Gliese 849
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 09m 40.34438s[1] |
Declination | –04° 38′ 26.6513″[1] |
Apparent magnitude (V) | 10.41[2] |
Characteristics | |
Evolutionary stage | Main sequence[3] |
Spectral type | M3.5V[4] |
U−B color index | 1.055[2] |
B−V color index | 1.531±0.035[2] |
V−R color index | 1.12[2] |
R−I color index | 1.41[2] |
Astrometry | |
Radial velocity (Rv) | −15.26±0.10[2] km/s |
Proper motion (μ) | RA: 1,132.534±0.081[1] mas/yr Dec.: −22.125±0.083[1] mas/yr |
Parallax (π) | 113.4447 ± 0.0300[5] mas |
Distance | 28.750 ± 0.008 ly (8.815 ± 0.002 pc) |
Absolute magnitude (MV) | 10.62[2] |
Details[4] | |
Mass | 0.4870±0.0048 M☉ |
Radius | 0.4833±0.0043 R☉ |
Luminosity | 0.02833±0.00045 L☉ |
Surface gravity (log g) | 4.771±0.032 cgs |
Temperature | 3,601±19[6] K |
Metallicity [Fe/H] | 0.35±0.10[6] dex |
Rotation | 39.2±6.3 d[7] |
Rotational velocity (v sin i) | 2.4[3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
ARICNS | data |
Planet | |
Gliese 849b | data |
Gliese 849, or GJ 849, is a small, solitary star in the equatorial constellation of Aquarius. It has a reddish hue and is invisible to the naked eye with an apparent visual magnitude of 10.41.[2] The distance to this star is 28.7 light years based on parallax,[1] but it is drifting closer to the Sun with a radial velocity of −15.3 km/s.[2] It has a pair of confirmed gas giant companions.[6]
The stellar classification of GJ 849 is M3.5V,[4] which means this is a small red dwarf star generating energy through hydrogen fusion at its core region. Various studies have found super-solar abundances in the spectra,[6] indicating that the elemental abundances of higher mass elements is significantly higher than in the Sun. The star has about half the mass and size of the Sun,[3] and is spinning slowly with a rotation period of approximately 39 days.[7] The estimated age of the star is more than three billion years.[3] It is radiating a mere 2.8%[4] of the luminosity of the Sun from its photosphere at an effective temperature of 3,601 K.[6]
Planetary system[]
In late 2006, a long-period Jupiter-like exoplanet 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.[3] The trend in the radial velocities was confirmed in 2013.[9] An orbit for the second exoplanet was finally determined in 2015. It is the first planet discovered orbiting a red dwarf with a semi-major axis greater than 0.21 AU.[6]
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[]
- List of star systems within 25–30 light-years
- Gliese 317
- Gliese 649
- Gliese 581
- List of extrasolar planets
References[]
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f g h i Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ a b c d e Butler, R. Paul; et al. (2006). "A Long-Period Jupiter-Mass Planet Orbiting the Nearby M Dwarf GJ 849". Publications of the Astronomical Society of the Pacific. 118 (850): 1685–1689. arXiv:astro-ph/0610179. Bibcode:2006PASP..118.1685B. doi:10.1086/510500. S2CID 14787596.
- ^ a b c d Schweitzer, A.; et al. (May 2019). "The CARMENES search for exoplanets around M dwarfs. Different roads to radii and masses of the target stars". Astronomy & Astrophysics. 625: 16. arXiv:1904.03231. Bibcode:2019A&A...625A..68S. doi:10.1051/0004-6361/201834965. S2CID 102351979. A68.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
- ^ a b c d e f g 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 (1). 22. arXiv:1501.00633. Bibcode:2015ApJ...800...22F. doi:10.1088/0004-637X/800/1/22. S2CID 56390823.
- ^ a b 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, S2CID 119181646.
- ^ "BD-05 5715". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-20.
- ^ Bonfils, Xavier; Delfosse, Xavier; Udry, Stéphane; Forveille, Thierry; Mayor, Michel; Perrier, Christian; Bouchy, François; Gillon, Michaël; Lovis, Christophe; Pepe, Francesco; Queloz, Didier; Santos, Nuno C.; Ségransan, Damien; Bertaux, Jean-Loup (2011). "The HARPS search for southern extra-solar planets XXXI. The M-dwarf sample". Astronomy and Astrophysics: A109. arXiv:1111.5019. Bibcode:2013A&A...549A.109B. doi:10.1051/0004-6361/201014704. S2CID 119288366.
External links[]
- "Gj 849". The Extrasolar Planets Encyclopedia.
- "BD-05 5715 / Gl 849". Solstation.
- "Image: Gliese 849". Aladin Previewer.
Coordinates: 22h 09m 40.3460s, −4° 38′ 26.624″
- M-type main-sequence stars
- Planetary systems with two confirmed planets
- Aquarius (constellation)
- Durchmusterung objects
- Gliese and GJ objects
- Hipparcos objects
- 2MASS objects