NOAA KLM User's GuideAppendix A.6 |
A description of the NASA prediction bulletin's two line, orbital element set format is explained in the following example.
Data for each satellite consists of three lines (two of which contain actual orbital elements) in the following format:
AAAAAAAAAAAAAAAAAAAAAA
1 NNNNNU NNNNNAAA NNNNN.NNNNNNNN +.NNNNNNNN +NNNNN-N +NNNNN-N
NNNNNN
2 NNNNN NNN.NNNN NNN.NNNN NNNNNNN NNN.NNNN NNN.NNNN
NN.NNNNNNNNNNNNNN
Line 0 is a twenty-two-character name. Lines 1 and 2 are the standard Two Line Orbital Element Set Format identical to that used by USSC (formerly NORAD) and NASA. The format is described in Table A.6-1.
| Column | Description |
|---|---|
| Line 1 | |
| 01-01 | Line Number of Element Data |
| 03-07 | Satellite Number |
| 10-11 | International Designator (Last two digits of launch year). See Table A.6-2. |
| 12-14 | International Designator (Launch number of the year). See Table A.6-2. |
| 15-17 | International Designator (Piece of launch). See Table A.6- 2. |
| 19-20 | Epoch Year (Last two digits of year) |
| 21-32 | Epoch (Julian Day and fractional portion of the day) |
| 34-43 | First Time Derivative of the Mean Motion or Ballistic Coefficient (depending on ephemeris type) |
| 45-52 | Second Time Derivative of Mean Motion (decimal point assumed; blank if N/A) |
| 54-61 | BSTAR drag term if GP4 general perturbation theory was used. Otherwise, radiation pressure coefficient. (Decimal point assumed) |
| 63-63 | Ephemeris type |
| 65-68 | Element Number |
| 69-69 | Check Sum (Modulo 10) |
| Line 2 | |
| 01-01 | 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 (revolutions per day) |
| 64-68 | Revolution number at epoch (revolutions) |
| 69-69 | Check Sum (Modulo 10) |
| Note: All other columns are blank or fixed. | |
| Satellite name | Satellite ID (USSC) | International Designator (Launch year and day) |
|---|---|---|
| NOAA-1 | 04793 | 7Δ1Δ6 |
| NOAA-2 | 06235 | 72Δ82 |
| NOAA-3 | 06920 | 73Δ86 |
| NOAA-4 | 07529 | 74Δ89 |
| NOAA-5 | 09057 | 76Δ77 |
| TIROS-N | 11060 | 78096 |
| NOAA-6 | 11416 | 79057 |
| NOAA-7 | 12553 | 81059 |
| NOAA-8 | 13923 | 83022 |
| NOAA-9 | 15427 | 84123 |
| NOAA-10 | 16969 | 86073 |
| NOAA-11 | 19531 | 88089 |
| NOAA-12 | 21263 | 91032 |
| NOAA-13 | 22739 | 93050 |
| NOAA-14 | 23455 | 94089 |
| NOAA-15 | 25337 | 98133 |
| NOAA-16 | 26536 | 00055 |
| NOAA-17 | 27453 | 02032 |
| NOAA-18 | 28654 | 05018 |
| NOAA-19 | 33591 | 09005 |
| MetOp-A | 29499 | 06044 |
| Δ indicates a blank | ||
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