SAN MARCO 3
| Launched | 23 April 1971 |
| Flight ended | 28 November 1971 |
| Status | Decayed |
| Launch site | San Marco Launch Platform, Indian Ocean (Kenya) |
| Owner | Italy |
| NORAD ID | 5176 |
| COSPAR ID | 1971-036A |
| Observing |
SAN MARCO 3
| Launched | 23 April 1971 |
| Flight ended | 28 November 1971 |
| Status | Decayed |
| Launch site | San Marco Launch Platform, Indian Ocean (Kenya) |
| Owner | Italy |
| NORAD ID | 5176 |
| COSPAR ID | 1971-036A |
| Observing |