I downloaded the starlink precise ephemeris file from https://www.space-track.org/, the data of each time point includes position, velocity vector and coordinate data. May I ask which coordinate system the vector is in, and what is the meaning of the 21 covariance value
Julien Cocco
Hello, the 21 values in the covariance corresponds to the lower diagonal of the covariance matrix (So you can split it in 6)
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I'm looking for the reference frame of the values now.
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