Mystery

Perseid meteor shower to light up August night sky

This year the Perseid meteor shower reaches its peak on the night of 12-13 August, giving skywatchers a potentially impressive summer treat. The meteors are best viewed from the northern hemisphere, and in ideal conditions with no clouds observers could see up to 50 an hour.

Meteors are the result of small particles entering the Earth’s atmosphere at high speed, typically around 60 km per second. The pieces of debris heat up due to friction with the air, and are usually destroyed in under a second at altitudes above 80 km. The superheated air around the meteor glows briefly, and is visible from the ground as a streak of light known as a ‘shooting star’.

Throughout the year up to six random ‘sporadic’ meteors are visible each hour. During a shower, the Earth passes through a cloud of debris left behind by comets, and so many more meteors are seen entering the atmosphere. The Perseids are associated with Comet 109/P Swift-Tuttle, which last passed near the Earth in 1992. The shower meteors are named for the point in the sky where they appear to originate – the so-called ‘radiant’ – located in the constellation of Perseus.

This year the peak should be from the evening of 12 August through to the morning of 13 August (observers on the west coast of North America and the eastern Pacific Ocean are particularly well placed). The Moon will be a thin crescent rising not long before twilight begins, so moonlight will not interfere, and there is a real advantage to being in a dark sky site away from the lights of towns and cities.

In the evening the radiant is lower in the sky, so fewer meteors are seen. Those that do appear are ‘Earthgrazers’, where the incoming debris particles just skim the top of the Earth’s atmosphere and can leave long bright trails. Later on in the night numbers increase as the radiant rises higher in the sky, with the best view likely to be before 03:00 BST, when the sky will start to brighten before dawn.

Unlike many astronomical events, meteor showers are easy to watch and no special equipment is needed. A meteor shower is best observed with the nɑƙeɗ eye, and a reclining chair and a blanket make viewing much more comfortable. If clouds do make viewing impossible on the peak night itself, the shower will continue on subsequent nights with likely reduced activity. There remains the possibility of some later peaks as the Earth intersects filaments of debris.

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