Astronomy:HD 45866

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Short description: Star in the constellation of Camelopardalis
HD 45866
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 45866 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Camelopardalis
Right ascension  06h 40m 28.87701s[1]
Declination +77° 59′ 44.8179″[1]
Apparent magnitude (V) 5.72±0.01[2]
Characteristics
Spectral type K5 III[3]
B−V color index +1.47[4]
Astrometry
Radial velocity (Rv)−16.6±0.2[5] km/s
Proper motion (μ) RA: +13.997[1] mas/yr
Dec.: −5.701[1] mas/yr
Parallax (π)4.4952 ± 0.0455[1] mas
Distance726 ± 7 ly
(222 ± 2 pc)
Absolute magnitude (MV)−0.89[6]
Details
Mass2.34±0.69[7] M☉
Radius49.6±2.6[8] R☉
Luminosity468±8[1] L☉
Surface gravity (log g)1.62±0.11[7] cgs
Temperature4,207±140[9] K
Metallicity [Fe/H]−0.11±0.01[10] dex
Age1.15+0.51−0.35[7] Gyr
Other designations
BD+78°227, FK5 2507, GC 8574, HD 45866, HIP 31940, HR 2363, SAO 5919[11]
Database references
SIMBADdata

HD 45866, also known as HR 2363 is a solitary star[12] located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.72.[2] Gaia DR3 parallax measurements place it 726 light years away and it is currently approaching the Solar System with a heliocentric radial velocity of −16.6 km/s.[5] At its current distance, HD 45866's brightness is diminished by 0.26 magnitudes due to interstellar dust.[13] It has an absolute magnitude of −0.89[6]

This is an evolved red giant with a stellar classification of K5 III.[3] It has 2.34 times the mass of the Sun[7] but it has expanded to nearly 50 times the radius of the Sun[8] at an age of 1.15 billion years.[7] It radiates 468 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 4,207 K.[9] It has an iron abundance 78% of the Sun's,[10] making it slightly 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. ISSN 0004-6361. Bibcode: 2005A&A...430..165F. 
  6. ↑ 6.0 6.1 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 7.3 7.4 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 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics 426 (1): 297–307. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  9. ↑ 9.0 9.1 Bai, Yu; Liu, JiFeng; Bai, ZhongRui; Wang, Song; Fan, DongWei (2 August 2019). "Machine-learning Regression of Stellar Effective Temperatures in the Second Gaia Data Release". The Astronomical Journal 158 (2): 93. doi:10.3847/1538-3881/ab3048. Bibcode: 2019AJ....158...93B. 
  10. ↑ 10.0 10.1 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. ↑ "HD 45866". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+45866. 
  12. ↑ 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. 
  13. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 



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