USA-226[1] is the first flight of the second Boeing X-37B, the Orbital Test Vehicle 2 (X-37B OTV-2), an American unmanned robotic vertical-takeoff, horizontal-landing spaceplane. It was launched aboard an Atlas V rocket from Cape Canaveral on 5 March 2011, and landed at Vandenberg Air Force Base on 16 June 2012. It operated in low Earth orbit. Its mission designation is part of the USA series.
![]() The X-37B back on Earth after completing OTV-2 | |
Mission type | Demonstration |
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Operator | Air Force Space Command |
COSPAR ID | 2011-010A[1] |
SATCAT no. | 37375![]() |
Mission duration | 468 days, 13 hours, 2 minutes[2] |
Spacecraft properties | |
Spacecraft type | Boeing X-37B |
Manufacturer | Boeing |
Launch mass | 5,400 kg (11,900 lb)[3] |
Power | Deployable solar array, batteries[3] |
Start of mission | |
Launch date | 5 March 2011, 22:46:00 (2011-03-05UTC22:46Z) UTC[4] |
Rocket | Atlas V 501[3] |
Launch site | Cape Canaveral SLC-41 |
Contractor | United Launch Alliance |
End of mission | |
Landing date | 16 June 2012, 12:48:00 (2012-06-16UTC12:49Z) UTC[2] |
Landing site | Vandenberg, Runway 12 |
Orbital parameters | |
Reference system | Geocentric |
Regime | Low Earth |
Semi-major axis | 6,662 km (4,140 mi)[5] |
Eccentricity | 0.0008[5] |
Perigee altitude | 278.5 km (173.1 mi)[5] |
Apogee altitude | 289.3 km (179.8 mi)[5] |
Inclination | 41.9°[5] |
Period | 90.2 min[5] |
Mean motion | 15.96[5] |
Epoch | 30 May 2012, 02:23:10 UTC[5] |
The spaceplane was operated by Air Force Space Command, which has not revealed the specific identity of the payload for the first flight. The Air Force stated only that the spacecraft would "demonstrate various experiments and allow satellite sensors, subsystems, components, and associated technology to be transported into space and back."[6]
OTV-2 was launched aboard an Atlas V rocket, tail number AV-026, on 5 March 2011 from Space Launch Complex 41 at Cape Canaveral Air Force Station in Florida.[7][8] It was scheduled to launch on the previous day, 4 March, but weather prevented the launch on that day, forcing the reschedule to 5 March.
The launch was conducted by United Launch Alliance.
The X-37B spacecraft was originally intended to be deployed from the payload bay of a NASA Space Shuttle, but following the Columbia accident, it was transferred to a Delta II 7920, then subsequently transferred to the Atlas V following concerns over the X-37B's aerodynamic properties during launch.[3]
Prior to the installation of the spacecraft, the Atlas rocket was moved to the launch pad and performed a wet dress rehearsal on 4 February 2011.[7] It was returned to the Vertical Integration Facility the following day for final assembly.[9]
Most of the mission parameters for the first OTV-2 flight have not been disclosed.[10] The Air Force stated the mission time would depend on progress of the craft's experiments during orbit. On 29 November 2011 a spokesperson for the Secretary of the Air Force announced the mission was extended beyond its original life expectancy, citing ongoing experimentation.[11]
In addition to its unspecified payload, OTV-2 carried a folded solar panel in its cargo bay to power the spacecraft during its year and a half long mission.[12]
Time period | Periapsis (AMSL) |
Apoapsis (AMSL) |
Resonance (orbits:days) |
---|---|---|---|
2011 Mar 5 – 14[13] | 317 km (197 mi)[13] | 319 km (198 mi)[13] | |
2011 Mar 14 – 30[14] | 317 km (197 mi)[14] | 344 km (214 mi)[14] | |
2011 Mar 30 – 16 Jun[15] | 323 km (201 mi)[15] | 339 km (211 mi)[15] | |
After completing its mission, OTV-2 deorbited, entered the atmosphere, and landed at Vandenberg Air Force Base on 16 June 2012 at 05:48 PT (12:48 GMT).[2] OTV-2 is the third reusable spaceplane to perform an automated landing after returning from orbit, the first being the Soviet Buran spacecraft in 1988[16] and the second, its sister craft, the OTV-1.[17]
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Missions |
← 2010 · Orbital launches in 2011 · 2012 → | |
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Elektro-L No.1 | USA-224 | Kounotori 2 | Progress M-09M (Kedr) | Kosmos 2470 | USA-225 | Johannes Kepler ATV | STS-133 (Leonardo) | Kosmos 2471 | Glory · Explorer-1 [Prime] · KySat-1 · Hermes | USA-226 | USA-227 | Soyuz TMA-21 | Compass-IGSO3 | USA-229 | Resourcesat-2 · YouthSat · X-Sat | Yahsat 1A · New Dawn | Progress M-10M | Meridian 4 | USA-230 | STS-134 (AMS-02 · ELC-3) | Telstar 14R | ST-2 · GSAT-8 / INSAT-4G | Soyuz TMA-02M | SAC-D | Rasad 1 | ChinaSat 10 | Progress M-11M | Kosmos 2472 | USA-231 | Shijian XI-03 | STS-135 (Raffaello · PSSC-2) | Tianlian I-02 | Globalstar M083 · Globalstar M088 · Globalstar M091 · Globalstar M085 · Globalstar M081 · Globalstar M089 | GSAT-12 | SES-3 · KazSat-2 | USA-232 | Spektr-R | Compass-IGSO4 | Shijian XI-02 | Juno | Astra 1N · BSAT-3c/JCSAT-110R | Paksat-1R | Hai Yang 2A | Sich 2 · NigeriaSat-2 · NigeriaSat-X · RASAT · EduSAT · AprizeSat-5 · AprizeSat-6 · BPA-2 | Ekspress-AM4 | Shijian XI-04 | Progress M-12M | GRAIL-A · GRAIL-B | Zhongxing-1A | Kosmos 2473 | Arabsat 5C · SES-2 | IGS Optical 4 | Atlantic Bird 7 | TacSat-4 | Tiangong-1 | QuetzSat 1 | Kosmos 2474 | Intelsat 18 | Eutelsat W3C | Megha-Tropiques · SRMSAT · VesselSat-1 · Jugnu | ViaSat-1 | Thijs · Natalia | NPP · E1P-U2 · RAX-2 · M-Cubed · DICE-1 · DICE-2 · AubieSat-1 | Progress M-13M (Chibis-M) | Shenzhou 8 | Kosmos 2475 · Kosmos 2476 · Kosmos 2477 | Fobos-Grunt · Yinghuo-1 | Yaogan 12 · Tian Xun-1| Soyuz TMA-22 | Shiyan Weixing 4 · Chuang Xin 1C | AsiaSat 7 | Mars Science Laboratory (Curiosity) | Kosmos 2478 | Yaogan 13 | Compass-IGSO5 | Amos-5 · Luch 5A | IGS Radar 3 | Pléiades-HR 1A · SSOT · ELISA 1 · ELISA 2 · ELISA 3 · ELISA 4 | NigComSat-1R | Soyuz TMA-03M | Ziyuan-1C | Meridian 5 | Globalstar M080 · Globalstar M082 · Globalstar M084 · Globalstar M086 · Globalstar M090 · Globalstar M092 | |
Payloads are separated by bullets ( · ), launches by pipes ( | ). Crewed flights are indicated in underline. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets). |