Gliese 849 information

Gliese 849
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Aquarius
Right ascension	22h 09m 40.34431s
Declination	–04° 38′ 26.6508″
Apparent magnitude (V)	10.41
Characteristics
Evolutionary stage	Main sequence
Spectral type	M3.5V
U−B color index	1.055
B−V color index	1.531±0.035
V−R color index	1.12
R−I color index	1.41
Astrometry
Radial velocity (Rv)	−15.26±0.10 km/s
Proper motion (μ)	RA: 1,132.583(39) mas/yr ; Dec.: −22.157(37) mas/yr
Parallax (π)	113.4447 ± 0.0300 mas
Distance	28.750 ± 0.008 ly ; (8.815 ± 0.002 pc)
Absolute magnitude (MV)	10.62
Details
Mass	0.465±0.011 M☉
Radius	0.464±0.018 R☉
Luminosity	0.02887±0.00025 L☉
Surface gravity (log g)	4.771±0.032 cgs
Temperature	3,467±68 K
Metallicity [Fe/H]	0.09±0.09 dex
Rotation	40.45+0.19; −0.18 d
Rotational velocity (v sin i)	2.4 km/s
Other designations
	BD−05°5715, GJ 849, HIP 109388, LFT 1689, LHS 517, LPM 814, LTT 8889, NLTT 53078, GCRV 13921, 2MASS J22094029-0438267
Database references
SIMBAD	data
Exoplanet Archive	data
ARICNS	data
	Planet
Gliese 849b	data Archived 2019-06-05 at the Wayback Machine

Gliese 849, or GJ 849, is a small, solitary star in the equatorial constellation of Aquarius. It has a reddish hue and is invisible to the naked eye with an apparent visual magnitude of 10.41.^[2] The distance to this star is 28.8 light-years (8.8 parsecs) based on parallax,^[1] but it is drifting closer to the Sun with a radial velocity of −15.3 km/s.^[2] It has a pair of confirmed gas giant companions.^[8]

The stellar classification of GJ 849 is M3.5V,^[4] which means this is a small red dwarf star generating energy through hydrogen fusion at its core region. Various studies have found super-solar abundances in the spectra,^[8] indicating that the elemental abundances of higher mass elements is significantly higher than in the Sun. The star has about half the mass and size of the Sun,^[3] and is spinning slowly with a rotation period of approximately 39 days.^[9] The estimated age of the star is more than three billion years.^[3] It is radiating a mere 2.9%^[5] of the luminosity of the Sun from its photosphere at an effective temperature of 3,490 K.^[5]

^ ^a ^b ^c ^d ^e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference Butler2006 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Schweitzer_et_al_2019 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Pineda2021 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Pinamonti2023 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Feng2015 was invoked but never defined (see the help page).
^ Cite error: The named reference mnras452_3_2745 was invoked but never defined (see the help page).

[GaiaDR3-1] Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).

[Anderson_Francis_2012-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).

[Butler2006-3] Cite error: The named reference Butler2006 was invoked but never defined (see the help page).

[Schweitzer_et_al_2019-4] Cite error: The named reference Schweitzer_et_al_2019 was invoked but never defined (see the help page).

[Pineda2021-5] Cite error: The named reference Pineda2021 was invoked but never defined (see the help page).

[Pinamonti2023-6] Cite error: The named reference Pinamonti2023 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).

[Feng2015-8] Cite error: The named reference Feng2015 was invoked but never defined (see the help page).

[mnras452_3_2745-9] Cite error: The named reference mnras452_3_2745 was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Aquarius
Right ascension	22^h 09^m 40.34431^s^[1]
Declination	–04° 38′ 26.6508″^[1]
Apparent magnitude (V)	10.41^[2]
Characteristics
Evolutionary stage	Main sequence^[3]
Spectral type	M3.5V^[4]
U−B color index	1.055^[2]
B−V color index	1.531±0.035^[2]
V−R color index	1.12^[2]
R−I color index	1.41^[2]
Astrometry

Radial velocity (R_v)	−15.26±0.10^[2] km/s
Proper motion (μ)	RA: 1,132.583(39) mas/yr^[1] Dec.: −22.157(37) mas/yr^[1]
Parallax (π)	113.4447 ± 0.0300 mas^[1]
Distance	28.750 ± 0.008 ly (8.815 ± 0.002 pc)
Absolute magnitude (M_V)	10.62^[2]

Details^[5]

Mass	0.465±0.011 `M`_☉
Radius	0.464±0.018 `R`_☉
Luminosity	0.02887±0.00025 `L`_☉
Surface gravity (log g)	4.771±0.032 cgs
Temperature	3,467±68^[6] K
Metallicity [Fe/H]	0.09±0.09^[6] dex
Rotation	40.45+0.19 −0.18 d^[6]
Rotational velocity (v sin i)	2.4^[3] km/s

Other designations
BD−05°5715, GJ 849, HIP 109388, LFT 1689, LHS 517, LPM 814, LTT 8889, NLTT 53078, GCRV 13921, 2MASS J22094029-0438267^[7]
Database references
SIMBAD	data
Exoplanet Archive	data
ARICNS	data
Planet
Gliese 849b	data Archived 2019-06-05 at the Wayback Machine

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