Explosive 'devil comet' 12P will soon be at its brightest and best. Here's how to see it before it disappears.

A "devil comet" is about to rear its icy green head over Earth — but you'll have to look soon to spot it.

On April 21, the 10.5-mile-wide (17 kilometers) Comet 12P/Pons-Brooks, also known as the "devil comet" or "Mother of Dragons comet," will reach its closest point to the sun — known as perihelion — during which it will be about 144 million miles (232 million km) from our star.

That position should make the comet significantly brighter and easier to see in the western sky just after sunset. However, at a magnitude of about 5.9, it may not be visible to the naked eye. (The lower the magnitude, the brighter the object; Sirius, the brightest star in Earth's night sky, shines at a magnitude of -1.46.)

That makes a good telescope, camera or decent pair of stargazing binoculars essential.

April 21 and a few nights before and after will be the best time to see the comet at its brightest. Observers in northern latitudes may struggle to see the comet because it will be positioned in the glow of sunset.

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Comets are typically at their brightest and easiest to see when they reach their closest point to Earth. That will happen in June, but by then, the comet's trajectory will mean it will be visible only from the Southern Hemisphere. In any case, true darkness is hard to come by in the Northern Hemisphere by early June.