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  • #758

Closed
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Opened Feb 20, 2021 by Mark Rutten@markrutten

Support alpha-5 TLE satellite numbers

US Space Force have introduced a new form of 5-digit satellite number (a combination of a letter and numbers) that allows for numbers > 99,999. Orekit currently expects the satellite numbers to be decimal digits.

From the space-track documentation:

Alpha-5 is a stopgap object numbering schema from the United States Space Force that increases the satellite catalog’s capacity to display up to 339,999 objects in the GP/GP_History API classes using legacy fixed-width Two and Three Line Element Set (TLE/3LE) formats.

Replacing the 1st digit of the 5-digit object number with an alphanumeric character makes it possible to represent 240,000 more numbers. Objects less than 100,000 are unaffected by Alpha-5, as are users who download elsets from the GP and GP_History API classes in other formats like XML, JSON, KVN, and CSV. In order to preserve legacy operations that depend on 5-digit integers, our legacy API Classes tle, tle_latest, and tle_publish will not change to Alpha-5.

Only capital letters and numbers are used in Alpha-5. The letters “I” and “O” are omitted to avoid confusion with the numbers “1” and “0”.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information
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Reference: orekit/orekit#758