Sixth US/Russian Space Surveillance Workshop: August 22-26, 2005, Proceedings

accuracy activity allows altitude analysis application approach atmospheric atmospheric density average b₁ b₂ ballistic calculated catalogue changes coefficient combination compared computed considered correlation COWPOKE cycle daily debris density corrections detection determination developed difference distribution drag Earth effects elements equations errors estimates explosion extreme user field Figure files filters forecasting fragments function future given GOST increase indices initial integration interval limited longitude man-made maximum mean measurements method motion nonlinear objects observations obtained operations optical orbit parameters performance period perturbations plots polar position possible prediction presented probability problem range reference region relative represent respect Russia satellite sensor shown shows solar Space Surveillance spacecraft spheres standard statistical sunspot Table task telescope track utility values variations vector weights