Regarding his binocular obs of this GPS PAM-D, Ron Lee <ronlee@pcisys.net> writes >... >21892 >1 21892U 92009C 98080.88376902 .02011925 -67434-6 80885-3 0 5618 >2 21892 34.4286 7.5870 0932503 256.3201 93.2584 14.2112852414899 >... >Just looking at the elset with a mean motion of 14.2, sure seems odd >that it is due to decay around 21 April. But its perigee is around 150-155 km and it is certainly feeling the drag. It passed through mm=12.0 on December 21, mm=13.0 on February 14 and mm=14.0 on March 16. An evolution to decay on April 21 has it reaching mm=15.0 on April 9 and mm=16 about 28 hours before re-entry. In fact, my prediction of April 21 (as for many of the dates in my latest decay list) assumes that the mean atmosphere density will decrease a little from its recent high value - if current conditions continue, its decay could occur a few days earlier still. I include current elsets for this in both dklist.tle and select.tle, available via my WWW page. Alan -- Alan Pickup | COSPAR site 2707: 55d53m48.7s N 3d11m51.2s W 156m asl Edinburgh | Home: alan@wingar.demon.co.uk +44 (0)131 477 9144 Scotland | SatEvo satellite page: http://www.wingar.demon.co.uk/satevo/