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Caldwell 83
Hubble · Caldwell 83 · NASA, ESA, and H. Falcke (Max Planck Institute for Radio Astronomy); Processing: Gladys Kober (NASA/Catholic University of America)

Caldwell 83

Galaxy in Centaurus · 25.067 million light-years (est. from redshift)

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TypeGalaxy
ConstellationCentaurus
Right ascension13h 05m 27s
Declination−49° 28′
Object distance25.067 million light-years (est. from redshift)
Apparent magnitude11.9
Apparent size23.3′ (arc-minutes)
Approx. true diameter169,899 light-years across
Also known asC83 · NGC 4945
Caldwell 83 is a galaxy (NGC 4945) in the constellation Centaurus — a distant island of stars far beyond the Milky Way. It appears as number 83 in the Caldwell catalogue, Sir Patrick Moore's 1995 list of 109 bright deep-sky objects for amateur astronomers. It spans roughly 23.3 arc-minutes on the sky. At about magnitude 11.9, it is a fainter object best hunted with a moderate telescope under dark skies.

Although it appears about 23.3′ wide on the sky, its real span is roughly 169,899 light-years — the difference is a measure of how far away it lies.

Observing Caldwell 83

Caldwell 83 lies in the constellation Centaurus and is best placed in the evening sky around April. Its maximum altitude above the horizon depends on your latitude. It is best placed for observers in the southern hemisphere, and sits low for those far north. It is faint — plan for a moderate telescope and a dark, moonless sky. 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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