NORAD Two-Line Element Set Format

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)
(Letters, blanks, periods, plus signs = 0; minus signs = 1)

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

 

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