It is not an uncertainty. A large satellite can break up and different pieces can re-enter at different times. I experienced this working the orbital decay of the Apollo 9 Lunar Module back in 1981.

FYI Apollo 9 did a lunar landing rehearsal in Earth orbit.

73 Ken N2WWD

Sent from my iPad

On Sep 24, 2011, at 4:11 AM, Paolo Mattiolo [email protected] wrote:

That's incredible that NASA still is not sure with precision where the sat fall down!!

73 de in3aqk

On Sat, Sep 24, 2011 at 9:27 AM, Clint Bradford [email protected]wrote:

...

We can now confirm that #UARS is down! Debris fell to Earth between 11:23 p.m. EDT Friday, Sept. 23, and 1:09 a.m. EDT Sept. 24. -NASA

Clint Bradford [email protected]

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-- Paolo Mattiolo Software developer

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ham call sign: IN3AQK IQRP N° 715 _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb