High proper motion star
HD 101917 , also designated as HR 4509 , or rarely 34 G. Chamaeleontis , is a solitary star located in the southern circumpolar constellation Chamaeleon . It has an apparent magnitude of 6.38, 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 but is receding with a heliocentric radial velocity of 33 km/s . At its current distance, HD 101917's brightness is diminished by 0.28 magnitudes due to interstellar dust . It has an absolute magnitude of +2.69.
HD 101917 has a stellar classification of K0 III/IV, 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, enough time for it to cool and expand to 4.01 times the radius of the Sun . At present it has 126% the mass of the Sun and now radiates 9.04 times the luminosity of the Sun from its enlarged photosphere at an effective temperature 5,076 K , giving it a yellow hue. HD 101917 has an iron abundance 22% below solar levels, making it slightly metal deficient. It spins slowly with a projected rotational velocity lower than 1.4 km/s .
References
^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 . Bibcode :2023A&A...674A...1G . doi :10.1051/0004-6361/202243940 . S2CID 244398875 .
Gaia DR3 record for this source at VizieR .
^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics . 355 : L27–L30. Bibcode :2000A&A...355L..27H . ISSN 0004-6361 .
^ Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53° . Bibcode :1975mcts.book.....H .
^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory . 4 : 99–110. Bibcode :1966CoLPL...4...99J .
^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters . 32 (11): 759–771. arXiv :1606.08053 . Bibcode :2006AstL...32..759G . doi :10.1134/S1063773706110065 . eISSN 1562-6873 . ISSN 1063-7737 . S2CID 119231169 .
^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331–346. arXiv :1108.4971 . Bibcode :2012AstL...38..331A . doi :10.1134/S1063773712050015 . eISSN 1562-6873 . ISSN 1063-7737 . S2CID 119257644 .
^ Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18" . Astronomy & Astrophysics . 628 : A94. arXiv :1904.11302 . Bibcode :2019A&A...628A..94A . doi :10.1051/0004-6361/201935765 . eISSN 1432-0746 . ISSN 0004-6361 .
^ Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants" . Astronomy & Astrophysics . 426 (1): 297–307. arXiv :astro-ph/0404180 . Bibcode :2004A&A...426..297K . doi :10.1051/0004-6361:20035930 . eISSN 1432-0746 . ISSN 0004-6361 .
^ Hojjatpanah, S.; et al. (September 2019). "Catalog for the ESPRESSO blind radial velocity exoplanet survey" . Astronomy & Astrophysics . 629 : A80. arXiv :1908.04627 . Bibcode :2019A&A...629A..80H . doi :10.1051/0004-6361/201834729 . eISSN 1432-0746 . ISSN 0004-6361 .
^ 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 .
^ 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 .
"HD 101917" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved January 10, 2023.Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars" . Monthly Notices of the Royal Astronomical Society . 472 (4): 3805–3820. arXiv :1709.01160 . Bibcode :2017MNRAS.472.3805G . doi :10.1093/mnras/stx2219 . eISSN 1365-2966 . ISSN 0035-8711 .
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Location of HD 101917 on the map (circled)
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