rvObsToRaDecRate

ssapy.compute.rvObsToRaDecRate(r, v, obsPos=None, obsVel=None)

Convert object and observer position and velocity to angles.

This only does the geometric part; it ignores light travel time, which may be applied to the object location before input. Assumes that r, v, obsPos, and obsVel all have common shape.

Parameters:

• r (array_like (..., 3)) – object position in meters

• v (array_like (..., 3)) – object velocity in meters per second

• obsPos (array_like (..., 3)) – observer position in meters

• obsVel (array_like (..., 3), optional) – observer velocity in meters per second

Returns:

• ra (array_like (…)) – right ascension in radians

• dec (array_link (…)) – declination in radians

• slantRange (array_like (…)) – Range in meters

• raRate (array_like (…)) – Rate of change of right ascension*cos(dec) in radians per second.

• decRate (array_like (…)) – Rate of change of declination in radians per second.

• slantRangeRate (array_like (…)) – Slant range rate in meters per second.