Star in the constellation Microscopium
δ Microscopii , Latinised as Delta Microscopii , is a faint, orange hued binary star system in the constellation Microscopium , marking the eyepiece end of the "microscope".[ 8] apparent visual magnitude of +5.68.[ 2] parallax shift of 10.82 mas as seen from the Earth,[ 1] light years from the Sun . At that distance, the visual magnitude is diminished by an extinction factor of 0.142 due to interstellar dust .[ 6]
This is a single-lined spectroscopic binary with an orbital period of 4.4 years and an eccentricity of 0.2.[ 5] evolved K-type giant star with a stellar classification of K0/1 III.[ 3] horizontal branch and thus is generating energy through helium fusion at its core .[ 6] mass of the Sun and has expanded to 11 times the Sun's radius . The star is radiating 57 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,805 K.[ 6]
References
^ a b c d e f 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 . ^ a b c Lake, R. (1965), "Photometric Magnitudes and Colours for Bright Southern Stars (Sixth List)", Monthly Notes of the Astron. Soc. Southern Africa , 24 : 41, Bibcode :1965MNSSA..24...41L . ^ 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 . ^ 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 Bluhm, P.; et al. (2016), "New spectroscopic binary companions of giant stars and updated metallicity distribution for binary systems", Astronomy & Astrophysics , 593 : A133, arXiv :1608.08260 Bibcode :2016A&A...593A.133B , doi :10.1051/0004-6361/201628459 , S2CID 56087624 . ^ a b c d Jones, M. I.; et al. (December 2011), "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets. I. Sample definition and physical properties", Astronomy & Astrophysics , 536 : 7, arXiv :1110.6459 Bibcode :2011A&A...536A..71J , doi :10.1051/0004-6361/201117887 , S2CID 55769003 , A71. ^ "del Mic" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2017-08-12 .{{cite web }}: CS1 maint: postscript (link )^ Ridpath, Ian, "Microscopium" , Star Tales , retrieved 2017-08-14 .
