagittarii (FMM 362 or qF362, in the Quintuplet cluster) V4998 Sagittarii (LBV3, G0.120 0.048, very close to the...
HR 7703 (Gliese 783, 279 G. Sagittarii) is a binary star system in the constellation of Sagittarius. The brighter component has an apparent visual magnitude...
Majoris, one of the largest stars known, together with NML Cygni, VX Sagittarii and Trumpler 27-1 all have radii larger than that of the average orbital...
periods. The majority of these are thought to be first overtone (e.g. X Sagittarii), or higher, pulsators, although some unusual stars apparently pulsating...
dimmer stars (Zeta Leonis, Mu Leonis, Gamma Leonis, Epsilon Leonis, and Eta Leonis) have collectively been called 'the Sickle', which is an asterism...
type B3Ia Lambda Cephei, B-type supergiant, specteal type O6.5I(n)fp Mu Sagittarii, B-type supergiant, spectral type B8Iab(e) 4 Lacertae, B-type supergiant...
stars with over 1 million L☉ and visible to the naked eye: WR 22, WR 24 and Eta Carinae. All of these stars are located in the Carina nebula. Accurate measurement...
appellation Zakariya al-Qazwini had applied to the pair of stars Lambda and Mu Sagittarii; it was often not clear on old star maps which name was intended to go...
fundamental parameters of the red supergiants AH Scorpii, UY Scuti, and KW Sagittarii". Astronomy and Astrophysics. 554: A76. arXiv:1305.6179. Bibcode:2013A&A...
from there at the southern meridian at midnight. Today, the star Sigma Sagittarii is known by the common name Nunki. Canopus was not visible to the mainland...
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