Yed Prior - δ Ophiuchi (delta Ophiuchi)
Yed Prior, also designated as δ Ophiuchi (delta Ophiuchi), is a variable and double hypergiant star in the constellation of Ophiuchus.
Yed Prior visual magnitude is 2.74. Thanks to its high brightness, Yed Prior is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.
The table below summarizes the key facts about Yed Prior:
Celestial coordinates and finder chart of Yed Prior
Yed Prior 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 Prior are provided in the following table:
The simplified sky map below shows the position of Yed Prior in the sky:
Visibility of Yed Prior from your location
Today's Yed Prior - δ Ophiuchi (delta Ophiuchi) rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):
Digitized Sky Survey image of Yed Prior
The image below is a photograph of Yed Prior 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 Prior is -0.044 arcsec per year in Right Ascension and -0.143 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.
Distance of Yed Prior from the Sun and relative movement
Yed Prior is distant 170.15 light years from the Sun and it is moving towards the Sun at the speed of 20 kilometers per second.
Spectral properties of Yed Prior
Yed Prior belongs to spectral class M0 and has a luminosity class of III corresponding to a hypergiant star.
The red dot in the diagram below shows where Yed Prior is situated in the Hertzsprung–Russell diagram.
Yed Prior star system properties
Yed Prior 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 Prior double sysyem: