Comet Lovejoy C/2014 Q2 on Jan. 10, 2015

This is Comet Lovejoy C/2014 Q2 as it appeared at about 10:30 pm Saturday, Jan. 10, 2015, from my back yard in Belmont, MA, about 5 miles west of downtown Boston.  The comet is quite bright and could be seen easily in my 10x50 binoculars.

Technical details: The area pictured here is about 2.2 by 1.5 degrees in size.   This image was made in Photoshop by stacking four exposures taken using a Canon 6D camera on a fixed tripod with a 200mm telephoto lens, each exposure being 2 seconds at f/2.8 and ISO 4000.  I applied a flat-field image to correct for vignetting, and then subtracted out a considerable amount of light-pollution sky glow.