NGC 2403 - Caldwell 7

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. NGC 2403 can be observed using 10×50 binoculars. NGC 2404 is 2000 light-years in diameter, making it one of the largest known H II regions, even larger than Tarantula Nebula in Large Magellanic Cloud. This H II region represents striking similarity with NGC 604 in M33, both in size and location in galaxy.

 

Acquired on September 2018

 

Luminance - 320 x 45 sec

Light pollution - 82 x 180 sec

H-alpha - 54 x 180 sec

Red - 60 x 90 sec

Green - 55 x 90 sec

Blue - 65 x 90 sec

Total integration time: 15:18 hours

 

Imaging telescope and camera:

 

TS Optics Ritchey-Chrétien 203/1080-1624 mm with 0.67x AP reducer.

 

ASI1600MM-Cool

 

Processed with: Pixinsight and Photoshop CC

 

Location:

 

Home Backyard, Geleen, Limburg, Netherlands (Bortle 6/7)

Done