Name Tsuru (BIRDS-4)
Type CubeSat
Units or mass 1U
Status Reentry 2022-07-05. Was operational, but 2 of 3 had solar panel failures and negative power budget (Signals reported on Twitter and SatNOGS as of 2021-03-27)
Launched 2021-02-20
NORAD ID 47927
Deployer J-SSOD (JEM Small Satellite Orbital Deployer)
Launcher Antares (NG-15)
Deployment Deployed from ISS on 2021-03-14
Organisation Kyushu Institute of Technology
Institution University
Entity Academic / Education
Nation Japan
Manufacturer AIVT by Kyushu Institute of Technology
Launch brokerer JAXA

Educational and amateur radio mission.


The primary mission of BIRDS-4 CubeSat constellation is to provide digital message relay service to the amateur radio community by means of an APRS (Automatic Packet Reporting System) digipeater onboard.

  1. APRS digipeater
  2. Store-and-Forward
  3. Total Ionization Dosage
  4. Hentenna mission
  5. Active attitude control
  6. Perovskite solar cell
  7. Camera mission
  8. On-board Image classification
Failure cause Two BIRDS-4 had one solar panel failure and negative power budget. Need to confirm which ones.
Sources [1] [2] [3] [4]
Photo sources [1] [2] [3] [4]
Space photos TsuruTsuruTsuruTsuru


Last modified: 2023-06-09
Detailed Tsuru entry in the Database
Full Nanosats Database (much more data)

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