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Alpha Ophiuchi information


α Ophiuchi
Location of α Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 17h 34m 56.06945s[1]
Declination +12° 33′ 36.1346″[1]
Apparent magnitude (V) 2.07[2]
Characteristics
Spectral type A5IVnn[3] / K5–7 V[4]
U−B color index +0.10[2]
B−V color index +0.15[2]
Astrometry
Radial velocity (Rv)+12.6[5] km/s
Proper motion (μ) RA: 108.07[1] mas/yr
Dec.: -221.57[1] mas/yr
Parallax (π)67.13 ± 1.06 mas[1]
Distance48.6 ± 0.8 ly
(14.9 ± 0.2 pc)
Absolute magnitude (MV)+1.248[6]
Orbit[4]
Period (P)3,148.4 days
Semi-major axis (a)427+20
−13
 mas
Eccentricity (e)0.92±0.03
Inclination (i)125+6
−9
°
Longitude of the node (Ω)232±9°
Periastron epoch (T)2,452,888±53 JD
Argument of periastron (ω)
(secondary)
162±14°
Details
α Oph A
Mass2.40+0.23
−0.37
[4] M
Radius2.6[7] R
Luminosity25.1–25.6[8] L
Surface gravity (log g)3.91[7] cgs
Temperature7,8808,050[8] K
Rotational velocity (v sin i)240[8] km/s
Age0.77±0.03[9] Gyr
α Oph B
Mass0.85+0.06
−0.04
[4] M
Other designations
Ras Alhague, Rasalhague, 55 Ophiuchi, BD+12° 3252, FK5 656, HD 159561, HIP 86032, HR 6556, SAO 102932.[10]
Database references
SIMBADdata

Alpha Ophiuchi (α Ophiuchi, abbreviated Alpha Oph, α Oph), also named Rasalhague /ˈræsəlhɡ/,[11][12] is a binary star and the brightest star in the constellation of Ophiuchus.

  1. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference clpl4 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference :0 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference apj726_2_104 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference rgcrv was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Gatewood2005 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference aass85_3_1015 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference apj742_1_9 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference apj701_1_209 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ also /-ˈhɡjuː/ or /-ˈhɡw/.
    "Rasalhague". Merriam-Webster.com Dictionary.
  12. ^ 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.

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Gatewood, George (2005-08-01). "An Astrometric Study of the Binary Star α Ophiuchi". The Astronomical Journal. 130 (2): 809–814. Bibcode:2005AJ....130..809G...

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