It’s been a quiet season for us at the observatory, feeling strange not to open our doors every week to welcome in visitors to gaze on our Scilly skies. As I’ve written previously, we made the decision as a committee of volunteers to remain closed to the public this season, as it was clear that physical distancing within the site wasn’t possible.
If there’s any consolation for would-be visitors who missed out on a trip during the summer holidays, then it’s cloud! I can count on one hand the nights of good seeing we’ve had on St Martin’s during August. The peak of the annual Perseid meteor shower – a veritable light show in our dark skies – happened behind a sheet of cloud. Perhaps it’s payback for the fabulously clear skies we had in June and July. These made for some photographic beauties of Comet Neowise. (See the corker of a shot by James Faulconbridge, one of the new owners of the vineyard here on St Martin’s, turning the Daymark into a giant Roman candle!)
Shifting from Summer into Autumn always fills us astronomy folk with gleeful anticipation, as the nights draw in and the astronomy ‘season’ starts in earnest. On St Martin’s we’re sticking with naked eye astronomy for now, though I’ll update you with news as to our reopening plans as and when.
Ideally, this is the perfect time of year for gazing with nothing more than a pair of binoculars. If you’re after a rewarding area of sky to explore, look no further than the area between summer triangle constellations Cygnus and Vega. There are several open clusters of stars that you’ll pick up with a pair of binoculars, plus beautiful double star Albireo – with small magnification you can pick up the stunning contrast between its yellow and blue stars. Start off on Stellarium before heading out, or just lean back and scan the sky and see what you can find!
Looking East, Mars is now lovely and bright as it rises after darkness falls. It’s known as the red planet but really rather more… salmon paste (at least to me! See what you think). The surface of Mars is rich in iron oxide, our rusty neighbour. Who will get there next?
It’s also a super month for conjunctions – objects coming together in the night sky. The Moon and Mars get close and personal at the start of the month in the wee small hours, followed by Saturn and Jupiter floating above the waning Moon, at the slightly friendlier time of about 8pm, as September draws to a close.
As we face yet more uncertainty to come, I find myself returning to the certainty of vastness inherent in astronomy. While we might be one tiny blue dot in a vast universe, there’s hope in Carl Sagan’s famous words, ‘somewhere, something incredible is waiting to be known’. Wherever you are and whatever you’re doing, we hope you can find some wonder in your night sky.
If there’s been one constant over the uncertain last few months, then it’s our beautiful night sky. There’s something timelessly reassuring – and vast – about astronomy that makes it a perfect lockdown tonic. Our Sun’s nearest star – Proxima Centauri – is just over 4 light years away. Nothing travels faster than light. 4 years travelling at the speed of light equates to a mere 24 trillion miles or so (St Martin’s, in comparison, is a dinky 1.5 miles long… or so).
We’ve been lucky to have enjoyed some stunningly clear Scilly nights here over the last few months. We’ve all been following government guidance about avoiding public gatherings, so there have been no observatory meetings. Astronomy – in our community – is a friendly and collaborative pursuit. There’s something special about joining with others to wonder at our night sky together. It’s worth remembering that without this shared joy, and collective effort, we wouldn’t have an observatory to begin with!
At this time of year, Scilly stargazing is for certified night owls. We’re in the lightest part of the year so you need to be up pretty (very) late to get a good look-in. That said, pre-dawn skies are particularly rewarding. My teething 9-month-old must be a born sky-watcher! We’ve witnessed several beautiful conjunctions of Jupiter and Saturn due south east.
In the late night sky, from darkness onwards, try to locate the Summer Triangle – three bright stars – Altair, Deneb and Vega, each of which is the brightest star of its constellation (Aquila, Cygnus and Lyra, respectively). Tilt your head back and look straight up for that one – 11pm onwards.
We’re glad that visitors are able to return and appreciate these wonderful skies with us. However, the St Martin’s Observatory won’t be open to the public for the 2020 season. Our Tuesday evening and Friday afternoon sessions will resume in 2021.
Using a telescope under guidance is a close-proximity activity. It's not possible to maintain physical distance within the warm room or domes, and therefore we're not currently able to guarantee a safe experience for our visitors or our volunteer team.
