Perseids

 ( July ) 

The Perseids are a prolific meteor shower associated with the comet Swift–Tuttle that are usually visible from mid-July to late-August. The meteoroid are called the Perseids because they appear from the general direction of the constellation Perseus and in more modern times have a radiant bordering on Cassiopeia and Camelopardalis.

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Etymology The name is derived from the word Perseids (), the sons of Perseus in Greek mythology.

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Characteristics The stream of debris is called the Perseid cloud and stretches along the orbit of the comet Swift–Tuttle. The cloud consists of particles ejected by the comet as it travels on its 133-year orbit. Most of the particles have been part of the cloud for around a thousand years. However, there is also a relatively young filament of dust in the stream that was pulled off the comet in 1865, which can give an early mini-peak the day before the maximum shower. The dimensions of the cloud in the vicinity of the Earth are estimated to be approximately 0.1 astronomical units (AU) across and 0.8 AU along the Earth's orbit, spread out by annual interactions with the Earth's gravity.

D.W. Hughes (1996). 9789401156523, Springer Science & Business Media. . ISBN 9789401156523

The shower is visible from mid-July each year, with the peak in activity between 9 and 14 August, depending on the particular location of the stream. During the peak, the rate of meteors reaches 60 or more per hour. They can be seen all across the sky; however, because of the shower's radiant in the constellation of Perseus, the Perseids are primarily visible in the Northern Hemisphere. As with many meteor showers the visible rate is greatest in the pre-dawn hours, since more meteoroids are scooped up by the side of the Earth moving forward into the stream, corresponding to local times between midnight and noon, as can be seen in the accompanying diagram. While many meteors arrive between dawn and noon, they are usually not visible due to daylight. Some can also be seen before midnight, often grazing the Earth's atmosphere to produce long bright trails and sometimes fireballs. Most Perseids burn up in the atmosphere while at heights above .

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Peak times

July 14 – Sep 01	August 13 08:00 UT (8% Waning Crescent Moon). Earth may have crossed the 69 BCE trail around August 14 02:00 UT. The New Moon is on Aug 16.
July 17 – August 24	August 12–13 (full moon on Aug 12)
July 17 – August 24	August 11–12 (ZHRmax 150)
2020	July 16 – August 23	August 12–13 (ZHRmax 100) (full moon on Aug 3)
2019	July 17 – August 24	August 12–13 (ZHRmax 80) (full moon on Aug 15)
2018	July 17 – August 24	August 11–13 (ZHRmax 60)
2017	July 17 – August 24	August 12
2016	July 17 – August 24	August 11–12 (ZHRmax 150)
2015	July 17 – August 24	August 12–13 (ZHRmax 95) (new moon on Aug 14)
2014	July 17 – August 24	August 13 (ZHRmax 68) (full moon on Aug 10)
2013	July 17 – August 24	August 12 (ZHRmax 109)
2012	July 17 – August 24	August 12 (ZHRmax 122)
2011	July 17 – August 24	August 12 (ZHRmax 58) (full moon on Aug 13)
2010	July 23 – August 24	August 12 (ZHRmax 142)
2009	July 14 – August 24	August 13 (ZHRmax 173) (The estimated peak was 173, but a lunar phase washed out fainter meteors.)
2008	July 25 – August 24	August 13 (ZHRmax 116)
2007	July 19 – August 25 Perseids 2007: first results	August 13 (ZHRmax 93)
2006		August 12/13 (ZHRmax 100)EAAS
2005		August 12 (ZHR max 90) 22jul_perseids2005 NASA.gov
2004		August 12 (ZHRmax >200)
1994		(ZHRmax >200)
1993		(ZHRmax 200–500)
1992		August 11 (outburst under a full moon on Aug 13)
1883	August 9 or earlier	August 11 (ZHRmax 43)
1864		(ZHRmax >100)
1863		(ZHRmax 109–215)
1861		(ZHRmax 78–102)
1858		(ZHRmax 37–88)
1839		(ZHRmax 165)

