Gliese 849
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Aquarius[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 10.41[1] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | M3.5V[4] |
| U−B Template:Engvar | 1.055[1] |
| B−V Template:Engvar | Script error: No such module "val".[1] |
| V−R Template:Engvar | 1.12[1] |
| R−I Template:Engvar | 1.41[1] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[2] Dec.: Script error: No such module "val". mas/yr[2] |
| Parallax (π) | 113.4447±0.0300 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 10.62[1] |
| Details[5] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val".[6] K |
| Metallicity [Fe/H] | Script error: No such module "val".[6] dex |
| Rotation | Script error: No such module "val".[6] |
| Rotational velocity (v sin i) | 2.4[3] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | The star |
| planet b | |
| planet c | |
| Exoplanet Archive | data |
| ARICNS | data |
Script error: No such module "Check for unknown parameters".
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.[1] The distance to this star is Script error: No such module "convert". based on parallax,[2] but it is drifting closer to the Sun with a radial velocity of −15.3 km/s.[1] It has a pair of confirmed gas giant companions.[8]
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,[8] 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.[9] The estimated age of the star is more than three billion years.[3] It is radiating a mere 2.9%[5] of the luminosity of the Sun from its photosphere at an effective temperature of 3,490 K.[5]
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.[10] An orbit for the second exoplanet was finally determined in 2015. The first planet discovered, Gliese 849 b, was the first planet discovered orbiting a red dwarf with a semi-major axis greater than 0.21 AU.[8]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:OrbitboxPlanet
|}Script error: No such module "Check for unknown parameters".
See also
- List of star systems within 25–30 light-years
- Gliese 317
- Gliese 649
- Gliese 581
- List of extrasolar planets
References
<templatestyles src="Reflist/styles.css" />
- ↑ a b c d e f g h i j Template:Cite XHIP
- ↑ a b c d e Template:Cite Gaia DR3
- ↑ a b c d e Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b c Script error: No such module "Citation/CS1".
- ↑ a b c Script error: No such module "Citation/CS1".
- ↑ Template:Cite simbad
- ↑ a b c Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
Script error: No such module "Check for unknown parameters".
External links
- Script error: No such module "citation/CS1".
- Script error: No such module "citation/CS1".
- Script error: No such module "citation/CS1".