Fig. 1
Observations obtained using a CCD camera at the 1.52 m telescope of the Observatorio de Sierra Nevada in Granada, Spain. a) 30P/Reinmuth 1 on May 15, 2010. Isophote levels in solar disk units (SDU) are 2.00 ×10-13, 0.75 ×10-13, and 0.25 ×10-13. b) 78P/Gehrels 2 on December 19, 2011. Isophote levels are 0.55 ×10-12, 2.65 ×10-13, and 1.35 ×10-13. c) 115P/Maury on July 15, 2011. Isophote levels are 1.00 ×10-13, 3.00 ×10-14, and 1.30 ×10-14. d) 118P/Shoemaker-Levy 4 on December 12, 2009. Isophote levels are 1.50 ×10-13, 6.00 ×10-14, 3.50 ×10-14, and 2.00 ×10-14. In all cases, the directions of celestial North and East are given. The vertical bars correspond to 104km in the sky.
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