Epsilon Ophiuchi (ε Oph / ε Ophiuchi) is a star in the constellation Ophiuchus. It also has the traditional name Yed Posterior (and the star Delta Ophiuchi, with which it forms a naked eye optical double, is Yed Prior). The Pleiades star cluster A star is a massive body of plasma in outer space that is currently producing or has produced energy through nuclear fusion. ... -1... Ophiuchus (known as the serpent holder) is one of the 88 constellations, and was also one of the 48 listed by Ptolemy. ... Jump to: navigation, search Delta Ophiuchi (δ Oph / δ Ophiuchi) is a star in the constellation Ophiuchus. ... A naked eye is a figure of speech, referring to human eyes unaided by enhancing equipment such as a telescope or binoculars. ... Double Star is a science fiction novel by Robert A. Heinlein. ...

The traditional name Yed is derived from Arabic meaning "the hand", and the two stars are the left hand of Ophiuchus (the Serpent Bearer) that holds the head of the serpent Serpens Caput. Arabic (العربية al-arabiyyah, or less formally arabi) is the largest member of the Semitic branch of the Afro-Asiatic language family (classification: South Central Semitic) and is closely related to Hebrew and Aramaic. ... Serpens (the snake) is one of the 88 modern constellations, and was also one of the 48 listed by Ptolemy. ...

Epsilon Ophiuchi is 108 light years from Earth (while Delta is 170, hence they are a mere optical double). It is a class G giant, which, unusually for such stars, is cyanogen-deficient and carbon-deficient. A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... Jump to: navigation, search Earth, also known as the Earth, Terra, and (mostly in the 19th century) Tellus, is the third-closest planet to the Sun. ...

References

• Jim Kaler. Yed Posterior. STARS. Accessed on July 22, 2005.