HD 157819

Last updated
HD 157819
Observation data
Epoch J2000       Equinox J2000
Constellation Ara [1]
Right ascension 17h 28m 38.91416s [2]
Declination −55° 10′ 10.8720″ [2]
Apparent magnitude  (V)5.94 [3]
Characteristics
Spectral type G8 II-III [4]
B−V color index +1.11 [3]
Astrometry
Radial velocity (Rv)−12.6±0.4 [5] km/s
Proper motion (μ)RA: +2.52 [2] mas/yr
Dec.: −8.92 [2] mas/yr
Parallax (π)3.31±0.41  mas [2]
Distance approx. 1,000  ly
(approx. 300  pc)
Absolute magnitude  (MV)−2.9 [6]
Details
Mass 2.5 [7]   M☉
Radius 31 [8]   R☉
Luminosity 444 [9]   L☉
Surface gravity (log g)2.22 [7]   cgs
Temperature 4,895 [8]   K
Metallicity [Fe/H]−0.13 [7]   dex
Rotational velocity (v sin i)6.4 [10]  km/s
Other designations
HD 157819, HIP 85520, HR 6487, SAO 244770 [11]
Database references
SIMBAD data

HD 157819 is the Henry Draper Catalogue designation for a star in the southern constellation of Ara. It is faintly visible to the naked eye at an apparent visual magnitude of 5.94 [3] and is approximately 1,000 light-years (310 parsecs ) distant from the Earth. [2] The spectrum of this star fits a stellar classification of G8 II-III, [4] indicating it is a G-type star that is somewhere between a giant and bright giant.

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752 , Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID   18759600.
  3. 1 2 3 Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
  4. 1 2 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  5. ↑ 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, S2CID   119231169.
  6. ↑ Eggen, O. J. (August 1983), "The reddening, metal abundance, and luminosity of high-luminosity G-type stars", Astronomical Journal, 88: 1187–1198, Bibcode:1983AJ.....88.1187E, doi: 10.1086/113409 .
  7. 1 2 3 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv: 2407.06963 . Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
  8. 1 2 Stassun, Keivan G.; et al. (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 .
  9. ↑ 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.
  10. ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics. 561: A126. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762.
  11. ↑ "HR 6487 -- Star in double system", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg , retrieved 2012-08-04.


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