Abstract
We begin with a description of the genesis of the Libertad 1 satellite, a type 1U CubeSat purchased and then fitted by the Sergio Arboleda University. This satellite was the first object to orbit the Earth by initiative of a colombian institution. We made an analysis of the orbital elements determined by NORAD and then we calculate decay rates of the semimajor axis due to atmospheric drag within an interval of five years. With these values we calculated average atmospheric density at 720 km altitude.
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