Hi all , There's another elset , mean deviation is 5.2 arc sec , this is probab= ly the limit of my analysis prg, I hope better! The RAAN is true equinox of date . 97000 97339.4662965 000 66.3850 251.2497 8611370 335.9122 000.3615 00.41478447 = Strictly speaking the epoch is not the exact equator crossing time, = I used Mike's value for convenience. = = = Dan =