ETS-4 (Kiku-3), NASDA's Engineering Test Satellite flown on the maiden N-II (N-2) launch from Tanegashima into a high elliptical transfer orbit to verify N-II performance and on-orbit spacecraft systems; ceased operations in December 1984.
- Outcome
- Success
- Orbit
- LEO
- Low Earth orbit
- Payload to orbit
- 650 kg
- Flight
- 1st
- of 8 N-2 flights
- Date and time
- 11 February 1981, 08:30 UTC
- Rocket
- N-2
- Builder
- MHI
- Launch site
- Osaki Launch Complex, Tanegashima Space Center, Japan
- Payload
- Test Flight
- International designator
- 1981-012
- Launches in 1981
- 13th of 126
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