Delta Reticuli

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.

Delta Reticuli
Diagram showing star positions and boundaries of the Reticulum constellation and its surroundings
Location of δ Reticuli (circled)
Observation data
Epoch J2000.0      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 mas[1]
Distance530 ± 20 ly
(161 ± 7 pc)
Absolute magnitude (MV)−1.47[7]
Details
Radius56[8] R☉
Luminosity1,100[9] L☉
Temperature3,891[9] K
Other designations
δ Ret, CPD−61 290, FK5 1110, HD 25422, HIP 18597, HR 1247, SAO 248918.[10]
Database references
SIMBADdata

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. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. Feinstein, A. (1966), "Photoelectric observations of Southern late-type stars", The Information Bulletin for the Southern Hemisphere, 8: 30, Bibcode:1966IBSH....8...30F.
  3. Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal, 104: 275, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  4. Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  5. Samus, N. N.; Durlevich, O. V.; et al. (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.
  6. 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  7. 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.
  8. Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics (3rd ed.), 367: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  9. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  10. "del Ret". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-02-14.{{cite web}}: CS1 maint: postscript (link)
  11. "Delta Reticuli (HIP 18597)". Archived from the original on 2014-04-14. Retrieved 2012-08-17.
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