HD 101917

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HD 101917
Chamaeleon constellation map.svg
Red circle.svg
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]
Distance 184.9 ± 0.2  ly
(56.69 ± 0.07  pc)
Absolute magnitude  (MV)+2.69 [6]
Details
Mass 1.26 [7]   M☉
Radius 4.01±0.20 [8]   R☉
Luminosity 9.04±0.03 [1]   L☉
Surface gravity (log g)3.32±0.06 [9]   cgs
Temperature 5,076±19 [9]   K
Metallicity [Fe/H]−0.11±0.02 [9]   dex
Rotational velocity (v sin i)<1.4 [10]  km/s
Age 3.87+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
SIMBAD data

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]

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<span class="mw-page-title-main">HD 174500</span> Star in the constellation of Telescopium

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<span class="mw-page-title-main">HD 189080</span> Star in the constellation of Telescopium

HD 189080, also known as HR 7621 or rarely 74 G. Telescopii, is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.18, placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements place it at a distance of 357 light years and it is currently receding rapidly with a heliocentric radial velocity of 66.9 km/s. At its current distance, HD 189080's brightness is diminished by 0.17 magnitudes due to extinction from interstellar dust. It has an absolute magnitude of +1.1.

<span class="mw-page-title-main">HD 170873</span> K-type giant; Telescopium

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<span class="mw-page-title-main">HD 185075</span> Star in the constellation Telescopium

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<span class="mw-page-title-main">HD 186756</span> K-type giant; Telescopium

HD 186756, also known as HR 7521 or rarely 68 G. Telescopii, is a solitary orange hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.25, placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 743 light years; it is currently approaching with a heliocentric radial velocity of −21.2 km/s. At its current distance, HD 186756's brightness is diminished by 0.34 magnitudes due to extinction from interstellar dust and it has an absolute magnitude of −0.96.

<span class="mw-page-title-main">HD 169853</span> Am star; Corona Australis

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References

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  10. 1 2 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762 . eISSN   1432-0746. ISSN   0004-6361.
  11. 1 2 Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
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