HD 102117

HD 102117 or Uklun /ˈʌklən/ 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]

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
Distance129 ± 3 ly
(39.7 ± 1.0 pc)
Details
Mass1.37 ± 0.130[3] M☉
Radius1.27[4] R☉
Luminosity1.54[4] L☉
Surface gravity (log g)4.37 ±0.06[4] cgs
Temperature5,695 ± 44[3] K
Metallicity [Fe/H]0.18 ±0.05 dex
Rotational velocity (v sin i)0.88 ± 0.5[4] km/s
Age5.3 ± 3.4[3] Gyr
Other designations
Uklun, CD–58°4207, HIP 57291, SAO 239348
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

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] ookl-salan (likl = little, salan = person

HD 102117, and its planet HD 102117b, were chosen as part of the 2019 NameExoWorlds campaign organised by the International Astronomical Union, which assigned each country a star and planet to be named. HD 102117 was assigned to Pitcairn Islands. The winning proposal named the star Uklun, from the word aklan 'we/us' in the Pitcairn language, and the planet Leklsullun /lɛkəlsʌlən/, from the phrase lekl salan 'child/children' (lit. 'little person').[7]

The HD 102117 planetary system[8]
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 — —
gollark: Yes, that is a feature.
gollark: Solarflame: that's a feature.
gollark: What about making a potatOS competitor?
gollark: There is no maths, only potatOS.
gollark: A sin(60) specifically.

See also

References
  1. 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. "SIMBAD query result: HIP 57291 -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2009-05-23.
  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
  4. "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. CiteSeerX 10.1.1.491.2941. 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. "Pitcairn Islands". NameExoworlds. Retrieved 2019-12-30.
  8. 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.


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