ARISSat-1 also known as Radioskaf-b or Kedr has been given a catalog number of 37772 and called Radioskaf-b in the Keplerian list.
Graham Shirville, G3VZV notes that ARISSat-1 leads the ISS by 20 seconds and is less than 1 km below it.
Information from: http://www.arissat1.org/v3/
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