Yed Posterior - ε Ophiuchi (epsilon Ophiuchi)
Yed Posterior, also designated as ε Ophiuchi (epsilon Ophiuchi), is a double giant star in the constellation of Ophiuchus.
Yed Posterior visual magnitude is 3.24. Because of its moderate brightness, Yed Posterior should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.
The table below summarizes the key facts about Yed Posterior:
Celestial coordinates and finder chart of Yed Posterior
Yed Posterior is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Yed Posterior are provided in the following table:
The simplified sky map below shows the position of Yed Posterior in the sky:
Visibility of Yed Posterior from your location
Digitized Sky Survey image of Yed Posterior
The image below is a photograph of Yed Posterior from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of Yed Posterior is 0.085 arcsec per year in Right Ascension and 0.041 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.
Distance of Yed Posterior from the Sun and relative movement
Yed Posterior is distant 107.45 light years from the Sun and it is moving towards the Sun at the speed of 10 kilometers per second.
Spectral properties of Yed Posterior
Yed Posterior belongs to spectral class G9 and has a luminosity class of III corresponding to a giant star.
The red dot in the diagram below shows where Yed Posterior is situated in the Hertzsprung–Russell diagram.
Yed Posterior star system properties
Yed Posterior is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the Yed Posterior double sysyem: