Back Alpha Ophiuchi Afrikaans رأس الحواء Arabic Ras Alhague AST Rasalhague Catalan Ras Alhague Czech Ras Alhague German Ρας Αλχάγκ Greek Ras Alhague Spanish آلفا مارافسای Persian Alfa Ophiuchi Finnish

Alpha Ophiuchi

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[7]
Period (P)3,139.72±0.28 days
Semi-major axis (a)409.8±0.3 mas
Eccentricity (e)0.93912±0.00013
Inclination (i)130.679±0.067°
Longitude of the node (Ω)236.86±0.16°
Periastron epoch (T)2,456,028.2 JD
Argument of periastron (ω)
(secondary)		170.21±0.23°
Semi-amplitude (K1)
(primary)		12.7±0.2 km/s
Semi-amplitude (K2)
(secondary)		33.74±0.35 km/s
Details
α Oph A
Mass2.20±0.06[7] M☉
Radius2.858±0.015 R☉ (equatorial)
2.388±0.013 (polar)[8] R☉
Luminosity31.3±0.96[8] L☉
Surface gravity (log g)3.91[9] cgs
Temperature7,569±124 K (equatorial)
9,384±154 (polar)[8] K
Rotation0.61[8] days
Rotational velocity (v sin i)239±12[8] km/s
Age0.77±0.03[10] Gyr
α Oph B
Mass0.824±0.023[7] M☉
Other designations
Ras Alhague, Rasalhague, 55 Ophiuchi, BD+12°3252, FK5 656, HD 159561, HIP 86032, HR 6556, SAO 102932.[11]
Database references
SIMBADdata

Alpha Ophiuchi (α Ophiuchi, abbreviated Alpha Oph, α Oph), also named Rasalhague /ˈræsəlheɪɡ/,[12][13] is a binary star and the brightest star in the constellation of Ophiuchus.

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  7. ^ a b c Cite error: The named reference Gardner2021 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference monnier was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aass85_3_1015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference apj701_1_209 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ also /-ˈheɪɡjuː/ or /-ˈheɪɡwiː/.
    "Rasalhague". Merriam-Webster.com Dictionary. Merriam-Webster.
  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.

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