Another excellent discussion of the TLE format and orbital parameters may be found at: orbitessera. Note that although these are called two line elements, the inclusion of a line with the object name makes each entry take up 3 lines in the file.
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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.
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, 2000+ if < 57. |
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, 2000+ if < 57 |
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) |