Vanguard SLV-3 (Vanguard 2D), an NRL ~10 kg IGY satellite with infrared photocells to scan Earth's cloud cover from Cape Canaveral LC-18A, failed when second-stage underthrust left it short of orbital velocity; it reentered after one incomplete pass.
- Outcome
- Failure
- Orbit
- MEO
- Medium Earth orbit
- Payload to orbit
- Did not reach orbit
- Flight
- 7th
- of 11 Vanguard flights
- Date and time
- 26 September 1958, 15:38 UTC
- Rocket
- Vanguard
- Builder
- LM
- Launch site
- Launch Complex 18A, Cape Canaveral SFS, FL, USA
- Payload
- Earth Science
- Launches in 1958
- 21st of 28