HD 139357
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Draco |
| Right ascension | 15h 35m 16.20s[1] |
| Declination | +53° 55′ 19.7″[1] |
| Apparent magnitude (V) | 5.977 |
| Characteristics | |
| Spectral type | K4III |
| B−V color index | 1.191 |
| Astrometry | |
| Radial velocity (Rv) | –8.75 ± 0.39 km/s |
| Proper motion (μ) | RA: -18.32 ± 0.30[1] mas/yr Dec.: 1.64 ± 0.33[1] mas/yr |
| Parallax (π) | 8.47 ± 0.30[1] mas |
| Distance | 390 ± 10 ly (118 ± 4 pc) |
| Absolute magnitude (MV) | 0.557 |
| Details | |
| Mass | 1.35 ± 0.24 M☉ |
| Radius | 11.47 ± 0.75 R☉ |
| Luminosity | 57.4 L☉ |
| Surface gravity (log g) | 1.51 cgs |
| Temperature | 4700 ± 70 K |
| Metallicity | –0.13 ± 0.05 |
| Age | 3.07 ± 1.47 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 139357 is a 6th magnitude K-type giant star located approximately 390 light years from Earth, visible in the constellation Draco. Its mass is four thirds that of our Sun but its radius is 11.47 times larger. However, despite being a giant star, it is only 3.07 billion years old, which is younger than our Sun.
It hosts a planet discovered in 2009.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥9.76 ± 2.15 MJ | 2.36 ± 0.02 | 1125.7 ± 9 | 0.10 ± 0.02 | — | — |
See also
References
- 1 2 3 4 5 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 - ↑ Döllinger, M. P.; et al. (2009). "Planetary companion candidates around the K giant stars 42 Draconis and HD 139 357". Astronomy and Astrophysics. 499 (3): 935–942. arXiv:0903.3593. Bibcode:2009A&A...499..935D. doi:10.1051/0004-6361/200810837.
Coordinates: 
15h 35m 16.1992s, +53° 55′ 19.717″
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