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Old October 8th 10, 01:36 PM posted to sci.astro.satellites.visual-observe
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Default Centaur D AC-28 flashing

Centaur D AC-28 72003-B #5816

When I spotted this object on Thursday morning it had some
variation in brightness. This morning it was definitely tumbling.
I estimate it flashed once every two seconds. Otherwise it was
almost invisible in my 10x50 binoculars.

--Bill Thompson