Gliese 667

Gliese 667 A/B/C
Location of Gliese 667 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 17h 18m 57.16483s[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 (Rv)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]
Distance23.623 ± 0.005 ly
(7.243 ± 0.001 pc)
Absolute magnitude (MV)7.07/8.02/11.03
Details
GJ 667 AB
Mass0.73 / 0.69[5] M☉
Radius0.76 / 0.70[2] R☉
Metallicity [Fe/H]–0.59[6] dex
GJ 667 C
Mass0.327±0.008[7] M☉
Radius0.337±0.014[7] R☉
Luminosity0.01439±0.00035[7] L☉
Temperature3,443+75
−71[7] K
Metallicity [Fe/H]–0.59 ± 0.10[8] dex
Rotation103.9±0.7 days[9]
Age6.10±2.2[10] Gyr
Orbit[11]
CompanionGliese 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 ArchiveGliese 667 C
ARICNSGliese 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][12] 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][13] 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.[14]

  1. ^ a b Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference aaa367_521 was invoked but never defined (see the help page).
  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.
  4. ^ a b c Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference mnras389_2_925 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference aaa373_159 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Pineda2021 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Anglada-Escudé-2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference 2015MNRAS.452.2745S was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference 2023RNAAS...7..135S was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference aaa341_121 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference bowman was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gregory was invoked but never defined (see the help page).
  14. ^ "Habitable Planet Reality Check: GJ 667C". Drew Ex Machina. September 7, 2014. Archived from the original on May 21, 2020. Retrieved July 18, 2019.


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