HD 102117

HD 102117 / Uklun
Observation data
Epoch J2000      Equinox J2000
Constellation Centaurus
Right ascension 11h 44m 50.46084s[1]
Declination –58° 42′ 13.3564″[1]
Apparent magnitude (V) 7.47[2]
Characteristics
Spectral type G6V[3]
B−V color index 0.721±0.009[2]
Variable type Constant[4]
Astrometry
Radial velocity (Rv)+49.64±0.13[1] km/s
Proper motion (μ) RA: –63.555[1] mas/yr
Dec.: –70.439[1] mas/yr
Parallax (π)25.2369 ± 0.0409 mas[1]
Distance129.2 ± 0.2 ly
(39.62 ± 0.06 pc)
Absolute magnitude (MV)4.48[2]
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[3]
Database references
SIMBADdata

HD 102117 or Uklun /ˈʌklən/ is a star in the southern constellation of Centaurus. With an apparent visual magnitude of 7.47,[2] 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,[1] having come to within 43.9 light-years some 692,000 years ago.[2] It has one known planet.[6]

The stellar classification of HD 102117 is G6V,[8] 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.

  1. ^ a b c d e f g Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Tinney2005 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference apj22159_1_141 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Lovis2005 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference spocs was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Houk1979 was invoked but never defined (see the help page).