The good news is that our Scilly skies are still just as pristine and the nights - if shorter - are still wondrously dark! We'll endeavour to post regular updates about what you can see in the Scilly night sky – please join our Facebook page (type in ‘COSMOS Scilly’ and we’ll be there).
We can't wait to welcome you back to the Observatory soon. Keep well, and keep looking up. And as challenging as 2020 has been so far, don’t forget - without the dark, we’d never see the stars.
A version of this article appears in Scilly Now & Then magazine's March/April 2020 edition.
Spring is on its way! Clouds begone! You don’t need to have a brain the size of Stephen Hawking’s to know that clouds plus stargazing equals zero. I won’t go on (again) about the weather; a let-up will be welcome.
One rare but utterly lovely clear night last month, a group of us ventured up to the observatory, as naturally we are wont to do when the opportunity arises. Partly this was administrative: I’d had word that our smaller telescope was playing up and wouldn’t point where it was supposed to. If a go-to telescope doesn’t go-to where it’s supposed to go to, it’s a) a problem and b) annoying. You can’t easily solve alignment issues during the daytime when you’d like to, nor on a cloudy night as you need to be able to actually see to verify the celestial objects you’re supposed to be looking at. None of us that night wanted to tinker, we wanted to be wowed. And gladly there ends the non-anecdote, as said telescope was fully functional. Nothing is ever perfect in our corner of amateur astronomy (we're all learning rapidly), but workable is a huge relief. In any case, after being underwhelmed by bright Venus (it’s so bright that, even with a filter, magnification doesn’t add much), we set our sights on some lovely deep sky objects, including our nearest galaxy, Andromeda.
A galaxy is - to cut a long story short - a big old group of stars bound together by gravity. Think of them as cosmic super-factories, creating on a grand scale. Ours is the Milky Way, comprising some 250 billion stars, our Sun one of the distinctly average thereof. But the Milky Way is only the second-largest in a cluster of some 50 other galaxies known as the Local Group. I say group, we’re pretty far apart. Andromeda’s the nearest to us and that’s a tidy 2.5 million light years away from Earth. (That would be approximately 23,651,826,000,000,000,000 km... to ground you, a walk around the entire coast path on St Martin's comes in at less than 10km.) The whole of the Local Group spans about 10 million light years across (don't make me write it). There’s nothing like astronomy to put you in your place!
There’s a particularly interesting patch of sky on view right now, known as the Realm of Galaxies, less fantastically as the Coma/Virgo Supercluster. It’s the galactic heartland of the Local Group, and now is a very good time to go on that deep sky tour you’ve always fancied. Sadly you won’t see galaxies with the naked eye – you’ll need a decent-sized telescope.
Located between constellations Virgo and Coma Berenices, you’ll find this richly populated region in the Eastern sky after 10pm. Locate Spica, Virgo’s brightest and distinctly blue-hued; to its left find Bootes’ brightest, orangey Arcturus (incidentally an ageing 7.1bn old red supergiant). Join a line between the two and then imagine a point forming the tip of an equilateral triangle above – this points to the area of the Realm of Galaxies. If you don’t have a telescope, you’ll just have to make do with imagining the many worlds out there. Still: humbling.
If you’d like to join us (and our telescopes), the observatory on St Martin’s is open again from April. Regular openings are Tuesday nights, 8-10pm, and Friday afternoons, 2-4pm. We recommend booking in advance so email firstname.lastname@example.org if you’d like to come along.
This article originally appeared in Scilly Now & Then magazine's February 2020 edition.
I would say a belated Happy New Year, but so far 2020 brings little let-up in cloudy night skies. It’s fair to say that this winter’s been pretty dismal for stargazing on Scilly! We can only hope for more clement Spring skies as we’re all itching to get the telescopes pointing up, up and away.
Cold comfort, then, that clear night skies reveal such jewels at this time of year. The rich fabric of sky has some corking treats for stargazers of all abilities. Orion, Auriga, Gemini, Taurus…the Pleiaides: what we lack in visible planets, we gain in some tantalisingly easy-to-identify constellations. (That is unless they’re all wondrously hidden by a layer of dense cloud.)
Ever the optimists however, we Scilly stargazers seize every fleetingly clear moment and are, as always, rewarded for our efforts. You don’t even need to stay up too late!
