The original “D” satellite

• Object D, 1958 - 2 launches, 1 success (Sputnik-3)

  • 8A91 uprated rocket
  • Feb 1958 launch originally would have been first satellite
  • Preempted by PS-1/2 and Explorer 1
  • Blew up
  • Backup satellite launched May 1958 as Sputnik 3
  • Studied Van Allen belts