IC1805 The Heart Nebula in Cassiopeia.
This image is a color composite using a stack of 16 eight-minute exposures taken through an Hα filter (shown in the image below)
as the luminance channel, and 5 eight-minute stacks each taken through red, green and blue filters for the colors.
The images were acquired using an STL11000M CCD camera on a Tele Vue NP101is.
The exposures were calibrated, defect-corrected, stacked and color-balanced using AIP4WIN V2.
This image has been resampled down from its original size of 4008x2672.