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.

HD 139357

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Draco
Right ascension	15^h 35^m 16.19846^s[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
BD+54°1756, GC 20977, HD 139357, HIP 76311, HR 5811, SAO 29583, PPM 35043, GCRV 9003[7]
Database references
SIMBAD	data
Exoplanet Archive	data
Extrasolar Planets Encyclopaedia	data

It hosts a planet discovered in 2009.

The HD 139357 planetary system[5]

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. 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.
2. 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.
3. 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.
4. 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.
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. arXiv:0903.3593. Bibcode:2009A&A...499..935D. doi:10.1051/0004-6361/200810837. S2CID 15677079.
6. 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.
7. "HD 139357". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-11.