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C7
Hubble · Caldwell 7 · NASA, ESA, A.V. Filippenko (University of California, Berkeley), P. Challis (Harvard-Smithsonian Center for Astrophysics), et al.

Caldwell 7

Galaxy in Camelopardalis · 8 million light-years

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TypeGalaxy
ConstellationCamelopardalis
Right ascension7h 36m 51s
Declination+65° 36′
Object distance8 million light-years
Apparent magnitude8.4
Apparent size19.9′ (arc-minutes)
Approx. true diameter46,309 light-years across
Also known asC7 · NGC 2403
Caldwell 7 is a galaxy (NGC 2403) in the constellation Camelopardalis — a distant island of stars far beyond the Milky Way. It appears as number 7 in the Caldwell catalogue, Sir Patrick Moore's 1995 list of 109 bright deep-sky objects for amateur astronomers. It spans roughly 19.9 arc-minutes on the sky. At about magnitude 8.4, it shows up in a small backyard telescope.

Although it appears about 19.9′ wide on the sky, its real span is roughly 46,309 light-years — the difference is a measure of how far away it lies.

Observing Caldwell 7

Caldwell 7 lies in the constellation Camelopardalis and is best placed in the evening sky around January. Its maximum altitude above the horizon depends on your latitude. It sits far enough north to be circumpolar from mid-northern latitudes, and never rises for most of the southern hemisphere. A small backyard telescope will show it; binoculars may hint at it under dark skies. Note that the listed magnitude is spread across the whole object — diffuse galaxies and nebulae are often harder to see than the number alone suggests, so dark, moonless skies help a great deal.

See Caldwell 7 in Universe Finder

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