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Gliese 806

Gliese 806
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 20h 45m 04.09925s[1]
Declination +44° 29′ 56.6451″[1]
Apparent magnitude (V) +10.79[2]
Characteristics
Spectral type dM1.5[3]
B−V color index 1.491±0.005[2]
Astrometry
Radial velocity (Rv)−24.99±0.15[1] km/s
Proper motion (μ) RA: 434.028 mas/yr[1]
Dec.: 271.022 mas/yr[1]
Parallax (π)82.8903 ± 0.0167 mas[1]
Distance39.348 ± 0.008 ly
(12.064 ± 0.002 pc)
Details
Mass0.423±0.010[3] M☉
Radius0.4144±0.0038[4] R☉
Luminosity0.0026±0.0003[3] L☉
Surface gravity (log g)4.89±0.07[3] cgs
Temperature3,586±51[3] K
Metallicity [Fe/H]−0.28±0.07[4] dex
Rotation34.6–48.1 d[4]
Rotational velocity (v sin i)0.46[5] km/s
Age~3[6] Gyr
Other designations
NSV 13280, BD+44 3567, GJ 806, HIP 102401, LTT 16068, TOI-4481, TIC 239332587, TYC 3178-00633-1, 2MASS J20450403+4429562[7][8]
Database references
SIMBADdata

Gliese 806 is a star in the northern constellation of Cygnus, located about a degree to the southeast of the bright star Deneb.[9] It is invisible to the naked eye with an apparent visual magnitude of +10.79.[2] The star is located at a distance of 39.3 light years from the Sun based on stellar parallax.[1] It is drifting closer with a radial velocity of −24.6 km/s, and is predicted to come to within 30.1 light-years in ~198,600 years.[10] The star hosts two known planetary companions.[4]

The stellar classification of Gliese 806 is dM1.5,[3] which indicates this is a small red dwarf star – an M-type main-sequence star that is generating energy through core hydrogen fusion. It is roughly three[6] billion years old and is spinning with a projected rotational velocity of 0.46 km/s.[5] The star has 42% of the mass and radius of the Sun. It is radiating 0.3% of the luminosity of the Sun from its photosphere at an effective temperature of 3,586 K.[3]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference Schweitzer_et_al_2019 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Palle2023 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Houdebine2010 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Mann_et_al_2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference ExoFOP was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Sinnott_Perryman_1997 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Bailer-Jones2018 was invoked but never defined (see the help page).
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