# Re: 1 line keps

• Subject: Re: [amsat-bb] 1 line keps
• From: "Chris Hill" <crh_telnet@xxxxxxxxxxx>
• Date: Fri, 28 Jan 2000 13:48:13 +0800

```Hi Bob,

The following is from http://www.amsat.org/amsat/keps/formats.html#charlie

The One Line Element (OLE) format is a somewhat abbreviated set of data used
by the Navy at the Naval Research Laboratory (and perhaps others). Some
useful information which is included in the 2-Line Element format is
omitted, such as the Revolution Number at Epoch. Other information, such as
the International Designator, can often be obtained from other sources using
the satellite number (NORAD catalog number). The only virtue to this format
is its brevity.

1         2         3         4         5         6
123456789012345678901234567890123456789012345678901234567890

Column Definitions
Columns, Description, Format, Units
1 - 5, NORAD catalog number, NNNNN
6 - 7, Year, NN, years
8 - 10, Day number, NNN, days
11 - 16, Fraction of a day, 0.NNNNNN, days
17 - 22, Drag, 0.NNNNNN, rev/day^2
23 - 28, Inclination, NNN.NNN, degrees
29 - 34, R.A.A.N., NNN.NNN, degrees
35 - 40, Eccentricity, 0.NNNNNN, dimensionless
41 - 46, Argument of Perigee, NNN.NNN, degrees
47 - 52, Mean Anomaly, NNN.NNN, degrees
53 - 60, Mean Motion, NN.NNNNNN, rev/day

Example
206399019071772000014705251829684400765901146334880715202450
The following values are obtained:

20639 catalog number
90 year
190 day number
0.717720 fraction of a day
0.000147 drag term
52.518 inclination
296.844 ascending node
0.007659 eccentricity
011.463 argument of perigee
348.807 mean anomaly
15.202450 mean motion

The input of elements in this form may be terminated by a line which
contains a zero for the catalog number.

[One-Line Element format information courtesy Mike McCants.]

Regards,

Chris vk6kch

----- Original Message -----
To: <amsat-bb@AMSAT.Org>
Sent: Friday, January 28, 2000 11:12 AM
Subject: [amsat-bb] 1 line keps

> Does anyone have a copy of, or reference to the NASA one-line elements?
>
> Bob
>
>
> ----
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