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- USA-261, also referred to as Orbital Test Vehicle 4 (OTV-4) or AFSPC-5, is the second flight of the second Boeing X-37B, an American unmanned vertical-takeoff, horizontal-landing spaceplane. It was launched to low Earth orbit aboard an Atlas V rocket from Cape Canaveral on May 20, 2015. Its mission designation is part of the USA series. The spaceplane was operated by the Air Force Space Command, which considers the mission classified and as such has not revealed the objectives. However, the Air Force did reveal that the X-37 would be carrying an experimental hall-effect thruster for testing ahead of potential use in future AEHF satellites. Additionally, NASA announced it was flying a materials science payload similar to MISSE called METIS. (en)
- X-37B OTV-4 eller USA-261 var den fjärde rymdflygningen av en X-37B, av USA:s flygvapen. Man ville inte avslöja vad farkosten ska användas till, utan meddelade bara att man bland annat ska testa en mängd olika material och en jonmotor kallad XR-5A, från företaget Aerojet Rocketdyne. Uppskjutningen skedde den 20 maj 2015, med en Atlas V-raket från Cape Canaveral Air Force Station i Florida. Efter 718 dagar i rymden landade farkosten på Kennedy Space Center i Florida den 7 maj 2017. (sv)
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- Deployable solar array, batteries (en)
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- X-37B OTV-4 eller USA-261 var den fjärde rymdflygningen av en X-37B, av USA:s flygvapen. Man ville inte avslöja vad farkosten ska användas till, utan meddelade bara att man bland annat ska testa en mängd olika material och en jonmotor kallad XR-5A, från företaget Aerojet Rocketdyne. Uppskjutningen skedde den 20 maj 2015, med en Atlas V-raket från Cape Canaveral Air Force Station i Florida. Efter 718 dagar i rymden landade farkosten på Kennedy Space Center i Florida den 7 maj 2017. (sv)
- USA-261, also referred to as Orbital Test Vehicle 4 (OTV-4) or AFSPC-5, is the second flight of the second Boeing X-37B, an American unmanned vertical-takeoff, horizontal-landing spaceplane. It was launched to low Earth orbit aboard an Atlas V rocket from Cape Canaveral on May 20, 2015. Its mission designation is part of the USA series. (en)
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- USA-261 (en)
- X-37B OTV-4 (sv)
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