Omega Ophiuchi

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Omega Ophiuchi
Location of ω Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation
Ophiuchus
Right ascension 16h 32m 08.19983s[1]
Declination −21° 27′ 59.0120″[1]
Apparent magnitude (V) 4.45[2] (4.44 – 4.51)[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type ApSrEuCr[5] or A2 Vp(SrCrEu st, K sn)[4]
U−B color index +0.13[6]
B−V color index +0.130±0.002[2]
Variable type α2 CVn[3]
Distance
169 ± 2 ly
(51.7 ± 0.6 pc)
Absolute magnitude (MV)0.88[2]
Details
Myr
HR 6153, SAO 184450[11]
Database references
SIMBADdata

Omega Ophiuchi, which is

light years from the Sun.[1] It is drifting further away with a radial velocity of +2.5 km/s.[7]

This object is an

Ca II line (single-ionized calcium) having both sharp and broad components. It is an Alpha2 Canum Venaticorum variable, with its brightness ranging from magnitude 4.44 down to 4.51 over a period of 2.99 days.[3] A strong magnetic field has been measured on the surface.[10]

Omega Ophiuchi is around 860 million years old with a

luminosity of the Sun from its photosphere at an effective temperature of 8,150 K.[8] It is a source of X-ray emission.[13]

References

  1. ^
    S2CID 18759600. Vizier catalog entry
  2. ^
    S2CID 119257644. Vizier catalog entry
  3. ^
    S2CID 125853869
    .
  4. ^
    doi:10.1086/192182
    .
  5. ^
    Bibcode:1988mcts.book.....H
    .
  6. Bibcode:2002yCat.2237....0D
    .
  7. ^
    S2CID 119231169
    .
  8. ^
    S2CID 119089236
    .
  9. S2CID 119258214
    .
  10. ^
    S2CID 119415579
    .
  11. ^ "ome Oph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-28.
  12. S2CID 14878976
    .
  13. Bibcode:2008CoSka..38..447S
    .
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