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Revision as of 10:06, 24 April 2019

Star in the Hercules constellation
Gliese 686
Constellation Hercules
Right ascension α 17h 37min 53,35s
Declination δ +18º 35’ 30,2’’
Distance 26.5 light years
Apparent Magnitude +9.62
Absolute Magnitude +10.17
Luminosity 0.027 solar
Temperature 3484 ± 50 K
Mass 0.47 solar
Radius 0.51 solar
Spectral type M1.0V

Gliese 686 (GJ 686 / HIP 86287 / LHS 452) is a star in the Hercules constellation of apparent magnitude +9.62. Although it is close to the Solar System - at 26.5 light years - it is not the closest known star in its constellation, since Gliese 661 is 20.9 light years away. 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.

Gliese 686 is one of the many red dwarfs in the Solar System neighborhood Of spectral type M1.0V, it has an effective temperature of 3484 ± 50 K. Its brightness in the visible spectrum is equal to 0.82% of that of the Sun, while its total luminosity is equivalent to 2.7% that of the Sun, 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; thus, 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 equal to half the solar radius. Its projected rotation speed is 2.5 km / s, its rotation period being equal to or less than 10.3 days. It has a metallic content lower than that of the Sun; various studies estimate its index metallicity between -0.25 and -0.44. It has an approximate mass between 45% and 49% of the solar mass and is a star with characteristics comparable to that of Lacaille 9352.

Planetary System

Gliese 686 has one known Super Earth planet detected by radial velocity.

The Gliese 686 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 7.1±0.9 M🜨 0.091±0.004 15.53209+0.00166−0.00167 — — —

References

  1. ^ LHS 452 - High proper-motion Star (SIMBAD)
  2. "Closest stars". closeststars.com. Retrieved 2019-03-31.
  3. "Stars within 15 light-years of Bonner Durchmusterung +18°3421 (The Internet Stellar Database)". stellar-database.com. Retrieved 2019-03-31.
  4. "Bonner Durchmusterung +18°3421 (The Internet Stellar Database)". stellar-database.com. Retrieved 2019-03-31.
  5. Morales, J. C.; Ribas, I.; Jordi, C. (2008). "The effect of activity on stellar temperatures and radii". Astronomy and Astrophysics. 478 (2). pp. 507-512.
  6. ^ Houdebine, E. R. (2010). "Observation and modelling of main-sequence star chromospheres - XIV. Rotation of dM1 stars". Monthly Notices of the Royal Astronomical Society. 407 (3). pp. 1657–1673.
  7. Jenkins, J. S.; Ramsey, L. W.; Jones, H. R. A.; Pavlenko, Y.; Gallardo, J.; Barnes, J. R.; Pinfield, D. J. (2009). "Rotational Velocities for M Dwarfs". The Astrophysical Journal. 704 (2). pp. 975-988.
  8. Bonfils, X.; Delfosse, X.; Udry, S.; Santos, N. C.; Forveille, T.; Ségransan, D. (2005). "Metallicity of M dwarfs. I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence". Astronomy and Astrophysics. 442 (2). pp. 635-642.
  9. Affer, L.; Damasso, M.; Micela, G.; Poretti, E.; Scandariato, G.; Maldonado, J.; Lanza, A. F.; Covino, E.; Rubio, A. Garrido (31 January 2019). "HADES RV program with HARPS-N at TNG. IX. A super-Earth around the M dwarf Gl686". Astronomy & Astrophysics. 622: A193. arXiv:1901.05338. doi:10.1051/0004-6361/201834868. ISSN 0004-6361.
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