HD 205739
HD 205739 is a yellow-white dwarf (spectral type F7 V). It is about 108 parsecs away from the Sun.[1]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Piscis Austrinus |
| Right ascension | 21h 38m 08.404s[1] |
| Declination | −31° 44′ 14.96″ [1] |
| Apparent magnitude (V) | 8.56 |
| Characteristics | |
| Spectral type | F7 V |
| B−V color index | 0.546 |
| Astrometry | |
| Radial velocity (Rv) | 9.1 km/s |
| Proper motion (μ) | RA: 20.94 ± 0.90[1] mas/yr Dec.: -83.69 ± 0.53[1] mas/yr |
| Parallax (π) | 9.28 ± 0.84[1] mas |
| Distance | 350 ± 30 ly (108 ± 10 pc) |
| Absolute magnitude (MV) | 3.78 |
| Details | |
| Mass | 1.22 M☉ |
| Radius | 1.33 R☉ |
| Luminosity | 2.3 L☉ |
| Temperature | 6176 ± 45 K |
| Metallicity | +0.19 ± 0.04 |
| Age | 2.84 Gyr years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia | data |
The star HD 205739 is named Sāmaya. The name was selected in the NameExoWorlds campaign by Sri Lanka, during the 100th anniversary of the IAU. Sāmaya means peace in the Sinhalese language.[2][3]
A Jupiter-like planet has recently been detected in a Mercury-like eccentric orbit around this star.
There is a trend in the results which may point to an additional companion further from its star.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >1.37 MJ | 0.896 | 279.8 ± 0.1 | 0.27 ± 0.07 | — | — |
See also
References
- 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
- "Approved names". NameExoworlds. Retrieved 2020-01-02.
- "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
- López-Morales, Mercedes; et al. (2008). "Two Jupiter-Mass Planets Orbiting HD 154672 and HD 205739". The Astronomical Journal. 136 (5): 1901–1905. arXiv:0809.1037. Bibcode:2008AJ....136.1901L. doi:10.1088/0004-6256/136/5/1901.
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