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Although the U.S. military will not release the exact orbital parameters of the spaceplane currently in orbit about Earth, amateur trackers of the spaceplane have reported that it is in an approximate 340-kilometer (210-mile) orbit with an inclination (tilt) of about 42.8 degrees to the equator.
However, over the past few weeks it has lowered its orbit in preparation for deorbit and return to Earth.
According to the 6/5/2012 CBS Space News article Vandenberg AFB preps for X-37B landing, Air Force General William L. Shelton, who is the commander of the Air Force Space Command, stated, "Our second X-37 test vehicle has been on orbit for 409 days now, much longer than the 270-day baseline design spec. Although I can't talk about mission specifics, suffice it to say this mission has been a spectacular success."
