HD 102117

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HD 102117
Observation data
Epoch J2000      Equinox J2000
Constellation Centaurus
Right ascension 11h 44m 50.461s[1]
Declination –58° 42′ 13.36″[1]
Apparent magnitude (V) 7.47[2]
Characteristics
Spectral type G6V[2]
Astrometry
Radial velocity (Rv) 48.9 ± 0.2 km/s
Proper motion (μ) RA: –63.74 ± 0.55[1] mas/yr
Dec.: –70.76 ± 0.48[1] mas/yr
Parallax (π) 25.19 ± 0.61[1] mas
Distance 129 ± 3 ly
(39.7 ± 1.0 pc)
Details
Mass 1.37 ± 0.130[3] M
Radius 1.27[4] R
Luminosity 1.54[4] L
Surface gravity (log g) 4.37 ±0.06[4] cgs
Temperature 5,695 ± 44[3] K
Metallicity [Fe/H] 0.18 ±0.05 dex
Rotational velocity (v sin i) 0.88 ± 0.5[4] km/s
Age 5.3 ± 3.4[3] Gyr
Other designations
CD–58°4207, HIP 57291, SAO 239348
Database references
SIMBAD data
Extrasolar Planets
Encyclopaedia
data

HD 102117 is a magnitude 7 yellow dwarf star (spectral type G6V) about 130 light years from Earth in the constellation of Centaurus. Although it is cooler than our Sun it is brighter and thus more evolved. This star is too dim to be seen without binoculars or a small telescope.[2]

Planetary system[edit]

In 2004, the Anglo-Australian Planet Search announced a planet orbiting the star.[5] A short time later the HARPS team also announced the presence of a planet around this star. Both groups detected this planet with the radial velocity method.[6]

The HD 102117 planetary system[7]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 0.172 ± 0.020 MJ 0.1532 ± 0.0088 20.8133 ± 0.0064 0.121 ±0.082

See also[edit]

References[edit]

  1. ^ a b c d e 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
  2. ^ a b c "SIMBAD query result: HIP 57291 -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2009-05-23. 
  3. ^ a b c Valenti, Jeff A.; Fischer, Debra A. (July 2005), "Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs", The Astrophysical Journal Supplement Series 159 (1): 141–166, Bibcode:2005ApJS..159..141V, doi:10.1086/430500 
  4. ^ a b c d "SPOCS I", Exoplanets (Yale University), retrieved 2012-01-31 
  5. ^ Tinney, C. G. et al. (2005). "Three Low-Mass Planets from the Anglo-Australian Planet Search". The Astrophysical Journal 623 (2): 1171–1179. Bibcode:2005ApJ...623.1171T. doi:10.1086/428661. 
  6. ^ Lovis, C. et al. (2005). "The HARPS search for southern extra-solar planets III. Three Saturn-mass planets around HD 93083, HD 101930 and HD 102117". Astronomy and Astrophysics 437 (3): 1121–1126. arXiv:astro-ph/0503660. Bibcode:2005A&A...437.1121L. doi:10.1051/0004-6361:20052864. 
  7. ^ Butler, R. P. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. 

External links[edit]

Coordinates: Sky map 11h 44m 50.4616s, −58° 42′ 13.354″