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Ophiuchus (/ ˌ ɒ f i ˈ juː k ə s /) is a large constellation straddling the celestial equator. Its name comes from the Ancient Greek ὀφιοῦχος ( ophioûkhos ), meaning "serpent-bearer", and it is commonly represented as a man grasping a snake.
Nu Ophiuchi and its brown dwarf companion Nu Ophiuchi b. Nu Ophiuchi has about three times the mass of the Sun and is roughly 340 million years old. [6] The spectrum of the star matches a stellar classification of K0 IIIa, [3] indicating it is a giant star that has exhausted the supply of hydrogen at its core and evolved away from the main sequence of stars.
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Delta Ophiuchi (δ Ophiuchi, abbreviated Delta Oph, δ Oph), formally named Yed Prior / ˌ j ɛ d ˈ p r aɪ ər /, [13] [14] is a star in the constellation of Ophiuchus.It forms a naked-eye optical double with Epsilon Ophiuchi (named Yed Posterior [14]).
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.
44 Ophiuchi is a single [10] star in the constellation Ophiuchus.It has the Bayer designation b Ophiuchi, while 44 Ophiuchi is the Flamsteed designation.It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.16. [2]
The brighter member of this pair, designated component A, is the primary for the system with a visual magnitude of 4.18 [3] and a stellar classification of A0V. [4] The secondary, component B, is magnitude 5.22 [3] and class A4V. [4] Component C is magnitude 11.0 and lies at an angular separation of 119″ from the inner pair. [3]
Chi Ophiuchi, Latinized from χ Ophiuchi, is a variable star in the equatorial constellation of Ophiuchus. [13] It has a blue-white hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 4.22. [3]