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bwinkel / cysgp4

A wrapper around the SGP4 package, for sat TLE calculations
Apache License 2.0
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error in create_constellations #14

Closed fdivruno closed 4 years ago

fdivruno commented 4 years ago

In Starlink example the create_constellation function gives an error when generating large number of satellites. I tried to generate 30000 satellites from the latest Starlink filing and is says:

ValueError Traceback (most recent call last) ValueError: TLE line string must have 69 characters Exception ignored in: 'cysgp4.utils.tle_checksum' ValueError: TLE line string must have 69 characters

If I change the sat_nr from 80000 to 1, the error dissapears. As we discussed this is related to the maximum number of digits that the TLE admits for satellite number.

bwinkel commented 4 years ago

Thanks, @fdivruno!

Indeed, TLEs must have at most a 5-digit ID. I'll change the create_constellation function in the notebook and add some value-checks to the tle_linestrings_from_orbital_parameters routine for better user feedback.