Astrophysics (index)

Kepler Radius

(radius at which a particular velocity would orbit)

Kepler Radius is a term I can find no definition for. I'm guessing it can be used for disks for which Orbital Speeds of the material have been determined through the analysis of the width of Spectral Lines and apparent Doppler Shifts and the term represents the radius of a normal orbit which would yield the determined velocities. I.e., disk material's velocity can be affected by forces other than Gravity, such as gas pressure and radiant pressure, and the Kepler Radius would represent the radius expected if these other forces were negligible.