Sfera (TEKh-44) is a small passive satellite deployed during a spacewalk from the ISS in August 2012.
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Description
Also called the Vektor-T calibration sphere, the Sfera satellite is used to determine the density of the upper atmosphere by measuring how much drag occurs when the satellite passes through it.
TEKh-44 is a shiny sphere 53 cm (20.8 inches) across weighing 14 kg (~31 pounds).
Re-entry
It re-entered the atmosphere in late November 2012.
References
Sfera (satellite) Wikipedia(Text) CC BY-SA