HD 30177

HD 30177 is an 8th magnitude star located approximately 182 light-years (56 parsecs) away in the constellation Dorado. The star is a yellow dwarf, a type of yellow star that fuses hydrogen in its core. Since if this star is a late G-type, it is cooler and less massive than the Sun, but larger in radius. It is 1.8 times older than our Sun. This star system contains two known extrasolar planets.

HD 30177
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Dorado
Right ascension  04h 41m 54.3740s[1]
Declination −58° 01′ 14.7247″[1]
Apparent magnitude (V) 8.41
Characteristics
Spectral type G8V
Astrometry
Proper motion (μ) RA: 66.205±0.063[1] mas/yr
Dec.: −11.990±0.083[1] mas/yr
Parallax (π)17.9611 ± 0.0407[1] mas
Distance181.6 ± 0.4 ly
(55.7 ± 0.1 pc)
Absolute magnitude (MV)4.72
Details
Mass1.09 ± 0.02[2] M☉
Radius1.54 ± 0.03[2] R☉
Luminosity1.04 ± 0.01[2] L☉
Surface gravity (log g)4.38 ± 0.03[2] cgs
Temperature5607 ± 47[2] K
Age4.8 ± 1.5[2] Gyr
Other designations
CD−58°984, HIP 21850, SAO 233633
Database references
SIMBADdata

Planetary system

The Anglo-Australian Planet Search team announced the discovery of HD 30177 b, which has a minimum mass 8 times that of Jupiter, on June 13, 2002. The scientific paper describing the discovery was published in The Astrophysical Journal in 2003.[3][4] A second massive gas giant planet was later discovered in an approximately 32 year orbit.[5]

The HD 30177 planetary system[5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >8.08±0.10 MJ 3.58±0.01 2524.4±9.8 0.184±0.012 — —
c >7.6±3.1 MJ 9.89±1.04 11613±1837 0.22±0.14 — —

See also

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. Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951.
  3. Tinney, Chris (2007-09-07). "AAPS Discovered Planets". Anglo-Australian Planet Search. University of New South Wales. Retrieved 2018-04-17.
  4. Tinney, C. G.; et al. (2003). "Four New Planets Orbiting Metal-enriched Stars". The Astrophysical Journal. 587 (1): 423–428. arXiv:astro-ph/0207128. Bibcode:2003ApJ...587..423T. doi:10.1086/368068.
  5. Wittenmyer, Robert A.; et al. (2017). "The Anglo-Australian Planet Search. XXV. A Candidate Massive Saturn Analog Orbiting HD 30177". The Astronomical Journal. 153 (4). 167. arXiv:1612.02072. Bibcode:2017AJ....153..167W. doi:10.3847/1538-3881/aa5f17.


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