Astronomy:HD 139357
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Short description: Star in the constellation Draco
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Draco |
| Right ascension | 15h 35m 16.198593s[1] |
| Declination | +53° 55′ 19.709392″[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) | −8.53±0.13[1] km/s |
| Proper motion (μ) | RA: −18.845±0.051[1] mas/yr Dec.: 2.097±0.063[1] mas/yr |
| Parallax (π) | 8.8114 ± 0.0460[1] mas |
| Distance | 370 ± 2 ly (113.5 ± 0.6 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 |
HD 139357 is a 6th magnitude K-type giant star located approximately 370 light years from Earth, visible in the constellation Draco. Its mass is four thirds that of the 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 the Sun.
It hosts a substellar companion with a minimum mass of 9.76 |♃|J}}}}}}, discovered in 2009.[5] A 2022 study estimated the true mass of HD 139357 b at about 16.38 MJ via astrometry, although this estimate is poorly constrained. If this is the true mass, the object would be a brown dwarf.[8]
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 3.3 3.4 Maldonado, J. et al. (April 2019). "Connecting substellar and stellar formation: the role of the host star's metallicity". Astronomy & Astrophysics 624: 7. doi:10.1051/0004-6361/201833827. A94. Bibcode: 2019A&A...624A..94M.
- ↑ 4.0 4.1 4.2 4.3 Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics 585: 14. doi:10.1051/0004-6361/201527297. A5. Bibcode: 2016A&A...585A...5B.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 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. doi:10.1051/0004-6361/200810837. Bibcode: 2009A&A...499..935D. http://www.aanda.org/articles/aa/full_html/2009/21/aa10837-08/aa10837-08.html.
- ↑ 6.0 6.1 6.2 Maldonado, J.; Villaver, E. (April 2016). "Evolved stars and the origin of abundance trends in planet hosts". Astronomy & Astrophysics 588: 11. doi:10.1051/0004-6361/201527883. A98. Bibcode: 2016A&A...588A..98M.
- ↑ "HD 139357". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+139357.
- ↑ Feng, Fabo et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series 262 (21): 21. doi:10.3847/1538-4365/ac7e57. Bibcode: 2022ApJS..262...21F.
Coordinates: 
15h 35m 16.1992s, +53° 55′ 19.717″
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