Delta Ophiuchi (δ Oph / δ Ophiuchi) is a star in the constellationOphiuchus. It also has the traditional name Yed Prior (and the star Epsilon Ophiuchi, with which it forms a naked eyeoptical double, is Yed Posterior). 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 Epsilon Ophiuchi (ε Oph / ε 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. ...
Delta Ophiuchi is 170 light years from Earth (while Epsilon is 108, hence they are a mere optical double). It is a red giant (class M), temperature 4850 K. 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. ... According to the Hertzsprung-Russell diagram, a red giant is a large non-main sequence star of stellar classification K or M; so-named because of the reddish appearance of the cooler giants. Examples include Aldebaran and Arcturus. ... The title of this article is incorrect due to technical limitations. ...
12 Ophiuchi is located about 31.9 light-years (ly) away from our Sun, Sol, within the east central corner (16:36:21.4-2:19:28.5, ICRS 2000.0) of ConstellationOphiuchus, the Serpent Holder or Snake Charmer -- near Yed Prior (DeltaOphiuchi) and Yed Posterior (Epsilon Ophiuchi), and south of Marfik (Lamda Ophiuchi) and north of Zeta Ophiuchi.
The SIMBAD Astronomical Database identifies 12 Ophiuchi as a BY Draconis-type variable star -- whose variability is attributed to stellar rotation in which starspots covering a significant fraction of the stellar surface rotate in and out of the field of view -- with the designation of V2133 Ophiuchi.
On the other hand, the distance from 12 Ophiuchi where an Earth-type planet would be "comfortable" with liquid water is centered around only 0.64 AU -- inside the orbital distance of Venus in the Solar System -- where a planet probably would have an orbital period around half an Earth year.
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