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HD 88809
Observation data; Epoch J2000 Equinox J2000
Constellation	Antlia
Right ascension	10h 13m 45.9269s
Declination	−40° 20′ 45.6832″
Apparent magnitude (V)	5.893±0.009
Characteristics
Spectral type	K1 III
U−B color index	+1.25
B−V color index	+1.21
Astrometry
Radial velocity (Rv)	19.96±0.76 km/s
Proper motion (μ)	RA: −79.460 mas/yr ; Dec.: +2.511 mas/yr
Parallax (π)	7.2269 ± 0.0909 mas
Distance	451 ± 6 ly ; (138 ± 2 pc)
Absolute magnitude (MV)	+0.19
Details
Mass	1.29+1.20; −0.4 M☉
Radius	17.07 R☉
Luminosity	117±8 L☉
Temperature	4,410±110 K
Metallicity [Fe/H]	−0.2 dex
Rotational velocity (v sin i)	<1.3 km/s
Age	4.9 Gyr
Position (relative to HD 88809A)
Component	HD 88809B
Epoch of observation	J2000.0
Angular distance	4.9″
Position angle	105°
Projected separation	676.2 AU
Other designations
	55 G. Antliae, CD−39° 6222, HD 88809, HIP 50103, HR 4015, SAO 22187
Database references
SIMBAD	data

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

^ ^a ^b ^c ^d ^e ^f ^g ^h 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.
^ ^a ^b 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.
^ ^a ^b 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.
^ ^a ^b Mermilliod, J. -C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data: 0. Bibcode:1986EgUBV........0M.
^ ^a ^b ^c ^d 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.
^ ^a ^b 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:
${\begin{aligned}2\cdot R_{*}&={\frac {(138\cdot 1.15\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 34.14\cdot R_{\bigodot }\end{aligned}}$
^ 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.
^ "Digital Demo Room - Stellar Structure and Evolution Simulator". rainman.astro.illinois.edu.
^ ^a ^b 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.
^ 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.

[GaiaDR2-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h 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.

[Hog2000-2] 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.

[Houk1982-3] 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.

[Mermilliod1986-4] Mermilliod, J. -C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data: 0. Bibcode:1986EgUBV........0M.

[Charbonnel2020-5] 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.

[Lang2006-6] 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:
${\begin{aligned}2\cdot R_{*}&={\frac {(138\cdot 1.15\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 34.14\cdot R_{\bigodot }\end{aligned}}$

[DeMederios2014-7] 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.

[DDR-8] "Digital Demo Room - Stellar Structure and Evolution Simulator". rainman.astro.illinois.edu.

[Mason2001-9] 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.

[Stassun2017-10] 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.

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