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RUNOFF = (dT * e + 10 / P * dP) * ko / P * 3600 * 3
where dT is the uncertainty in the perihelion time (in days)
e is the eccentricity
P is the orbital period (in years)
dP is the uncertainty in the orbital period (in days)
ko is the Gaussian constant in degrees
= 180 / pi * 0.01720209895
3600 converts to seconds of arc
3 is a empirical factor to make the formal errors more
closely model reality
and RUNOFF is the in-orbit longitude runoff in seconds of
arc per decade