Delta II | Gravity Probe B
Launch Successful
L - -- : -- : -- : --
Instantaneous launch window.
Launch Window
April 20, 2004, 4:57 p.m. - April 20, 2004, 4:57 p.m.
Instantaneous launch window.
April 20, 2004, 4:57 p.m. - April 20, 2004, 4:57 p.m.
Gravity Probe B (GP-B) was a satellite-based experiment to test two unverified predictions of general relativity: the geodetic effect and frame-dragging. This was to be accomplished by measuring, very precisely, tiny changes in the direction of spin of four gyroscopes contained in an Earth-orbiting satellite at 650 km (400 mi) altitude, crossing directly over the poles.
Delta II is an American space launch system developed by McDonnell Douglas, now part of the Delta rocket family operated by United Launch Alliance. With more than 150 missions and a nearly perfect track record, Delta II has established itself as one of the most successful orbital launch systems.
See DetailsUnited Launch Alliance (ULA) is a joint venture of Lockheed Martin Space Systems and Boeing Defense, Space & Security. ULA was formed in December 2006 by combining the teams at these companies which provide spacecraft launch services to the government of the United States. ULA launches from both coasts of the US. They launch their Atlas V vehicle from LC-41 in Cape Canaveral and LC-3E at Vandeberg. Their Delta IV launches from LC-37 at Cape Canaveral and LC-6 at Vandenberg.
INFO WIKI12th test flight of the two-stage Starship launch vehicle. Maiden Flight of Starship V3. The flight test’s primary goal will be to demonstrate eac…
Synthetic aperture radar satellite for Japanese Earth imaging company Synspective.
A batch of 29 satellites for the Starlink mega-constellation - SpaceX's project for space-based Internet communication system.
A batch of 24 satellites for the Starlink mega-constellation - SpaceX's project for space-based Internet communication system.
Joint mission between the European Space Agency and the Chinese Academy of Sciences to investigate the interaction between Earth’s protective shield …
18 Low Earth Orbit communication satellites with Ku, Q and V band payloads for the G60 constellation operated by Shanghai Spacesail Technologies with…
34th commercial resupply services mission to the International Space Station operated by SpaceX. The flight will be conducted under the second Commer…
Share-ride of 5 satellites to sun-synchronous orbit: * Taijing-3-05A/B * Tianyi-50 * Tianyan-27 * Jilin-1 HR-03D-55
2.8 tonnes Mass Simulator launched to a 900 km polar orbit on a test flight proving further upgrades to the ZQ-2E, including a longer 1st stage and e…
18 Low Earth Orbit communication satellites with Ku, Q and V band payloads for the G60 constellation operated by Shanghai Spacesail Technologies with…