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OTV 4 (USA 261)

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OTV 4 (USA 261) is classified as:


NORAD ID: 40651
Int'l Code: 2015-025A
Perigee: 353.3 km
Apogee: 361.4 km
Inclination: 38.0 °
Period: 91.5 minutes
Semi major axis: 6728 km
RCS: Unknown
Launch date: May 20, 2015
Source: United States (US)
Launch site: AIR FORCE EASTERN TEST RANGE (AFETR)

OTV 4 (USA 261) also known as X-37B is a reusable unmanned spacecraft. OTV 4 is a fourth X-37B mission codenamed AFSPC-5, launched aboard an Atlas V rocket from Cape Canaveral Air Force Station on May, 20 2015. The launch was designated USA-261, and is the second flight of the second X-37B vehicle. The mission will test a Hall effect thruster in support of the Advanced Extremely High Frequency communications satellite program, and conduct a NASA investigation for testing various materials in space. The mission is expected to last at least 200 days.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 40651U 15025A   15298.13741097  .00000000  00000-0  00000-0 0    09
2 40651  38.0316  21.3774 0006000 215.6219 144.4165 15.73037359    03
Source of the keplerian elements: McCants