N-I (rocket)
- 2 min read
- 2 chapters
Explore on Lably
ToursExplore Lably’s 3D toursOn 29 February 1976, the second N-I conducted the only orbital launch, as of 17 February 2024, to occur on a leap day.
Launch history
Sign in to keep reading
One more chapter is free with a Lably account.
Payload Descriptions
Engineering Test Satellite I "KIKU-1" (ETS-1)
ETS-1 was the first satellite launched by the NASDA. It had the objective of acquiring information on N-series launch vehicles, orbit injection, and tracking and control. It ceased operations on 28 April 1982.
Ionosphere Sounding Satellite "UME" (ISS)
UME was Japan's first Ionosphere Sounding Satellite. It was used to monitor radio waves in the ionosphere and forecast conditions for shortwave communications. A power supply issue caused Ume to stop functioning one month after launch.
Engineering Test Satellite II "KIKU-2" (ETS-2)
KIKU-2 was NASDA's first satellite launched to GEO. It was intended to gather data on geostationary satellite launch, tracking, control, orbit maintenance, and attitude control as well as carrying out experiments on communications equipment. KIKU-2 ceased operations on 10 December 1990, leaving GEO.
Ionosphere Sounding Satellite "UME-2" (ISS-b)
UME-2 had similar goals to the original UME satellite, but was much more successful in carrying them out. While it was originally intended to gather data for only a year and a half, UME-2 ceased operations on 23 February 1983.
Experimental Communications Satellites "Ayame/Ayame-2" (ECS/ECS-b)
Both ECS satellites were unsuccessful in completing their mission. During the first ECS launch, the third stage rocket collided with the satellite shortly after separation. During the ECS-2 launch, the satellite stopped transmitting shortly after separation. The satellites had the intention of conducting millimeter wave experiments. The JAXA website states that "we learned some valuable lessons on satellite separation technology and apogee engine from this experience".
About Engineering Test Satellite III "KIKU-4" (ETS-III)
KIKU-4 was developed to acquire data on designing earth observation satellites with high power requirements. KIKU-4 completed testing of three-axis attitude control, deployable solar panels, movable heat control, and ion engine operation. On 8 April 1985, the satellite ran out of fuel and ceased operation.