Stunningly bright planet Venus graces our evening skies in the early part of 2020; spy the south-western sky from dusk until about 2 hours after sundown. Ancient civilisations knew Venus as the morning star or evening star – so dazzling is she and only ever visible either just to the side of sunset and sunrise, and the brightest object in the night sky after only the Sun and the Moon.
Not a star at all, Venus is in fact, in proportion, remarkably similar to our Earth. It’s thought that once (a mere billion or few years ago) she may have had a climate similar to ours. Named after the Roman goddess of love and beauty (and as an aside – the only planet named after a female), alas she is anything but lovely. Venus’ world is a could-be cautionary tale of global warming gone mad. Her atmosphere is made up of 96.5% carbon dioxide and temperatures average a toasty 462 degrees Celsius, making her the hottest planet in the solar system, despite not being closest to the Sun. Add to this that standing on Venus would be the equivalent in pressure to being 1000km underwater on Earth. So inhospitable is Venus that we know very little about her – most missions have overheated and the longest surface landing lasted less than 24 hours before the craft failed. Let’s admire this ‘beautiful’ planet from afar and let her give us impetus to protect our own Earth’s climate before it’s too late.
2020 is another exciting year for the COSMOS team, our second year of opening regularly to the public and welcoming more new and returning visitors. St Martin’s is also hosting the inaugural Scilly Dark Skies Week in October this year – which will be packed with special talks, workshops, island events and guided stargazing. If you’ve never visited in October, we can’t give you more encouragement than this! We’d love you to join us; Click here for more information.
This article originally appeared in Scilly Now & Then magazine's December 2019 edition.
2019 will go down in history as the year St Martin’s finally got its observatory! We’re very proud of this achievement and continue to be overwhelmed by the support we receive. Thank you. From our first trickle of guests in April this year, to jam-packed nights through July and August, more than 800 people have visited us and – hopefully – come away better informed about Scilly’s beautiful dark skies and enthused about astronomy.
Highlights of our year included: gazing upon gas giants Jupiter and Saturn in the Summer months; entertaining talks by visiting astronomers Mark Holmes and Ian Morison; watching the transit of Mercury across the Sun; and did I mention…more than 800 wonderful visitors! If you were one of them, again, thank you! Lowlights included our state-of-the-art 14 inch Meade telescope needing replacement due to a faulty go-to mechanism and rather too many nights of thick cloudy sky. Of course we expected to have teething issues and the good news is the big Meade is now functional; the bad news is that we’re still waiting as I write for a decent run of clear sky to get it fully calibrated!
2020 is going to be another exciting year for us, as we’ll be open again for the season in April, and welcome even more people to experience our dark skies. We’re also planning our inaugural Dark Skies Week in October 2020, a week of astronomy-related activity with visiting speakers, special events and lots of stargazing. We hope to see you on St Martin’s!
Finally, tis the season for a bit of gifting. We’re frequently asked advice on buying telescopes. But it’s a bit like buying a car: depends how much you’ll use it and how far you need to go. Probably the very first question you should ask yourself is (if it’s not ‘where’s my nearest observatory and how do I join?’): ‘could I get more out of a good book or a pair of binoculars first?’
If you’re determined to buy a telescope for yourself or a loved one this Christmas, it’s wise to do a bit of research before you splash out. There are many different types available. Manual starter scopes come with a cheaper price tag but can take a bit of time to get your head around – absolutely worthwhile if you’re serious about learning the basic mechanics of how telescopes work and the layout of the night sky. You’ll need to invest time and use it regularly but this will give you an excellent grounding in observing. If that doesn’t sound realistic, you may end up with something that fills a cupboard but not your free time.
The alternative is investing a bit more and going for a scope with a go-to motor, essentially astronomy by numbers: type in what you want to look at, and your scope points at it. What you gain in press-of-a-button convenience, you risk losing in acquisition of basic skills. And you still need to know what you’re supposed to be looking at, regardless of any automation!
May the festive season bring you happiness, and plenty of dark, clear skies.
Hello again from the Observatory on St Martin’s. It’s been a little longer than usual since my last update on the night sky. The reason for that is the arrival of our baby, whom we’ve called Teddy, a month early! He was born just before the New Moon in September, so the astronomer in me would like to think he knew it was the right time to get out there and stargaze. In any case, in honour of Teddy, I thought I’d talk about the other little bear in my life, the one in the sky: Ursa Minor.
