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SS 433
SS 433 is one of the most exotic star systems observed. It is an eclipsing X-ray binary system, with the primary most likely a black hole, or possibly a neutron star.〔, pp. 23–24. The spectrum of the secondary companion star suggests that it is a late A-type star.〔(Identification of the Mass Donor Star's Spectrum in SS 433 ), T. C. Hillwig, D. R. Gies, W. Huang, M. V. McSwain, M. A. Stark, A. van der Meer, and L. Kaper, ''Astrophysical Journal'' 615, #1 (November 2004), pp. 422–431.〕 SS 433 is a microquasar, the first discovered.〔 SS 433's designation comes from the initials of two astronomers at Case Western Reserve University: Nicholas Sanduleak and C. Bruce Stephenson. It was the 433rd entry in their 1977 catalog of stars with strong emission lines.〔(SS 433 ), David Darling, entry in ''The Internet Encyclopedia of Science'', accessed on line September 14, 2007.〕 ==Location==
SS 433, also known as V1343 Aquilae, located at 5.5 kpc in the galactic plane (''l= 39.7° and b= -2.2°'')
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