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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