Astronomy:HD 56618
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Canis Major[1] |
| Right ascension | 07h 16m 34.99315s[2] |
| Declination | −27° 52′ 52.2453″[2] |
| Apparent magnitude (V) | 4.66[1] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M2III[4] |
| B−V color index | 1.589±0.028[1] |
| Astrometry | |
| Radial velocity (Rv) | +41.5±2.8[1] km/s |
| Proper motion (μ) | RA: −13.479[2] mas/yr Dec.: +38.625[2] mas/yr |
| Parallax (π) | 8.3189 ± 0.2874[2] mas |
| Distance | 390 ± 10 ly (120 ± 4 pc) |
| Absolute magnitude (MV) | −0.80[1] |
| Details | |
| Mass | 1.5[5] M☉ |
| Radius | 61.1+7.3 −6.9[2] R☉ |
| Luminosity | 699.7±27.3[2] L☉ |
| Surface gravity (log g) | 1.35[5] cgs |
| Temperature | 3,797+233 −209[2] K |
| Metallicity [Fe/H] | −0.24[5] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 56618 is a single[7] star in the southern constellation of Canis Major. It is a red-hued star that is faintly visible to the naked eye with an apparent visual magnitude of 4.66.[1] This object is located at a distance of approximately 390 light years from the Sun based on parallax measurements. It is drifting further away with a radial velocity of +41.5 km/s,[1] having come to within 203 light-years some 2.2 million years ago.[1] Olin J. Eggen listed it as a probable member of the Hyades supercluster.[8]
This is an aging red giant star currently on the asymptotic giant branch[3] with a stellar classification of M2III.[4] It is no longer undergoing core hydrogen fusion and has expanded to 61[2] times the radius of the Sun. The star is radiating 700[2] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,797 K.[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. XHIP record for this object at VizieR.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal 104 (1): 275–313, doi:10.1086/116239, Bibcode: 1992AJ....104..275E.
- ↑ 4.0 4.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H.
- ↑ 5.0 5.1 5.2 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024), "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost", Astronomy and Astrophysics 691: A98, doi:10.1051/0004-6361/202451427, Bibcode: 2024A&A...691A..98K.
- ↑ "HD 56618". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+56618.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (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, Bibcode: 2008MNRAS.389..869E.
- ↑ Eggen, O. J. (February 1985), "A systematic search for members of the Hyades supercluster. V. The red giants.", Astronomical Journal 90: 333–340, doi:10.1086/113736, Bibcode: 1985AJ.....90..333E
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