The Perseids meteor shower

The Perseids are the people's meteor shower: warm August nights, dependable rates, and a rich supply of bright meteors with persistent trains. The parent, comet Swift-Tuttle, is the largest object that makes repeated close approaches to Earth, a 26-kilometer nucleus on a 133-year orbit.

Peak times and moonlight, 2027-2029

Peaks below are computed from the shower's solar longitude, the same way the professional calendars do it, not read off a fixed date. Moonlight makes or breaks a meteor year, so each peak carries its Moon verdict.

Watching the Perseids

Rates climb all evening as the radiant rises through Perseus in the northeast, and the best hours run from local midnight until dawn. Trace any meteor backward; if the line points to Perseus, it was a Perseid.

How to watch any meteor shower

No instrument beats your own eyes: binoculars and telescopes see too little sky. Get away from direct lights, lie back so you can watch a wide stretch of sky about halfway up, and give your eyes a full 20 minutes to adapt (no phone screens; red light if you need it). Meteors appear all over the sky, not just at the radiant, so face whichever direction is darkest for you.

What the ZHR really promises

Every shower is advertised by its ZHR, the zenithal hourly rate, and every year that number disappoints people who take it literally. The ZHR is a standardized laboratory figure: the rate one experienced observer would count under a perfectly dark sky (limiting magnitude 6.5) with the radiant directly overhead. Real skies are brighter, real radiants sit lower, and real eyes miss meteors.

A workable rule: from a genuinely dark rural sky with the radiant high, expect to see about half the ZHR. From a typical suburb, a quarter or less. That said, a single brilliant fireball can outweigh an hour of counting, and the showers on this page all earn their reputations in a dark sky.

Frequently asked questions

When do the Perseids peak in 2027?

CycleCalcs puts the computed peak at August 13, 2027, 08:00 UTC, with the shower active from about Jul 18 to Aug 25. Meteor peaks are broad enough that the nights on either side are usually worth watching too.

How many meteors will I actually see?

The headline ZHR of 100 is a standardized ideal, not a forecast. Under a truly dark sky with the radiant high, expect roughly half that; from a bright suburb, a quarter or less. Moonlight matters as much as anything: in 2027 the Moon is 86% lit at the peak (badly moonlit).

Where should I look to see the Perseids?

Everywhere: meteors streak across the whole sky. The radiant, the point their paths trace back to, lies in Perseus, but staring at it shows you the shortest trails. Watch a wide area of dark sky about halfway up, in whatever direction is darkest from your site.

What causes the Perseids?

Debris from comet 109P/Swift-Tuttle. Each August, Earth crosses the stream of particles this body has shed along its orbit; they hit the atmosphere at 59 kilometers per second and burn up as the streaks we see.

Keep exploring: all 13 major showers ranked for the year ahead, how meteor showers work from first principles, why the shower lands on nearly the same calendar dates every year, a rhythm set by the tropical year, and the Sky Map, which draws every active radiant on tonight's sky.

Showers either side of this one

Peak times and moonlight are computed with the same engine for every shower, so these are directly comparable.