36 Ophiuchi

36 Ophiuchi
	36 Location of 36 Ophiuchi in the constellation Ophiuchus;
Observation data; Epoch J2000 Equinox J2000
Constellation	Ophiuchus
Right ascension	A: 17h 15m 20.851s; B: 17h 15m 20.978s; C: 17h 16m 13.3624s
Declination	A: −26° 36′ 09.04″; B: −26° 36′ 10.18″; C: −26° 32′ 46.129″
Apparent magnitude (V)	5.08/5.03/6.34
Characteristics
Spectral type	K2 V/K1 V/K5 V
U−B color index	0.51(AB)/1.04
B−V color index	0.85(AB)/1.16
Variable type	C: RS CVn
Astrometry
36 Oph A
Radial velocity (Rv)	−0.6 km/s
Proper motion (μ)	RA: −498.600 mas/yr ; Dec.: −1,149.158 mas/yr
Parallax (π)	168.0031 ± 0.1343 mas
Distance	19.41 ± 0.02 ly ; (5.952 ± 0.005 pc)
36 Oph B
Radial velocity (Rv)	0.0 km/s
Proper motion (μ)	RA: −465.861 mas/yr ; Dec.: −1,141.168 mas/yr
Parallax (π)	168.1303 ± 0.1081 mas
Distance	19.40 ± 0.01 ly ; (5.948 ± 0.004 pc)
36 Oph C
Radial velocity (Rv)	−0.04±0.22 km/s
Proper motion (μ)	RA: −479.573 mas/yr ; Dec.: −1,124.332 mas/yr
Parallax (π)	167.9617 ± 0.0311 mas
Distance	19.418 ± 0.004 ly ; (5.954 ± 0.001 pc)
Orbit
Companion	36 Ophiuchi B
Period (P)	470.9 yr
Semi-major axis (a)	13″
Eccentricity (e)	0.916
Inclination (i)	99.8°
Details
36 Oph A
Mass	0.75+0.02; −0.04 M☉
Radius	0.817±0.016 R☉
Luminosity	0.326±0.084 L☉
Temperature	5,103±29 K
Metallicity [Fe/H]	−0.23 dex
Age	4.86+0.50; −0.22 Gyr
36 Oph B
Mass	0.76+0.03; −0.06 M☉
Radius	0.709 R☉
Luminosity	0.32 L☉
Surface gravity (log g)	4.61 cgs
Temperature	5,171±71 K
Metallicity [Fe/H]	−0.22 dex
Age	5.26+5.04; −2.94 Gyr
Other designations
	36 Oph, WDS J17153-2636
	AB: GJ 663, CD−26°12026, GCTP 3908.00, HIP 84405
	A: Guniibuu, HR 6402, HD 155886, LHS 437, SAO 185198
	B: HR 6401, HD 155885, LHS 438, SAO 185199
	C: V2215 Ophiuchi, GJ 664, CD−26°12036, HD 156026, GCTP 3913.00, LHS 439, SAO 185213, HIP 84478
Database references
SIMBAD	AB
	A
	B
	C
Exoplanet Archive	A
	B
	C
ARICNS	A
	B
	C

36 Ophiuchi (or Guniibuu for component A) is a triple star system 19.5 light-years from Earth in the constellation Ophiuchus.

^ ^a ^b ^c ^d ^e ^f
"SIMBAD Astronomical Database". Centre de Données astronomiques de Strasbourg. Retrieved 2013-08-23.
^ ^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.
^ ^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.
^ ^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.
^ Cite error: The named reference Tokovinin2017 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference Luck2017 was invoked but never defined (see the help page).
^ Cite error: The named reference aaa505_1_205 was invoked but never defined (see the help page).
^ Cite error: The named reference Hardegree-Ullman2023 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference Luck2018 was invoked but never defined (see the help page).

Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).

[SIMBAD-1] ^ ^a ^b ^c ^d ^e ^f "SIMBAD Astronomical Database". Centre de Données astronomiques de Strasbourg. Retrieved 2013-08-23.

A: LHS 437 -- High proper-motion Star

B: LHS 438 -- High proper-motion Star

C: V* V2215 Oph -- Variable of RS CVn type

[2] A: LHS 437 -- High proper-motion Star

[3] B: LHS 438 -- High proper-motion Star

[4] C: V* V2215 Oph -- Variable of RS CVn type

[GaiaEDR3a-2] 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.