We will be more familiar with Ursa Major, the great bear, and especially the main pattern within it that’s nicknamed the Plough. Or the big dipper in the USr , or – my preferred – the saucepan, in France. Visible all year, Ursa Major is one of the Northern Hemisphere’s great waymarkers of the sky. It’s what’s called a ‘circumpolar constellation’, meaning it rotates round the northern celestial pole. In practicality, that means its place in the sky changes throughout the year – it won’t always look the same way up! It’s a really good one to make yourself familiar with – find one familiar constellation and you will soon begin to learn many more.
Located within a celestial stone’s throw of the Plough is Ursa Minor, the small bear, also known as the little dipper. Its alpha star, Polaris, gives Ursa Minor its importance, because it’s actually a fairly faint constellation in the grand scheme of things. Polaris is the North Star, or Pole Star, so known because it’s located within one degree of the celestial North Pole. This makes it a very good one for navigating by the stars.
Because it’s so well known, many expect the Pole Star to be brighter than it is. It’s actually only a magnitude 2 star (less bright than the three brightest stars in the Plough). Polaris is, we reckon, 680 light years from us and 6000 times as bright luminous as the Sun. (So actually, that makes it very bright indeed, we’re just quite far away!)
You can find Polaris by extending your gaze up past the 2 right hand side of the plough by 5 times the distance between those 2 stars. Polaris forms the tail of the little bear. The pattern of Ursa Minor looks like a slightly dim and distorted back-to-front version of the Plough.
The other notable star in the constellation is Kochab, at the other end of Ursa Minor to Polaris. Kochab’s got a nice orangey colour, which makes it a good contrast with more white-looking Polaris. Have a go with the naked eye and see if you can become as familiar locating the little bear as its big neighbour.
The Observatory on St Martin’s is now closed for the season – our Tuesday night and Friday afternoon open sessions will be back in April. That said, if you’re on the island and would like to drop in, do get in touch and if we’re around we’ll be happy to open up for you. Otherwise, we’re taking this Winter to get more familiar with the kit and hopefully to get lots more super dark sky images to share with you. Watch this space, as they say!
Autumn is a welcome time for us stargazers as the longer nights offer more opportunities for enjoying Scilly’s stunning skies. What’s more, as our climate retains that little bit of extra warmth as the nights draw in, we look forward to some toasty evenings up at the observatory without too many added layers! And if we do get chilly, we can retreat to our cosy warm room. We can even operate our largest telescope, the 14 inch Meade, from the computer in there! Not that anything quite beats looking at some of our skies’ wonders with our own eyes, direct from the eyepiece.
It’s been a brilliant summer for us in several ways. In our first 6 months, we’ve welcomed nearly 700 visitors. We’ve had some heart-warming feedback about both what we’ve achieved and our enthusiasm. It has been terrific showing off the observatory to visitors of all ages and giving some visitors their own astronomy ‘wow’ moments, hopefully which will inspire them to pursue this most rewarding of hobbies.
We always talk to our visitors about what makes Scilly’s skies unique, our chief attribute being complete lack of light pollution. We want people to understand what this means and why we’re in the dwindling 21% of the UK that still has pristine night skies!
We have had some terrific evenings of observing with still, clear nights, and have cast our telescopes on not just star clusters and planets, but distant nebulae and galaxies.
As we get further into autumn and winter, the last of the summer constellations drop out of view and new ones appear. Now is a great time to catch the rich heart of our Milky Way at its best. Constellation Cygnus, the swan, which can be reduced to the Northern Cross, lies smack bang across the Milky Way and offers a rich area of observing. Gorgeous ringed Saturn will still be viewable in much of September up until November in fact, albeit very low in the southern sky; and giant Jupiter’s hanging around our early evening skies. Both are magical seen through our observatory’s telescopes – reality sometimes is more wondrous than you can imagine!
While we’re open until the end of October, with our first ‘season’ under our belts, we can now look back – and forward – to think about what we might do differently next year. Opening twice a week has worked well for us, with sell-out Tuesday nights and more informal Friday afternoons for drop-in tours and sun-gazing. While we’d like to be open more, we’re still a small team of dedicated volunteers (though in the longer term, there’s potential for a paid job there!). It’s still the case that visitors not staying on St Martin’s need to arrange their own transport to us, which poses issues due to the inevitable night boating: but this is island life. There’s also my previous point about peak season on Scilly not being the optimum time for stargazing – we could put on extra dates but it wouldn’t get dark any earlier, nor could we guarantee clear weather.
