SS 433

<a href="/facts/Celestial_coordinate_system/23HhqvHj">Coordinates</a>:  <a href="http://www.wikisky.org/?ra=19.1971&de=4.9826666666667&zoom=5&show_grid=1&show_constellation_lines=1&show_constellation_boundaries=1&show_const_names=1&show_galaxies=1&img_source=IMG_all">19h 11m 49.56s, +04° 58′ 57.6″</a>

<p>SS 433 is a <a href="/facts/Microquasar/qINUAeEy">microquasar</a> or <a href="/facts/Eclipsing_binary/TYlDe1bD">eclipsing</a> <a href="/facts/X-ray_binary/fpvJvImP">X-ray binary</a> <a href="/facts/Stellar_system/1vX99BMV">system</a>, consisting of a stellar-mass <a href="/facts/Black_hole/1r2lmkcF">black hole</a> <a href="/facts/Accretion_(astrophysics)/atcWRsDP">accreting</a> matter from an <a href="/facts/A-type_star/dYrIuK9H">A-type</a> <a href="/facts/Companion_star/TYlDe1bD">companion star</a>. SS 433 is the first discovered microquasar. It is at the centre of the supernova remnant <a href="/facts/W50_(nebula)/olIhUWHh">W50</a>.
</p><p>SS 433's designation comes from the initials of two astronomers at <a href="/facts/Case_Western_Reserve_University/S0xlUbTM">Case Western Reserve University</a>: <a href="/facts/Nicholas_Sanduleak/CCqayLoW">Nicholas Sanduleak</a> and <a href="/facts/Charles_Bruce_Stephenson/R2IpWvI5">Charles Bruce Stephenson</a>. It was the 433rd entry in their 1977 catalog of stars with strong emission lines. Its emission lines were studied by <a href="/facts/Mordehai_Milgrom/cyqvKDY1">Mordehai Milgrom</a> in 1979. 
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SS 433 open-in-new

SS 433