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Caldwell 45
Hubble · Caldwell 45 · NASA, ESA, J. Lee (California Institute of Technology), and A. Filippenko (University of California – Berkeley); Processing: Gladys Kober (NASA/Catholic University of America)

Caldwell 45

Galaxy in Boötes · 53.583 million light-years (est. from redshift)

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TypeGalaxy
ConstellationBoötes
Right ascension13h 37m 32s
Declination+8° 53′
Object distance53.583 million light-years (est. from redshift)
Apparent magnitude10
Apparent size4.1′ (arc-minutes)
Approx. true diameter63,905 light-years across
Also known asC45 · NGC 5248
Caldwell 45 is a galaxy (NGC 5248) in the constellation Boötes — a distant island of stars far beyond the Milky Way. It appears as number 45 in the Caldwell catalogue, Sir Patrick Moore's 1995 list of 109 bright deep-sky objects for amateur astronomers. It spans roughly 4.1 arc-minutes on the sky. At about magnitude 10, it shows up in a small backyard telescope.

Although it appears about 4.1′ wide on the sky, its real span is roughly 63,905 light-years — the difference is a measure of how far away it lies.

Observing Caldwell 45

Caldwell 45 lies in the constellation Boötes and is best placed in the evening sky around April. Its maximum altitude above the horizon depends on your latitude. Lying near the celestial equator, it can be seen from both hemispheres. 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.

See Caldwell 45 in Universe Finder

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Sources

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