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What is the format for the two-line element sets?

April 26, 2017element format two-line

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What is the format for the two-line element sets?

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A NORAD two-line element set consists of two 69-character lines of data which can be used together with NORAD’s SGP4/SDP4 orbital model to determine the position and velocity of the associated satellite. The only valid characters in a two-line element set are the numbers 0-9, the capital letters A-Z, the period, the space, and the plus and minus signs—no other characters are valid.