HD 85945

In this article we will explore the importance of HD 85945 in contemporary society. From its relevance in academia to its impact on everyday life, HD 85945 plays a fundamental role in our understanding of the world around us. Through a detailed analysis, we will examine the different aspects and dimensions of HD 85945, from its historical origins to its current applications. Likewise, we will consider the different perspectives and approaches that have emerged around HD 85945, thus enriching our overall understanding of this topic. This article seeks to delve into the relevance and meaning of HD 85945 in our current society, offering a panoramic view that allows the reader to understand its importance and scope in various contexts.

HD 85945
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major[1]
Right ascension 09h 57m 13.61s[2]
Declination +57° 25′ 05.54″[2]
Apparent magnitude (V) 5.959±0.009[2]
Characteristics
Evolutionary stage Horizontal branch[3]
Spectral type G6III:Fe-0.5[2]
Apparent magnitude (B) 6.854±0.015[2]
Apparent magnitude (G) 5.733[2]
Apparent magnitude (J) 4.513±0.028[2]
Apparent magnitude (H) 4.141±0.036[2]
Apparent magnitude (K) 3.978±0.3[2]
B−V color index 0.895[4]
Astrometry
Radial velocity (Rv)−46.55±0.12[5] km/s
Proper motion (μ) RA: 31.347 mas/yr[5]
Dec.: -61.766 mas/yr[5]
Parallax (π)7.4137±0.024 mas[5]
Distance432.08 ly
(132.54 pc)[5]
Absolute magnitude (MV)0.16[1]
Details
Mass2.5[3] M☉
Radius10.28±0.14[6] R☉
Luminosity77.62[7][a] L☉
Surface gravity (log g)2.6866[5] cgs
Temperature5281±22[6] K
Metallicity –0.4[7] dex
Rotational velocity (v sin i)7.53[4] km/s
Age660.7[3][b] Myr
Other designations
BD+58 1224, Gaia DR2 1046383298937140864, Gaia DR3 1046383298937140864, HIP 48802, HR 3922, PPM 32387, TIC 377368616, TYC 3817-1649-1, GSC 03817-01649, IRAS 09537+5739
Database references
SIMBADdata

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 it has a [Fe/H] metallicity of -0.5.[2] HD 85945 is 2.5 times more massive than the Sun and has expanded to 10.28 times the Sun's size.[3][6] It is emitting 78 times the solar luminosity from its photosphere at an effective temperature of 5,281 K.[7][6] Currently, the star is located in the horizontal branch stage of evolution.[3] The age of HD 85945 is estimated at 660 million years,[3] and it rotates under its axis at a speed of 7.53 km/s.[4] It is slightly metal-poor compared to the Sun, with an abundance of iron equivalent to 40% of the solar abundance.[7][c]

HD 85945 is located within the Ursa Major constellation. The distance to HD 85945 is of 132.54 parsecs (432.3 ly), based on spectra from Gaia DR3.[5] The apparent magnitude of the star is of 5.96,[2] which is brighter than the limiting magnitude for naked-eye vision (6.5m), making it faintly visible to the naked eye.[8] 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.[9] At the current distance, its brightness is diminished by 0.03 magnitudes due to interstellar extinction between Earth and the star.[6] HD 85945 is moving away from Earth at a velocity of 46.55 km/s.[5] It has a high proper motion in the sky.[6][2]

Notes

  1. ^ From a logarithm of 1.62.
  2. ^ from a logarithm of 8.82.
  3. ^ From a logarithm of -0.4

References

  1. ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  2. ^ a b c d e f g h i j k l "HD 85945". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 7, 2024.
  3. ^ a b c d e f 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.
  4. ^ a b c 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.
  5. ^ a b c d e f g 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.
  6. ^ a b c d e f 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. ^ 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. (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.
  9. ^ Ford, Dominic. "HIP-48802 (Star)". In-The-Sky.org. Retrieved 2024-05-07.