HD 101917

HD 101917
Location of HD 101917 on the map (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Chamaeleon
Right ascension 11h 42m 54.93206s[1]
Declination −79° 18′ 23.0075″[1]
Apparent magnitude (V) 6.38±0.01[2]
Characteristics
Spectral type K0 III/IV[3]
U−B color index +0.59[4]
B−V color index +0.90[4]
Astrometry
Radial velocity (Rv)32.5±0.4[5] km/s
Proper motion (μ) RA: +127.152 mas/yr[1]
Dec.: −11.599 mas/yr[1]
Parallax (π)17.64 ± 0.0224 mas[1]
Distance184.9 ± 0.2 ly
(56.69 ± 0.07 pc)
Absolute magnitude (MV)+2.69[6]
Details
Mass1.26[7] M☉
Radius4.01±0.20[8] R☉
Luminosity9.04±0.03[1] L☉
Surface gravity (log g)3.32±0.06[9] cgs
Temperature5,076±19[9] K
Metallicity [Fe/H]−0.11±0.02[9] dex
Rotational velocity (v sin i)<1.4[10] km/s
Age3.87+0.41
−0.42[1] Gyr
Other designations
34 G. Chamaeleontis[11], CD−78°476, CPD−78°677, GC 16083, HD 101917, HIP 57137, HR 4509, SAO 256865[12]
Database references
SIMBADdata

HD 101917, also designated as HR 4509, or rarely 34 G. Chamaeleontis,[11] is a solitary star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.38,[2] placing it near the limit for naked eye visibility. The object is located relatively close at a distance of 185 light years based on Gaia DR3 parallax measurements[1] but is receding with a heliocentric radial velocity of 33 km/s.[5] At its current distance, HD 101917's brightness is diminished by 0.28 magnitudes due to interstellar dust.[13] It has an absolute magnitude of +2.69.[6]

HD 101917 has a stellar classification of K0 III/IV,[3] indicating that it is an evolved K-type star with the blended luminosity class of a subgiant and a giant star. Gaia DR3 models it to be 3.9 billion years old,[1] enough time for it to cool and expand to 4.01 times the radius of the Sun.[8] At present it has 126% the mass of the Sun[7] and now radiates 9.04 times the luminosity of the Sun from its enlarged photosphere at an effective temperature 5,076 K,[9] giving it a yellow hue. HD 101917 has an iron abundance 22% below solar levels,[9] making it slightly metal deficient. It spins slowly with a projected rotational velocity lower than 1.4 km/s.[10]

  1. ^ a b c d e f g h Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference Hojjatpanah2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).