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Hubble · Caldwell 30 · ESA/Hubble & NASA/D. Milisavljevic (Purdue University)

Caldwell 30

Galaxy in Pegasus · 38.114 million light-years (est. from redshift)

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TypeGalaxy
ConstellationPegasus
Right ascension22h 37m 04s
Declination+34° 25′
Object distance38.114 million light-years (est. from redshift)
Apparent magnitude9.4
Apparent size9.3′ (arc-minutes)
Approx. true diameter103,107 light-years across
Also known asC30 · NGC 7331
Caldwell 30 is a galaxy (NGC 7331) in the constellation Pegasus — a distant island of stars far beyond the Milky Way. It appears as number 30 in the Caldwell catalogue, Sir Patrick Moore's 1995 list of 109 bright deep-sky objects for amateur astronomers. It spans roughly 9.3 arc-minutes on the sky. At about magnitude 9.4, it shows up in a small backyard telescope.

Although it appears about 9.3′ wide on the sky, its real span is roughly 103,107 light-years — the difference is a measure of how far away it lies.

Observing Caldwell 30

Caldwell 30 lies in the constellation Pegasus and is best placed in the evening sky around August. Its maximum altitude above the horizon depends on your latitude. It is best placed for observers in the northern hemisphere, and sits low for those far south. 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.

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Sources

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