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The Perseids one of the finest annual meteor showers peaks this year on the night of August 12th/13th. On this date up to 100 meteors per hour can be seen under perfect conditions. Unfortunately this year's spectacle will be greatly affected by the full Moon, which occurs on the same day. However, all is not lost since many Perseids can still be seen in the days leading up to the maximum, when the Moon won't interfere as much.

A Perseid flashes through the sky (Andreas Möller via wikimedia.org)

Discovery and Parent Body

The Perseids meteor shower is associated with comet 109P/Swift–Tuttle or as it's more often known comet Swift-Tuttle; a Halley-type object with an orbital period of 133 years. The Perseid cloud consists of particles ejected by the comet and stretches along the comet's orbit. It's believed that most of today's dust in the cloud is about 1000 years old, although some parts may be considerably younger. When the Earth passes through a replenished area the meteor rate is increased compared to the older part of the stream. Recent analysis by NASA has rated the Perseids as the best meteor shower when it comes to fireballs. The shower is also extremely reliable and rarely fails to deliver. Of all other annual showers only the December Geminids is comparable.

The Perseids were first recorded by Chinese observers in 36 AD with comet Swift-Tuttle independently discovered by Lewis Swift on July 16, 1862 and by Horace Parnell Tuttle on July 19, 1862. Computations of the orbit of the Perseids between 1864 and 1866 by Italian astronomer G. V. Schiaparelli revealed a very strong resemblance to the recently discovered comet and this was the first time a meteor shower had been positively identified with a comet. The years either side of perihelion, usually exhibit higher rates of Persieds meteors, as was the case during the last perihelion in 1992. Swift-Tuttle on this occasion was visible from Earth with binoculars.

Radiant

This meteor shower gets the name "Perseids" because it's radiant is located in the constellation Perseus. The radiant, the point in the sky where the meteors appear to originate from is positioned at right ascension (RA) 02hr 27m and declination (DEC) +58 degrees. This is close to the border with Cassiopeia and its well-known "W" shape asterism.

The meteors are visible from about July 17th to August 24th with rates starting low, gradually building up to the peak date, before falling off again afterwards. The shower is best seen from the northern hemisphere where the radiant appears high towards the northeastern part of the sky.

For those located in the southern hemisphere, the Perseid radiant is either very low down or even never climbs above the horizon. This considerably reduces the number of meteors likely to be seen, although it's possible to see a few meteors per hour coming up from the northern horizon.

Perseids Radiant and Star Chart

Perseids Radiant and Star Chart - pdf format

To spot as many Perseids as possible the best advice is the find a site with an unobstructed view of the sky. Then scan a large area of sky surrounding the radiant but not directly at the radiant. The reason is that even though the meteors originate from the radiant, they usually appear many tens of degrees in the sky from it.

Perseids Data Table 2014

Meteor shower namePerseids
Radiant constellationPerseus
ActivityJuly 17th -> August 24th
Peak DateAugust 12th/13th
RA (J2000)02hr 27m
DEC (J2000)+58d
Speed (km/s)59
ZHR 100
RatingBright
Parent body109P/Swift–Tuttle
NotesProlific meteor shower that was first recorded in 36 AD

Comet 109P/Swift–Tuttle Data Table (at epoch April 18, 2013)

Name109P/Swift–Tuttle
TypeComet
ClassificationHalley-type comet (NEO)
DiscovererLewis Swift / Horace Parnell Tuttle
Discovery dateJuly 16th, 1862
Aphelion (AU)51.2246
Perihelion (AU)0.95952
Orbital period (years)133.285
Last perihelion December 11th, 1992
Next perihelion March 26th, 2126
NotesAlso known as Comet Swift-Tuttle