NGC 2403 is a moderate sized spiral galaxy in Camelopardalis and is believed to be part of the M81 galaxy group. The galaxy measures about 20' x 12'.

In this image, North is Up. This image is cropped to 56% of the original full frame.

Exposure Details
Lens	Celestron C-8 SCT with Celestron focal reducer
Focal Length	1260mm
Focal Ratio	f/6.3
Mount	Schaefer GEM - 7 1/2
Guiding	80mm f/11 guidescope with PHD Guiding
Camera	Canon 20Da
Exposure	101 subexposures of 180 seconds each at ISO 1600 - about 5 hours total exposure.
Calibration	30 darks, 30 flats, 30 bias
Date	October 22 and 24, 2011
Temperature	59F on 10/22, 52F on 10/24
SQM Reading
Seeing	4 of 5 on 10/22, 3 of 5 on 10/24
Location	Pine Mountain Club, California
Software Used	Images Plus 4.0 for camera control, calibration, stacking, and digital development. Images Plus 5.0 for advanced Lucy-Richardson deconvolution, multiresolution sharpening, star shrinking, smoothing and noise reduction. Photoshop CS5 used for levels and curves, selective color, high pass filter, saturation adjustments, color channel alignment, screen mask invert, lens correction, and smart sharpen. Gradient Xterminator for gradient removal. Carboni Tools for additional saturation adjustments, noise reduction, and smoothing. HLVG for additional color correction. Registar 1.0 for stack alignment.
Notes	I enjoyed imaging this object, as it is not a commonly photographed galaxy. While it isn't as impressive as larger galaxies, I like the detail this object has, and I was very pleased with the final result. This image was published by Astronomy Magazine as its Picture of the Day for March 25, 2016.