NGC 2403 Galaxy from a White Zone (Douglas J Struble)

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

NGC 2403 Galaxy from a White Zone, Douglas J Struble

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NGC 2403 Galaxy from a White Zone

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NGC 2403 Galaxy from a White Zone

I had the hardest time processing this galaxy. I was not happy at all with my initial post, so I started from scratch. It was a major challenge given my red zone along with poor transparency during my Michigan winter. So very faint.

NGC 2403 (also 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 containing numerous star-forming H II regions. The northern spiral arm connects it to a Star forming region NGC 2404. NGC 2403 can be observed using 10×50 binoculars.

As of late 2004, there had been two reported supernovae in the galaxy: SN 1954J, which attained a magnitude of 16 at its brightest, and SN 2004dj.

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 (2.5 Mpc).

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