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Caldwell 36
Hubble · Caldwell 36 · NASA, ESA, and S. Smartt (The Queen's University of Belfast); Processing: Gladys Kober (NASA/Catholic University of America)

Caldwell 36

Galaxy in Coma Berenices · 29 million light-years

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TypeGalaxy
ConstellationComa Berenices
Right ascension12h 35m 58s
Declination+27° 58′
Object distance29 million light-years
Apparent magnitude9.9
Apparent size10.6′ (arc-minutes)
Approx. true diameter89,419 light-years across
Also known asC36 · NGC 4559
Caldwell 36 is a galaxy (NGC 4559) in the constellation Coma Berenices — a distant island of stars far beyond the Milky Way. It appears as number 36 in the Caldwell catalogue, Sir Patrick Moore's 1995 list of 109 bright deep-sky objects for amateur astronomers. It spans roughly 10.6 arc-minutes on the sky. At about magnitude 9.9, it shows up in a small backyard telescope.

Although it appears about 10.6′ wide on the sky, its real span is roughly 89,419 light-years — the difference is a measure of how far away it lies.

Observing Caldwell 36

Caldwell 36 lies in the constellation Coma Berenices and is best placed in the evening sky around March. 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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