Covering of the sky path of TNO (54598) Bienor from 2012 June 1 to 2014 Dec. 31. The blue (dashed) line represents the path of the TNO as seen by a ground-based observer. The region within the red (dotted) squares represent the area covered by the WFI mosaic. The uncovered segments of the path are those where the Sun-observer-target angle is smaller than 30°. The timeline starting point of the path is the bottom-left extremity of the blue (dashed) line. In this timeline, the frames corresponding to year 2013 start at RA about 0.9 h and end at RA about 1.2 h.