NORAD Two-Line Element Set Format
As I mentioned in my previous publication, NORAD Two-Line Element Set Format is a standard operating procedure to transmit satellites orbital parameters.
For example:
123456789012345678901234567890123456789012345678901234567890123456789
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
To facilitate the compression, I have added column number in the first row. As a result we can detect we have 69 characters.
Lines (0, 1 and 2) description:
– Line 0: satellite name
– Line 1 description:
|
Line 1 |
||
|
Columns |
Description |
Example |
|
01 |
Row number |
1 |
|
03-07 |
Satellite number |
23455 |
|
08 |
Classification (U=Unclassified) |
U |
|
09 |
None |
|
|
10-11 |
International Designator (Last two digits of launch year) |
94 |
|
12-14 |
International Designator (Launch number of the year) |
089 |
|
15-17 |
International Designator (Piece of the launch) |
A00 |
|
18 |
None |
|
|
19-20 |
Epoch Year (Last two digits of year) |
97 |
|
21-32 |
Epoch (Day of the year and fractional portion of the day) |
97320.90946019 |
|
34-43 |
First Time Derivative of the Mean Motion |
.00000140 |
|
45-52 |
Second Time Derivative of Mean Motion (decimal point assumed) |
00000-0 |
|
53 |
None |
|
|
54-61 |
BSTAR drag term (decimal point assumed) |
10191-3 |
|
62 |
None |
|
|
63 |
Ephemeris type |
0 |
|
64 |
None |
|
|
65-68 |
Element number |
262 |
|
69 |
Checksum (Modulo 10) |
1 |
– Line 2 description:
|
Line 2 |
||
|
Columnas |
Description |
Example |
|
01 |
Line Number of Element Data |
2 |
|
03-07 |
Satellite Number |
23455 |
|
08 |
None |
|
|
09-16 |
Inclination [Degrees] |
99.0090 |
|
17 |
None |
|
|
18-25 |
Right Ascension of the Ascending Node [Degrees] |
275.6745 |
|
26 |
None |
|
|
27-33 |
Eccentricity (decimal point assumed) |
0008546 |
|
34 |
None |
|
|
35-42 |
Argument of Perigee [Degrees] |
223.1686 |
|
43 |
None |
|
|
44-51 |
Mean Anomaly [Degrees] |
136.8816 |
|
52 |
None |
|
|
53-63 |
Mean Motion [Revs per day] |
14.11711747 |
|
64-68 |
Revolution number at epoch [Revs] |
14849 |
|
69 |
Checksum |
5 |