HD 88809
Observation data
Epoch J2000      Equinox J2000
Constellation Antlia
Right ascension 10h 13m 45.9269s[1]
Declination −40° 20′ 45.6832″[1]
Apparent magnitude (V) 5.893±0.009[2]
Characteristics
Spectral type K1 III[3]
U−B color index +1.25[4]
B−V color index +1.21[4]
Astrometry
Radial velocity (Rv)19.96±0.76[1] km/s
Proper motion (μ) RA: −79.460[1] mas/yr
Dec.: +2.511[1] mas/yr
Parallax (π)7.2269 ± 0.0909 mas[1]
Distance451 ± 6 ly
(138 ± 2 pc)
Absolute magnitude (MV)+0.19
Details[5]
Mass1.29+1.20
−0.4 M☉
Radius17.07[6] R☉
Luminosity117±8 L☉
Temperature4,410±110 K
Metallicity [Fe/H]−0.2 dex
Rotational velocity (v sin i)<1.3[7] km/s
Age4.9[8] Gyr
Position (relative to HD 88809A)[9]
ComponentHD 88809B
Epoch of observationJ2000.0
Angular distance4.9″
Position angle105°
Projected separation676.2 AU
Other designations
55 G. Antliae, CD−39° 6222, HD 88809, HIP 50103, HR 4015, SAO 22187
Database references
SIMBADdata

HD 88809 is a star located in the southern constellation Antlia. With an apparent magnitude of 5.89[2] it is barely visible to the naked eye under ideal conditions. The star is located at a distance of around 451 light years[1] but is drifting away at a heliocentric radial velocity of almost 20 km/s.[1]

HD 88809 has a classification of K1 III[3] which indicates that it is an evolved early K-type giant star that has exhausted hydrogen at its core and left the main sequence. It has an angular diameter of 1.15 mas,[10] which yields a diameter of 17.07[6] times that of the Sun at its estimated distance. At present HD 88809 has 129%[5] the mass of the Sun and shines with a luminosity approximately 117[5] times that of the Sun and has a surface temperature of 4,410 K,[5] which gives it an orange glow of a K-type star. HD 88809 has a faint 13th magnitude companion located approximately 4.9″ away.[9]

References

  1. 1 2 3 4 5 6 7 8 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 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. (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 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. Bibcode:1982mcts.book.....H.
  4. 1 2 Mermilliod, J. -C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data: 0. Bibcode:1986EgUBV........0M.
  5. 1 2 3 4 Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics. 633: A34. arXiv:1910.12732. Bibcode:2020A&A...633A..34C. doi:10.1051/0004-6361/201936360. ISSN 0004-6361.
  6. 1 2 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
  7. ↑ 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: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
  8. ↑ "Digital Demo Room - Stellar Structure and Evolution Simulator". rainman.astro.illinois.edu.
  9. 1 2 Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
  10. ↑ Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (3 March 2017). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal. 153 (3): 136. arXiv:1609.04389. Bibcode:2017AJ....153..136S. doi:10.3847/1538-3881/aa5df3. ISSN 0004-6256.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.