HD 66920
Observation data
Epoch J2000      Equinox J2000
Constellation Volans
Right ascension 07h 59m 15.7648s[1]
Declination −73° 14′ 39.0155″[1]
Apparent magnitude (V) 6.33±0.01[2]
Characteristics
Evolutionary stage main sequence[1]
Spectral type A3 V[3]
U−B color index +0.13[4]
B−V color index +0.14[4]
Astrometry
Radial velocity (Rv)23.8±1.7[5] km/s
Proper motion (μ) RA: −5.984 mas/yr[1]
Dec.: −20.295 mas/yr[1]
Parallax (π)7.6204 ± 0.0251 mas[1]
Distance428 ± 1 ly
(131.2 ± 0.4 pc)
Absolute magnitude (MV)+0.76[6]
Details
Mass2.33[7] M☉
Radius3.53+0.13
−0.11[8] R☉
Luminosity42±2[9] L☉
Surface gravity (log g)3.65±0.08[8] cgs
Temperature8,247±95[10] K
Metallicity [Fe/H]−0.01[11] dex
Age711[1] Myr
Other designations
20 G. Volantis[12], CD−72°431, CPD−72°654, GC 10898, HD 66920, HIP 39041, HR 3171, SAO 256463[13]
Database references
SIMBADdata

HD 66920, also known as HR 3171, is a solitary, white hued star located in the southern circumpolar constellation Volans, the flying fish. It has an apparent magnitude of 6.33,[2] placing it near the limit for naked eye visibility. Based on parallax measurements from the Gaia spacecraft, the star is estimated to be 428 light years distant.[1] It appears to be receding from the Solar System, having a heliocentric radial velocity of 23.8 km/s.[5] Pauzen et al. (2001) listed it as a λ Boötis star,[3] but is now considered a non member.[14]

HD 66920 has a classification of A3 V,[3] indicating that it is an ordinary A-type main-sequence star. Although it has been classified as a giant star (III),[15] HR 3171 is still on the main sequence[1] (according to Gaia DR3 models). It has 2.33 times the mass of the Sun and an enlarged radius of 3.53 R☉.[8] It radiates 42 times the luminosity of the Sun[9] from its enlarged photosphere at an effective temperature of 8,247 K.[10] HD 66920 has a solar metallicity,[11] and is estimated to be 711 million years old.[1]

References

  1. 1 2 3 4 5 6 7 8 9 10 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. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (1 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. 1 2 3 Paunzen, E.; Duffee, B.; Heiter, U.; Kuschnig, R.; Weiss, W. W. (July 2001). "A spectroscopic survey for λ Bootis stars". Astronomy & Astrophysics. 373 (2): 625–632. Bibcode:2001A&A...373..625P. doi:10.1051/0004-6361:20010630. eISSN 1432-0746. ISSN 0004-6361.
  4. 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.
  5. 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.
  6. ↑ 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.
  7. ↑ Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
  8. 1 2 3 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.
  9. 1 2 Murphy, Simon J.; Paunzen, Ernst (5 December 2016). "Gaia's view of the λ Boo star puzzle". Monthly Notices of the Royal Astronomical Society. 466 (1): 546–555. arXiv:1612.01528. Bibcode:2017MNRAS.466..546M. doi:10.1093/mnras/stw3141. eISSN 1365-2966. ISSN 0035-8711.
  10. 1 2 Paunzen, E.; Schnell, A.; Maitzen, H. M. (October 2006). "An empirical temperature calibration for the Δa photometric system II: The A-type and mid F-type stars". Astronomy & Astrophysics. 458 (1): 293–296. arXiv:astro-ph/0607567. Bibcode:2006A&A...458..293P. doi:10.1051/0004-6361:20064889. eISSN 1432-0746. ISSN 0004-6361.
  11. 1 2 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. ISSN 0320-0108. S2CID 255201789.
  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 66920". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 7, 2022.
  14. ↑ Murphy, Simon J.; Corbally, Christopher J.; Gray, Richard O.; Cheng, Kwang-Ping; Neff, James E.; Koen, Chris; Kuehn, Charles A.; Newsome, Ian; Riggs, Quinlin (2015). "An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue". Publications of the Astronomical Society of Australia. 32. arXiv:1508.03633. Bibcode:2015PASA...32...36M. doi:10.1017/pasa.2015.34. eISSN 1448-6083. ISSN 1323-3580.
  15. ↑ 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.
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