What is it? Unidentified tumbling object crossing the Sun
Posted: Wed Feb 03, 2010 1:31 pm
APOD and General Astronomy Discussion Forum
https://asterisk.apod.com/
The 30m Shuttle Orbiter at 340 km. subtends about 0.3 arc minutes or about 1% the diameter of the Sun.
My first guess would be a mylar birthday balloon blowing around not far from the telescope. A tumbling satellite is possible, but it looks a bit large; I figure it would be between 10 and 20 meters across if in low Earth orbit.