Upsilon Ophiuchi

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Upsilon Ophiuchi
Location of υ Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation
Ophiuchus
Right ascension 16h 27m 48.18720s[1]
Declination −8° 22′ 18.2245″[1]
Apparent magnitude (V) 4.62[2]
Characteristics
Spectral type kA2hA5VmA5[3]
U−B color index +0.06[4]
B−V color index +0.16[4]
Distance
134 ± 5 ly
(41 ± 2 pc)
Absolute magnitude (MV)1.75[2]
Semi-amplitude
(K1)
(primary)		34.9±0.3 km/s
Semi-amplitude (K2)
(secondary)		41.1±0.3 km/s
Argument of periastron
(ω)
(secondary)		177.9±7.4°
Details
Rotational velocity (v sin i)
44[10] km/s
HR 6129, SAO 141187, CCDM J16278-0822AB, WDS J16278-0822[11]
Database references
SIMBADdata

Upsilon Ophiuchi is a

light years based on parallax.[1] It is drifting closer with a radial velocity of −30.6 km/s.[5]

The variable radial velocity of the brighter component was first observed by

Am stars.[3] The third component has an 82.8 year orbit with the inner pair at an eccentricity of 0.45.[7] The system is a source for X-ray emission.[13]

References

  1. ^
    S2CID 18759600. Vizier catalog entry
  2. ^
    S2CID 119257644. Vizier catalog entry
  3. ^
    doi:10.1086/192182
    .
  4. ^
    Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  5. ^
    LCCN 54001336
    .
  6. ^
    Bibcode:1965PDAO...12..391G
    .
  7. ^ a b "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 24 May 2017.
  8. ^
    Bibcode:1999A&A...352..555A. Vizier catalog entry
  9. ^
    S2CID 33401607. Vizier catalog entry
  10. Bibcode:1995yCat.5050....0H
    .
  11. ^ "ups Oph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-21.{{cite web}}: CS1 maint: postscript (link)
  12. S2CID 14878976. Vizier catalog entry
  13. doi:10.1051/0004-6361:20077429
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