Questions tagged [horizons]

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Calculation of Osculating Elements from State Vectors in Horizons

I figured out that the osculating semi-major axis of the planet orbits in Horizons is calculated from the observed/computed state vectors by assuming the kinetic energy as given by the observed ...
3
votes
1answer
56 views

Inconsistency between Horizons Cartesian Vector and Elements Ephemerides

I am puzzled why the 'Argument of Perifocus' in the 'Elements' ephemeris of JPL Horizons data seems to change at almost twice the rate compared to that derived from the 'Cartesian Vector' data (by ...
3
votes
0answers
103 views

Looking for help in drawing diagrams to explain graphically NASA Horizons output

I searched a lot for a javascript library or a REST API to access full functionalities of powerful NASA Horizons tool, but with no luck, so I am trying to write my own interface, to replace the very ...