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The question What kinds of things have been tossed out of the ISS? has a broken YouTube link. This is why it's good to include at least the name of the video in your post (which I didn't back in 2016). I got it from the Science20 post Why A Ball Thrown To Earth From Orbit "Boomerangs". Can Astronauts Hit Earth With A Ball, Arrow Or Bullet? where the link is also broken. The (missing) video is introduced as:

Here is a steel ball thrown out of the ISS to help test how well ground stations can track orbital debris

Any ideas what steel ball this could be, or how I might go about tracking another video of the event down?

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The ODERACS (Orb Debris Rad Calib Sph):

Five-centimeter balls were detected by the Don-2N radar with an experimental processing program with incoherent accumulation of about a dozen signals at a target height of 352 km and at a distance of 500-800 km (tracking up to 900-1500 km).

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