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
Mass1.39±0.2[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]

  1. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference araa11_29 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference ibvs3791_1 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference gcsrv was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference an319_6_375 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference halabi was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference npoi was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference aaa61_1_17 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference aj135_1_209 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference simbad was invoked but never defined (see the help page).
  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.
From Wikipedia, the free encyclopedia · View on Wikipedia

Developed by Nelliwinne