What’s Up for August 2019

It’s August and holiday time.  With luck you’ll be able to get away to place with a darker sky than you’re used to, or at least stay up a bit to make the most of whatever you’ve got. It gets dark a bit earlier than in July, as well. And for once you won’t get frostbite. But how do you make sense of all those stars?

That’s where we come in. Use our easy-to-follow sky guide and you’ll be out there stargazing in no time. You will need a star map, and you will need to know how it works. This may seem obvious, but there is a knack to understanding these things. Here’s our map for this month:

Wrong way round?

Now don’t write in and tell us that we have the points of the compass all wrong. This is a map of the sky, so you have to hold it over your head. When you do this, east and west will be the right way round.

It shows the whole sky, so the scale is quite small. Normally you turn to see different parts of it, so to see the view looking north, for example, hold the map upside down with north at the bottom.

The map shows the sky in mid August at about 10.30 pm, at the start of the month at 11.30 pm, or by the end of the month at 9.30 pm. All times are BST.

TIP If you aren’t sure of the direction of north from your location, click here for a page on Getting Your Bearings.

Making sense of the stars

This being summer, the best way to find your way around the sky is to use the Summer Triangle. Actually this is not as obvious as it seems, because this triangle still remains visible well into the autumn and even the winter, but the fact is that it’s a key feature of the summer skies so we might as well stick with the name.

Find it by looking right overhead to find a really bright white star, Vega. It’s the only bright star close to being overhead, so ignore all other stars and look really high up. The next star of the triangle, Altair, is halfway between Vega and the horizon. Altair has a fainter star on either side of it – look at the map to get the idea. The other star is Deneb, which is a bit lower down towards the eastern horizon than Vega. If you can’t spot these three stars straight away, remember that the map above is on quite a small scale, so think big and you should spot it.

Many people recognise The Plough, which if you want to get your bearings is over in the northwest. We’ve picked it out on the map. If you think of the Plough as a saucepan, then follow its handle round towards the horizon, you come to a bright star called Arcturus, which is about the same brightness as Vega but low down in the western sky. It’s also slightly yellowish, and if you thought all stars were white, compare it with Vega to see the difference.

Now use the map below to find more patterns nearby, but don’t expect to see those convenient lines helping you to see the patterns. If you do see them, clean your glasses.

All maps produced using Stellarium software.

Other constellations to look for

Once you have found the Summer Triangle, you can now start to look for some constellations. There’s Cygnus, the Swan, also known as the Northern Cross. It is a large cross-shape with Deneb at the top, marking the tail of the swan which flies down the Milky Way with outstretched wings. Fair point. You live in Neasden or Newcastle and can’t see this Milky Way which is shown on the map. You’ll just have to take our word for it that it’s there.

To find out more about Cygnus, including why it is unsuitable for children, click here.  One of the best-known stars in Cygnus is Albireo, a fairly faint star marking the head of the Swan, or the foot of the Cross.  Midway between Altair and Albireo is a rather cute constellation called Sagitta, which means Arrow. Use this to find some other interesting objects, and the constellation of Vulpecula, by clicking here.

This is the time of year to look way down on the southern horizon for the constellation Sagittarius, which form a sort of teapot shape, and this year Saturn is right above the teapot shape to help you find it. Not that it’s been put there just for you, of course. But unless you have a good, clear night and are well away from city lights, you might not see the stars of Sagittarius at all well.

There are plenty of nebulae and clusters visible with binoculars in this part of the sky, so check out our guide to them.

To the left of Vega is Hercules, whose most obvious feature is a parallelogram of stars called the Keystone, though it isn’t particularly bright.

The map shows the Milky Way as a pale band crossing the sky. This is a good time of year to look for it, though you won’t see it from light-polluted areas. The best chance of seeing it is high up in Cygnus, but if you go on holiday to a dark-sky area it can appear so bright you will wonder why you can’t see it at home.

If you want a map with all the constellation names on it, click here.

The month’s planets

There are two bright planets in the evening sky. Jupiter is quite low down over in the south-west, and really bright. Saturn is also easy to spot, though not nearly as bright, in the south, to the left of Jupiter.

Saturn photographed through a 130 mm Sky-Watcher reflecting telescope on 23 July 2019. Photo: Robin Scagell

So you want to see Saturn’s famous rings, eh? Well, the good news is that even a small telescope will show them – you don’t need anything expensive. By ‘small’ we mean something that will magnify maybe 40 or 50 times. Actually, even a larger telescope won’t show very much more this year because Saturn is quite low in the sky and our atmosphere makes a real mess of the image, causing it to shimmer and shake like it’s made of jelly. But even so, you can still see the rings, and you might be lucky enough to get a steady night, so it’s worth a try. The photo at right shows what you could see through a popular budget telescope.

Every August for many years tales have surfaced on the web that Mars is looking really big. If you’ve seen such a story this year, unfortunately you’ve fallen for clickbait. It’s not true. Check out our own page on the Mars hoax. Mars is actually almost right behind the Sun at the moment and impossible to see. Venus is also in line with the Sun. The good news is that Mercury is well-placed for viewing. And the bad news is that you’ll have to be up at 5 am to see it, low down over in the north-east, in the twilight sky rising before the Sun. It looks just like a bright star. There are other bright stars around that are about the same brightness, but they are more to the south-east.

Where’s the Moon, then?

At the very start of the month the Moon is too close to the Sun to be seen, and New Moon is on the 1st, when it’s in line with the Sun and you can’t see it at all. You might just see the crescent Moon low down in the western twilight on the 2nd about 30 minutes after sunset, but it’ll be easier to see on the 3rd. There’s first quarter on the 19th, then full Moon is on the 15th. The month ends with last quarter on the 23rd. Sorry, no eclipses this month.

We have a whole section of the website devoted to the Moon and its features.

Two Perseid meteors, photographed in 2010

August’s shooting stars

August is a great month for watching shooting stars – what astronomers call meteors. You can expect one every ten minutes or so on most nights, as long as you have a fairly dark sky. Around Saturday 12 August we get the annual Perseid meteors, which are one of the year’s strongest showers. But look at the previous paragraph, and you’ll see that the Moon is almost full on that date. It’ll make the sky quite bright, so only the brighter meteors will be visible. Even so, you might fancy staying up late lying out in the garden gazing upwards, and you could see a few. It’s not worth looking until about 10:30 om, though, as the sky doesn’t get dark enough until then.

The Perseids don’t just appear in Perseus (which is shown on our map at the top) but can appear anywhere in the sky. They appear to come from the direction of Perseus in the north-east, though the trails will be rather short in that direction so don’t concentrate your attention there. Keep the Moon out of your field of vision as well.

You may hear that there could be 80 an hour visible, but don’t take that too seriously. That’s a theoretical number based on perfect conditions, which certainly won’t apply this year. You might see one every few minutes, although there are sometimes bursts of activity.

You can find out a lot more about what to do when you see one in our guide to observing meteors. And there’s a 35-minute video (recorded in 2013) telling you all you need to know about observing the Perseid meteors.

Get more helpful info

OK, you’ve read all this for nothing, now comes the plug. This page is brought to you by the Society for Popular Astronomy, which is a really great society to join. It’s based in the UK but there are members in other countries as well. It doesn’t cost much to join, and there is a special rate for Young Stargazers. At least take a look at what we have to offer.
Text by Robin Scagell