OPS 0855
 | |
| Mission type | Technology |
|---|---|
| Operator | US Air Force |
| COSPAR ID | 1966-099A |
| SATCAT no. | 02524 |
| Mission duration | Planned: 75 days Achieved: 30 days |
| Spacecraft properties | |
| Manufacturer | Martin Marietta |
| Launch mass | 9,680 kilograms (21,340 lb) |
| Start of mission | |
| Launch date | 3 November 1966, 13:50 UTC |
| Rocket | Titan IIIC |
| Launch site | Cape Canaveral LC-40 |
| End of mission | |
| Last contact | 3 December 1966 |
| Decay date | 9 January 1967 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Perigee altitude | 298 kilometers (185 mi) |
| Apogee altitude | 305 kilometers (190 mi) |
| Inclination | 32.82 degrees |
OPS 0855, also designated OV4-3, was an American boilerplate Manned Orbiting Laboratory spacecraft launched in 1966. It was flown to demonstrate the launch configuration for future MOL missions. A number of research payloads, designated Manifold, were carried on board, which were intended to operate for 75 days. However, the spacecraft ceased operations after just 30 days. It was built from a decommissioned HGM-25A Titan I first stage oxidizer tank, bolted to a Transtage. It was part of the MOL and Orbiting Vehicle projects.