NGC 2403 (also known as Caldwell 7) is an intermediate spiral galaxy in the constellation Camelopardalis. It is an outlying member of the M81 Group,and is approximately 8 million light-years distant. It bears a similarity to M33, being about 50,000 light years in diameter and containing numerous star-forming H II regions. The northern spiral arm connects it to the star forming region NGC 2404. This H II region represents striking similarity with NGC 604 in M33, both in size and location in galaxy. (Write up by Wiki)
Revision B is slightly cropped from Ori while the revision A is a close-up portrait.
The image consists of the following data taken by me only:
L 192 x 600s = 32.0h
R 30 x 600s = 5h
G 28 x 600s = 4.7h
B 30 x 600s = 5h
Ha 35x 600s= 5.8 h
Overall: 315 frames, 52.5 h.
Dates: Dec 10,11,15 / Jan 6,7,8,9,10,12,13
Location of Remote Observatory: Daocheng Obs, Sichuan,China
Raw data capture and batch pre-process: John Chuhong Yu
Post process: John Chuhong Yu
Special thanks to: Grapeot, who kindly shared his briliant method of adding stretched Ha data to LRGB using Photoshop. He has uploaded
tutorial on YouTube and Bilibili.
Hope that you enjoy this image!
DO NOT CROP MY PIC AND USE THIS PIC FOR COMMERCIAL USE WITHOUT MY APPROVE.
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