Astronomy:HD 58425

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Short description: Binary star in the constellation Camelopardalis
HD 58425
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Camelopardalis
Right ascension  07h 30m 52.66467s[1]
Declination +68° 27′ 56.3270″[1]
Apparent magnitude (V) 5.64±0.01[2]
Characteristics
Evolutionary stage red giant branch[1]
Spectral type K2 III[3]
B−V color index +1.11[4]
Astrometry
Radial velocity (Rv)58.6±0.2[5] km/s
Proper motion (μ) RA: −2.031[1] mas/yr
Dec.: −42.687[1] mas/yr
Parallax (π)6.9858 ± 0.2644[1] mas
Distance470 ± 20 ly
(143 ± 5 pc)
Absolute magnitude (MV)−0.05[6]
Details
Mass1.74±0.52[7] M☉
Radius24.7[8] R☉
Luminosity199+24−22[9] L☉
Surface gravity (log g)2.4±0.1[10] cgs
Temperature4,479±62[8] K
Metallicity [Fe/H]−0.42±0.04[10] dex
Age3.55+0.52−0.46[7] Gyr
Other designations
54 H. Ursae Majoris,[11] BD+68°480, FK5 284, GC 9985, HD 58425, HIP 36528, HR 2830, SAO 14211[12]
Database references
SIMBADdata

HD 58425, also known as HR 2830, is an astrometric binary[13] (100% chance[14]) located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye as an orang point of light at an apparent magnitude of 5.64.[2] Based on parallax measurements from Gaia DR3, the system is estimated to be 470 light years away from Earth.[1] It appears to be rapidly receding from the Sun, having a heliocentric radial velocity of 58.6 km/s.[5] HD 58425 is listed as 54 Ursae Majoris in Johann Hevelius' catalogue,[11] but this was dropped after the official IAU's official constellation borders were drawn.

The visible component is an evolved, RGB star with a stellar classification of K2 III.[3] It has 1.74 times the mass of the Sun and is said to be 3.55 billion years old.[7] At this age, the object has expanded to 24.7 times the radius of the Sun[8] and now radiates nearly 200 times the luminosity of the Sun[9] from its enlarged photosphere at an effective temperature of 4,479 K.[8] HD 58425 A has an iron abundance only 38% that of the Sun's,[10] making it metal deficient.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Adams, Walter S.; Joy, Alfred H.; Humason, Milton L.; Brayton, Ada Margaret (April 1935). "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars". The Astrophysical Journal 81: 187. doi:10.1086/143628. ISSN 0004-637X. Bibcode: 1935ApJ....81..187A. 
  4. ↑ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode: 1970Priv.........0H. 
  5. ↑ 5.0 5.1 Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics 430: 165. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F. 
  6. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 Feuillet, Diane K.; Bovy, Jo; Holtzman, Jon; Girardi, Léo; MacDonald, Nick; Majewski, Steven R.; Nidever, David L. (20 January 2016). "Determining Ages of APOGEE Giants with Known Distances". The Astrophysical Journal 817 (1): 40. doi:10.3847/0004-637X/817/1/40. Bibcode: 2016ApJ...817...40F. 
  8. ↑ 8.0 8.1 8.2 8.3 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  9. ↑ 9.0 9.1 Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R. et al. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics 633: A34. doi:10.1051/0004-6361/201936360. ISSN 0004-6361. Bibcode: 2020A&A...633A..34C. 
  10. ↑ 10.0 10.1 10.2 Sprague, Dani et al. (8 March 2022). "APOGEE Net: An Expanded Spectral Model of Both Low-mass and High-mass Stars". The Astronomical Journal 163 (4): 152. doi:10.3847/1538-3881/ac4de7. ISSN 0004-6256. Bibcode: 2022AJ....163..152S. 
  11. ↑ 11.0 11.1 Verbunt, F.; van Gent, R. H. (June 2010). "The star catalogue of Hevelius". Astronomy and Astrophysics 516: A29. doi:10.1051/0004-6361/201014003. ISSN 0004-6361. Bibcode: 2010A&A...516A..29V. 
  12. ↑ "HD 58425". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+58425. 
  13. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  14. ↑ Frankowski, A.; Jancart, S.; Jorissen, A. (19 December 2006). "Proper-motion binaries in the Hipparcos catalogue". Astronomy & Astrophysics 464 (1): 377–392. doi:10.1051/0004-6361:20065526. ISSN 0004-6361. Bibcode: 2007A&A...464..377F. 



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