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USA 299 (X-37B; OTV 6)

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USA 299 (X-37B; OTV 6) is classified as:


NORAD ID: 45606
Int'l Code: 2020-029A
Perigee: 392.7 km
Apogee: 396.7 km
Inclination: 45.0 °
Period: 92.3 minutes
Semi major axis: 6765 km
RCS: Unknown
Launch date: May 17, 2020
Source: United States (US)
Launch site: AIR FORCE EASTERN TEST RANGE (AFETR)

X-37B (USA 299), also known as the Orbital Test Vehicle (OTV), is a reusable robotic spacecraft. It is boosted into space by a launch vehicle, then re-enters Earth's atmosphere and lands as a spaceplane. While the X-37B's exact purpose is a secret, Space Force officials have revealed that the craft is packing numerous experiments on this trip to test out different systems in space. Some of those experiments include a small satellite called FalconSat-8, two NASA payloads designed to study the effects of radiation on different materials as well as seeds to grow food, and a power-beaming experiment using microwave energy.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 45606U 20029A   21286.00573477 0.00000000  00000-0  00000-0 0    09
2 45606  45.0380 259.8000 0003004  89.9765 270.0231 15.60030799    03
Source of the keplerian elements: McCants