Spiral Galaxy NGC 2403

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About this Image

NGC 2403 is an intermediate size spiral galaxy in the northern constellation Camelopardalis.
This galaxy (also Caldwell 7) is an outlying member of the M81 Group and is approximately 8 million light-years distant. It bears a striking similarity to M33, being about 50,000 light years in diameter and containing numerous extended star-forming H II regions glowing in red.

North is up.

Find a high resolution Hubble/Subaru combined image of this galaxy processed by Rob Gendler here.


Technical Details


16" cassegrain in corrected secondary focus at f/10

Mount ASA DDM-85XL
Camera SBIG STX16803 at -30C, STX filter wheel
Filters Baader 65x65mm LRGB
Date February 2012
Location Wildon/Austria
Sky Conditions mag 5.5 sky, raw FWHM 1.3-1.8", temperature -5 C
Exposure Ha:L:R:G:B = 180:600:80:100:100 minutes (30-minute sub-exposures for H-alpha, 20 min subs for LRGB)
Programs used Autoslew
Maxim DL 5
Photoshop CS5