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]
| 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] |
| Distance | 513 ± 4 ly (157 ± 1 pc) |
| Absolute magnitude (MV) | −0.27[6] |
| Details | |
| Mass | 1.32±0.82[7] M☉ |
| Radius | 30.43[8] R☉ |
| Luminosity | 203±3[1] L☉ |
| Surface gravity (log g) | 1.99[9] cgs |
| Temperature | 4,396±122[10] K |
| Metallicity [Fe/H] | +0.01[9] dex |
| Age | 292[1] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
edit- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ "HD 50855". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 11, 2022.
- ^ 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.
- ^ 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.
- ^ Ball, Robert S. (1884). "Observations in search of stars with annual parallax". Dunsink Observatory Publications. 5: 1–157. Bibcode:1884DunOP...5....1B.