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code-lab-org / tatc

Tradespace Analysis Toolkit for Constellations (version 3) Library
BSD 3-Clause "New" or "Revised" License
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TLE gives NaN propagation result #29

Closed JaimeBardaji closed 1 year ago

JaimeBardaji commented 1 year ago

CICERO 8 satellite

"1 43737U 18096U 23104.23131873 .00314780 00000+0 18505-2 0 9999", "2 43737 97.3248 199.0316 0005801 347.9317 12.1809 15.77351267244832"

Inspection with sgp4 indicates error 2, which is "mean motion has fallen bellow 0". TAT-C should detect and handle this condition.

ptgrogan commented 1 year ago

This is an interesting case. The pasted TLE contains some non-breaking spaces (generally display as identical to regular spaces but are a different character which apparently throws a code 2 error in SGP4). This issue should be caught in the TLE validation check.

ptgrogan commented 1 year ago

FYI this issue has been raised with the underlying library and will generate a more informative error in future versions.