HD 205739
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Piscis Austrinus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 8.56[2] |
| Characteristics | |
| Spectral type | F7 V[3] |
| B−V Template:Engvar | Script error: No such module "val".[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: +21.833 mas/yr[1] Dec.: −82.314 mas/yr[1] |
| Parallax (π) | 10.7609±0.0203 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 3.42[2] |
| Details[4] | |
| 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". K |
| Metallicity [Fe/H] | 0.21[5] dex |
| Rotational velocity (v sin i) | 4.06[5] km/s |
| Age | Script error: No such module "val". Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[6] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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HD 205739 is a yellow-white hued star in the southern constellation of Piscis Austrinus, positioned near the western constellation boundary with Microscopium. It has the proper name Sāmaya, which was selected in the NameExoWorlds campaign by Sri Lanka, during the 100th anniversary of the IAU. Sāmaya (
- REDIRECT Template:Wikt-lang
Template:Redirect template) means peace in the Sinhalese language.[7][8]
With an apparent visual magnitude of 8.56,[2] this star requires a small telescope to view. It is located at a distance of approximately 303 light-years from the Sun based on stellar parallax, and is drifting further away with a radial velocity of +9.7 km/s.[1] This star has an absolute magnitude of 3.42.[2]
HD 205739 is an ordinary F-type main-sequence star with a stellar classification of F7 V.[3] This indicates that, like the Sun, it is generating energy through core hydrogen fusion. The star is 2.8[4] billion years old with an inactive chromosphere[9] and is spinning with a projected rotational velocity of 4 km/s.[5] It has 1.3 times the mass of the Sun and 1.6 times the Sun's radius.[4] The abundance of iron is 60% greater than in the Sun, suggesting a higher metallicity.[5] The star is radiating 3.5 times the luminosity of the Sun from its photosphere at an effective temperature of 6,276 K.[4]
A Jupiter-like planet has been detected in an eccentric orbit around this star via Doppler spectroscopy. The eccentricity of 0.27 indicates that the orbit carries the body from Script error: No such module "val". out to Script error: No such module "val". between periastron and apastron. The maximum surface temperature of the planet is ~400 K, varying by 100 K over the course of an orbit. There is a data trend in the results which may point to an additional companion further from its star, but this will require a longer observation period to validate.[9]
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See also
References
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