DSP Satellite Bus
Data current as of 2026-07-20.
The DSP bus accounts for 4 cataloged objects, of which 4 are in orbit and 0 are active. Most are built by TRW. The largest operator on this bus is SAMSO. The first launched in 1970, the most recent in 1973.
4
In orbit
0
Active
4
Total launched
0
Reentered
DSP launched per year
Still in orbit Click a year to list its satellites.
Typical specifications
Most common values across cataloged DSP satellites.
| Manufacturer | TRW |
|---|---|
| Purpose | Early Warning |
| Launch mass | 903 kg |
| Dry mass | 860 kg |
| Length | 6.9 m |
| Diameter | 2.8 m |
| Span | 7.4 m |
| Shape | Cyl + 4 Pan |
| Power | 4 deployable fixed solar arrays, solar cells, batteries |
| Propulsion | MRE-4 |
| Design life | 1.25 years |
| Equipment | ? |
| Typical orbit | 1443 min period, 0° inclination |
Top operators
SAMSO 4
Top countries
US 4
DSP satellites
Track any of them live in KeepTrack.
| Name | NORAD | COSPAR | Owner | Launched | Orbit | Status | Track |
|---|---|---|---|---|---|---|---|
| OPS 6157 (DSP 4) DSP F4 | 06691 | 1973-040A | SAMSO | Jun 12, 1973 | 1443 min, 0.9° | Inactive | ◉ |
| OPS 1570 (DSP 3) DSP F3 | 05851 | 1972-010A | SAMSO | Mar 1, 1972 | 1443 min, 0.5° | Inactive | ◉ |
| OPS 3811 (DSP 2) DSP F2 | 05204 | 1971-039A | SAMSO | May 5, 1971 | 1467 min, 0.4° | Inactive | ◉ |
| OPS 5960 (DSP 1) DSP F1 | 04630 | 1970-093A | SAMSO | Nov 6, 1970 | 1198 min, 15.2° | Inactive | ◉ |
Frequently asked questions
How many DSP satellites are there?
The catalog lists 4 objects built on the DSP bus. 4 are in orbit and 0 have reentered.
How many DSP satellites are in orbit?
4 DSP objects are currently in orbit, of which 0 carry an active status.
Who builds the DSP bus?
The DSP bus is most commonly built by TRW.
When did the first DSP satellite launch?
The first cataloged DSP satellite launched in 1970, and the most recent in 1973.