42 Ophiuchi, CD–24 13292, FK5 644, GC 23451, HD 157056, HIP 84970, HR 6453, SAO 185320[11]
Database references
SIMBAD
data
Theta Ophiuchi, Latinized from θ Ophiuchi, is a multiple star system in the equatorial constellation of Ophiuchus. It lies on the "right foot" of the serpent-bearer, just southwest of Kepler's Star, the nova of 1604. According to Richard H. Allen's Star Names: Their Lore and Meaning (1899), θ Oph together with ξ Oph formed the Sogdian Wajrik "the Magician", the Khorasmian Markhashik "the Serpent-bitten" and with η Oph the Coptic Tshiō, "the Snake", and Aggia, "the Magician".[12] This star has an apparent visual magnitude of +3.3,[6] making it readily visible to the naked eye. Based upon parallax measurements from the Hipparcos mission, it is roughly 436 light-years (134 parsecs) from Earth.[1] It is 1.8 degrees south of the ecliptic and therefore subject to lunar occultations and less frequently occulted by a planet.
Theta Ophiuchi appears to be a triple star system. The brightest component is a spectroscopic binary with an orbital period of 56.71 days and an eccentricity of 0.17. The third component is 5.5 magnitude star with a stellar classification of B5. Its angular separation from the binary pair is 0.15 arcseconds.[13] This system is a proper motion member of the Upper Scorpius sub-group in the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun.[6]
The primary component of this system is a variable star of the Beta Cephei type with a period of just 3h 22m.[15] It has nearly nine[3] times the mass of the Sun and more than six[7] times the Sun's radius. Although only 21 million years old,[3] it has begun to evolve away from the main sequence and has become a subgiant star with a stellar classification of B2 IV.[3] This massive star is radiating around 5,000 times the luminosity of the Sun from its outer atmosphere at an effective temperature of about 22,260 K,[8] giving it the blue-white hue of a B-type star.[16]
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ThetaOphiuchi, Latinized from θ Ophiuchi, is a multiple star system in the equatorial constellation of Ophiuchus. It lies on the "right foot" of the...
rotation. Eta Ophiuchi is a binary system. Other bright stars in the constellation include β Ophiuchi, Cebalrai ("dog of the shepherd") and λ Ophiuchi, or Marfik...
Eta Ophiuchi (η Ophiuchi, abbreviated Eta Oph, η Oph) is a binary star in the constellation of Ophiuchus. Based on parallax measurements taken during the...
Star 2.05 Theta Centauri Star 2.06 2.02 Alpheratz Binary star system 2.06 2.04 Saiph Star 2.067 Sigma Sagittarii Star 2.07 Alpha Ophiuchi Binary star...
resolvable into countless stars". The cluster is located 4.5° WSW of ThetaOphiuchi and is just visible as a fuzzy point of light using 50 mm (2.0 in) binoculars...
East 3 July 1989 Saturn 28 Sagittarii 4 December 2015 16:14 Mercury ThetaOphiuchi 9.6° East 17 February 2035 15:19 Venus Pi Sagittarii 42.1° West 1 October...
consisting of Theta Serpentis, Delta Herculis, Lambda Herculis, Mu Herculis, Omicron Herculis, 112 Herculis, Zeta Aquilae, Eta Serpentis, Nu Ophiuchi, Xi Serpentis...
has the Bayer designation d Ophiuchi, while 45 Ophiuchi is the Flamsteed designation. In the past it had the designation Theta Telescopii. This object is...
numerous but far less luminous. Examples: Pollux, a K-type giant. Epsilon Ophiuchi, a G-type red giant. Arcturus (α Boötis), a K-type giant. Gamma Comae Berenices...
Celbalrai Kalb ur-Rāʿī the Shepherd's Dog كلب الراعي Beta Ophiuchi Chort al-Kharat the Rib الخرت Theta Leonis Cursa Kursiyy al-Jauzah the Chair or Footstool...
bow-shocks are: Most of them belong to the Scorpius–Centaurus association and Theta Carinae, which is the brightest star of IC 2602, might also belong to the...
from the Arabic الراعي (ar-rā‘ī), meaning 'the shepherd'. (The star Beta Ophiuchi is sometimes also called Alrai, but it is more commonly known as Cebalrai...
in Scorpius and renamed G Scorpii by Gould, Theta Telescopii reverted to its old appellation of d Ophiuchi, and Sigma Telescopii was placed in Corona Australis...
near the boundary with Auriga, 49 arcminutes away from the bright star Theta Geminorum; due to its apparent magnitude of +9.89 it cannot be observed...
Star of Left Wall Eta Ophiuchi Sabik 宋 Sòng The state of Song 天市右垣九 Tiān Shì Yòu Yuán jiǔ the Ninth Star of Right Wall Delta Ophiuchi Yed Prior 梁 Liáng The...
seen. It is located in the constellation of Scorpius, near the bright star Theta Scorpii. The star is in a crowded region of sky near the Galactic Center...
Delta, Lambda, Mu, Omicron and 112 Herculis; Theta¹ and Eta Serpentis; Nu Ophiuchi, Xi Serpentis and Eta Ophiuchi. Consequently, the Chinese name for Zeta...