NORAD Two-Line Element Set Format

Data for each satellite consists of three lines in the following format:

AAAAAAAAAAAAAAAAAAAAAAAA
1 NNNNNU NNNNNAAA NNNNN.NNNNNNNN +.NNNNNNNN +NNNNN-N +NNNNN-N N NNNNN
2 NNNNN NNN.NNNN NNN.NNNN NNNNNNN NNN.NNNN NNN.NNNN NN.NNNNNNNNNNNNNN

Line 0 is a twenty-four character name (to be consistent with the name length in the NORAD SATCAT).

Lines 1 and 2 are the standard Two-Line Orbital Element Set Format identical to that used by NORAD and NASA. The format description is:
Line 1
Column 	Description
01 	Line Number of Element Data
03-07 	Satellite Number
08 	Classification (U=Unclassified)
10-11 	International Designator (Last two digits of launch year)
12-14 	International Designator (Launch number of the year)
15-17 	International Designator (Piece of the launch)
19-20 	Epoch Year (Last two digits of year)
21-32 	Epoch (Day of the year and fractional portion of the day)
34-43 	First Time Derivative of the Mean Motion
45-52 	Second Time Derivative of Mean Motion (decimal point assumed)
54-61 	BSTAR drag term (decimal point assumed)
63 	Ephemeris type
65-68 	Element number
69 	Checksum (Modulo 10)
(Letters, blanks, periods, plus signs = 0; minus signs = 1)
Line 2
Column 	Description
01 	Line Number of Element Data
03-07 	Satellite Number
09-16 	Inclination [Degrees]
18-25 	Right Ascension of the Ascending Node [Degrees]
27-33 	Eccentricity (decimal point assumed)
35-42 	Argument of Perigee [Degrees]
44-51 	Mean Anomaly [Degrees]
53-63 	Mean Motion [Revs per day]
64-68 	Revolution number at epoch [Revs]
69 	Checksum (Modulo 10)
