DMSP Block 5A Satellite Bus
Data current as of 2026-07-20.
The DMSP Block 5A bus accounts for 3 cataloged objects, of which 3 are in orbit and 0 are active. Most are built by RCA. The largest operator on this bus is SAMSO. The first launched in 1970, the most recent in 1971.
3
In orbit
0
Active
3
Total launched
0
Reentered
DMSP Block 5A launched per year
Still in orbit Click a year to list its satellites.
Typical specifications
Most common values across cataloged DMSP Block 5A satellites.
| Manufacturer | RCA |
|---|---|
| Purpose | Meteorology |
| Launch mass | 104 kg |
| Dry mass | 104 kg |
| Length | 1.2 m |
| Diameter | 0.8 m |
| Span | 1.2 m |
| Shape | Taper Cyl |
| Power | Solar cells, batteries |
| Propulsion | ? |
| Equipment | ? |
| Typical orbit | 100 min period, 99° inclination |
Top operators
SAMSO 3
Top countries
US 3
DMSP Block 5A satellites
Track any of them live in KeepTrack.
| Name | NORAD | COSPAR | Owner | Launched | Orbit | Status | Track |
|---|---|---|---|---|---|---|---|
| OPS 5268 (DMSP 5A F3) DAPP 3526 | 04953 | 1971-012A | SAMSO | Feb 17, 1971 | 100 min, 98.5° | Inactive | ◉ |
| OPS 0203 (DMSP 5A F2) DAPP 2525 | 04512 | 1970-070A | SAMSO | Sep 3, 1970 | 100 min, 98.9° | Inactive | ◉ |
| OPS 0054 (DMSP 5A F1) DAPP 1524 | 04331 | 1970-012A | SAMSO | Feb 11, 1970 | 100 min, 99.0° | Inactive | ◉ |
Frequently asked questions
How many DMSP Block 5A satellites are there?
The catalog lists 3 objects built on the DMSP Block 5A bus. 3 are in orbit and 0 have reentered.
How many DMSP Block 5A satellites are in orbit?
3 DMSP Block 5A objects are currently in orbit, of which 0 carry an active status.
Who builds the DMSP Block 5A bus?
The DMSP Block 5A bus is most commonly built by RCA.
When did the first DMSP Block 5A satellite launch?
The first cataloged DMSP Block 5A satellite launched in 1970, and the most recent in 1971.