HD 205739
| 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 |
| Data sources: | |
| Hipparcos Catalogue, HD | |
HD 205739 is a yellow-white dwarf (spectral type F7 V). It is about 108 parsecs away from the Sun.[1]
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.[2]
| 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
- 1 2 3 4 5 6 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
- 1 2 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.
Coordinates: 
21h 38m 08.4055s, −31° 44′ 14.945″
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