HD 56618
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Canis Major |
| Right ascension | 07h 16m 34.99315s[1] |
| Declination | −27° 52′ 52.2453″[1] |
| Apparent magnitude (V) | 4.66[2] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M2III[4] |
| B−V color index | 1.589±0.028[2] |
| Astrometry | |
| Radial velocity (Rv) | +41.5±2.8[2] km/s |
| Proper motion (μ) | RA: −13.479[1] mas/yr Dec.: +38.625[1] mas/yr |
| Parallax (π) | 8.3189 ± 0.2874 mas[1] |
| Distance | 390 ± 10 ly (120 ± 4 pc) |
| Absolute magnitude (MV) | −0.80[2] |
| Details | |
| Radius | 61.1+7.3 −6.9[1] R☉ |
| Luminosity | 699.7±27.3[1] L☉ |
| Temperature | 3,797+233 −209[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 56618 is a single[6] 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.[2] 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,[2] having come to within 203 light-years some 2.2 million years ago.[2] Olin J. Eggen listed it as a probable member of the Hyades supercluster.[7]
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[1] times the radius of the Sun. The star is radiating 700[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,797 K.[1]
References
[edit]- ^ a b c d e f g h i j k 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.
- ^ a b c d e f g Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
- ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
- ^ "HD 56618". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-17.
- ^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Eggen, O. J. (February 1985), "A systematic search for members of the Hyades supercluster. V. The red giants.", Astronomical Journal, 90: 333–340, Bibcode:1985AJ.....90..333E, doi:10.1086/113736
