Yed Prior Delta Ophiuchi

Stellar classification



  • X -23
  • Y 90
  • Z 144
→ Sol: 171

Object type

  • Variable Star
  • Star
  • Double or multiple star
  • Infra-Red source
  • UV-emission source
simbad:* del Oph


Delta Ophiuchi (δ Ophiuchi, abbreviated Delta Oph, δ Oph), also named Yed Prior, is a star in the constellation of Ophiuchus. It forms a naked eye optical double with Epsilon Ophiuchi (named Yed Posterior). The apparent visual magnitude is 2.75, making this a third-magnitude star and the fourth-brightest in the constellation. Parallax measurements from the Hipparcos spacecraft yield a distance estimate of approximately 171 light-years (52 parsecs) from the Sun (Epsilon Ophiuchi is approximately 108 light-years (33 parsecs)).

This article uses material from the Wikipedia article "Delta Ophiuchi", which is released under the Creative Commons Attribution-Share-Alike License 3.0.