Vanguard SLV-6

Rocket launch

by USA

Launch time22 Jun 195920:16 UTC


The second stage helium control bottle valve failed to open properly at engine start. Tank and chamber pressures rapidly decayed during second stage burn, and 40 seconds after engine start, the helium bottle ruptured due to pressure buildup. The third stage then separated and ignited, driving itself and the satellite into the Atlantic Ocean 300 miles downrange.

Rocket Vanguard

launched from Cape Canaveral, LC-18AUSA


Inflatable spherescientific experiment--
Vanguard 3Bscientific satellite10.3 kg-