HD 46568 (HR 2399) is a solitary[13] star in the southern constellation Columba. It is faintly visible to the naked eye with an apparent magnitude of 5.25.[2] Parallax measurements place the object at a distance of 284 light years[1] and is currently receding with a heliocentric radial velocity of 39 km/s.[6]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 06h 32m 21.3775s[1] |
| Declination | −37° 41′ 48.2053″[1] |
| Apparent magnitude (V) | 5.25±0.01[2] |
| Characteristics | |
| Spectral type | G8 III[3] |
| U−B color index | +0.75[4] |
| B−V color index | +0.98[5] |
| Astrometry | |
| Radial velocity (Rv) | 39±1[6] km/s |
| Proper motion (μ) | RA: +73.075 mas/yr[1] Dec.: −75.599 mas/yr[1] |
| Parallax (π) | 11.4692 ± 0.0782 mas[1] |
| Distance | 284 ± 2 ly (87.2 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.64[7] |
| Details[8] | |
| Mass | 1.94±0.11 M☉ |
| Radius | 10.66±0.18 R☉ |
| Luminosity | 60.7±1.4 L☉ |
| Surface gravity (log g) | 2.69±0.07 cgs |
| Temperature | 4,935±29 K |
| Metallicity [Fe/H] | −0.16±0.02 dex |
| Rotational velocity (v sin i) | 1.2±1.2[9] km/s |
| Age | 1.68[10] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 46568 has a stellar classification of G8 III, indicating that it is a yellow giant. At present it has nearly twice the mass of the Sun[8] but at an age of 1.68 billion years[10] it has expanded to 10.66 times the radius of the Sun.[8] It has an effective temperature of 4,935 K,[8] giving it a yellow glow. However, the star's large radius yields a luminosity 60 times that of Sun.[8] HD 46568's metallicity is 69% that of the Sun[8] and it spins with a poorly constrained projected rotational velocity of 1.2 km/s.[9]
References
edit- ^ a b c d e 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.
- ^ a b 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.
- ^ 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.
- ^ Paunzen, E. (May 2022). "Catalogue of stars measured in the Geneva seven-colour photometric system". Astronomy & Astrophysics. 661: A89. arXiv:2111.04810. Bibcode:2022A&A...661A..89P. doi:10.1051/0004-6361/202142355. eISSN 1432-0746. ISSN 0004-6361.
- ^ Stoy, R. H. (1968). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 27: 119. Bibcode:1968MNSSA..27..119S. ISSN 0024-8266.
- ^ a b 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.
- ^ 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.
- ^ a b c d e f Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy & Astrophysics. 657: A87. arXiv:2201.01528. Bibcode:2022A&A...657A..87O. doi:10.1051/0004-6361/202040078. ISSN 0004-6361.
- ^ a b 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.
- ^ a b Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; de Laverny, P.; Recio-Blanco, A.; Lovis, C. (February 2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample". Astronomy & Astrophysics. 646: A77. arXiv:2012.10199. Bibcode:2021A&A...646A..77G. doi:10.1051/0004-6361/202039765. eISSN 1432-0746. ISSN 0004-6361.
- ^ "HD 46568". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 June 2022.
- ^ 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.
- ^ 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.