Astronomy:Delta Reticuli
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Reticulum |
| Right ascension | 03h 58m 44.74945s[1] |
| Declination | −61° 24′ 00.6673″[1] |
| Apparent magnitude (V) | 4.60[2] |
| Characteristics | |
| Evolutionary stage | asymptotic giant branch[3] |
| Spectral type | M2 III[4] |
| U−B color index | +2.02[2] |
| B−V color index | +1.61[2] |
| Variable type | Suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | −1.4±2.8[6] km/s |
| Proper motion (μ) | RA: +9.80[1] mas/yr Dec.: −14.30[1] mas/yr |
| Parallax (π) | 6.20 ± 0.25[1] mas |
| Distance | 530 ± 20 ly (161 ± 7 pc) |
| Absolute magnitude (MV) | −1.47[7] |
| Details | |
| Radius | 56[8] R☉ |
| Luminosity | 1,100[9] L☉ |
| Temperature | 3,891[9] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta Reticuli (Delta Ret, δ Reticuli, δ Ret) is a star in the southern constellation of Reticulum. It is visible to the naked eye, having an apparent visual magnitude of 4.60.[2] The distance to this star, as estimated from its annual parallax shift of 6.20 mas,[1] is roughly 530 light-years from the Sun.
This is an evolved red giant star on the asymptotic giant branch,[3] having a stellar classification of M2 III.[4] It has expanded to around 56[8] times the radius of the Sun and radiates 1,100 times the solar luminosity from its cool outer atmosphere at an effective temperature of 3,891 K.[9]
Delta Reticuli is moving through the Milky Way at a speed of 13.3 km/s relative to the Sun. Its projected galactic orbit carries it between 22,700 and 30,400 light-years from the center of the galaxy.[11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Feinstein, A. (1966), "Photoelectric observations of Southern late-type stars", The Information Bulletin for the Southern Hemisphere 8: 30, Bibcode: 1966IBSH....8...30F.
- ↑ 3.0 3.1 Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal 104: 275, doi:10.1086/116239, Bibcode: 1992AJ....104..275E.
- ↑ 4.0 4.1 Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ↑ Samus, N. N.Expression error: Unrecognized word "etal". (2004), "Combined General Catalogue of Variable Stars (GCVS4.2)", VizieR On-line Data Catalog (Institute of Astronomy of Russian Academy of Sciences and Sternberg State Astronomical Institute of the Moscow State University), Bibcode: 2004yCat.2250....0S.
- ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 8.0 8.1 Pasinetti Fracassini, L. E. et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics 367: 521–24, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 9.0 9.1 9.2 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ "del Ret". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=del+Ret.
- ↑ "Delta Reticuli (HIP 18597)". http://www.astrostudio.org/xhip.php?hip=18597.
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