You’ve got until the end of October to pay us a visit in person. Then it’s our chance as a team and an island community, over our first Winter with our kit all up and running, to have a good play and build our working knowledge. One of the best things, however, about astronomy, and indeed running a community observatory, is that you can never know it all!
A version of this piece was originally broadcast on Radio Scilly in September 2019.
September is well and truly upon us and for us eager astronomers, this month marks the beginning of the new stargazing season (...handily, just as the tourist season on Scilly winds down and things get that bit quieter – less haring about between multiple jobs and still squeezing in open nights at the observatory!).
That ‘start of the stargazing season’ is less to do with what’s up in the sky but more that we’ve now hit meteorological autumn and the nights are getting longer: and you know what that means: more time for observing! In terms of what’s up there to look at, nothing’s massively changed since last month. Just that we can now see it by 9pm, cloud permitting.
I say the sky is much darker now, but for the next week and a bit, the very bright Moon, which is rising in the evenings, presents a bit of a pain – certainly when for looking at deep sky objects or indeed anything more than planets! – it can wash out all but the brightest stars up there. The Milky Way will also be less visible with the naked eye. The full Moon peaks on 14 September. While this means we can leave torches at home if we’re off out late, we’re really going to have to wait until after the last quarter, on 22 September, to appreciate the richness of the month’s skies. Nothing to stop you having a good old look at the Moon: Patrick Moore would approve, and you don’t really need anything more than binoculars for this. Proper astronomers – by the way I’m not counting myself in this category here! – will tell you that full Moon is the worst possible time to look at the Moon through a telescope, particularly if you want to look in geographical detail at the seas and craters, because it’s just too bright! They’ve got a point, but it depends what floats your boat. Amateurs like us at COSMOS will gladly say pooh to that: we’ll be happy to point our telescopes at the Moon whenever it’s big and bright. I for one quite like the aesthetic satisfaction of seeing the whole disc through the eyepiece in all its glory.
As we inch further into autumn and winter, the last of the summer constellations drop out of view and new ones appear; this is particularly the case in the hours before dawn. At 7 and a half month’s pregnant, I’m frequently up and down in the night, and I make the most of this joy (!) by popping my head out of the window to see what’s out there! If you’re also up into the wee small hours, you’ll notice Taurus (the Bull) is back with its clusters of the Hyades and the distinctive smudge of the Pleiades. This is part of my favourite patch of sky which also features stick men twins Gemini and, below them, multicoloured Orion. These will get higher in the sky earlier as the months progress towards the end of the year.
Gorgeous ringed Saturn will still be viewable in much of September - up until November in fact – albeit very low in the southern sky, not an issue for us sea-locked islanders whereas it would be if you lived in a built up area; and giant Jupiter’s hanging around our early evening skies. After the Moon, Jupiter’s the brightest thing in the sky at the moment. Nearby Saturn will appear dimmer, and more orange-y, but will be viewable before its nearby stars. If you're unsure what you're looking at, it’s a good time to refresh your knowledge on a stargazing app on your computer or phone – Stellarium is our go-to on PC; I use Star Walk 2 on my phone, but others are available.
We’ve welcomed more than 700 people to the observatory since April, which we’re very pleased with for our first ‘Scilly season’, and we’ve got lots to think about for next year – more on that later. We’re relishing the chance to get some decent stargazing sessions in as a team over the Winter, this is now our chance to get to know the kit a lot better, so as best to show it off to you! Anyway, you’ve got until the end of October to join us on St Martin’s in person, more details on our website. Tuesday evenings fill up fast so you must book ahead, and Friday afternoons offer a good point to drop in for a look around if you’re passing, or staying on another island.
That’s all for now: I’ll be back in a couple of weeks, when the new Moon means we’ll have some darker starry skies to explore.
A version of this piece was originally broadcast on Radio Scilly in August 2019.
We’ve had some delightful evenings stargazing in the last couple of weeks, with relatively cloudfree skies – and a late-rising Moon – meaning that between 9.30pm and 11.30pm (ish) there’s been a nice window for observing. By that I mean before the very bright Moon pops up and wipes out all but the brighter stars up there.
