One-line Elements serve the same purpose as Two-Line Elements, to provide information about the orbit of a spacecraft in order to allow a prediction of its position at some time in the near future.
Data for each satellite consists of one line in the following format.
nnnnnYYDDDffffffddddddiiiiiirrrrrreeeeeeppppppaaaaaammmmmmmm
| Description | Format | Units |
|---|---|---|
| NORAD catalogue number | nnnnn | |
| Year | YY | |
| Day number | DDD | |
| Fraction of day | 0.ffffff | days |
| Drag | 0.dddddd | rev/day^2 |
| Inclination | iii.iii | degrees |
| Right Ascension of Ascending Node | rrr.rrr | degrees |
| Eccentricity | 0.eeeeee | |
| Argument of Perigee | ppp.ppp | degrees |
| Mean Anomaly | aaa.aaa | degrees |
| Mean Motion | mm.mmmmmm | rec/day |
One-line elements are available from the Naval Research Laboratory
See also the Two-Line Elements Set Format and the Improved Inter-Range Vector format.
References: amsat.
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