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: 130.27±2.56 1[1] mas/yr Dec.: ±1.33 −19.27[1] mas/yr |
Parallax (π) | 113.25 ± 0.32[1] mas |
Distance | 28.80 ± 0.08 ly (8.83 ± 0.02 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 | ±6.3 d 39.2[3] |
Other designations | |
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
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]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | ±0.036 >0.911 MJ | ±0.082 2.39 | ±15 1924 | ±0.019 0.038 | — | — |
c | ±0.070 >0.944 MJ | ±0.21 4.82 | ±390 5520 | ±0.056 0.087 | — | — |
See also
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. See table 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:1506.08039, Bibcode:2015MNRAS.452.2745S, doi:10.1093/mnras/stv1441.
- 1 2 3 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:1501.00633. Bibcode:2015ApJ...800...22F. doi:10.1088/0004-637X/800/1/22.
- ↑ 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/0610179. Bibcode:2006PASP..118.1685B. doi:10.1086/510500.
- ↑ Bonfils, X.; et al. (2013). "The HARPS search for southern extra-solar planets. XXXI. The M-dwarf sample". Astronomy and Astrophysics. 549. A109. arXiv:1111.5019. Bibcode:2013A&A...549A.109B. doi:10.1051/0004-6361/201014704.
External links
- "Gj 849". The Extrasolar Planets Encyclopedia.
- "BD-05 5715 / Gl 849". Solstation.
- "Image: Gliese 849". Aladin Previewer.
Coordinates:
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