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HD 50885
Observation data
Epoch J2000       Equinox J2000
Constellation Camelopardalis
Right ascension 07h 01m 21.41899s [1]
Declination +70° 48′ 29.8635″ [1]
Apparent magnitude (V) 5.69±0.01 [2]
Characteristics
Evolutionary stage red giant branch [3]
Spectral type K4 III [4]
U−B color index +1.52 [2]
B−V color index +1.34 [2]
Astrometry
Radial velocity (Rv)−17.8±0.2 [5] km/s
Proper motion (μ) RA: +13.101  mas/ yr [1]
Dec.: −15.749  mas/ yr [1]
Parallax (π)6.3572 ± 0.0481  mas [1]
Distance513 ± 4  ly
(157 ± 1  pc)
Absolute magnitude (MV)−0.27 [6]
Details
Mass1.32±0.82 [7]  M☉
Radius30.43 [8]  R☉
Luminosity203±3 [1]  L☉
Surface gravity (log g)1.99 [9]  cgs
Temperature4,396±122 [10]  K
Metallicity [Fe/H]+0.01 [9]  dex
Age292 [1]  Myr
Other designations
AG+70°299, BD+70°430, GC 9152, HD 50885, HIP 33827, HR 2581, SAO 6041, WDS J07014+7049A [11]
Database references
SIMBAD data

HD 50885, also known as HR 2581, is a star located in the northern circumpolar constellation Camelopardalis, the giraffe. It has an apparent magnitude of 5.69, [2] making it faintly visible to the naked eye if viewed under ideal conditions. Based on parallax measurements from Gaia DR3, the object is estimated to be 513 light years distant. [1] It appears to be approaching the Solar System with a heliocentric radial velocity of −17.8  km/s. [5]

This is a solitary, [12] evolved red giant star with a stellar classification of K4 III. [4] It is currently on the red giant branch, [3] fusing a hydrogen shell around an inert helium core. It has 1.32 times the mass of the Sun [7] but has expanded to 30.4 times its girth. [8] It radiates 203 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 4,396  K. [10] HD 50885 has an iron abundance only 102% that of the Sun, placing it at solar metallicity. [9]

There is an optical companion located 119 ″ away along a position angle of 357°. [13] This object was first noticed by Robert S. Ball in 1879 [14]

References

  1. ^ a b c d e f g h 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.
  2. ^ a b c d Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI". Astronomy and Astrophysics Supplement Series. 89: 415. Bibcode: 1991A&AS...89..415O. ISSN  0365-0138.
  3. ^ a b Cardiel, Nicolás; Zamorano, Jaime; Carrasco, Josep Manel; Masana, Eduard; Bará, Salvador; González, Rafael; Izquierdo, Jaime; Pascual, Sergio; Sánchez de Miguel, Alejandro (23 July 2021). "RGB photometric calibration of 15 million Gaia stars". Monthly Notices of the Royal Astronomical Society. 507 (1): 318–329. arXiv: 2107.08734. Bibcode: 2021MNRAS.507..318C. doi: 10.1093/mnras/stab2124. eISSN  1365-2966. ISSN  0035-8711.
  4. ^ a b Wilson, Ralph E.; Joy, Alfred H. (March 1950). "Radial Velocities of 2111 Stars". The Astrophysical Journal. 111: 221. Bibcode: 1950ApJ...111..221W. doi: 10.1086/145261. eISSN  1538-4357. ISSN  0004-637X.
  5. ^ a b 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. arXiv: astro-ph/0409579. Bibcode: 2005A&A...430..165F. doi: 10.1051/0004-6361:20041272. S2CID  17804304.
  6. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. eISSN  1562-6873. ISSN  1063-7737. S2CID  119257644.
  7. ^ a b Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics. 633: A34. arXiv: 1910.12732. Bibcode: 2020A&A...633A..34C. doi: 10.1051/0004-6361/201936360. eISSN  1432-0746. ISSN  0004-6361.
  8. ^ a b Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912. Bibcode: 2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146. eISSN  1432-0746. ISSN  0004-6361.
  9. ^ a b c Lomaeva, M.; Jönsson, H.; Ryde, N.; Schultheis, M.; Thorsbro, B. (May 2019). "Abundances of disk and bulge giants from high-resolution optical spectra". Astronomy & Astrophysics. 625: A141. arXiv: 1903.01476. Bibcode: 2019A&A...625A.141L. doi: 10.1051/0004-6361/201834247. eISSN  1432-0746. ISSN  0004-6361.
  10. ^ a b Stassun, Keivan G.; et al. (9 September 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. eISSN  1538-3881.
  11. ^ "HD 50855". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 11, 2022.
  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. arXiv: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. eISSN  1365-2966. ISSN  0035-8711.
  13. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode: 2001AJ....122.3466M. doi: 10.1086/323920. ISSN  0004-6256.
  14. ^ Ball, Robert S. (1884). "Observations in search of stars with annual parallax". Dunsink Observatory Publications. 5: 1–157. Bibcode: 1884DunOP...5....1B.
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