Planetary Nebula Abell 39 in Hercules
Abell 39 (also known as PLN 47+42.1) is a small planetary nebula in Hercules. Like other planetary nebula, it represents the remnant of a dying star
that is blowing off its outer layers.  It is dim (magnitude 13.7) and small (2.6 x 2.6')), requiring dark skies, a large aperture to collect scarce photons,
steady skies, and precise tracking.  See my article on photographing planetary nebula in
Sky & Telescope Magazine in October 2012.

This image combined 80 minutes of clear luminance, 28 minutes of red, 28 minutes green and 20 minutes of blue exposures, all unbinned.  A
QSI-583wsg camera was used through a 12" Astro-physics Ricardi-Honders f/3.8 astrograph at the Hidden Lake Observatory.  
Music:  No Sunshine When She's Gone