USA-277, also referred to as Orbital Test Vehicle 5 (OTV-5), is the third flight of the second

Boeing The Boeing Company, or simply Boeing (), is an American multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets, satellites, and missiles worldwide. The company also provides leasing and product support s ...

X-37B The Boeing X-37, also known as the Orbital Test Vehicle (OTV), is a reusable robotic spacecraft. It is boosted into space by a launch vehicle, re-enters Earth's atmosphere, and lands as a spaceplane. The X-37 is operated by the Department of t ...

, an American unmanned vertical-takeoff, horizontal-landing

spaceplane A spaceplane is a vehicle that can flight, fly and gliding flight, glide as an aircraft in Earth's atmosphere and function as a spacecraft in outer space. To do so, spaceplanes must incorporate features of both aircraft and spacecraft. Orbit ...

. It was launched to

low Earth orbit A low Earth orbit (LEO) is an geocentric orbit, orbit around Earth with a orbital period, period of 128 minutes or less (making at least 11.25 orbits per day) and an orbital eccentricity, eccentricity less than 0.25. Most of the artificial object ...

aboard a

Falcon 9 Falcon 9 is a Reusable launch system#Partial reusable launch systems, partially reusable, two-stage-to-orbit, medium-lift launch vehicle designed and manufactured in the United States by SpaceX. The first Falcon 9 launch was on June 4, 2010, an ...

rocket from

LC-39A Launch Complex 39A (LC-39A) is the first of Kennedy Space Center Launch Complex 39, Launch Complex 39's three launch pads, located at NASA's Kennedy Space Center in Merritt Island, Florida. The pad, along with Launch Complex 39B, was built in t ...

on September 7, 2017. Its mission designation is part of the USA series. The spaceplane was operated by

Air Force Space Command An atmosphere () is a layer of gases that envelop an astronomical object, held in place by the gravity of the object. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low. A stellar atmosphere ...

, which considers the mission

classified Classified may refer to: General *Classified information, material that a government body deems to be sensitive *Classified advertising or "classifieds" Music *Classified (rapper) (born 1977), Canadian rapper * The Classified, a 1980s American ro ...

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. Additionally, it was revealed after OTV-5 landed that it had deployed three

cubesats A CubeSat is a class of small satellite with a form factor of cubes. CubeSats have a mass of no more than per unit,, url=https://static1.squarespace.com/static/5418c831e4b0fa4ecac1bacd/t/5f24997b6deea10cc52bb016/1596234122437/CDS+REV14+2020-07-3 ...

in orbit.

Mission

OTV-5 is the third mission for the second X-37B, and the fifth X-37B mission overall. It flew on

booster B1040 from

Kennedy Space Center Launch Complex 39A Launch Complex 39A (LC-39A) is the first of Launch Complex 39's three launch pads, located at NASA's Kennedy Space Center in Merritt Island, Florida. The pad, along with Launch Complex 39B, was built in the 1960s to accommodate the Saturn V l ...

, which touched down at

Landing Zone 1 Landing Zone 1 and Landing Zone 2, also known as LZ-1 and LZ-2 respectively, are landing facilities at Cape Canaveral Space Force Station used by SpaceX. They allow the company to land the first stage of its Falcon 9 rocket or the two side boost ...

following launch. It was fastest turnaround of a X-37B at 123 days. OTV-5 was deployed into an

orbital inclination Orbital inclination measures the tilt of an object's orbit around a celestial body. It is expressed as the angle between a reference plane and the orbital plane or axis of direction of the orbiting object. For a satellite orbiting the Earth ...

of 54.5°, higher than previous X-37B missions. The Air Force has not disclosed the reason for this. After a record-setting 780 days in orbit, OTV-5 returned to land at the

Shuttle Landing Facility The Shuttle Landing Facility (SLF), also known as Launch and Landing Facility (LLF) , is an airport located on Merritt Island, Florida, Merritt Island in Brevard County, Florida, Brevard County, Florida, United States. It is a part of the Kennedy ...

on October 27, 2019.

Satellite Deployments

Sometime during its orbital mission, OTV-5 deployed three

, 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 The Convention on Registration of Objects Launched into Outer Space (commonly known as the Registration Convention) was adopted by the United Nations General Assembly in 1974 and went into force in 1976. As of February 2022, it has been ratified ...

. The convention, which the US has ratified, requires newly deployed satellites to be promptly registered with the

United Nations Office for Outer Space Affairs The United Nations Office for Outer Space Affairs (UNOOSA) is an office of the U.N. Secretariat that promotes and facilitates peaceful international cooperation in outer space. It works to establish or strengthen the legal and regulatory fram ...

References

{{Orbital launches in 2017 Spacecraft launched in 2017 Satellites of the United States Air Force Spacecraft which reentered in 2019 USA satellites Boeing X-37

Mission

Satellite Deployments

See also

References