I know Dr. Kelso's website says NORAD updates its elsets only when the current sets differs from the prediction by 5 km with a 90% confidence interval. Does anyone know of any data on how often specific constellations are updated and the accuracy of NORAD's models (i.e., do they also use special perturbation models for higher fidelity)? Also, I am trying to quantify the accuracy of SGP4 models... Is it largely dependent on the atmospheric density model used, or are there also errors from the propagation? Thank you in advance for your help, Kati MIT Lincoln Laboratory email: kline@ll.mit.edu phone: 781.981.1763 ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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