The following also may be of interest to you: http://www.satobs.org/seesat/Feb-2004/0100.html http://www.alumni.caltech.edu/~tfly/images/8-Feb-04-SolarTransit.jpg The MCC ephemeris evidently is the product of numerical integration of enhanced gravitational and atmospheric models, and there's at least the claim that: http://spaceflight.nasa.gov/realdata/sightings/SSapplications/Post/JavaSSOP/SSOP_Help/Vector.html "You also have access to a Mission Control Center, or MCC, ephemeris during space shuttle missions and for the International Space Station. An ephemeris is simply a collection of state vectors in chronological order generated in the MCC. The state vectors that are generated in the MCC are far and above the most accurate available, and their use is highly recommended." Within the past week, I've added ISS "planetary encounters" to my ISS Transit reports, so I expect that soon there'll be more information regarding the accuracy of ISS TLEs, at least. ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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