PyEphem

Relative velocity

Asked by Miguel de Val Borro

I would like to calculate the relative velocity of an object along the line of sight with respect to the observer. It looks like this is not mentioned in the documentation. Is it possible to calculate the relative velocity using the Observer class?

Miguel

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Launchpad Janitor (janitor) said : 		#1

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

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Brandon Rhodes (brandon-rhodes) said : 		#2

Simply check the .earth_distance or, for earth satellites, their .range attribute for a pair of times an hour or day apart. Subtract to find the difference in range, divide by one day (or hour or whatever), and you should get the rate at which the range is changing.

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