Strange doppler effects on local station

See attached recorded on F5RRS 17m signal... (F5RRS is 35kms away, but behind the mountains)
Anybody has an idea on what could cause such a doppler? plane, meteor trail, or something else (ESS, UFO ? ;-)
Anybody is able to calculate the speed of the object ?
Pat

PS Sorry, have exceeded my 1Mb limit. The file is here
http://mangafight.free.fr/doppler%20f5rrs%2017m.png