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1987-08-01
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From santra!tut!enea!mcvax!seismo!husc6!ut-sally!ut-ngp!tskelso Mon Jul 27 14:35:18 EET DST 1987
Article 34 of rec.ham-radio:
Path: santra!tut!enea!mcvax!seismo!husc6!ut-sally!ut-ngp!tskelso
>From: tskelso@ut-ngp.UUCP (TS Kelso)
Newsgroups: rec.ham-radio
Subject: NASA Prediction Bulletin Format
Keywords: Satellite, Orbital Elements, Keplerian
Message-ID: <5685@ut-ngp.UUCP>
Date: 24 Jul 87 02:31:23 GMT
Organization: UTexas Computation Center, Austin, Texas
Lines: 65
As a service to the amateur satellite community, the following description
of the NASA Prediction Bulletin's two-line orbital element set format is
uploaded to rec.ham-radio on a monthly basis.
==============================================================================
Data for each satellite consists of three lines in the following format:
AAAAAAAAAAA
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 1 is a eleven-character name.
Lines 2 and 3 are the standard Two-Line Orbital Element Set Format identical
to that used by NASA and NORAD. The format description is:
Line 2
Column Description
01-01 Line Number of Element Data
03-07 Satellite Number
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 launch)
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 of ephemeris type)
45-52 Second Time Derivative of Mean Motion (Blank if N/A)
54-61 BSTAR drag term if GP4 general perturbation theory was used.
Otherwise, radiation pressure coefficient.
63-63 Ephemeris type
65-68 Element number
69-69 Check Sum (Modulo 10)
(Letters, blanks, periods = 0; minus sign = 1)
Line 3
Column Description
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 [Revs per day]
64-68 Revolution number at epoch [Revs]
69-69 Check Sum (Modulo 10)
All other columns are blank or fixed.
Example:
NOAA 6
1 11416U 86 50.28438588 0.00000140 67960-4 0 5293
2 11416 98.5105 69.3305 0012788 63.2828 296.9658 14.24899292346978
Note that the International Designator fields are usually blank, as issued in
the NASA Prediction Bulletins.
--
TS Kelso ARPA: tskelso@ngp.utexas.edu
The Center for Space Research
The University of Texas at Austin UUCP: {ihnp4,seismo,sally}!ngp!tskelso