Astronomy:HD 102117

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Short description: Star in the constellation Centaurus
HD 102117 / Uklun
Observation data
Equinox J2000.0]] (ICRS)
Constellation Centaurus[1]
Right ascension  11h 44m 50.46086s[2]
Declination −58° 42′ 13.3580″[2]
Apparent magnitude (V) 7.47[1]
Characteristics
Evolutionary stage subgiant[2]
Spectral type G6V[3]
B−V color index 0.721±0.009[1]
Variable type Constant[4]
Astrometry
Radial velocity (Rv)+49.52±0.12[2] km/s
Proper motion (μ) RA: −63.574[2] mas/yr
Dec.: −70.331[2] mas/yr
Parallax (π)25.3531 ± 0.0178[2] mas
Distance128.65 ± 0.09 ly
(39.44 ± 0.03 pc)
Absolute magnitude (MV)4.48[1]
Details
Mass1.37±0.130 M☉[5]
1.03±0.05[6] M☉
Radius1.27[7] R☉
Luminosity1.54[7] L☉
Surface gravity (log g)4.37±0.06[7] cgs
Temperature5,695±44[5] K
Metallicity [Fe/H]0.30±0.03[6] dex
Rotational velocity (v sin i)0.88±0.5[7] km/s
Age5.3±3.4[5] Gyr
Other designations
Uklun, CD−58°4207, HD 102117, HIP 57291, SAO 239348[8]
Database references
SIMBADdata
Exoplanet Archivedata

HD 102117 or Uklun /ˈʌklən/ is a star in the southern constellation of Centaurus. With an apparent visual magnitude of 7.47,[1] it is too dim to be seen without binoculars or a small telescope. It is located at a distance of approximately 129 light-years from the Sun based on parallax. HD 102117 is drifting further away with a radial velocity of +50 km/s,[2] having come to within 43.9 light-years some 692,000 years ago.[1] It has one known planet.[6]

The stellar classification of HD 102117 is G6V,[9] which matches the spectrum of an ordinary G-type main-sequence star. It is roughly five[5] billion years old and is spinning with a projected rotational velocity of 0.9 km/s.[7] The star shows only a low level of chromospheric activity[6] and is photometrically stable,[4] meaning it doesn't vary significantly in brightness. It appears metal-enriched,[4] showing a higher abundance of heavy elements compared to the Sun.

Planetary system

In 2004, the Anglo-Australian Planet Search announced a planet orbiting the star.[4] 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]

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').[10]

The HD 102117 planetary system[11]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b / Leklsullun 0.172 ± 0.020 MJ 0.1532 ± 0.0088 20.8133 ± 0.0064 0.121 ±0.082 — —

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume I. Bibcode: 1975mcts.book.....H. 
  4. ↑ 4.0 4.1 4.2 4.3 Tinney, C. G. et al. (2005). "Three Low-Mass Planets from the Anglo-Australian Planet Search". The Astrophysical Journal 623 (2): 1171–1179. doi:10.1086/428661. Bibcode: 2005ApJ...623.1171T. 
  5. ↑ 5.0 5.1 5.2 5.3 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, doi:10.1086/430500, Bibcode: 2005ApJS..159..141V 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 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. doi:10.1051/0004-6361:20052864. Bibcode: 2005A&A...437.1121L. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 "SPOCS I", Exoplanets (Yale University), http://exoplanets.astro.yale.edu/science/analysis/spocs.php, retrieved 2012-01-31 
  8. ↑ "HD 102117". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+102117. 
  9. ↑ Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode: 1978mcts.book.....H. 
  10. ↑ "Pitcairn Islands" (in en). http://www.nameexoworlds.iau.org/pitcairn-islands. 
  11. ↑ Butler, R. P. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. doi:10.1086/504701. Bibcode: 2006ApJ...646..505B. 

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



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