ORBITAL SCIENCES CORPORATION

Pegasus XL HAPS | MUBLCOM & TERRIERS

SUCCESSMay 18, 1999 at 05:09 UTCPegasus XL HAPS
PADVandenberg Space Force Base
SITEAir launch to orbit →
VEHICLE
Pegasus XL HAPS
LAUNCH PAD
Vandenberg Space Force Base
COUNTRY
USA
CONFIRMEDPrecision: Minute
LAUNCH LIBRARY 2 PRIMARY
API ID: baa4ec28-81b7-484f-8960-d618db808623
Reported date: May 18, 1999 at 05:09 UTC
Last synced: 6 hours ago
This launch date and time are confirmed by the launch provider. Countdown is active.
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MANUFACTURER
Orbital Sciences Corporation
VARIANT
HAPS
FLIGHTS
5
SUCCESSES
5
SUCCESS RATE
100%

The Pegasus is an air-launched rocket developed by Orbital Sciences Corporation (now part of Northrop Grumman Innovation Systems). Capable of carrying small payloads of up to 443 kilograms (977 lb) into low Earth orbit, the vehicle consists of three solid propellant stages and an optional monopropellant fourth stage. Pegasus is released from its carrier aircraft at approximately 40,000 ft (12,000 m), and its first stage has a wing and a tail to provide lift and attitude control while in the atmosphere. The HAPS variant adds a Hydrazine Auxiliary Propulsion System maneuvering stage.

When is the Pegasus XL HAPS | MUBLCOM & TERRIERS launch?
The Pegasus XL HAPS | MUBLCOM & TERRIERS is scheduled for Tuesday, May 18, 1999 at 5:09 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 Pegasus XL HAPS | MUBLCOM & TERRIERS?
The Pegasus XL HAPS | MUBLCOM & TERRIERS mission uses the Pegasus XL HAPS rocket, manufactured by Orbital Sciences Corporation. The Pegasus XL HAPS has flown 5 times with a 100% success rate.
Where is the Pegasus XL HAPS | MUBLCOM & TERRIERS launching from?
The launch takes place from Vandenberg Space Force Base at Air launch to orbit.
Who is launching Pegasus XL HAPS | MUBLCOM & TERRIERS?
The Pegasus XL HAPS | MUBLCOM & TERRIERS is operated by Orbital Sciences Corporation.
Can I watch the Pegasus XL HAPS | MUBLCOM & TERRIERS 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.
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: May 18, 1999 at 05:09 UTC
NET (No Earlier Than) confirmed by Orbital Sciences Corporation
Mar 29, 2026 01:16 UTC
Launch completed successfully
Updated via Launch Library 2
Last data sync: 6 hours ago
Launch Library 26 hours ago
Launch ID: baa4ec28-81b7-484f-8960-d618db808623
Open-Meteo Weather6 hours ago
Pad weather at 34.73, -120.57

Mission Profile

Pegasus XL HAPS | MUBLCOM & TERRIERS was a Pegasus XL HAPS mission operated by Orbital Sciences Corporation that lifted off from Vandenberg Space Force Base, Air launch to orbit on May 18, 1999. The launch was a success.