PADSpace Launch Complex 41
SITECape Canaveral SFS, FL, USA →ORBITLow Earth Orbit
TYPEGovernment/Top Secret
MISSION OVERVIEW
It is the second flight of the second Boeing X-37B vehicle and the fourth flight of the program. United States Air Force Orbital Test Vehicle is an unmanned 5000 kg, 8.8 m-long reusable mini-spaceplane capable of autonomous re-entry and landing. The OTV-4 mission was to test Aerojet Rocketdyne’s XR-5A Hall-effect thruster and conduct a NASA investigation for testing various materials in space. The mission concluded after 717 days in orbit, marking the first time X-37B landed on the Shuttle Landing Facility at the Kennedy Space Center.
LAUNCH DETAILS
VEHICLE
Atlas V 501AGENCY
United Launch AllianceMISSION
OTV-4 (X-37B) (USA 261) ( AFSPC-5) & ULTRASat cubesat deployer
MISSION TYPE
Government/Top Secret
TARGET ORBIT
Low Earth Orbit
LAUNCH PAD
Space Launch Complex 41LAUNCH SITE
Cape Canaveral SFS, FL, USACOUNTRY
USA
LAUNCH TIME VERIFICATION
CONFIRMEDPrecision: Minute
LAUNCH LIBRARY 2 PRIMARY
API ID: d7e9249d-1e33-4fac-bec8-ac94c365f6e2
Reported date: May 20, 2015 at 15:05 UTC
Last synced: 1 hour ago
This launch date and time are confirmed by the launch provider. Countdown is active.
LAUNCH MAP
PAD WEATHER
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X-37B — X-37B 2
2SERIAL
4FLIGHTS
Low Earth OrbitDESTINATION
ActiveSTATUS
FLIGHT-PROVEN CAPSULE
Second X-37B. First flight on March 5, 2011.
VEHICLE — Atlas V 501 →
MANUFACTURER
United Launch Alliance
VARIANT
501
FLIGHTS
8
SUCCESSES
8
SUCCESS RATE
100%
Atlas V with 5m Fairing, 0 SRB, 1 Centaur upper stage engine.
FREQUENTLY ASKED QUESTIONS
When is the Atlas V 501 | OTV-4 (X-37B) (USA 261) (AFSPC-5) & ULTRASat cubesat deployer launch?
The Atlas V 501 | OTV-4 (X-37B) (USA 261) (AFSPC-5) & ULTRASat cubesat deployer is scheduled for Wednesday, May 20, 2015 at 3:05 PM UTC. This is the NET (No Earlier Than) time and may be subject to change. Current status: SUCCESS.
What rocket is being used for OTV-4 (X-37B) (USA 261) ( AFSPC-5) & ULTRASat cubesat deployer?
The Atlas V 501 | OTV-4 (X-37B) (USA 261) (AFSPC-5) & ULTRASat cubesat deployer mission uses the Atlas V 501 rocket, manufactured by United Launch Alliance. The Atlas V 501 has flown 8 times with a 100% success rate.
Where is the Atlas V 501 | OTV-4 (X-37B) (USA 261) (AFSPC-5) & ULTRASat cubesat deployer launching from?
The launch takes place from Space Launch Complex 41 at Cape Canaveral SFS, FL, USA.
What orbit is OTV-4 (X-37B) (USA 261) ( AFSPC-5) & ULTRASat cubesat deployer going to?
The OTV-4 (X-37B) (USA 261) ( AFSPC-5) & ULTRASat cubesat deployer mission is targeting Low Earth Orbit.
Who is launching OTV-4 (X-37B) (USA 261) ( AFSPC-5) & ULTRASat cubesat deployer?
The Atlas V 501 | OTV-4 (X-37B) (USA 261) (AFSPC-5) & ULTRASat cubesat deployer is operated by United Launch Alliance.
Can I watch the Atlas V 501 | OTV-4 (X-37B) (USA 261) (AFSPC-5) & ULTRASat cubesat deployer 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 00:03 UTC
Launch added to tracker
Imported from Launch Library 2 API
Mar 29, 2026 00:03 UTC
Launch date set: May 20, 2015 at 15:05 UTC
NET (No Earlier Than) confirmed by United Launch Alliance
Mar 29, 2026 00:03 UTC
Launch completed successfully
Updated via Launch Library 2
LIVE DATA SOURCES
Last data sync: 1 hour ago
●Launch Library 21 hour ago
Launch ID: d7e9249d-1e33-4fac-bec8-ac94c365f6e2
●Open-Meteo Weather1 hour ago
Pad weather at 28.58, -80.58
●YouTube Video Search2 days ago
1 video discovered
