Osumi was the first Japanese satellite. It comprised the fourth stage of an Lambda 4S launcher and transmitted in orbit for about 17 hours.
| launch date |
Feb 11, 1970 |
| launch vehicle |
Lambda 4S |
| launch site |
Kagoshima |
| orbit |
340 × 5,140 km × 31° |
| mass (at launch) |
24 kg |
