NGC 7331

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discovery

It [NGC 7331] was discovered by William Herschel on 6 September 1784.

galaxy of

Pegasus

Hubble Space Telescope

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rotation

In spiral galaxies the central bulge typically co-rotates with the disk but the bulge in the galaxy NGC 7331 is rotating in the opposite direction to the rest of the disk.

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visibility

Late autumn skies will provide the best view from the Northern Hemisphere (or spring skies in the Southern Hemisphere). However, with a magnitude of 9.5, Caldwell 30 will require a telescope or large binoculars to see it for yourself. In light-polluted skies, only the central core of the galaxy is visible. Under dark skies, a large telescope will also reveal the galaxy’s sweeping spiral arms.

Wikidata

https://www.wikidata.org/wiki/Q671450

Wikipedia

NGC 7331 (Wikipedia) NGC 7331, also known as Caldwell 30, is an unbarred spiral galaxy about 40 million light-years (12 Mpc) away in the constellation Pegasus. It was discovered by William Herschel in 1784. NGC 7331 is the brightest galaxy in the field of a visual grouping known as the NGC 7331 Group of galaxies. In fact, the other members of the group, NGC 7335, 7336, 7337 and 7340, lie far in the background at distances of approximately 300–350 million light years.