Unable to get matching results. about satellite-js HOT 4 CLOSED

Closing this as inactive. @raats31, if you still have some issues please feel free to open them.

from satellite-js.

@raats31, I was able to reproduce your results with satellite.js but, unfortunatelly, I'm out of idea how to get results with AGI STK Desktop application. Is it freeware?

Looking at difference between given results I see that they become close to each other if we suppose that results from STK application are calculated starting since 2017-07-28T02:55:00 but not since 2017-07-28T02:55:06. Is it possible that something was wrong with your input data? Just an assumption.

Have you tried to make similar calculations with original C++ or Python libraries? satellite.js is a port of Python library so corresponding calculations should be as close as possible. I'm not sure which version of the library @shashwatak has ported but today its homepage states that it uses SGP4 version of 2010.

Recent research provided by @tikhonovits with C++ library and further bugfix state that results received by satellite.js match calculations made with original library.

from satellite-js.

Dear @raats31, further to @ezze response, I suspect that since the results you have got from STK seem to be close, but not identical, to the ones you have got with satellite.js, the former ones probably correspond to a different ECI reference frame that should be the J2000.0. Try to extract similar results for TEME with STK and check for matching. I have tried that before and I found that there was a perfect match between them. Also please check FAQ no. 7 here, with respect to the reference frame the results from satellite.js are.

from satellite-js.

Seems that this one is a related issue.

from satellite-js.