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  • 21 Aug, 2019

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HD 85945
HD 85945 (HR 3922) is a star in the constellation Ursa Major. It is a yellow giant star with a spectral type of G6III:Fe-0.5. Based on information from Gaia DR3, it is located 132.54 parsecs (432.3 ly) from Earth and is moving towards Earth at a velocity of 47 km/s. It has an apparent magnitude of 5.96, which makes it faintly visible to the naked eye.

Characteristics

It is an evolved G-type giant star, based on its spectral type of G6III:Fe-0.5, which also indicates that is has a [Fe/H] metallicity of -0.5. HD 85945 is 2.5 times more massive than the Sun and has expanded to 10.28 times the Sun's size. It is emitting 78 times the solar luminosity from its photosphere at an effective temperature of 5,281 K. Currently, the star is located in the horizontal branch stage of evolution. The age of HD 85945 is estimated at 660 million years, and it rotates under its axis at a speed of 7.53 km/s. It is slightly metal-poor compared to the Sun, with an abundance of iron equivalent to 40% of the solar abundance.

HD 85945 is located within the Ursa Major constellation, based on its celestial coordinates. The distance to HD 85945 is of 132.54 parsecs (432.3 ly), based on spectra from Gaia DR3. The apparent magnitude of the star is of 5.96, which is brighter than the limiting magnitude for naked-eye vision (6.5), making it faintly visible to the naked eye. The absolute magnitude, i.e. the brightness of the star if it was seen at a distance of 10 parsecs (32.6 ly), is 0.32. At the current distance, its brightness is diminished by 0.03 magnitudes due to interstellar extinction between Earth and the star. HD 85945 is moving away from Earth at a velocity of 46.55 km/s. It has a high proper motion in the sky.

Notes

  1. ^ Obtained with a right ascension of 09 57 13.61 and a declination of +57° 25′ 05.54″ on this website.
  2. ^ From a logarithm of 1.62.
  3. ^ from a logarithm of 8.82.
  4. ^ From a logarithm of -0.4

References

  1. ^ "HD 85945". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 7, 2024.
  2. ^ Stock, Stephan; Reffert, Sabine; Quirrenbach, Andreas (2018-08-01). "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search". Astronomy and Astrophysics. 616: A33. arXiv:1805.04094. Bibcode:2018A&A...616A..33S. doi:10.1051/0004-6361/201833111. ISSN 0004-6361. Data about this star is available here in VizieR.
  3. ^ Hekker, S.; Meléndez, J. (2007-12-01). "Precise radial velocities of giant stars. III. Spectroscopic stellar parameters". Astronomy and Astrophysics. 475 (3): 1003–1009. arXiv:0709.1145. Bibcode:2007A&A...475.1003H. doi:10.1051/0004-6361:20078233. ISSN 0004-6361. Data about this star is avalilable here in VizieR.
  4. ^ 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.
  5. ^ Ford, Dominic. "HIP-48802 (Star)". In-The-Sky.org. Retrieved 2024-05-07.
  6. ^ Ren, J. -J.; Raddi, R.; Rebassa-Mansergas, A.; Hernandez, M. S.; Parsons, S. G.; Irawati, P.; Rittipruk, P.; Schreiber, M. R.; Gänsicke, B. T.; Torres, S.; Wang, H. -J.; Zhang, J. -B.; Zhao, Y.; Zhou, Y. -T.; Han, Z. -W. (2020-12-01). "The White Dwarf Binary Pathways Survey. V. The Gaia White Dwarf Plus AFGK Binary Sample and the Identification of 23 Close Binaries". The Astrophysical Journal. 905 (1): 38. arXiv:2010.02885. Bibcode:2020ApJ...905...38R. doi:10.3847/1538-4357/abc017. ISSN 0004-637X. Data about this star is available here in VizieR.
  7. ^ Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (2020-01-01). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy and Astrophysics. 633: A34. arXiv:1910.12732. Bibcode:2020A&A...633A..34C. doi:10.1051/0004-6361/201936360. ISSN 0004-6361. Data about this star is available here in VizieR.
  8. ^ "University Lowbrow Astronomers Naked Eye Observer's Guide". websites.umich.edu. Retrieved 2024-05-07.
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