Gliese 849

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Gliese 849
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aquarius
Right ascension 22h 9m 40.343s[1]
Declination –4° 38′ 26.62″[1]
Apparent magnitude (V) 10.42
Characteristics
Spectral type M3.5V
U−B color index 1.13
B−V color index 1.51
V−R color index 1.11
R−I color index 1.41
Astrometry
Radial velocity (Rv) −12 ± 5 km/s
Proper motion (μ) RA: 1130.27±2.56[1] mas/yr
Dec.: −19.27±1.33[1] mas/yr
Parallax (π) 109.94 ± 2.07[1] mas
Distance 29.7 ± 0.6 ly
(9.1 ± 0.2 pc)
Absolute magnitude (MV) 10.70
Details
Mass 0.36 M
Radius 0.52 ± 0.07 R
Luminosity 0.029 L
Surface gravity (log g) 4.66 cgs
Temperature 3,601 ± 19[2] K
Metallicity +0.31 ± 0.17[2]
Rotation 39.2±6.3 d[3]
Other designations
BD-05 5715, GCRV 13921, HIP 109388, LFT 1689, LHS 517, LPM 814, LTT 8889, NLTT 53078
Database references
SIMBAD data
Exoplanet Archive data
ARICNS data
Planet
Gliese 849b data

Gliese 849 is a M3.5V red dwarf star approximately 29 light years away in the constellation of Aquarius. It has the first planet discovered orbiting a red dwarf with a semi-major axis greater than 0.21 AU.[4]

Planetary system[edit]

In late 2006, a long-period Jupiter-like planet was reported to be orbiting the red dwarf in a period just over 5 years in length. There was also a linear trend in the radial velocities which suggested another longer period companion.[5] The trend in the radial velocities was confirmed in 2013.[6] An orbit for the second planet was finally determined in 2015.[4]

The Gliese 849 planetary system[4]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b >0.911±0.036 MJ 2.39±0.082 1924±15 0.038±0.019
c >0.944±0.070 MJ 4.82±0.21 5520±390 0.087±0.056

See also[edit]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b Rojas-Ayala, Bárbara; et al. (April 2012). "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs". The Astrophysical Journal. 748 (2): 93. arXiv:1112.4567Freely accessible. Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93.  See table 3.
  3. ^ Suárez Mascareño, A.; et al. (September 2015), "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators", Monthly Notices of the Royal Astronomical Society, 452 (3): 2745–2756, arXiv:1506.08039Freely accessible, Bibcode:2015MNRAS.452.2745S, doi:10.1093/mnras/stv1441. 
  4. ^ a b c Feng, Y. Katherina; et al. (2015). "The California Planet Survey IV: A Planet Orbiting the Giant Star HD 145934 and Updates to Seven Systems with Long-period Planets". The Astrophysical Journal. 800. 22. arXiv:1501.00633Freely accessible. Bibcode:2015ApJ...800...22F. doi:10.1088/0004-637X/800/1/22. 
  5. ^ Butler, R. Paul; et al. (2006). "A Long-Period Jupiter-Mass Planet Orbiting the Nearby M Dwarf GJ 849". The Astronomical Society of the Pacific. 118: 1685–1689. arXiv:astro-ph/0610179Freely accessible. Bibcode:2006PASP..118.1685B. doi:10.1086/510500. 
  6. ^ Bonfils, X.; et al. (2013). "The HARPS search for southern extra-solar planets. XXXI. The M-dwarf sample". Astronomy and Astrophysics. 549. A109. arXiv:1111.5019Freely accessible. Bibcode:2013A&A...549A.109B. doi:10.1051/0004-6361/201014704. 

External links[edit]

Coordinates: Sky map 22h 09m 40.3460s, −4° 38′ 26.624″