Gliese 649

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Gliese 649
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hercules
Right ascension 16h 58m 08.850s[1]
Declination 25° 44′ 38.99″[1]
Apparent magnitude (V) 9.62
Characteristics
Spectral type M1.5V
Apparent magnitude (B) 11.21
Apparent magnitude (R) 8.8
Apparent magnitude (I) 8.0
Apparent magnitude (J) 6.448
Apparent magnitude (H) 5.865
Apparent magnitude (K) 5.624
B−V color index 1.496
V−R color index 0.8
R−I color index 0.8
Astrometry
Radial velocity (Rv) 6.4 km/s
Proper motion (μ) RA: −114.07 ± 0.95[1] mas/yr
Dec.: −506.26 ± 1.33[1] mas/yr
Parallax (π) 96.67 ± 1.39[1] mas
Distance 33.7 ± 0.5 ly
(10.3 ± 0.1 pc)
Absolute magnitude (MV) 9.595
Details
Mass 0.54 M
Radius 0.52 R
Luminosity 0.045 L
Temperature 3,733 ± 20[2] K
Metallicity [Fe/H] –0.04 ± 0.17[2] dex
Age 0.48 Gyr
Other designations
HIP 83043, TYC 2063-00479-1, BD+25 3173, 2MASS J16580884+2544392
Database references
SIMBAD data
Exoplanet Archive data
ARICNS data
Extrasolar Planets
Encyclopaedia
data

Gliese 649 is a red dwarf star in the constellation of Hercules, located roughly 34 light years from Sun. The star has been found to host an extrasolar planet.

A planetary companion[edit]

According to Johnson et al. (2010) a Saturn-mass planet has been detected around the red dwarf star.[3] It yields 32.8% of Jupiter's mass and is located 1.15 astronomical units from its star in eccentric orbit (e=0.3). Assuming a luminosity of 4.5% that of Sun, the habitable zone is located at 0.21 AUs, thus the planet should be as cold as if it were located at 5.5 AUs from a Solar-like star. Also accounting different periastron and apastron positions of 0.8 and 1.49 AUs respectively, the planet could likely show seasonal temperature changes.

The Gliese 649 planetary system[3]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b ≥ 0.328 ± 0.032 MJ 1.135 ± 0.035 598.3 ± 4.2 0.30 ± 0.08

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:0708.1752. 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:1112.4567. Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93. 
  3. ^ a b Johnson, John Asher et al. (2010). "The California Planet Survey II. A Saturn-Mass Planet Orbiting the M Dwarf Gl649". The Publications of the Astronomical Society of the Pacific 122 (888): 149–155. arXiv:0912.2730. Bibcode:2010PASP..122..149J. doi:10.1086/651007. 

See also[edit]

Coordinates: Sky map 16h 58m 08.85s, +25° 44′ 38.97″