ATLAS CENTAUR R/B(2)
| Launched | 5 April 1973 |
| Flight ended | – |
| Status | Unknown |
| Launch site | Air Force Eastern Test Range, Florida, USA |
| Owner | United States |
| NORAD ID | 6425 |
| COSPAR ID | 1973-019B |
| Observing |
Timeline
| 1973 Apr 6 | – | Launch from Cape Canaveral SLC-36B |
| 1974 Dec 3 | – | Flyby of Jupiter (closest approach) |
| 1979 Sep 1 | – | Flyby of Saturn (closest approach) |
| 1979 Oct 5 | – | Begin Pioneer Interstellar Mission |
| 1995 Sep 30 | – | Routine contact discontinued |
| 1995 Nov 24 | – | Last telemetry received |