Incorrect prediction for Iridm 15 Dlt r

Gregory May (tandemcaptain@worldnet.att.net)
Wed, 18 Mar 1998 12:54:29 -0500

On Monday evening I observed this VERY fast-moving object.

Actually, I was lucky to have caught sight of it, because it was
approximately 50 seconds EARLY, according to the prediction generated by
SatSpy v2.5 (3/16/98  19:49:56).

If I am correct, my elset is only a few days old.

Can someone help me understand what has caused the error in the prediction?

Iridm 15 Dlt r  
1 24874U 97034F   98071.68636191  .00452083  00000-0  77857-3 0  2614
2 24874  82.7069 294.2950 0091361 155.6367 204.9969 15.94758062 38325


Thanks,

Gregory May
Rubbermaid MIS
tandemcaptain@worldnet.att.net