Gliese 686

Gliese 686
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules[1]
Right ascension 17h 37m 53.347s[2]
Declination +18° 35′ 30.16″[2]
Apparent magnitude (V) 9.577[3]
Characteristics
Spectral type M1.0V[4]
B−V color index 1.530±0.015[1]
Astrometry
Radial velocity (Rv)−9.55±0.1[5] km/s
Proper motion (μ) RA: 926.638 mas/yr[2]
Dec.: 984.455 mas/yr[2]
Parallax (π)122.5546 ± 0.0176 mas[2]
Distance26.613 ± 0.004 ly
(8.160 ± 0.001 pc)
Absolute magnitude (MV)10.08[1]
Details[4]
Mass0.426±0.017 M☉
Radius0.427±0.013 R☉
Luminosity0.0295±0.0007 L☉
Surface gravity (log g)4.87±0.07 cgs
Temperature3,656±51 K
Metallicity [Fe/H]−0.23±0.16 dex
Rotation38.732±0.286 d
Rotational velocity (v sin i)2.49 km/s
Other designations
BD+18 3421, HIP 86287, G 170-55, LHS 452, 2MASS J17375330+1835295[6]
Database references
SIMBADdata
ARICNSdata

Gliese 686 (GJ 686 / HIP 86287 / LHS 452)[6] is a star in the constellation of Hercules, with an apparent magnitude +9.577.[3] Although it is close to the Solar System – at 26.6 light-years – it is not the closest known star in its constellation, since Gliese 661 is 20.9 light years away.[7] The closest system to this star is the bright μ Herculis, at 4.5 light years. They are followed by GJ 1230 and Gliese 673, at 7.2 and 7.6 light years respectively.[8]

Gliese 686 is one of the many red dwarfs in the Solar System neighborhood with a spectral type of M1V,[3][6] and has an effective temperature of about 3600 K.[3] Its brightness in the visible spectrum is equal to 0.82% of that of the Sun,[9] while its total luminosity is equivalent to 2.7% that of the Sun,[10] since a significant amount of the radiation emitted by these stars is infrared invisible light. Considering only this last parameter, Gliese 686 is considerably brighter than other known red dwarfs: it is 6.5 times more luminous than Ross 154 and 15 times more than Proxima Centauri, the closest star to the Solar System.

Gliese 686 has a radius approximately half that of the Sun. Its projected rotation speed is 2.5 km / s, its rotation period being equal to or less than 10.3 days.[11] It has a metallic content lower than that of the Sun; various studies estimate its index metallicity between -0.25 and -0.44.[11][12] It has an approximate mass between 45% and 49% of the solar mass[13] and is a star with characteristics comparable to that of Lacaille 9352.

  1. ^ a b c Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Affer was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Burt2020 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Nidever was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference SIMBAD1 was invoked but never defined (see the help page).
  7. ^ "Closest stars". closeststars.com. Archived from the original on 2023-04-11. Retrieved 2019-03-31.
  8. ^ "Stars within 15 light-years of Bonner Durchmusterung +18°3421 (The Internet Stellar Database)". stellar-database.com. Retrieved 2019-03-31.
  9. ^ "Bonner Durchmusterung +18°3421 (The Internet Stellar Database)". stellar-database.com. Archived from the original on 2023-04-11. Retrieved 2019-03-31.
  10. ^ Cite error: The named reference Morales was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Houdebine was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Jenkins was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Bonfils was invoked but never defined (see the help page).