The month that takes its name from the Roman Emperor Augustus Caesar provides us with a prime opportunity to locate a celestial king. This and the small but sure monthly progression back to astronomical twilight (total nocturnal darkness) as the year marches on guarantee that the different items in AugustòÀÙs cosmic performance need not go amiss.
So to commence AugustòÀÙs trip to the constellations if we face in the direction of north and lift our eyes to the highest point in the sky above our heads we can find a special star pattern currently at the zenith. Although visually itòÀÙs quite a simple pattern to pick out from the starfield, itòÀÙs not a bad one to memorise as itòÀÙs also one of the rarer constellations which can be seen all year round, never dropping below EarthòÀÙs celestial season-changing horizon. The name of this elite group of constellations with which it shares this status, are the circumpolar constellations. Found within a small concentric ring of patterns endlessly rotating around the pole star, Cepheus the king can be drawn dot-to-dot style with your finger in the heavens rather like an upside-down childòÀÙs schema of a house, minus the chimney. As such this stick-figure shape uses up only the five brightest stars in the constellationòÀÙs patch of sky. Cepheus, king of Joppa (a city in Phoenicia, now known as Jaffa) was the domineered partner of the royal household, ordered about by his wife Queen Cassiopeia.
Looking North 15th August 11pm: With an equatorial grid showing the celestial sphereòÀÙs perceived axis of rotation around the pole star, the òÀØcircumpolar constellationòÀÙ of king Cepheus reigns from his imperious position in the heights of the heavens.
(Image credit: Stellarium/Nick Parke-click to enlarge)
Anyone looking for some free celestial entertainment should put 11-13August in their diary and look to the northeast as this is when one of the best meteor showers of the year takes place. Burning through EarthòÀÙs atmosphere from the direction of the constellation of Perseus, the Perseids showercould serve up as many as 100 shooting stars in an hour, (about one every minute or so). Although typically quite bright, they are still best spotted after midnight. However we may be assured that with a crescent Moon due to present only a minor luminal distraction at the time, and provided there is no cloud, the Perseids should have a level playing field for showing off their splendour in the heavens.
Where to look for the Perseids: the cosmic firework show that Perseus is throwing should really get going in his zone of the sky from 12am onwards.
(Click to enlarge, image credit: Stellarium/Nick Parke
Having already travelled the equivalent of at least 5000 Earth-Sun journeys (465 billion miles) from the òÀØcomet cold storage zoneòÀÙ or Oort cloud around the edges of the Solar System, the lump of ice and dust predicted to be òÀÜthe comet of the centuryòÀÝ, Comet ISON, is maintaining an unexpectedly low profile as it cruises towards our Sun. Although it has recently developed a small tail of dust and vaporised ice, C/2012 S1 ISONòÀÙs dim fuzzy form is only currently visible through the largest of telescopes. Our potentially spectacular visitor is now making its way from the constellation of Gemini down towards Cancer the crab, where its downward trajectory has most recently seen it sweep beneath GeminiòÀÙs brightest star Pollux.
Looking NE, 4:35am: Although still too far away from the Sun for it to reflect a sufficient quantity of sunlight for most of us to be able to find it, the best time for those keen to catch their first glimpse of Comet ISON will undoubtedly be in the morning before sunrise.
(Click to enlarge, image credit: Stellarium/Nick Parke
To continue our trip across the heavens, turn 90 degrees to your right and face that direction. This summer is not a great time for looking at the other planets in our Solar System. Two of the favourites, Jupiter and Mars will be out between 9-10am and therefore hidden behind the sunlight. That said, although 3.15am is not the most popular show time for planet viewing, the òÀØdie hard planetariansòÀÙ among us may recognise it as a great opportunity to try and see a highly reclusive planet and father to the king of the gods. Uranus, father of Jupiter (king of the planets) may be just about bright enough on this occasion to be seen with the naked eye, but failing that, a pair of binoculars should easily help you spot its ghostly form reflecting light from our star. Even if the planet appears small and dim, bear in mind that it is over 19 Earth-Sun distances (Astronomical Units) away from Earth, and where 1AU represents 150 000 000km, the fact that we can see Uranus at all is a tribute to its considerable size. To locate the gas giant look SSE halfway along the length of the constellation Pisces and a few degrees down.
A view of Uranus we would all like to see: Its washed-out monotone cloud-tops, its entourage of orbiting moons, and its enigmatic near-vertical ring system.
(Click to enlarge, image credit: Stellarium/Nick Parke)
With the Summer Triangle asterism still taking the prime position in the southern sky to show off its three bright stars, following on from our visit to Vega and Lyra in the top right hand corner last month, letòÀÙs now take a closer look at the constellation nearest the horizon.
An ancient star pattern mentioned as far back as 4th Century BC by Eudoxus, this is the constellation of the pet eagle that belonged to the king of the gods, Zeus. Often depicted as flying above a shepherd boy, according to Greek myth, Aquila, the eagle made from gold was ordered to kidnap Ganymede who was then brought to ZeusòÀÙ court to be his cupbearer. The pattern contains ten main stars, the brightest of which also forms the bottom point of the Summer Triangle asterism.
The brightest star in the bird constellation Aquila, called Altair, means the òÀÜthe flying eagleòÀÝ and lies only 17 light years away.
(Image credit: NASA/JPL/Caltech/Steve Golden)
For the moment we shall remain looking south, but now drop our eyes down beneath Aquila. Catering for the stargazers among us who like a challenge, our next weapon-bearing star pattern could well test your skills in tracking down a constellation. Viewed from a built up area, this stealthy archer may hide part or all of himself behind trees and rooftops, as even from the clearest skyline observation points little more than the top half of him can ever be spotted above the horizon. Perhaps in our first glance at an artistòÀÙs depiction we may think we see a man with a bow and arrow, but closer examination reveals an animal that does not belong to nature. Out of the 88 constellations surrounding our planet in space, Sagittarius, also a sign of the Zodiac, represents one of the colourful mythical creature constellations, for he is a òÀØcentauròÀÙ, half-man, half-horse. Dating back to Babylonian times and bearing the identity of Crotus the inventor of archery, his name was synonymous with a sharp eye and deadly aim. Six bright stars define his bow and arrow which actually point to the centre of the Milky Way galaxy.
From northern latitudes the most recognisable portion of the constellation of Sagittarius better resembles a stick figure òÀØteapotòÀÙ sitting precariously near the corner of some crooked cosmic table!
(Click to enlarge, image credit: Stellarium/Nick Parke)