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] |
| Distance | 451 ± 6 ly (138 ± 2 pc) |
| Absolute magnitude (MV) | +0.19 |
| Details[5] | |
| Mass | 1.29+1.20 −0.4 M☉ |
| Radius | 17.07[6] R☉ |
| Luminosity | 117±8 L☉ |
| Temperature | 4,410±110 K |
| Metallicity [Fe/H] | −0.2 dex |
| Rotational velocity (v sin i) | <1.3[7] km/s |
| Age | 4.9[8] Gyr |
| Position (relative to HD 88809A)[9] | |
| Component | HD 88809B |
| Epoch of observation | J2000.0 |
| Angular distance | 4.9″ |
| Position angle | 105° |
| Projected separation | 676.2 AU |
| Other designations | |
| 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
[edit]- ^ 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:
- ^ 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.
