MMS Satellite Bus
Data current as of 2026-07-20.
The MMS bus accounts for 6 cataloged objects, of which 2 are in orbit and 0 are active. 4 have reentered. Most are built by FAIR. The largest operator on this bus is NASA. The first launched in 1980, the most recent in 1992.
2
In orbit
0
Active
6
Total launched
4
Reentered
MMS launched per year
Still in orbit Since reentered Click a year to list its satellites.
Typical specifications
Most common values across cataloged MMS satellites.
| Manufacturer | FAIR |
|---|---|
| Purpose | Earth observation |
| Launch mass | 1938 kg |
| Dry mass | 1863 kg |
| Length | 4 m |
| Diameter | 2.1 m |
| Span | 10 m |
| Shape | Box + 2 Pan |
| Power | Deployable solar array, batteries |
| Propulsion | ? |
| Design life | 3 years design; 28.8 years reached (#5) |
| Equipment | TM, MSS |
| Typical orbit | 96 min period, 66° inclination |
Top operators
Top countries
US 6
MMS satellites
Track any of them live in KeepTrack.
| Name | NORAD | COSPAR | Owner | Launched | Orbit | Status | Track |
|---|---|---|---|---|---|---|---|
| TOPEX/POSEIDON Topex-Poseidon | 22076 | 1992-052A | JPL/CNES | Aug 10, 1992 | 112 min, 66.0° | Inactive | ◉ |
| EUVE EUVE | 21987 | 1992-031A | GSFC | Jun 7, 1992 | 87 min, 28.4° | Reentered | ◉ |
| UARS UARS | 21701 | 1991-063B | GSFC | Sep 12, 1991 | 87 min, 56.9° | Reentered | ◉ |
| LANDSAT 5 Landsat 5 | 14780 | 1984-021A | NOAA | Mar 1, 1984 | 96 min, 98.1° | Inactive | ◉ |
| LANDSAT 4 Landsat 4 | 13367 | 1982-072A | GSFC | Jul 16, 1982 | 88 min, 98.2° | Reentered | ◉ |
| SMM Solar Maximum Mission | 11703 | 1980-014A | GSFC | Feb 14, 1980 | 87 min, 28.5° | Reentered | ◉ |
Frequently asked questions
How many MMS satellites are there?
The catalog lists 6 objects built on the MMS bus. 2 are in orbit and 4 have reentered.
How many MMS satellites are in orbit?
2 MMS objects are currently in orbit, of which 0 carry an active status.
Who builds the MMS bus?
The MMS bus is most commonly built by FAIR.
When did the first MMS satellite launch?
The first cataloged MMS satellite launched in 1980, and the most recent in 1992.