HD 46815

HD 46815 (HR 2411) is a solitary[14] star in the southern constellation Columba. It is faintly visible to the naked eye with an apparent magnitude of 5.4 and is estimated to be 408 light years away.[1] However, it is receding with a heliocentric radial velocity of 32.2 km/s.[5]

HD 46815
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 06h 33m 49.4800s[1]
Declination −36° 13′ 55.2951″[1]
Apparent magnitude (V) 5.40±0.01[2]
Characteristics
Spectral type K3 III[3]
U−B color index +1.72[4]
B−V color index +1.42[4]
Astrometry
Radial velocity (Rv)32.2±2.8[5] km/s
Proper motion (μ) RA: −15.622 mas/yr[1]
Dec.: +99.481 mas/yr[1]
Parallax (π)7.9846 ± 0.0528 mas[1]
Distance408 ± 3 ly
(125.2 ± 0.8 pc)
Absolute magnitude (MV)+0.03[6]
Details
Mass1.17[7] M☉
Radius24.15[8] R☉
Luminosity180±2[9] L☉
Surface gravity (log g)1.68[7] cgs
Temperature4,297±122[8] K
Metallicity [Fe/H]+0.08[10] dex
Rotational velocity (v sin i)2.3±1.2[11] km/s
Other designations
106 G. Columba, CD−36°2990, CPD−36°994, GC 8559, HD 46815, HIP 31299, HR 2411, SAO 196945[12][13]
Database references
SIMBADdata

HD 46815 has a stellar classification of K3 III,[3] indicating that it is a red giant. At present it has 117% the mass of the Sun[7] but has expanded to 24.15 times its girth.[8] It shines with a luminosity of 180 L☉[9] from its enlarged photosphere at an effective temperature of 4,297 K,[8] giving an orange hue. HD 46815 has a metallicity 120% that of the Sun and is believed to be a member of the old disk.[10] Due to it being a giant star, it has a low projected rotational velocity of 2.3 km/s.[11]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. Bibcode:1982mcts.book.....H.
  4. Mermilliod, J. -C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
  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. ISSN 1063-7737. S2CID 255204555.
  7. Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
  8. 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. ISSN 0004-6256.
  9. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  10. Eggen, Olin J. (April 1989). "Large and kinematically unbiased samples of G- and K-type stars. IV - Evolved stars of the old disk population". Publications of the Astronomical Society of the Pacific. 101: 366. Bibcode:1989PASP..101..366E. doi:10.1086/132442. eISSN 1538-3873. ISSN 0004-6280.
  11. De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
  12. "HR 2411". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 15, 2022.
  13. Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  14. 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.
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