One more suggestion: Run a prediction from the last good elset for a time near its epoch. A prediction from the new elset should also be close to that "obs", when drag terms are reasonable. If you can't find observations over a long arc, you can also use that "obs" as input (unless you suspect a maneouvre was made in the interval). > ... > One final tip: always compare the residuals of your new orbit relative the > observations from which it was derived. In the present example, I found large > time residuals, of the order of 10 seconds - another indication of a problem. > > I am glad to see that you are interested in this aspect of the hobby, and I hope > that you will keep at it. > ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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