Spiral Galaxy in M81 Group (NGC 2403) (Scott Denning)

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

Spiral Galaxy in M81 Group (NGC 2403), Scott Denning

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Spiral Galaxy in M81 Group (NGC 2403)

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Spiral Galaxy in M81 Group (NGC 2403)

NGC 2403 in Camelopardalis (The Celestial Giraffe) Jan-Feb 2021

279 x 120s RGB & 56 x 600s Ha (total 18.6 hours exposure over many nights

Ha during full moon, RGB during waning moon

C8 Edge HD (1494 mm, f/7) with ASI1600 monochrome camera & ZWO filters

Guided with ASI 174mini & OAG on 10Micron GM1000 mount

This galaxy is part of a group of neighboring galaxies but not gravitationally bound in our Local Group. It’s part of the M81 group of galaxies and floats in intergalactic space near the celestial pole. It’s about 50,000 light years across and is located about 8 million light years distant, so we look back in time to see it before the dawn of humanity.

The galaxy is forming a lot of stars which show up in it’s bright blue spiral arms and cause ionize huge clouds of hydrogen gas that glows bright red. The enhanced star formation may be due to copious amounts of infalling gas. The core of the galaxy is golden yellow because the stars there are old. Big bright blue stars are young and burn out very quickly, leaving the core with that characteristic buttery glow.

The M81 group floats near the galactic pole, well above the plane of our Milky Way galaxy. Though NGC2403 is technically within the bounds of Camelopardalis, it lies about midway between the nose of the Great Bear of Ursa Major and the celestial Giraffe. It crosses high above the northern sky these late winter nights.

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Basic success
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Astrometry.net job	4221985
PixInsight job	n/a
PixInsight queue size	n/a
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Spiral Galaxy in M81 Group (NGC 2403)

Spiral Galaxy in M81 Group (NGC 2403)

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Spiral Galaxy in M81 Group (NGC 2403)

Spiral Galaxy in M81 Group (NGC 2403)

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