HD 202206
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Capricornus[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | Script error: No such module "val".[3] |
| Characteristics | |
| Spectral type | G6V[4] + M8V[3] |
| B−V Template:Engvar | Script error: No such module "val".[1] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: −39.079[2] mas/yr Dec.: −119.999[2] mas/yr |
| Parallax (π) | 21.7264±0.0651 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +4.80[1] |
| Orbit[3] | |
| Period (P) | 256.33 days |
| Semi-major axis (a) | Script error: No such module "val". |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Longitude of the node (Ω) | Script error: No such module "val".° |
| Periastron epoch (T) | Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Details | |
| A | |
| Mass | Script error: No such module "val".[3] Template:Solar mass |
| Radius | Script error: No such module "val".[2] Template:Solar radius |
| Luminosity | Script error: No such module "val".[2] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[3] cgs |
| Temperature | Script error: No such module "val".[2] K |
| Metallicity [Fe/H] | Script error: No such module "val".[1] dex |
| Rotational velocity (v sin i) | Script error: No such module "val".[3] km/s |
| Age | Script error: No such module "val".[3] Gyr |
| B | |
| Mass | Script error: No such module "val".[3] Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[6] | |
| Database references | |
| SIMBAD | data |
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HD 202206 is a binary star system in the southern constellation of Capricornus. With an apparent visual magnitude of +8.1,[3] it is too faint to be visible to the naked eye. It is located at a distance of 150 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +14.7 km/s.[5]
The primary component is a G-type main-sequence star with a stellar classification of G6V,[4] indicating it is generating energy through core hydrogen fusion. It is an estimated three[3] billion years old and is spinning with a projected rotational velocity of 2.3 km/s.[3] It is a metal-rich star – what astronomers term the abundance of elements of higher atomic number than helium – which may explain the star's unusually high luminosity for its class.[7] The star has a slightly greater mass and radius compared to the Sun.[3]
Companions
In 2000, analysis of radial velocity measurements of the star revealed the existence of a brown dwarf companion[8] with at least 17 times the mass of Jupiter around the star in an eccentric orbit with a period of around 256 days.[7] Even after the brown dwarf was accounted for, the star still showed a drift in the radial velocity measurements, suggesting another companion in a longer-period orbit. In 2004 after further observations, the parameters of a proposed companion was announced.[9]
Further observation of this system revised this picture in 2017, showing that the system instead consisted of a pair of co-orbiting stars being viewed nearly face-on, with the pair being orbited in turn by a Super-Jupiter designated HD 202206 c. The secondary stellar companion, now designated component B rather than 'b', is a red dwarf star with 8.9% of the mass of the Sun.[3]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet
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References
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- ↑ a b c d Template:Cite XHIP
- ↑ a b c d e f g h Template:Cite Gaia DR2
- ↑ a b c d e f g h i j k l m Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ Template:Cite simbad
- ↑ a b Script error: No such module "Citation/CS1".
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- ↑ Script error: No such module "Citation/CS1".
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External links
- HD 202206 Template:Webarchive on Extrasolar Planets Encyclopaedia
- Extrasolar Planet Interactions Template:Webarchive by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona