Back مقدم يد الحواء (نجم) Arabic Yed Prior AST Yed Prior Catalan Delta Ophiuchi German Yed Prior Spanish دلتا مارافسای Persian Delta Ophiuchi French יד פריור HE Delta Ophiuchi ID Delta Ophiuchi Italian

Delta Ophiuchi

δ Ophiuchi
Location of δ Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 16h 14m 20.73853s[1]
Declination –03° 41′ 39.5612″[1]
Apparent magnitude (V) 2.75[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M0.5 III[4]
U−B color index +1.96[2]
B−V color index +1.59[2]
Variable type Suspected[5]
Astrometry
Radial velocity (Rv)–19.9[6] km/s
Proper motion (μ) RA: –47.54[1] mas/yr
Dec.: –142.73[1] mas/yr
Parallax (π)19.06 ± 0.16 mas[1]
Distance171 ± 1 ly
(52.5 ± 0.4 pc)
Absolute magnitude (MV)–0.90[7]
Details
Mass1.5[8] M☉
Radius53.5+1.38
−1.46[9] R☉
Luminosity502±27[9] L☉
Surface gravity (log g)1.4[10] cgs
Temperature3733±5[9] K
Metallicity [Fe/H]0.32[10] dex
Rotational velocity (v sin i)7.0[11] km/s
Other designations
1 Oph, BD-03 3903, FK5 603, HD 146051, HIP 79593, HR 6056, SAO 141052.[12]
Database references
SIMBADdata

Delta Ophiuchi (δ Ophiuchi, abbreviated Delta Oph, δ Oph), formally named Yed Prior /ˌjɛd ˈpraɪər/,[13][14] is a star in the constellation of Ophiuchus. It forms a naked-eye optical double with Epsilon Ophiuchi (named Yed Posterior[14]). The apparent visual magnitude is 2.75,[2] 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)).[1]

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  13. ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  14. ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.

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