ORS Satellite Bus
Data current as of 2026-07-20.
The ORS bus accounts for 13 cataloged objects, of which 8 are in orbit and 0 are active. 5 have reentered. Most are built by TRW. The largest operator on this bus is AFSSD. The first launched in 1966, the most recent in 1971.
8
In orbit
0
Active
13
Total launched
5
Reentered
ORS launched per year
Still in orbit Since reentered Click a year to list its satellites.
Typical specifications
Most common values across cataloged ORS satellites.
| Manufacturer | TRW |
|---|---|
| Purpose | Experimental |
| Launch mass | 9 kg |
| Dry mass | 9 kg |
| Length | 0.3 m |
| Diameter | 0.3 m |
| Span | 0.3 m |
| Shape | Oct Cyl |
| Power | Solar cells |
| Propulsion | None |
| Equipment | various: see above |
| Typical orbit | 2831 min period, 33° inclination |
Top operators
Top countries
US 13
ORS satellites
Track any of them live in KeepTrack.
| Name | NORAD | COSPAR | Owner | Launched | Orbit | Status | Track |
|---|---|---|---|---|---|---|---|
| TETR 4 TETR 3 | 05492 | 1971-083B | GSFC | Sep 29, 1971 | 88 min, 33.1° | Reentered | ◉ |
| OV5-9 OV5-9 | 03952 | 1969-046C | SAMSO | May 23, 1969 | 3115 min, 32.9° | Inactive | ◉ |
| ERS 26 (OV5-6) ERS 26 | 03951 | 1969-046B | SAMSO | May 23, 1969 | 3115 min, 32.9° | Inactive | ◉ |
| ERS 29 (OV5-5) ERS 29 | 03950 | 1969-046A | SAMSO | May 23, 1969 | 3120 min, 34.0° | Inactive | ◉ |
| TETR 2 TETR 2 | 03534 | 1968-100B | GSFC | Nov 8, 1968 | 88 min, 32.8° | Reentered | ◉ |
| ERS 21 (OV5-4) ERS 21 | 03430 | 1968-081C | SAMSO | Sep 26, 1968 | 1436 min, 13.6° | Inactive | ◉ |
| ERS 28 (OV5-2) ERS 28 | 03429 | 1968-081B | SAMSO | Sep 26, 1968 | 346 min, 26.1° | Reentered | ◉ |
| TATS 1 (TETR-1) TTS 1 | 03067 | 1967-123B | GSFC | Dec 13, 1967 | 88 min, 32.9° | Reentered | ◉ |
| ERS 27 (OV5-1) ERS 27 | 02769 | 1967-040E | AFSSD | Apr 28, 1967 | 2827 min, 37.5° | Inactive | ◉ |
| ERS 20 (OV5-3) ERS 20 | 02768 | 1967-040D | AFSSD | Apr 28, 1967 | 2831 min, 35.1° | Inactive | ◉ |
| ERS 18 ERS 18 | 02767 | 1967-040C | AFSSD | Apr 28, 1967 | 2831 min, 35.2° | Inactive | ◉ |
| ERS 15 ORS 1 | 02412 | 1966-077C | AFSSD | Aug 19, 1966 | 168 min, 90.3° | Inactive | ◉ |
| ERS 16 ORS 2 | 02202 | 1966-051C | AFSSD | Jun 9, 1966 | 90 min, 89.9° | Reentered | ◉ |
Frequently asked questions
How many ORS satellites are there?
The catalog lists 13 objects built on the ORS bus. 8 are in orbit and 5 have reentered.
How many ORS satellites are in orbit?
8 ORS objects are currently in orbit, of which 0 carry an active status.
Who builds the ORS bus?
The ORS bus is most commonly built by TRW.
When did the first ORS satellite launch?
The first cataloged ORS satellite launched in 1966, and the most recent in 1971.