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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.
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]).
Nu Ophiuchi and its brown dwarf companion Nu Ophiuchi b. Nu Ophiuchi has about three times the mass of the Sun and is roughly 450 million years old. [4] 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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Epsilon Ophiuchi or ε Ophiuchi, formally named Yed Posterior (/ ˌ j ɛ d p ɒ ˈ s t ɪər i ər /), [12] [13] is a red giant [7] star in the constellation of Ophiuchus.Located less than five degrees south of the celestial equator in the eastern part of the constellation, [1] it forms a naked eye optical double with Delta Ophiuchi (named Yed Prior [13]).
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.
λ Ophiuchi, Latinized as Lambda Ophiuchi, is a triple star system [3] in the equatorial constellation of Ophiuchus. [10] It has the traditional name Marfik / ˈ m ɑːr f ɪ k /, [11] which now applies exclusively to the primary component. [12] The system is visible to the naked eye as a faint point of light with an apparent visual magnitude ...