Galaxy NGC 2403, Caldwell 7 (Steven Bellavia)

Celestial hemisphere: Northern · Constellation: Camelopardalis (Cam) · Contains: NGC 2403

Galaxy NGC 2403, Caldwell 7, Steven Bellavia

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Galaxy NGC 2403, Caldwell 7

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Galaxy NGC 2403, Caldwell 7

NGC2403 is a somewhat large (21.9' x 12.3' - the moon is 30') and bright (mag 8.9) object. It is visible in binoculars. It is also a Caldwell Object, designated as C7

NGC2403 (Caldwell 7) is an intermediate spiral galaxy in the constellation Camelopardalis. NGC 2403 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 replete with star-forming H II regions, which are made more evident in the image due to the use of a narrowband H-alpha filter.

The galaxy was discovered by William Herschel in 1788. Allan Sandage detected Cepheid variables in NGC 2403 using the Hale telescope, giving it the distinction of being the first galaxy beyond the Local Group within which a Cepheid was discovered. He derived a distance of a mere 8
thousand light years. Today, it is thought to be a thousand times further away at about 8 million light years.

Final
Original
B

B

Description: Supernova Remnant and globular clusters from this paper:

https://articles.adsabs.harvard.edu/full/1984A%26A...130..162B

Special thanks to Gary Imm, and his image of NGC 2403, which showed the supernova remnant and some globular clusters so I could find those and others in my image.
And also special thanks to Phil Harrington, who got me looking for the designations

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Galaxy NGC 2403, Caldwell 7

Galaxy NGC 2403, Caldwell 7

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Galaxy NGC 2403, Caldwell 7

Galaxy NGC 2403, Caldwell 7

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