For skywatchers August will be a busy month with a meteor shower and multiple planetary close encounters!
For early bird skywatchers the goddess of love, Venus dominates the dawn skies in the east perched firmly in the constellation of Gemini, the twins. The great white beacon rises nearly 3 and half hours before the sun every morning and through a small telescope appears like a miniature version of a quarter moon.
Look below Venus for its fainter companion Jupiter – the largest planet in the solar system – sits below nestled between the horns of Taurus the bull constellation. On August 11th the moon will form a celestial triangle with the jovian giant and the eye of the bull – the star Aldebaran. Two mdays later a razor thin crescent moon will park itself to the upper right of Venus.
Watch these two worlds closely and you will notice that while they have been hanging around each other for the past couple of months, the much speedier Venus will quickly increase the gap with Jupiter so that by the end of the month there will be 40 degrees apart.
On August 13 for those with telescopes, Venus will do a disappearing act as it slips behind the very upper portion of the crescent Moon during the daytime. Known as an occultation, this dramatic event however will be a real challenge to catch because it will be occurring in the late afternoon while luna sinks quickly in the low western horizon sky. The first hint of Venus creeping behind the moon will begin at 4:36pm and will take about 25 seconds to completely disappear. Since the moon will be only a few degrees in altitude (eastern N. America) your best bet to catch this event is to find a location that has a clear line of sight right down to the western horizon – like highway overpasses, hilltops and lakesides. Check out a listing of occulation times here.
But there is even more cosmic action in the evening skies. Look towards the west at nightfall for an impressive stellar grouping of the planets Mars, Saturn and the star Spica, in the constellation Virgo. Take note of the diverse colours of these three objects, with orange-hued Mars, yellowish Saturn and brilliant blue-white Spica. The most eye-catching aspect of this stellar trio will be watching them play musical chairs in the sky as they shift positions over the course of the month as they move along in their respective orbits around the Sun.
Then at dusk on August 21th the three objects form an equatorial triangle with the waxing crescent Moon just below.
Shooting Stars Galore
The big astronomical crowd pleaser this month however has to be the famous Perseid meteor shower. Peaking on the night of August 11th and into the early morning hours of August 12th, conditions promise to be good this year because there will only be a crescent moon rising after 1 am so minimal interference from its light is expected. You can expect up to 20 to 30 meteors per hour visible from suburbs and up to 60 from a dark sky.
You can expect about half that many the night before (Aug.10) and after (Aug.13). Best way to see the shower is to lie back on the ground or on reclining lawn chair facing the northeast sky with your naked-eyes. Most of these meteors are the size of a grain of sand and are travelling at about 150,000 km per hour, burning up at about 100 km above your head.
The Perseids get their name from the constellation Perseus – where the shooting stars seem to radiate from in the sky. The meteor shower originates from a cloud of particles in space that was shed by a comet that orbits the Sun. Every year at the same time of year, Earth slams into this cloud of debris, creating a cosmic shower in the heavens above.
BTW if the skies are clear and you are in Montreal area on August 11th, join me and the Royal Astronomical Society of Canada for a free Perseids star party at the Morgan Arboretum in Ste. Anne De Bellevue starting at 8pm with a lecture- rain/cloudy date is August 12th.
Tags: Mars, Saturn, Venus
Posted in Constellations, Planets, Solar System, Stargazing, The Moon, stars | Comments Off