Gliese 667 information

Gliese 667 A/B/C
	Location of Gliese 667 (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Scorpius
Right ascension	17h 18m 57.16483s
Declination	−34° 59′ 23.1416″
Apparent magnitude (V)	5.91/7.20/10.20
Characteristics
Spectral type	K3V + K5V + M1.5V
U−B color index	0.83/???/1.17
B−V color index	1.03/???/1.57
Variable type	A: suspected; B: unknown; C: flare star[citation needed]
Astrometry
Radial velocity (Rv)	6.13±0.30 km/s
Proper motion (μ)	RA: 1131.517 mas/yr ; Dec.: −215.569 mas/yr
Parallax (π)	138.0663 ± 0.0283 mas
Distance	23.623 ± 0.005 ly ; (7.243 ± 0.001 pc)
Absolute magnitude (MV)	7.07/8.02/11.03
Details
GJ 667 AB
Mass	0.73 / 0.69 M☉
Radius	0.76 / 0.70 R☉
Metallicity [Fe/H]	–0.59 dex
GJ 667 C
Mass	0.327±0.008 M☉
Radius	0.337±0.014 R☉
Luminosity	0.01439±0.00035 L☉
Temperature	3,443+75; −71 K
Metallicity [Fe/H]	–0.59 ± 0.10 dex
Rotation	105 days
Age	2–10 Gyr
Orbit
Companion	Gliese 667 B
Period (P)	42.15 yr
Semi-major axis (a)	1.81″
Eccentricity (e)	0.58
Inclination (i)	128°
Longitude of the node (Ω)	313°
Periastron epoch (T)	1975.9
Argument of periastron (ω); (secondary)	247°
Other designations
	142 G. Scorpii, CD−34°11626, GJ 667, HD 156384, HIP 84709, HR 6426, LHS 442/442/443, SAO 208670, 2MASS J17185698-3459236
Database references
	AB
	A
	B
	C
	Cb
	Cc
	Ce
	Cf
Exoplanet Archive	Gliese 667 C
ARICNS	Gliese 667 A
	B
	C

Gliese 667 (142 G. Scorpii) is a triple-star system in the constellation Scorpius lying at a distance of about 7.2 parsecs (23 light-years) from Earth. All three of the stars have masses smaller than the Sun. There is a 12th-magnitude star close to the other three, but it is not gravitationally bound to the system. To the naked eye, the system appears to be a single faint star of magnitude 5.89.

The system has a relatively high proper motion, exceeding 1 second of arc per year.

The two brightest stars in this system, GJ 667 A and GJ 667 B, are orbiting each other at an average angular separation of 1.81 arcseconds with a high eccentricity of 0.58. At the estimated distance of this system, this is equivalent to a physical separation of about 12.6 AU, or nearly 13 times the separation of the Earth from the Sun. Their eccentric orbit brings the pair as close as about 5 AU to each other, or as distant as 20 AU, corresponding to an eccentricity of 0.6.^{[note 1]}^[10] This orbit takes approximately 42.15 years to complete and the orbital plane is inclined at an angle of 128° to the line of sight from the Earth. The third star, GJ 667 C, orbits the GJ 667 AB pair at an angular separation of about 30", which equates to a minimum separation of 230 AU.^[8]^[11] GJ 667 C also has a system of two confirmed super-Earths and a number of additional doubtful candidates, though the innermost, GJ 667 Cb, may be a gas dwarf; GJ 667 Cc, and the controversial Cf and Ce, are in the circumstellar habitable zone.^[12]

^ ^a ^b Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference aaa367_521 was invoked but never defined (see the help page).
^ Suárez Mascareño, A.; et al. (September 2015), "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators", Monthly Notices of the Royal Astronomical Society, 452 (3): 2745–2756, arXiv:1506.08039, Bibcode:2015MNRAS.452.2745S, doi:10.1093/mnras/stv1441, S2CID 119181646.
^ ^a ^b ^c Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
^ Cite error: The named reference mnras389_2_925 was invoked but never defined (see the help page).
^ Cite error: The named reference aaa373_159 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference Pineda2021 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference Anglada-Escudé-2012 was invoked but never defined (see the help page).
^ Cite error: The named reference aaa341_121 was invoked but never defined (see the help page).
^ Cite error: The named reference bowman was invoked but never defined (see the help page).
^ Cite error: The named reference Gregory was invoked but never defined (see the help page).
^ "Habitable Planet Reality Check: GJ 667C". Drew Ex Machina. September 7, 2014.

