Gliese 806 information

Gliese 806
Observation data; Epoch J2000 Equinox J2000
Constellation	Cygnus
Right ascension	20h 45m 04.09925s
Declination	+44° 29′ 56.6451″
Apparent magnitude (V)	+10.79
Characteristics
Spectral type	dM1.5
B−V color index	1.491±0.005
Astrometry
Radial velocity (Rv)	−24.99±0.15 km/s
Proper motion (μ)	RA: 434.028 mas/yr ; Dec.: 271.022 mas/yr
Parallax (π)	82.8903 ± 0.0167 mas
Distance	39.348 ± 0.008 ly ; (12.064 ± 0.002 pc)
Details
Mass	0.423±0.010 M☉
Radius	0.4144±0.0038 R☉
Luminosity	0.0026±0.0003 L☉
Surface gravity (log g)	4.89±0.07 cgs
Temperature	3,586±51 K
Metallicity [Fe/H]	−0.28±0.07 dex
Rotation	34.6–48.1 d
Rotational velocity (v sin i)	0.46 km/s
Age	~3 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
Database references
SIMBAD	data

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]

^ ^a ^b ^c ^d ^e ^f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
^ ^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).
^ ^a ^b ^c ^d Cite error: The named reference Palle2023 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Houdebine2010 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Mann_et_al_2015 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ Cite error: The named reference ExoFOP was invoked but never defined (see the help page).
^ Cite error: The named reference Sinnott_Perryman_1997 was invoked but never defined (see the help page).
^ Cite error: The named reference Bailer-Jones2018 was invoked but never defined (see the help page).

[GaiaDR3-1] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).

[Anderson_Francis_2012-2] Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).

[Schweitzer_et_al_2019-3] ^ ^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).

[Palle2023-4] Cite error: The named reference Palle2023 was invoked but never defined (see the help page).

[Houdebine2010-5] Cite error: The named reference Houdebine2010 was invoked but never defined (see the help page).

[Mann_et_al_2015-6] Cite error: The named reference Mann_et_al_2015 was invoked but never defined (see the help page).

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

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

[Sinnott_Perryman_1997-9] Cite error: The named reference Sinnott_Perryman_1997 was invoked but never defined (see the help page).

[Bailer-Jones2018-10] Cite error: The named reference Bailer-Jones2018 was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox J2000
Constellation	Cygnus
Right ascension	20^h 45^m 04.09925^s^[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 (R_v)	−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]
Distance	39.348 ± 0.008 ly (12.064 ± 0.002 pc)

Details

Mass	0.423±0.010^[3] `M`_☉
Radius	0.4144±0.0038^[4] `R`_☉
Luminosity	0.0026±0.0003^[3] `L`_☉
Surface gravity (log g)	4.89±0.07^[3] cgs
Temperature	3,586±51^[3] K
Metallicity [Fe/H]	−0.28±0.07^[4] dex
Rotation	34.6–48.1 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
SIMBAD	data

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