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M81
Hubble · Messier 81 · NASA, ESA and the Hubble Heritage Team (STScI/AURA)

Bode's Galaxy

Galaxy in Ursa Major · 11.8 million light-years

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TypeGalaxy
ConstellationUrsa Major
Right ascension9h 55m 33s
Declination+69° 04′
Object distance11.8 million light-years
Apparent magnitude6.9
Apparent size21.6′ (arc-minutes)
Approx. true diameter74,142 light-years across
Also known asM81 · NGC 3031
Messier 81, popularly known as Bode's Galaxy, is a galaxy (also catalogued as NGC 3031) in the constellation Ursa Major — an island of billions of stars far beyond our own Milky Way. It was recorded by Charles Messier in his famous catalogue of 110 deep-sky objects. It spans roughly 21.6 arc-minutes on the sky. At about magnitude 6.9, it is an easy target for binoculars and small telescopes.

Although it appears about 21.6′ wide on the sky, its real span is roughly 74,142 light-years — the difference is a measure of how far away it lies.

Observing Bode's Galaxy

Bode's Galaxy lies in the constellation Ursa Major and is best placed in the evening sky around February. 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. It is a comfortable target for binoculars and small telescopes. 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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