[GaiaEDR3b-3] 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.

[GaiaEDR3c-4] 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.

[Tokovinin2017-5] Cite error: The named reference Tokovinin2017 was invoked but never defined (see the help page).

[Luck2017-6] Cite error: The named reference Luck2017 was invoked but never defined (see the help page).

[aaa505_1_205-7] Cite error: The named reference aaa505_1_205 was invoked but never defined (see the help page).

[Hardegree-Ullman2023-8] Cite error: The named reference Hardegree-Ullman2023 was invoked but never defined (see the help page).

[Luck2018-9] ^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference Luck2018 was invoked but never defined (see the help page).

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[a]

Observation data Epoch J2000 Equinox J2000
36 Location of 36 Ophiuchi in the constellation Ophiuchus
Constellation	Ophiuchus
Right ascension	A: 17^h 15^m 20.851^s B: 17^h 15^m 20.978^s C: 17^h 16^m 13.3624^s^[1]
Declination	A: −26° 36′ 09.04″ B: −26° 36′ 10.18″ C: −26° 32′ 46.129″^[1]
Apparent magnitude (V)	5.08/5.03/6.34^[1]
Characteristics
Spectral type	K2 V/K1 V/K5 V^[1]
U−B color index	0.51(AB)/1.04
B−V color index	0.85(AB)/1.16
Variable type	C: RS CVn
Astrometry
36 Oph A
Radial velocity (R_v)	−0.6^[1] km/s
Proper motion (μ)	RA: −498.600 mas/yr^[2] Dec.: −1,149.158 mas/yr^[2]
Parallax (π)	168.0031 ± 0.1343 mas^[2]
Distance	19.41 ± 0.02 ly (5.952 ± 0.005 pc)
36 Oph B
Radial velocity (R_v)	0.0^[1] km/s
Proper motion (μ)	RA: −465.861 mas/yr^[3] Dec.: −1,141.168 mas/yr^[3]
Parallax (π)	168.1303 ± 0.1081 mas^[3]
Distance	19.40 ± 0.01 ly (5.948 ± 0.004 pc)

36 Oph C
Radial velocity (R_v)	−0.04±0.22^[4] km/s
Proper motion (μ)	RA: −479.573 mas/yr^[4] Dec.: −1,124.332 mas/yr^[4]
Parallax (π)	167.9617 ± 0.0311 mas^[4]
Distance	19.418 ± 0.004 ly (5.954 ± 0.001 pc)

Orbit^[5]
Companion	36 Ophiuchi B
Period (P)	470.9 yr
Semi-major axis (a)	13″
Eccentricity (e)	0.916
Inclination (i)	99.8°
Details
36 Oph A
Mass	0.75+0.02 −0.04^[6] `M`_☉
Radius	0.817±0.016^[7] `R`_☉
Luminosity	0.326±0.084^[8] `L`_☉
Temperature	5,103±29^[6] K
Metallicity [Fe/H]	−0.23^[6] dex
Age	4.86+0.50 −0.22^[6] Gyr
36 Oph B
Mass	0.76+0.03 −0.06^[9] `M`_☉
Radius	0.709^[9]^[a] `R`_☉
Luminosity	0.32^[9] `L`_☉
Surface gravity (log g)	4.61^[9] cgs
Temperature	5,171±71^[9] K
Metallicity [Fe/H]	−0.22^[9] dex
Age	5.26+5.04 −2.94^[9] Gyr
Other designations
36 Oph, WDS J17153-2636
AB: GJ 663, CD−26°12026, GCTP 3908.00, HIP 84405
A: Guniibuu, HR 6402, HD 155886, LHS 437, SAO 185198
B: HR 6401, HD 155885, LHS 438, SAO 185199
C: V2215 Ophiuchi, GJ 664, CD−26°12036, HD 156026, GCTP 3913.00, LHS 439, SAO 185213, HIP 84478
Database references
SIMBAD	AB
	A
	B
	C
Exoplanet Archive	A
	B
	C
ARICNS	A
	B
	C

36 Ophiuchi

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