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 | 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 |
| Extrasolar Planets Encyclopaedia | 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
- 1 2 3 4 5 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 - 1 2 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.
- 1 2 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
Coordinates: 
16h 58m 08.85s, +25° 44′ 38.97″