Gliese 849

Gliese 849
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aquarius
Right ascension 22h 09m 40.34431s[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 (Rv)−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]
Distance28.750 ± 0.008 ly
(8.815 ± 0.002 pc)
Absolute magnitude (MV)10.62[2]
Details[5]
Mass0.465±0.011 M☉
Radius0.464±0.018 R☉
Luminosity0.02887±0.00025 L☉
Surface gravity (log g)4.771±0.032 cgs
Temperature3,467±68[6] K
Metallicity [Fe/H]0.09±0.09[6] dex
Rotation40.45+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
SIMBADdata
Exoplanet Archivedata
ARICNSdata
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]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  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).
  3. ^ a b c d Cite error: The named reference Butler2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Schweitzer_et_al_2019 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Pineda2021 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Pinamonti2023 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. ^ a b Cite error: The named reference Feng2015 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference mnras452_3_2745 was invoked but never defined (see the help page).