Nepali Times
Star Gazing
August sky


KEDAR S BADU


July was quite something, wasn't it, with the 40th anniversary of the first moon landing and the most spectacular total solar eclipse of the century.

The highlights of August are the summer meteor shower and the grand-standing of Jupiter opposite to the sun throughout the night sky.

In the evening hours, you will see the 'Square of Pegasus' in the eastern horizon and the 'Great Summer Triangle' high in the east along the Milkyway band. The western sky will be kind of dull, but dominated by the Big Dipper (Saptarshi).

August brings the well-known Perseid meteor-shower: intense streaks of light across the night sky caused by small bits of interplanetary rock and debris called meteoroids as they crash and burn high in Earth's upper atmosphere. When a meteor appears, it seems to 'shoot' quickly across the sky with intense brightness that might make you think it is a falling star. Travelling at thousands of km an hour, meteoroids quickly ignite in searing friction of the atmosphere, 100 km above the ground. Almost all are destroyed in this process, the rare few that survive and hit the ground are known as meteorites.

Perseids seem to radiate from a point in the constellation of Perseus, which rises around mid-night and is high in the east by dawn. These meteors may be seen any time from late July to late August, but the peak this year is expected on the night of 12 August. However, there should be good numbers of meteors on the previous night (11 August), increasing in theory to one shooting star every two or three minutes towards dawn. Unfortunately, the gibbous Moon will be only 35 degrees to the right of the radiant point, and its light will tend to drown out all but the brightest meteors. To minimise the effect, try looking to the left of the radiant, at 90 degrees to the Moon.

Treat meteor watching like you observe the fireworks of the New Year. Select a dark location away from city lights. Binoculars are not necessary, your eyes will do just fine to enjoy the meteor mania.

Planets:
Mercury is at its greatest elongation east of the Sun on 24 August, but it sets only minutes after the Sun and we're unlikely to see this elusive little planet this month. Venus, in Gemini, could be seen as the brilliant "morning star" rising about three hours before the Sun. Although it is low in the twilight sky, Venus is so bright that it can be picked out easily.

Mars, located at the 'horns' of Taurus the Bull, is rising in the north-east around midnight and by dawn it's high in the east - well to the upper right of Venus, but much less bright.

Jupiter is at opposition (to the Sun) on 14 August, which means it rises as the sun sets and sets at sunrise, making it well positioned for observing throughout the night. The opposition will also bring Jupiter closer to us than during the rest of the year, due to which, even smaller telescopes (4-inch) could also reveal its colourful equatorial bands. But you would have needed a much bigger telescope to see the scare of a suspected comet collision last week.

At the start of August, it may still be possible to get a glimpse of Saturn very low in the western sky after sunset, but it sets earlier every night, and by the end of the month we will have lost sight of the Ringed Planet. It passes behind the Sun in the middle of September.

kedarbadu(at)gmail.com



LATEST ISSUE
638
(11 JAN 2013 - 17 JAN 2013)


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