HD 139357
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.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Draco |
| Right ascension | 15h 35m 16.19846s[1] |
| Declination | +53° 55′ 19.7147″[1] |
| Apparent magnitude (V) | 5.97[2] |
| Characteristics | |
| Spectral type | K4III[3] |
| B−V color index | 1.184±0.006[2] |
| Astrometry | |
| Radial velocity (Rv) | 8.04±0.14[1] km/s |
| Proper motion (μ) | RA: −18.767[1] mas/yr Dec.: 1.760[1] mas/yr |
| Parallax (π) | 8.8930 ± 0.0551[1] mas |
| Distance | 367 ± 2 ly (112.4 ± 0.7 pc) |
| Absolute magnitude (MV) | 0.61[2] |
| Details | |
| Mass | 1.1±0.1 M☉[4] 1.35±0.24 M☉[5] 2.16±0.18[3] M☉ |
| Radius | 11.47±0.75 R☉[5] 14.4±0.4[3] R☉ |
| Luminosity | 74±1[4] L☉ |
| Surface gravity (log g) | 2.2±0.1 cgs[4] 2.63±0.10 cgs[6] 2.9±0.15[5] cgs |
| Temperature | 4,601±28[6] K |
| Metallicity [Fe/H] | −0.13±0.05 dex[5] 0.34±0.05[3] dex |
| Age | 1.19±0.33 Gyr[6] 3.07±1.47 Gyr[3] 7.20±1.80[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
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
- 42 Draconis
- Iota Draconis
- List of extrasolar planets
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- Maldonado, J.; et al. (April 2019). "Connecting substellar and stellar formation: the role of the host star's metallicity". Astronomy & Astrophysics. 624: 7. arXiv:1903.01141. Bibcode:2019A&A...624A..94M. doi:10.1051/0004-6361/201833827. A94.
- Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics. 585: 14. arXiv:1511.01744. Bibcode:2016A&A...585A...5B. doi:10.1051/0004-6361/201527297. S2CID 53971692. A5.
- 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. S2CID 15677079.
- Maldonado, J.; Villaver, E. (April 2016). "Evolved stars and the origin of abundance trends in planet hosts". Astronomy & Astrophysics. 588: 11. arXiv:1602.00835. Bibcode:2016A&A...588A..98M. doi:10.1051/0004-6361/201527883. A98.
- "HD 139357". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-11.
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