70 Ophiuchi

This article is about p Ophiuchi. Not to be confused with ρ (Rho) Ophiuchi.
70 Ophiuchi
Location of 70 Ophiuchi in the constellation Ophiuchus
Observation data
Epoch J2000      Equinox
Constellation Ophiuchus
70 Ophiuchi
Right ascension 18h 05m 27.285s[1]
Declination +02° 29′ 00.36″[1]
Apparent magnitude (V) 4.00 - 4.03[2]
A
Right ascension 18h 05m 27.371s[3]
Declination +02° 29′ 59.32″[3]
Apparent magnitude (V) 4.13[3]
B
Right ascension 18h 05m 27.462s[4]
Declination +02° 29′ 56.22″[4]
Apparent magnitude (V) 6.07[3]
Characteristics
Spectral type K0V + K4V[5]
Apparent magnitude (B) 4.97/7.26[3]
Apparent magnitude (R) 3.6/5.6[3]
U−B color index +0.69[6]
B−V color index +0.84/+1.19[3]
Variable type BY Dra[7] or RS CVn[2]
Astrometry
70 Oph A
Radial velocity (Rv)−6.87[8] km/s
Proper motion (μ) RA: 206.525±0.246[9] mas/yr
Dec.: −1107.492±0.164[9] mas/yr
Parallax (π)195.5674 ± 0.1964 mas[9]
Distance16.68 ± 0.02 ly
(5.113 ± 0.005 pc)
Absolute magnitude (MV)+5.49[10]
70 Oph B
Proper motion (μ) RA: 333.292±0.264[11] mas/yr
Dec.: −1068.354±0.215[11] mas/yr
Parallax (π)195.2166 ± 0.1012 mas[12]
Distance16.707 ± 0.009 ly
(5.123 ± 0.003 pc)
Orbit[8]
Period (P)88.38±0.017 yr
Semi-major axis (a)4.554±0.0052″
Eccentricity (e)0.4992±0.00039
Inclination (i)121.16±0.078°
Longitude of the node (Ω)302.12±0.097°
Periastron epoch (T)1895.94
Argument of periastron (ω)
(secondary)		14.0±0.14°
Details
70 Oph A
Mass0.90 ± 0.04[13] M☉
Radius0.91 ± 0.03[14] R☉
Luminosity (bolometric)0.59 ± 0.02[14] L☉
Surface gravity (log g)4.5[15] cgs
Temperature5,300[15] K
Metallicity [Fe/H]+0.04[16] dex
Rotation19.7 days[16]
Age1.9[17] Gyr
70 Oph B
Mass0.70 ± 0.07[13] M☉
Luminosity (bolometric)0.13 ± 0.03[13] L☉
Temperature4,350 ± 150[13] K
Other designations
p Ophiuchi, V2391 Ophiuchi, BD+02 3482, Gl 702, HD 165341, HIP 88601, HR 6752, PLX 4137
70 Oph A: LHS 458
70 Oph B: LHS 459
Database references
SIMBADThe system
A
B
Exoplanet Archivedata
ARICNSdata

70 Ophiuchi is a binary star system located 16.6 light years away from the Earth. It is in the constellation Ophiuchus. At magnitude 4 it appears as a dim star visible to the unaided eye away from city lights.

  1. ^ a b Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
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  9. ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  10. ^ Cite error: The named reference Holmberg2009 was invoked but never defined (see the help page).
  11. ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  12. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  13. ^ a b c d Cite error: The named reference aaa338 was invoked but never defined (see the help page).
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