Sigma Ophiuchi

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σ Ophiuchi
Location of σ Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 17h 26m 30.8806s[1]
Declination +04° 08′ 25.2876″[1]
Apparent magnitude (V) 4.31[2] (4.25 - 4.51[3])
Characteristics
Spectral type K2 III[4]
U−B color index +1.57[2]
B−V color index +1.51[2]
Variable type suspected[3]
Distance
870 ± 40 ly
(270 ± 10 pc)
Absolute magnitude (MV)−2.85[7]
Details
Rotational velocity (v sin i)
4.2[10] km/s
HR 6498, SAO 122387, 2MASS
J17263087+0408252
Database references
SIMBADdata

Sigma Ophiuchi,

light years. It is moving closer to the Sun with a radial velocity of −28 km/s.[5]

This is an

Sun's luminosity from its enlarged photosphere at an effective temperature of 4,130 K.[8]

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    Bibcode:2002yCat.2237....0D
    .
  3. ^
    Bibcode:2009yCat....102025S
    .
  4. ^
    Bibcode:1999MSS...C05....0H
    .
  5. ^
    S2CID 17804304
    .
  6. ^
    doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR
    .
  7. S2CID 119257644. Vizier catalog entry
  8. ^
    S2CID 55679854
    , A9.
  9. S2CID 59334290. Vizier catalog entry
  10. doi:10.1051/aas:1999401. Vizier catalog entry
  11. S2CID 14878976
    .
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