Vanguard SLV-5, carrying a 13-inch magnetometer satellite (Vanguard 3A) and an inflatable air-density sub-satellite for Earth magnetic-field and upper-atmosphere studies. Second-stage attitude control was lost after first-stage separation; the stack tumbled into the Atlantic after about 500 seconds.
- Outcome
- Failure
- Orbit
- LEO
- Low Earth orbit
- Payload to orbit
- Did not reach orbit
- Flight
- 9th
- of 11 Vanguard flights