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

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[aaa367_521-2] Cite error: The named reference aaa367_521 was invoked but never defined (see the help page).

[mnras452_3_2745-3] Suárez Mascareño, A.; et al. (September 2015), "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators", Monthly Notices of the Royal Astronomical Society, 452 (3): 2745–2756, arXiv:1506.08039, Bibcode:2015MNRAS.452.2745S, doi:10.1093/mnras/stv1441, S2CID 119181646.

[GaiaDR3-4] Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).

[mnras389_2_925-5] Cite error: The named reference mnras389_2_925 was invoked but never defined (see the help page).

[aaa373_159-6] Cite error: The named reference aaa373_159 was invoked but never defined (see the help page).

[Pineda2021-7] Cite error: The named reference Pineda2021 was invoked but never defined (see the help page).

[Anglada-Escudé-2012-8] Cite error: The named reference Anglada-Escudé-2012 was invoked but never defined (see the help page).

[aaa341_121-9] Cite error: The named reference aaa341_121 was invoked but never defined (see the help page).

[bowman-11] Cite error: The named reference bowman was invoked but never defined (see the help page).

[Gregory-12] Cite error: The named reference Gregory was invoked but never defined (see the help page).

[13] "Habitable Planet Reality Check: GJ 667C". Drew Ex Machina. September 7, 2014.

Observation data Epoch J2000 Equinox J2000
Location of Gliese 667 (circled)
Constellation	Scorpius
Right ascension	17^h 18^m 57.16483^s^[1]
Declination	−34° 59′ 23.1416″^[1]
Apparent magnitude (V)	5.91/7.20/10.20^[2]
Characteristics
Spectral type	K3V + K5V + M1.5V^[2]^[3]
U−B color index	0.83/???/1.17
B−V color index	1.03/???/1.57
Variable type	A: suspected B: unknown C: flare star^{[citation needed]}
Astrometry

Radial velocity (R_v)	6.13±0.30^[4] km/s
Proper motion (μ)	RA: 1131.517 mas/yr^[4] Dec.: −215.569 mas/yr^[4]
Parallax (π)	138.0663 ± 0.0283 mas^[4]
Distance	23.623 ± 0.005 ly (7.243 ± 0.001 pc)
Absolute magnitude (M_V)	7.07/8.02/11.03

Details
GJ 667 AB
Mass	0.73 / 0.69^[5] `M`_☉
Radius	0.76 / 0.70^[2] `R`_☉
Metallicity [Fe/H]	–0.59^[6] dex
GJ 667 C
Mass	0.327±0.008^[7] `M`_☉
Radius	0.337±0.014^[7] `R`_☉
Luminosity	0.01439±0.00035^[7] `L`_☉
Temperature	3,443+75 −71^[7] K
Metallicity [Fe/H]	–0.59 ± 0.10^[8] dex
Rotation	105 days ^[8]
Age	2–10^[8] Gyr
Orbit^[9]
Companion	Gliese 667 B
Period (P)	42.15 yr
Semi-major axis (a)	1.81″
Eccentricity (e)	0.58
Inclination (i)	128°
Longitude of the node (Ω)	313°
Periastron epoch (T)	1975.9
Argument of periastron (ω) (secondary)	247°
Other designations
142 G. Scorpii, CD−34°11626, GJ 667, HD 156384, HIP 84709, HR 6426, LHS 442/442/443, SAO 208670, 2MASS J17185698-3459236
Database references
	AB
	A
	B
	C
	Cb
	Cc
	Ce
	Cf
Exoplanet Archive	Gliese 667 C
ARICNS	Gliese 667 A
	B
	C

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