Muon Satellite Bus
Data current as of 2026-07-20.
The Muon bus accounts for 4 cataloged objects, of which 3 are in orbit and 3 are active. 1 have reentered. Most are built by MUON. The largest operator on this bus is MUON. The first launched in 2023, the most recent in 2025.
3
In orbit
3
Active
4
Total launched
1
Reentered
Muon launched per year
Still in orbit Since reentered Click a year to list its satellites.
Typical specifications
Most common values across cataloged Muon satellites.
| Manufacturer | MUON |
|---|---|
| Purpose | Technology |
| Launch mass | 130 kg |
| Dry mass | 130 kg |
| Length | 0.5 m |
| Diameter | 0.3 m |
| Span | 0.5 m |
| Shape | Box |
| Power | Solar cells, batteries |
| Propulsion | None |
| Typical orbit | 96 min period, 98° inclination |
Top operators
MUON 3 HYDRO 1
Top countries
US 4
Muon satellites
Track any of them live in KeepTrack.
| Name | NORAD | COSPAR | Owner | Launched | Orbit | Status | Track |
|---|---|---|---|---|---|---|---|
| MUSAT3 | 64573 | 2025-135AX | HYDRO | Jun 23, 2025 | 96 min, 97.7° | Active | ◉ |
| FIRESAT0 | 63256 | 2025-052AY | MUON | Mar 15, 2025 | 96 min, 97.7° | Active | ◉ |
| MUSAT2 MuSat-2 | 59099 | 2024-043B | MUON | Mar 4, 2024 | 95 min, 97.9° | Active | ◉ |
| MUSAT1 MuSat-1 | 56967 | 2023-084AM | MUON | Jun 12, 2023 | 88 min, 97.5° | Reentered | ◉ |
Frequently asked questions
How many Muon satellites are there?
The catalog lists 4 objects built on the Muon bus. 3 are in orbit and 1 have reentered.
How many Muon satellites are in orbit?
3 Muon objects are currently in orbit, of which 3 carry an active status.
Who builds the Muon bus?
The Muon bus is most commonly built by MUON.
When did the first Muon satellite launch?
The first cataloged Muon satellite launched in 2023, and the most recent in 2025.