USA-240

USA-240, also referred to as Orbital Test Vehicle 3 (OTV-3), is the second flight of the first Boeing X-37B, an American unmanned robotic vertical-takeoff, horizontal-landing spaceplane. It was launched to low Earth orbit aboard an Atlas V rocket from Cape Canaveral on 11 December 2012. Its mission designation is part of the USA series.

USA-240

Launch of USA-240
Mission type	Demonstration
Operator	U.S. Air Force
COSPAR ID	2012-071A
SATCAT no.	39025
Mission duration	1 year, 10 months and 6 days
Spacecraft properties
Spacecraft type	Boeing X-37B
Manufacturer	Boeing
Launch mass	5,400 kg (11,900 lb)[1]
Power	Deployable solar array, batteries[1]
Start of mission
Launch date	11 December 2012, 18:03 UTC (2012-12-11UTC18:03Z)[2]
Rocket	Atlas V 501
Launch site	Cape Canaveral SLC-41
Contractor	United Launch Alliance
End of mission
Landing date	17 October 2014, 16:24 UTC (2014-10-17UTC16:25Z)[3]
Landing site	Vandenberg AFB
Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Semi-major axis	6,698.18 km (4,162.06 mi)[4]
Eccentricity	0.0009437[4]
Perigee altitude	320 km (200 mi)[4]
Apogee altitude	333 km (207 mi)[4]
Inclination	43.50 degrees[4]
Period	90.93 minutes[4]
Mean motion	15.84[4]
Epoch	13 August 2014, 18:50:13 UTC[4]

The spaceplane is operated by the United States Air Force, which has not revealed the specific objectives of the mission or identity of the mission's payload. The Air Force stated only that the "mission will incorporate the lessons learned during the refurbishment process on OTV-1. As the X-37B program is examining the affordability and reusability of space vehicles, validation through testing is vital to the process. We are excited to see how this vehicle performs on a second flight."[5][6]

Mission

OTV-3, the second mission for the first X-37B, and the third X-37B mission overall, was originally scheduled to be launched on 25 October 2012,[7] but was postponed because of an engine issue with the Atlas V launch vehicle.[8] The X-37B was successfully launched from Cape Canaveral on 11 December 2012.[5][6] In March 2014, OTV-3 broke the X-37B program's endurance record by passing 470 days in space.[9][10]

The vehicle landed at Vandenberg AFB on 17 October 2014 at 16:24 UTC, having spent just short of 675 days in orbit.[3][11]

See also

• 2012 in spaceflight
• USA-212
• USA-226

References

1. Krebs, Gunter D. "X-37B OTV 1, 2, 3". Gunter's Space Page. Retrieved 10 July 2013.
2. "OTV 3: Launch information". National Space Science Data Center. NASA. Retrieved 10 July 2013.
3. "Secret space plane lands at US air force base after unknown two-year mission". The Guardian. Associated Press. 17 October 2014. Retrieved 17 October 2014.
4. "OTV 3 (USA 240) Satellite details 2012-071A NORAD 39025". N2YO. 13 August 2014. Retrieved 5 October 2014.
5. "OTV 3". National Space Science Data Center. NASA. Retrieved 24 December 2012.
6. Badger, Eric (11 December 2012). "Air Force launches 3rd X-37B Orbital Test Vehicle". AF.mil. U.S. Air Force. Archived from the original on 21 February 2013. Retrieved 24 December 2012.
7. Ray, Justin (18 September 2012). "Another Atlas 5 readied to launch mini space shuttle". Spaceflight Now. Retrieved 24 December 2012.
8. McCullough, Amy (25 October 2012). "X-37B Launch Delayed". Air Force Magazine. Air Force Association. Retrieved 24 December 2012.
9. David, Leonard (27 March 2014). "US Air Force's Secretive X-37B Space Plane Shatters Orbital Endurance Record". Space.com. Retrieved 2 April 2014.
10. Hoffman, Mike (1 April 2014). "Air Force's X-37B Breaks Orbit Record". DefenseTech.org. Retrieved 2 April 2014.
11. Wall, Mike (17 October 2014). "X-37B Military Space Plane Lands After Record-Shattering Secret Mission". Space.com. Retrieved 17 October 2014.