Perseids 2027
Meteor shower from 109P/Swift-Tuttle · up to 100 meteors per hour
Next peak (showing UTC)
- Active
- to
- Moon at peak
- 84% lit
- Speed
- 59 km/s
- Details
- Perseids 2027
Choose a location to see how high the radiant climbs from your city.
About the Perseids
The Perseids are caused by Earth crossing the trail of dust left by 109P/Swift-Tuttle. The meteors appear to stream from a point called the radiant, at right ascension 48° and declination 58°, and hit the atmosphere at about 59 km/s. The peak is defined by the Sun's ecliptic longitude of 140°, which is why the date shifts slightly from year to year.
The zenithal hourly rate of 100 assumes a perfectly dark sky with the radiant overhead. From most locations expect fewer, and far fewer if the Moon is bright. With a far-northern radiant this shower is best from mid-northern latitudes and poor from the southern hemisphere.