Light curve of 288P. The data obtained by Gemini South GMOS are shown by orange circles and by Keck II DEIMOS by blue circles. The R magnitude is for 1.0 AU heliocentric and geocentric distances but was not corrected for the phase angle effect (explanation is given in the text). The UT date presents the moment of time retarded to the object’s position and given in fractions of a day starting from 0:0 UT on 21 May 2015.