Comet C/2012 S1 (ISON) is in outburst just before perihelium, this can be a sign that this comet dousn't survive the perihelium passage round the sun and possible desintegration of this comet! Af(rho) with R-Bessel value about 702 cm and 620 cm for I-Bessel filter on 13.2 UT 2013

more data can you find on http://www.astronomie.be/erik.bryssinck/c2012s1_20131113.html  other images and data can you find on: http://www.astronomie.be/erik.bryssinck/c2012s1.html.