70 Ophiuchi information

70 Ophiuchi
Observation data; Epoch J2000 Equinox
Constellation	Ophiuchus
	70 Ophiuchi
Right ascension	18h 05m 27.285s
Declination	+02° 29′ 00.36″
Apparent magnitude (V)	4.00 - 4.03
	A
Right ascension	18h 05m 27.371s
Declination	+02° 29′ 59.32″
Apparent magnitude (V)	4.13
	B
Right ascension	18h 05m 27.462s
Declination	+02° 29′ 56.22″
Apparent magnitude (V)	6.07
Characteristics
Spectral type	K0V + K4V
Apparent magnitude (B)	4.97/7.26
Apparent magnitude (R)	3.6/5.6
U−B color index	+0.69
B−V color index	+0.84/+1.19
Variable type	BY Dra or RS CVn
Astrometry
70 Oph A
Radial velocity (Rv)	−6.87 km/s
Proper motion (μ)	RA: 206.525±0.246 mas/yr ; Dec.: −1107.492±0.164 mas/yr
Parallax (π)	195.5674 ± 0.1964 mas
Distance	16.68 ± 0.02 ly ; (5.113 ± 0.005 pc)
Absolute magnitude (MV)	+5.49
70 Oph B
Proper motion (μ)	RA: 333.292±0.264 mas/yr ; Dec.: −1068.354±0.215 mas/yr
Parallax (π)	195.2166 ± 0.1012 mas
Distance	16.707 ± 0.009 ly ; (5.123 ± 0.003 pc)
Orbit
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
Mass	0.90 ± 0.04 M☉
Radius	0.91 ± 0.03 R☉
Luminosity (bolometric)	0.59 ± 0.02 L☉
Surface gravity (log g)	4.5 cgs
Temperature	5,300 K
Metallicity [Fe/H]	+0.04 dex
Rotation	19.7 days
Age	1.9 Gyr
70 Oph B
Mass	0.70 ± 0.07 M☉
Luminosity (bolometric)	0.13 ± 0.03 L☉
Temperature	4,350 ± 150 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
SIMBAD	The system
	A
	B
Exoplanet Archive	data
ARICNS	data
	70 Location of 70 Ophiuchi in the constellation Ophiuchus;

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.

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^ ^a ^b Cite error: The named reference vsx was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference tycho was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference dr2 was invoked but never defined (see the help page).
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^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference pourbaix was invoked but never defined (see the help page).
^ ^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 Holmberg2009 was invoked but never defined (see the help page).
^ ^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.
^ 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.
^ ^a ^b ^c ^d Cite error: The named reference aaa338 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference mnras405_3_1907 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference aaa259 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference aaa521_A12 was invoked but never defined (see the help page).
^ Cite error: The named reference MH08 was invoked but never defined (see the help page).

[aaa474_2_653-1] Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).

[vsx-2] Cite error: The named reference vsx was invoked but never defined (see the help page).

[tycho-3] ^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference tycho was invoked but never defined (see the help page).

[dr2-4] Cite error: The named reference dr2 was invoked but never defined (see the help page).

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

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

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

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

[GaiaEDR3a-9] 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.

[Holmberg2009-10] Cite error: The named reference Holmberg2009 was invoked but never defined (see the help page).

[GaiaEDR3b-11] 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.

[GaiaDR2b-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.

[aaa338-13] Cite error: The named reference aaa338 was invoked but never defined (see the help page).

[mnras405_3_1907-14] Cite error: The named reference mnras405_3_1907 was invoked but never defined (see the help page).

[aaa259-15] Cite error: The named reference aaa259 was invoked but never defined (see the help page).

[aaa521_A12-16] Cite error: The named reference aaa521_A12 was invoked but never defined (see the help page).

[MH08-17] Cite error: The named reference MH08 was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox
Constellation	Ophiuchus
70 Ophiuchi
Right ascension	18^h 05^m 27.285^s^[1]
Declination	+02° 29′ 00.36″^[1]
Apparent magnitude (V)	4.00 - 4.03^[2]
A
Right ascension	18^h 05^m 27.371^s^[3]
Declination	+02° 29′ 59.32″^[3]
Apparent magnitude (V)	4.13^[3]
B
Right ascension	18^h 05^m 27.462^s^[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 (R_v)	−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]
Distance	16.68 ± 0.02 ly (5.113 ± 0.005 pc)
Absolute magnitude (M_V)	+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]
Distance	16.707 ± 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
Mass	0.90 ± 0.04^[13] `M`_☉
Radius	0.91 ± 0.03^[14] `R`_☉
Luminosity (bolometric)	0.59 ± 0.02^[14] `L`_☉
Surface gravity (log g)	4.5^[15] cgs
Temperature	5,300^[15] K
Metallicity [Fe/H]	+0.04^[16] dex
Rotation	19.7 days^[16]
Age	1.9^[17] Gyr
70 Oph B
Mass	0.70 ± 0.07^[13] `M`_☉
Luminosity (bolometric)	0.13 ± 0.03^[13] `L`_☉
Temperature	4,350 ± 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
SIMBAD	The system
	A
	B
Exoplanet Archive	data
ARICNS	data
70 Location of 70 Ophiuchi in the constellation Ophiuchus

70 Ophiuchi information

and 25 Related for: 70 Ophiuchi information

70 Ophiuchi

Exoplanet

Thomas Jefferson Jackson See

36 Ophiuchi

List of stars in Ophiuchus

Methods of detecting exoplanets

Hyperion Cantos

Lists of stars

Lacaille 9352

William Stephen Jacob

Gliese 445

List of nearest stars

Altair

List of nearest bright stars

Procyon

Wolf 1061

Lalande 21185

GJ 1061

Tau Ceti

Dirk Reuyl

40 Eridani

Epsilon Eridani

Van Maanen 2

Main sequence

Gliese 229