HD 94717

HD 94717, also known as HR 4268, is a solitary orange hued star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.34,[2] placing it near the limit for naked eye visibility. The object is located relatively far at a distance of 1,750 light years based on Gaia DR3 parallax measurements,[1] but it is receding with a heliocentric radial velocity of 3.4 km/s.[5] At its current distance, HD 94717's brightness is diminished by 0.62 magnitudes due to interstellar dust.[13]

HD 94717
Location of HD 94717 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Chamaeleon
Right ascension 10h 52m 28.63166s[1]
Declination −79° 33′ 33.9765″[1]
Apparent magnitude (V) 6.34±0.01[2]
Characteristics
Spectral type K2 II/III[3]
U−B color index +1.57[4]
B−V color index +1.46[4]
Astrometry
Radial velocity (Rv)3.4±0.5[5] km/s
Proper motion (μ) RA: −11.341 mas/yr[1]
Dec.: +1.655 mas/yr[1]
Parallax (π)1.8682 ± 0.021 mas[1]
Distance1,750 ± 20 ly
(535 ± 6 pc)
Absolute magnitude (MV)−2.10[6]
Details
Mass6.3±0.7[7] M☉
Radius77.8±3.9[8] R☉
Luminosity1,847+46
−49[1] L☉
Surface gravity (log g)1.47±0.04[1] cgs
Temperature4,446±122[9] K
Metallicity [Fe/H]−0.01[1] dex
Rotational velocity (v sin i)2.4±1.3[10] km/s
Age63±20[7] Myr
Other designations
28 G. Chamaeleontis[11], CD−78°438, CPD−78°589, GC 14988, HD 94717, HIP 53151, HR 4268, SAO 256768[12]
Database references
SIMBADdata

HD 94717 has a stellar classification of K2 II/III,[3] indicating that it is an evolved red giant with the blended luminosity class of a giant star and a bright giant. It is estimated to be 63 million years old,[7] enough time for it to cool and expand to 78 times the Sun's radius.[8] It has 6.3 times the mass of the Sun[7] and radiates 1,847 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 4,446 K.[9] HD 94717 has a solar metallicity[1] and spins modestly with a projected rotational velocity of 2.4 km/s.[10]

References
  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. Corbally, C. J.; Garrison, R. F. (1984). "Which Map of Absolute Magnitudes: Keenan or Schmidt-Kaler?". The Mk Process and Stellar Classification: 277. Bibcode:1984mpsc.conf..277C.
  7. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (October 12, 2010). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. Oxford University Press (OUP). 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711.
  8. 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.
  9. Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
  10. 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. 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.
  12. "HD 94717". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 December 2022.
  13. Guarinos, J. (February 1995). "VizieR Online Data Catalog: Interstellar matter in the Galactic Disk (Guarinos J., 1992)". VizieR Online Data Catalog: 301V/86. Bibcode:1995yCat.5086....0G.
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