SEA LAUNCH
Zenit | DemoSat
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Mar 28, 1999 at 01:29 UTC
▸ Flight profile›
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MISSION OVERVIEW
DemoSat was the dummy payload on the first Boeing Sea Launch mission. The Zenit-3SL booster rocket lifted off from the Odyssey floating platform on the equator at 154 degrees W longitude.
LAUNCH DETAILS
VEHICLE
Zenit
AGENCY
Sea LaunchMISSION
DemoSat
MISSION TYPE
Test Flight
TARGET ORBIT
Elliptical Orbit
LAUNCH PAD
Launch Platform Odyssey
LAUNCH SITE
Sea LaunchCOUNTRY
RUS
LAUNCH TIME VERIFICATION
CONFIRMEDPrecision: Minute
LAUNCH LIBRARY 2 PRIMARY
API ID: eae0a45d-fd6c-49e4-9816-dd7d3975712e
Reported date: Mar 28, 1999 at 01:29 UTC
Last synced: 30 seconds ago
This launch date and time are confirmed by the launch provider. Countdown is active.
LAUNCH MAP
PAD WEATHER
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VEHICLE
MANUFACTURER
Sea Launch
VARIANT
3SL
FLIGHTS
36
SUCCESSES
33
SUCCESS RATE
91.7%
FREQUENTLY ASKED QUESTIONS
When is the Zenit | DemoSat launch?
The Zenit | DemoSat is scheduled for Sunday, March 28, 1999 at 1:29 AM UTC. This is the NET (No Earlier Than) time and may be subject to change. Current status: SUCCESS.
What rocket is being used for DemoSat?
The Zenit | DemoSat mission uses the Zenit rocket, manufactured by Sea Launch. The Zenit has flown 36 times with a 91.7% success rate.
Where is the Zenit | DemoSat launching from?
The launch takes place from Launch Platform Odyssey at Sea Launch.
What orbit is DemoSat going to?
The DemoSat mission is targeting Elliptical Orbit.
Who is launching DemoSat?
The Zenit | DemoSat is operated by Sea Launch.
Can I watch the Zenit | DemoSat launch live?
Yes. Visit the launch detail page on Space Launch Live for embedded YouTube webcasts, replay videos, and links to live coverage from SpaceX, NASA, NASASpaceflight, and other channels.
LAUNCH TIMELINE
Mar 29, 2026 01:16 UTC
Launch added to tracker
Imported from Launch Library 2 API
Mar 29, 2026 01:16 UTC
Launch date set: Mar 28, 1999 at 01:29 UTC
NET (No Earlier Than) confirmed by Sea Launch
Mar 29, 2026 01:16 UTC
Launch completed successfully
Updated via Launch Library 2
LIVE DATA SOURCES
Last data sync: 30 seconds ago
●Launch Library 230 seconds ago
Launch ID: eae0a45d-fd6c-49e4-9816-dd7d3975712e
●Open-Meteo Weather22 hours ago
Pad weather at 0, -154
Mission Profile
DemoSat was a Zenit 3SL mission operated by Sea Launch that lifted off from Launch Platform Odyssey, Sea Launch on March 28, 1999. The flight carried its payload on a test flight mission to Elliptical Orbit. The launch was a success.