#COLORADO SPRINGS — #Astroscale is moving into the next phase of an inspection mission as its #spacecraft approaches a derelict upper stage in low Earth orbit.
Astroscale announced April 11 that its Active Debris Removal by Astroscale-Japan (ADRAS-J) spacecraft, launched Feb. 18, had moved to within several hundred kilometers of an upper stage from an H-2A launch in 2009 left in low Earth orbit and was now relying on its own sensors to continue its approach.
The mission milestone was a switch from absolute navigation, where the spacecraft was maneuvered by ground controllers based on knowledge of its position as well as that of the upper stage, to “Angles-Only Navigation,” where ADRAS-J detected the upper stage using onboard cameras and calculated its relative position.
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