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 | |
| 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
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]
| 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
References
- 1 2 3 4 5 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
- 1 2 3 "SIMBAD query result: HIP 57291 -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2009-05-23.
- 1 2 3 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
- 1 2 3 4 "SPOCS I", Exoplanets (Yale University), retrieved 2012-01-31
- ↑ 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.
- ↑ 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.
- ↑ 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
- "HD 102117". Exoplanets. Retrieved 2009-05-23.
Coordinates: 
11h 44m 50.4616s, −58° 42′ 13.354″
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