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osculating element
subjectfact 
osculating elementsee also orbital elementhas source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:33:34.0
has definition One of several parameters that specifies the instantaneous position and velocity of a celestial body in its perturbed orbit. Osculating elements describe the unperturbed (two-body) orbit that the body would follow if perturbations were to cease instantaneously.has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:33:34.0
is a kind of orbital quantity2001-09-27 09:33:34.0
quantityhas unit2001-09-27 09:33:12.0
numberhas value2001-09-27 09:32:57.0