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

HD 88809 has a classification of K1 III 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, which yields a diameter of 17.07 times that of the Sun at its estimated distance. At present HD 88809 has 129% the mass of the Sun and shines with a luminosity approximately 117 times that of the Sun and has a surface temperature of 4,410 K, which gives it an orange glow of a K-type star. HD 88809 has a faint 13th magnitude companion located approximately 4.9″ away.

References

1. ^ 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. ^ 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. (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. ^ 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 "Compilation of Eggen's UBV data, transformed to UBV (unpublished)".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. ^ 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. ^ 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:

   ${\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(138\cdot 1.15\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 34.14\cdot R_{\bigodot }\end{aligned}}}$

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. ^ 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.

v t e Constellation of Antlia
List of stars in Antlia
Stars	Bayer α δ ε ζ ζ η θ ι Variable S T U V UX AG BF HR 3770 3790 3812 3830 3833 3916 3932 3992 4015 4019 4086 4183 4194 4238 4313 HD 88522 93083 (Macondo) Other 2MASS 0939−2448 DEN 1048−3956 WASP-66
Exoplanets HD 93083 b
Galaxies	NGC 2997 3001 3087 3125 3175 3223 3244 3258 3260 3267 3268 3269 3271 3281 Other Antlia II Antlia Dwarf IC 2531 IC 2560
Galaxy clusters Antlia Cluster NGC 2997 Group
Category

• Antlia
• Henry Draper Catalogue objects
• Double stars
• K-type giants
• Bright Star Catalogue objects
• Hipparcos objects
• Durchmusterung objects