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USA-277, also referred to as Orbital Test Vehicle 5 (OTV-5), is the third flight of the second Boeing X-37B, an American unmanned vertical-takeoff, horizontal-landing spaceplane. It was launched to low Earth orbit aboard a Falcon 9 rocket from LC-39A on September 7, 2017. Its mission designation is part of the USA series.

USA-277
Launch of OTV-5
Mission typeClassified
OperatorAir Force Space Command
COSPAR ID2017-052A
SATCAT no.42932
Mission duration2 years, 1 month and 20 days
Spacecraft properties
Spacecraft typeBoeing X-37B
ManufacturerBoeing
Launch mass5,400 kg (11,900 lb)[1]
PowerDeployable solar array, batteries[1]
Start of mission
Launch date7 September 2017 (2017-09-07Z)
RocketFalcon 9
Launch siteLC-39A
ContractorSpaceX
End of mission
Landing date27 October 2019 (2019-10-28)
Landing siteShuttle Landing Facility
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Perigee altitude355 km (221 mi)
Apogee altitude356 km (221 mi)
Inclination54.5 degrees
 

The spaceplane was operated by Air Force Space Command, which considers the mission classified and as such has not revealed the objectives. However, the Air Force did reveal that among the onboard payloads was an experimental oscillating heat pipe.[2] Additionally, it was revealed after OTV-5 landed that it had deployed three cubesats in orbit.[3]


Mission


OTV-5 is the third mission for the second X-37B,[4] and the fifth X-37B mission overall. It flew on Falcon 9 booster B1040 from Kennedy Space Center Launch Complex 39A, which touched down at Landing Zone 1 following launch.[5]

OTV-5 was deployed into an orbital inclination of 54.5°, higher than previous X-37B missions. The Air Force has not disclosed the reason for this.[6]

After a record-setting 780 days in orbit, OTV-5 returned to land at the Shuttle Landing Facility on October 27, 2019.[3]


Satellite Deployments


Sometime during its orbital mission, OTV-5 deployed three cubesats, given the designations USA 295, 296 and 297. The deployment was not announced until after OTV-5 had landed, which led to many accusing the US of breaking the Registration Convention.[7] The convention, which the US has ratified, requires newly deployed satellites to be promptly registered with the United Nations Office for Outer Space Affairs.[8]


See also



References


  1. Krebs, Gunter D. "X-37B OTV 1, 2, 3". Gunter's Space Page. Retrieved 10 July 2013.
  2. "Air Force preparing to launch fifth Orbital Test Vehicle mission". U.S. Air Force. Retrieved 16 May 2020.
  3. "USA 295, 296, 297". space.skyrocket.de. Retrieved 16 May 2020.
  4. Graham, William (15 May 2020). "ULA Atlas V launches sixth mission for X-37B spaceplane". NasaSpaceflight.com. Retrieved 28 April 2021.
  5. Shanklin, Emily (7 September 2017). "OTV-5 Mission". SpaceX. Retrieved 16 May 2020.
  6. Trevithick, Joseph. "Here's What We Know The Shadowy X-37B Was Up To During Its Record 780 Days In Space". The Drive. Retrieved 16 May 2020.
  7. McDowell, Jonathan (2 January 2020). "Analysis: Was the X-37B/OTV mission 5 illegal under international law?". Seradata. Retrieved 16 May 2020.
  8. "Registration Convention". www.unoosa.org. Retrieved 16 May 2020.


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