Delta Reticuli

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Delta Reticuli
Diagram showing star positions and boundaries of the Reticulum constellation and its surroundings
Cercle rouge 100%.svg

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
Spectral type M2 III[3]
U−B color index +2.02[2]
B−V color index +1.61[2]
Variable type Suspected[4]
Astrometry
Radial velocity (Rv) −1.4±2.8[5] 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[6]
Details
Radius 56[7] R
Luminosity 1,100[8] L
Temperature 3,891[8] K
Other designations
δ Ret, CPD−61 290, FK5 1110, HD 25422, HIP 18597, HR 1247, SAO 248918.[9]
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 a evolved red giant star on the asymptotic giant branch,[10] having a stellar classification of M2 III.[3] It has expanded to around 56[7] 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.[8]

Delta Reticuli is moving through the Galaxy 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[edit]

  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Feinstein, A. (1966), "Photoelectric observations of Southern late-type stars", The Information Bulletin for the Southern Hemisphere, 8: 30, Bibcode:1966IBSH....8...30F. 
  3. ^ a b 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. 
  4. ^ Samus, N. N.; Durlevich, O. V.; et al. (2004), Combined General Catalogue of Variable Stars (GCVS4.2), Institute of Astronomy of Russian Academy of Sciences and Sternberg State Astronomical Institute of the Moscow State University, Bibcode:2004yCat.2250....0S. 
  5. ^ 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, Bibcode:2012A&A...546A..61D, arXiv:1208.3048Freely accessible, doi:10.1051/0004-6361/201219219, A61. 
  6. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971Freely accessible, doi:10.1134/S1063773712050015. 
  7. ^ a b Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics (3rd ed.), 367: 521–24, Bibcode:2001A&A...367..521P, arXiv:astro-ph/0012289Freely accessible, doi:10.1051/0004-6361:20000451. 
  8. ^ a b c McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037Freely accessible, doi:10.1111/j.1365-2966.2012.21873.x. 
  9. ^ "del Ret -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-02-14. 
  10. ^ Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal, 104: 275, Bibcode:1992AJ....104..275E, doi:10.1086/116239. 
  11. ^ Delta Reticuli (HIP 18597)