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Fig. 1


Light curve of 358P on 28 July 2017 observed with SOAR/Goodman (top panel) and on 18 August 2017 observed with VLT/FORS2 (bottom panel). The flux was measured in apertures of radius 1.3D, and for the VLT data set corrected by an offset of –0.09 mag to account for the loss of flux due to the small aperture. This correction was not applied for the SOARdata set because the FWHM was measured as average over the moderately trailed stars. The loss of flux due to the small aperture was therefore less than in the FORS data. The correction would have been small compared to the large scatter and error bars of the data. Open symbols in the bottom panel indicate data obtained after UT 8:00 for comparison with Fig. 2. The scale on the right-hand side vertical axes indicates the derived absolute magnitude according to Eq. (1) and for G = 0.15. The shaded areas in both panels indicate the range of absolute magnitudes covered by the VLT data.

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