HD 94717

Last updated
HD 94717
Chamaeleon constellation map.svg
Red circle.svg
Location of HD 94717 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Chamaeleon [1]
Right ascension 10h 52m 28.63166s [2]
Declination −79° 33′ 33.9765″ [2]
Apparent magnitude  (V)6.34±0.01 [3]
Characteristics
Evolutionary stage red giant branch [2]
Spectral type K2 II/III [4]
U−B color index +1.57 [5]
B−V color index +1.46 [5]
Astrometry
Radial velocity (Rv)3.4±0.5 [6] km/s
Proper motion (μ)RA: −11.341 mas/yr [2]
Dec.: +1.655 mas/yr [2]
Parallax (π)1.8682±0.021  mas [2]
Distance 1,750 ± 20  ly
(535 ± 6  pc)
Absolute magnitude  (MV)−2.10 [7]
Details
Mass 6.3±0.7 [8]   M☉
Radius 77.8±3.9 [9]   R☉
Luminosity 1,847+46
−49 [2]   L☉
Surface gravity (log g)1.47±0.04 [2]   cgs
Temperature 4,446±122 [10]   K
Metallicity [Fe/H]−0.01 [2]   dex
Rotational velocity (v sin i)2.4±1.3 [11]  km/s
Age 63±20 [8]   Myr
Other designations
28 G. Chamaeleontis [12] , CD−78°438, CPD−78°589, GC 14988, HD 94717, HIP 53151, HR 4268, SAO 256768 [13]
Database references
SIMBAD data

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, [3] 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, [2] but it is receding with a heliocentric radial velocity of 3.4  km/s . [6] At its current distance, HD 94717's brightness is diminished by 0.62 magnitudes due to interstellar dust. [14]

HD 94717 has a stellar classification of K2 II/III, [4] 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, [8] enough time for it to cool and expand to 78 times the Sun's radius. [9] It has 6.3 times the mass of the Sun [8] and radiates 1,847 times the luminosity of the Sun [2] from its photosphere at an effective temperature of 4,446  K . [10] HD 94717 has a solar metallicity [2] and spins modestly with a projected rotational velocity of 2.4  km/s . [11]

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 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.
  3. 1 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.
  4. 1 2 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.
  5. 1 2 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.
  6. 1 2 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.
  7. ↑ 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.
  8. 1 2 3 4 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. 410 (1). Oxford University Press (OUP): 190–200. arXiv: 1007.4883 . Bibcode:2011MNRAS.410..190T. doi: 10.1111/j.1365-2966.2010.17434.x . ISSN   0035-8711.
  9. 1 2 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.
  10. 1 2 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.
  11. 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.
  12. ↑ 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.
  13. ↑ "HD 94717". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 8 December 2022.
  14. ↑ 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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