|One hour exposure on Comet ISON, La Cañada 0,40 m F10 Ritchey-Chretien telescope|
Comet C/2012 S1 ISON from Observatorio de La Cañada J87 on 05-January-2013
Signal to noise ratio in Y-axis, full width at half maximum FWHM in X-axis, comet in red, surrounding stars in blue.
Comet C/2012 S1 ISON, not an obvious comet at the moment, displays a coma size of 15 arc seconds in diameter. This Sun grazer comet is supposed to brighten in its approach to perihelion by 28-November-2013 to become one of these comets to remember.