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) |

All other columns are blank or fixed.

Example:

NOAA 14 1 23455U 94089A 97320.90946019 .00000140 00000-0 10191-3 0 2621 2 23455 99.0090 272.6745 0008546 223.1686 136.8816 14.11711747148495

For further information, see "Frequently
Asked Questions: Two-Line Element Set Format" in the *Computers &
Satellites* column of *Satellite Times*, Volume 4 Number 3.

TLE Data | Space Data | ||
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Dr. T.S. Kelso
[TS.Kelso@celestrak.com] Follow CelesTrak on Twitter @TSKelso Last updated: 2004 August 30 17:25:47 UTC Accessed 140,793 times since 2000 December 16 Current system time: 2014 April 18 02:58:34 UTC |