Double flares: NOAA 11, Iridium 36

Ed Cannon (
Sat, 17 Jul 1999 03:55:38 -0500

NOAA 11 (12531, 88-89A) did a very bright double flare 
just a few seconds after the culmination of its pass, as 
it passed a couple of degrees east of Vega.  The first 
was about -1 mag., and the second was about +0.  Each 
flare lasted five or six seconds, and they were separated 
by maybe ten seconds.  Some days ago on a similar pass 
NOAA 11 did a very bright flare in the same part of the 
sky.  That one could have been a double also; I didn't 
see the beginning.

There was a prediction for a +0 flare of Iridium 36 
(25289, 98-21E) at 3:26:50 UTC, just six seconds before 
the culmination predicted by Quicksat.  But it flared 
some seconds before that time at about the same 
brightness as well, dimmed and then flared again at the 
predicted time.

Location was BCRC: 30.314N, 97.866W, 280 m.

Ed Cannon - - Austin, Texas, USA