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Historical observations and associations Some Catholicism refer to the Perseids as the "tears of Saint Lawrence", suspended in the sky but returning to Earth once a year on August 10, the canonical date of that saint's martyrdom in 258 AD. The saint is said to have been burned alive on a gridiron. His manner of death is almost certainly the origin of the Mediterranean folk legend claiming that the shooting stars are the sparks of Saint Lawrence's martyrdom. The legend holds that during the night of August 9 to 10, cooled embers appear in the ground under plants; these embers are known as the "coal of Saint Lawrence." Falling stars and coal under the basil www.sanlorenzomaggiore.net The Coal of Saint Lawrence balbianblog.blogspot.it

The transition in favor of the Catholic saint and his feast day on August 10, moving away from pagan gods and their festivals — a process known as Christianization — was facilitated by the phonetic assonance of the Latin name Laurentius with Acca Larentia, a goddess previously celebrated during the summer period alongside Priapus, as a fertility deity. Among the Romans, it was believed that the trails of the Perseids represented the benevolent rain of Priapus' seed.

In this context, the god's cosmogonic phallus acted as a life-giver, blessing the fields and promoting fertility. During the same period, phallic processions and other sexual rites were common. Christianity, which had a different relationship with sexuality and generativity compared to Greco-Roman culture, replaced this sexual connotation with a reference to martyrdom.

In 1836 Adolphe Quetelet wrote: J'ai cru remarquer aussi une fréquence plus grande de ces météores au mois d'août (du 8 au 15) "I think I noticed also a greater frequency of these meteors in the month of August (from 8 to 15)." Annuaire de l'Observatoire Royal de Bruxelles, Volume 4, 1836, p272 (In French) After studying historical records, he predicted a peak on 10 August. He then wrote to other astronomers, who confirmed this prediction on the night of 10 August 1837. Quetelet missed the shower due to bad weather.Sauval, J., "Quetelet and the Discovery of the First Meteor Showers", WGN, Journal of the International Meteor Organization, {25} February 1997, pp 21-33

In 1866, after the perihelion passage of Swift-Tuttle in 1862, the Italian astronomer Giovanni Virginio Schiaparelli discovered the link between meteor showers and comets. The finding is contained in an exchange of letters with Angelo Secchi.

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In popular culture In his 2006 novel Against the Day, American novelist Thomas Pynchon refers to the Perseid meteor shower being watched by three characters west of the Dolores Valley after playing a game of tarot. In the TV series Curious George, season 7 episode 1b, George and his friends Allie and Bill hunt for the Perseids, which they believe are creatures that look like purses. At the end of the episode, Allie's grandfather Mr. Renkins says that the Perseids is a meteor shower happening in early August.

John Denver's song "Rocky Mountain High" references the showers with the lyric, "I've seen it raining fire in the sky."

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See also

• Leonids, associated with the comet Tempel–Tuttle
• Asteroid impact prediction
• Earth-grazing fireball
• List of asteroid close approaches to Earth
• Meteoroid

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General and cited references

• Littman, Mark, The Heavens on Fire: The Great Leonid Meteor Storms, Cambridge, Cambridge University Press, 1998. . Chapter 6, "The Discovery of the August Meteors", pp. 83–100.

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External links

• Where to see the Perseids and public stargazing events in the UK (Go Stargazing)
• Worldwide viewing times for the 2016 Perseids meteor shower
• How to see the Perseid meteor shower in 2024 (Paul Sutherland)
• How to photograph a meteor shower (Skymania)
• Perseid Observing Conditions (The International Project for Radio Meteor Observation)
• 2014 Perseids Radio results (RMOB)
• Perseid Visibility Map (2014 NASA Meteoroid Environment Office)
• 2009 Perseid Meteor Fireball
• NASA website on the Perseid shower of 2009
• Sky & Telescope Magazine – Perseids at Their Prime
• 2012 Image of Perseids emanating from the radiant
• What are the perseids?

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