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| Two perseids meteors and their radiant (crossing of dotted line). Two star constellations are indicated. (Photo credit: Wikipedia) |
This week end will be a big one if the sky is clear at night. If it is it will be wonderful to watch as it always is. I remember the first time I saw this I was fishing on a river bank looking west and I was just perplexed to why there were just so many falling stars.
The Perseids are a prolific meteor shower associated with
the comet Swift-Tuttle. The Perseids are so-called because the point
from which they appear to come, called the radiant, lies in the
constellation Perseus. The name derives in part from the word Perseides, a term found in Greek mythology referring to the sons of
Perseus.
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| Dawning night sky from my back yard in Urunga. |
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 130-year orbit. Most of the
dust in the cloud today is around a thousand years old. However, there
is also a relatively young filament of dust in the stream that was
pulled off the comet in 1865. The rate of
meteors originating from this filament is much higher than for the older part of the stream.
The Perseid
meteor shower has been observed for about 2000 years, with the earliest information on this meteor shower coming from the Far East.
Some Catholics refer to the Perseids as the "tears of
St. Lawrence", since 10 August is the date of that saint's martyrdom.
The shower is visible from mid-July each year, with the peak in
activity being between August 9 and 14, 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, but because of
the path of Swift-Tuttle's orbit, Perseids are primarily visible in the
northern hemisphere.
As with all meteor showers, the rate is greatest in the pre-dawn hours,
since the side of the Earth nearest to turning into the sun scoops up
more meteors as the Earth moves through space. Most Perseids disappear
while at heights above 80 kilometres (50 mi).
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| The 2010 Perseids over the VLT (Photo credit: Wikipedia) |
In 2009, the estimated peak
Zenithal Hourly Rate was 173, but fainter meteors were washed out by a waning
gibbous moon.
Wiki.
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| Taking the trusty tripod to the cliff to Photograph the PERSEIDS this evening. |
Images @ Eminpee Fotography
