UNITED STATES AIR FORCE
Thor Delta E1 | Isis 2
—
—
Apr 1, 1971 at 02:57 UTC
▸ Flight profile›
Initializing Launch Globe…
MISSION OVERVIEW
ISIS 2 was an ionospheric observatory instrumented with a sweep- and a fixed-frequency ionosonde, a VLF receiver, energetic and soft particle detectors, an ion mass spectrometer, an electrostatic probe, a retarding potential analyzer, a beacon transmitter, a cosmic noise experiment, and two photometers.
LAUNCH DETAILS
VEHICLE
Thor Delta E1AGENCY
United States Air ForceMISSION
Isis 2
MISSION TYPE
Earth Science
TARGET ORBIT
Low Earth Orbit
LAUNCH PAD
Space Launch Complex 2ELAUNCH SITE
Vandenberg SFB, CA, USACOUNTRY
USA
LAUNCH TIME VERIFICATION
CONFIRMEDPrecision: Minute
LAUNCH LIBRARY 2 PRIMARY
API ID: e055ae69-537a-43ef-a2ef-741a5f4b6557
Reported date: Apr 1, 1971 at 02:57 UTC
Last synced: 9 minutes ago
This launch date and time are confirmed by the launch provider. Countdown is active.
LAUNCH MAP
PAD WEATHER
Loading weather…
CAN YOU SEE THIS LAUNCH?
Select a location to check if this launch is visible from where you are
VEHICLE — Thor Delta E1 →
MANUFACTURER
McDonnell Douglas
VARIANT
Delta E1
FLIGHTS
17
SUCCESSES
16
SUCCESS RATE
94.1%
American orbital launch vehicle family with Thor first stage and a delta second stage.
FREQUENTLY ASKED QUESTIONS
When is the Thor Delta E1 | Isis 2 launch?
The Thor Delta E1 | Isis 2 is scheduled for Thursday, April 1, 1971 at 2:57 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 Isis 2?
The Thor Delta E1 | Isis 2 mission uses the Thor Delta E1 rocket, manufactured by McDonnell Douglas. The Thor Delta E1 has flown 17 times with a 94.1% success rate.
Where is the Thor Delta E1 | Isis 2 launching from?
The launch takes place from Space Launch Complex 2E at Vandenberg SFB, CA, USA.
What orbit is Isis 2 going to?
The Isis 2 mission is targeting Low Earth Orbit.
Who is launching Isis 2?
The Thor Delta E1 | Isis 2 is operated by United States Air Force.
Can I watch the Thor Delta E1 | Isis 2 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 28, 2026 21:44 UTC
Launch added to tracker
Imported from Launch Library 2 API
Mar 28, 2026 21:44 UTC
Launch date set: Apr 1, 1971 at 02:57 UTC
NET (No Earlier Than) confirmed by United States Air Force
Mar 28, 2026 21:44 UTC
Launch completed successfully
Updated via Launch Library 2
LIVE DATA SOURCES
Last data sync: 9 minutes ago
●Launch Library 29 minutes ago
Launch ID: e055ae69-537a-43ef-a2ef-741a5f4b6557
●Open-Meteo Weather2 days ago
Pad weather at 34.75, -120.62
Mission Profile
Isis 2 was a Thor Delta E1 mission operated by United States Air Force that lifted off from Space Launch Complex 2E, Vandenberg SFB, CA, USA on April 1, 1971. The flight carried its payload on a earth science mission to Low Earth Orbit. The launch was a success.