Fig. 2
Observations obtained using a CCD camera at the 1.52 m telescope of the Observatorio de Sierra Nevada in Granada, Spain. a) 123P/West-Hartley on February 26, 2011. Isophote levels in solar disk units (SDU) are 1.00 ×10-13, 0.35 ×10-13, and 0.15 ×10-13. b) 157P/Tritton on March 10, 2010. Isophote levels are 6.00 ×10-13, 0.75 ×10-13, and 2.65 ×10-14. c) 185P/Petriew on July 15, 2012. Isophote levels are 1.80 ×10-13, 1.00 ×10-13, 0.60 ×10-13, and 0.35 ×10-13. d) P/2011 W2 (Rinner) on January 4, 2012. Isophote levels are 6.00 ×10-14, 2.70 ×10-14, 1.50 ×10-14, and 0.80 ×10-14. In all cases, the directions of celestial North and East are given. The vertical bars correspond to 104 km in the sky.
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