MS-T Satellite Bus
Data current as of 2026-07-20.
The MS-T bus accounts for 3 cataloged objects, of which 1 are in orbit and 0 are active. 2 have reentered. Most are built by ISAS. The largest operator on this bus is JAXA. The first launched in 1974, the most recent in 1980.
1
In orbit
0
Active
3
Total launched
2
Reentered
MS-T launched per year
Still in orbit Since reentered Click a year to list its satellites.
Typical specifications
Most common values across cataloged MS-T satellites.
| Manufacturer | ISAS |
|---|---|
| Purpose | Technology |
| Launch mass | 128 kg |
| Dry mass | 128 kg |
| Length | 0.5 m |
| Diameter | 0.8 m |
| Span | 0.9 m |
| Shape | Cyl |
| Power | Batteries |
| Typical orbit | 134 min period, 66° inclination |
Top operators
Top countries
J 3
MS-T satellites
Track any of them live in KeepTrack.
| Name | NORAD | COSPAR | Owner | Launched | Orbit | Status | Track |
|---|---|---|---|---|---|---|---|
| TANSEI-4 (MS-T4) Tansei-4 | 11706 | 1980-015A | ISAS | Feb 17, 1980 | 88 min, 38.7° | Reentered | ◉ |
| TANSEI-3 (MS-T3) Tansei-3 | 09841 | 1977-012A | ISAS | Feb 19, 1977 | 134 min, 65.8° | Inactive | ◉ |
| TANSEI-2 (MS-T2) Tansei-2 | 07122 | 1974-008A | ISAS | Feb 16, 1974 | 88 min, 31.2° | Reentered | ◉ |
Frequently asked questions
How many MS-T satellites are there?
The catalog lists 3 objects built on the MS-T bus. 1 are in orbit and 2 have reentered.
How many MS-T satellites are in orbit?
1 MS-T objects are currently in orbit, of which 0 carry an active status.
Who builds the MS-T bus?
The MS-T bus is most commonly built by ISAS.
When did the first MS-T satellite launch?
The first cataloged MS-T satellite launched in 1974, and the most recent in 1980.