Gliese 649
Appearance
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 mas[1] |
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 | 3733±20[2] K |
Metallicity [Fe/H] | −0.04±0.17[2] dex |
Age | 0.48 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
ARICNS | data |
Gliese 649 is a red dwarf star in the constellation of Hercules, located roughly 34 light years from the Sun. The star has been found to host an extrasolar planet.
A planetary companion
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 the 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.
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
- ^ 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
- ^ 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.
- ^ 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