Lacrosse 5 disappeared instead of flared at 21:51 UTC

From: Marco Langbroek (
Date: Mon Jul 31 2006 - 18:10:23 EDT

> Also if the YVV/33 degree theory is correct Marco has a chance to observe flares in the next few days
> Flare Results for Observer Lat=52.15412 Long=4.49081
> Satellite NORAD 28646
> Flare Results for Flight Mode YVV Panel Angle 33
> 12. SAR MA 2.97104043228698 at 31/07/2006 21:51:22 Alt=74.2391395227923 

Phil a.o.,

It did not flare, but disappeared again instead....

I picked Lacrosse 5 (05-016A) up at about 21:50:00 UTC near Bootes/CrB. It was 
mag. +2.5 brightening to +2.0 in the next half minute or so.

Somewhere around 21:50:45 I started to look at my clock to trigger the camera 
countdown at 21:51:07 UTC. When I looked up again at 21:51:09 or so, it already 
was gone. It did not re-appear.

The photograph (21:51:18.1 to 21:51:28.8 UTC) shows no trail at all, meaning 
that at that time it must have been fainter than +3.5. Would it have been as 
bright as it was a 21:50:00 to 21:50:45 it would be visible on the image, and 
certainly if it subsequently would have flared.

There was some thin cirrus in the sky, but the area where it should have flared 
was clear and faint stars are visible on the image.

- Marco

Dr Marco Langbroek  -  SatTrackCam Leiden, Cospar 4353
Leiden, the Netherlands. 52.15412 N,  4.49081 E (WGS84), +0 m ASL

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