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OTV 4 (USA 261)

OTV 4 (USA 261) is no longer on orbit
OTV 4 (USA 261) is classified as:

NORAD ID: 40651
Int'l Code: 2015-025A
Launch date: May 20, 2015
Source: United States (US)
Decay date: 2017-05-07

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):

Source of the keplerian elements: McCants