20 Ophiuchi

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20 Ophiuchi
Location of 20 Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation
Ophiuchus
Right ascension 16h 49m 50.01604s[1]
Declination −10° 46′ 58.7775″[1]
Apparent magnitude (V) 4.64[2]
Characteristics
Spectral type F6IV[3]
U−B color index +0.07[4]
B−V color index +0.47[4]
Distance
104 ± 7 ly
(32 ± 2 pc)
Absolute magnitude (MV)2.13[2]
Argument of periastron
(ω)
(secondary)		34 ± 26°
Details
20 Oph A
Rotational velocity (v sin i)
11.3[9] km/s
20 Oph B
Mass0.8 ± 0.2[6] M☉
SAO
 160118
Database references
SIMBADdata

20 Ophiuchi is a class F6IV

Ophiuchus. Its apparent magnitude is 4.64[2] and it is approximately 104 light years away based on parallax.[1]
It lies near the star Zeta Ophiuchi.

20 Ophiuchi is an

barycenter. From this, an orbital period of 35.5 years has been calculated. The secondary star is 0.8 times the mass of the Sun, and it may be a white dwarf or red dwarf.[6]

References

  1. ^
    S2CID 18759600. Vizier catalog entry
  2. ^
    S2CID 119257644. Vizier catalog entry
  3. ^
    S2CID 119476992
    .
  4. ^
    Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  5. S2CID 119231169
    .
  6. ^
    doi:10.1016/j.newast.2009.09.006
    .
  7. ^
    Bibcode:1999A&A...352..555A. Vizier catalog entry
  8. ^
    S2CID 53480665
    .
  9. doi:10.1051/aas:1999401. Vizier catalog entry
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