Launched NASA's Mars Polar Lander and the piggybacked Deep Space 2 penetrator probes toward Mars to study the south polar terrain and soil; the mission ended in failure when the lander lost contact during its December 1999 descent.
- Outcome
- Success
- Orbit
- Helio-N/A
- Heliocentric orbit
- Payload to orbit
- 583 kg
- Flight
- 2nd
- of 3 Delta II 7425-9.5 flights
- Date and time
- 3 January 1999, 20:21 UTC
- Rocket
- Delta II 7425-9.5
- Builder
- McDonnell Douglas
- Launch site
- Space Launch Complex 17B, Cape Canaveral SFS, FL, USA
- Payload
- Robotic Exploration
- International designator
- 1999-001
- Launches in 1999
- 1st of 78
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