At this time of year the Milky Way arcs brightly across our sky. It’s something many visitors to Scilly come to marvel at and appreciate, thanks to our naturally dark skies here. It must be stressed that you need dark minimal light pollution to stand a chance of seeing it clearly, which wipes out much of the mainland! Indeed a recent report by the Campaign for Rural England warned that many children in the UK risk growing up never seeing the Milky Way, because of the damaging effect of artificial light on the night sky. Unless they live in rural areas, and that’s a real deprivation.
One sad fact is that England has only 21.7% of pristine, unpolluted sky left (even sadder is that most of these areas are sparsely or unpopulated – so go figure what the cause is).
Anyway, we treasure our dark sky here in Scilly and long may our nights gazing at the Milky Way continue. But what is the Milky Way and what are we seeing when we look at it?
The Milky Way is the galaxy that our Sun, and therefore our solar system, belongs to. In fact, all the individual stars we can see in our night sky are part of the same galaxy, the same Milky Way.
A galaxy is a group of stars, gas, dust, remains of stars, and dark matter, bound together by gravity. There are several different types of galaxy, named by shape. The Milky Way is a spiral galaxy, which means it resembles…a spiral. Following so far? Our Milky Way is somewhere between 150,000 and 200,000 light years across. So, very big then. You might at this stage be wondering how on earth we know all this. And the answer is, very clever guess work, scientific estimations – based on other spiral galaxies in space and observations of patterns of behaviour of the stars we can see. If you’re still doubting, you’ll have to take my word for it.
We are inside the galaxy, and as such we’ll never be able to see ALL of the stars in it. What we can see is a disk of stars that forms the Milky Way from inside the disk, which tells us that our galaxy is basically flat… but not much more.
Several telescopes have taken detailed images of the bar of the Milky Way, from different directions, and all have found a concentration of stars in a band in the middle, which adds evidence that we’re a spiral galaxy. Put it this way, if we were an elliptical galaxy, we’d see stars of our galaxy spread around the sky, not just in a single band.
At the centre of our galaxy is a dense bar-shaped cluster of stars, a veritable bulge, where most of the activity happens. And all the stars in our galaxy revolve around this galactic centre. It takes our Sun about 250 million years to do one full orbit so in terms of whether we notice the difference in our position, I’d say the answer is no.
Even though all the stars we can see in the sky are part of the Milky Way, the galaxy gets its name – no, not from the chocolate bar, the stars came first – but from how it appears as a milky band of light in the sky. So what are we looking at?
In short, that bright, milky streak in the sky, is what I’ve talked about: the bright, star-packed centre of our galaxy. Are we alone in it? Who knows. Give it a wave next time we get a clear night, and most of all appreciate how lucky we are to be able to see this wonder at all.
A version of this piece was originally broadcast on Radio Scilly in August 2019.
We’ve had lots of lovely visitors to our observatory over the last couple of weeks, and thankfully the skies are getting just that little bit darker, so that now by 10pm you’ve got a good selection of stars and planets to ogle at. This week we enjoyed a great session looking at the first-quarter Moon through our two biggest telescopes and spotting Jupiter and Saturn along the ecliptic.
Remember that it’s the busiest time of year here on Scilly and our sessions have proven to be very popular, so we do recommend you booking in advance, particularly for evenings, if you’d like to visit us in person.
The star event this week is not a star but the Perseids. The annual Perseid meteor shower reaches its peak on the night of the 12th August this year. If the weather plays fair with us, you should be able to see up to 70 shooting stars per hour, streaking across our skies. However we will be subject to a bright Moon causing us some light pollution, which will drown out the fainter ones. Don’t let this put you off though – the Perseid meteor shower is one of the best and most loved meteor showers in the northern hemisphere, for good reason. These meteors can be spectacular.
You don’t have to wait until Monday night to spot Perseids. We tend to focus on the peak of activity, entirely reasonable, but actually Perseids have been streaking across our sky since about the 17th July, and activity has ramped up from the beginning of August. You might have even seen some already! The Perseids tend to take a while to build up to a peak before falling off sharply – though we’ll still see them up to 10 days after the peak of activity on the 12th.
So what do they look like and why are they so special?
Perseid meteors are particularly bright and fast with lovely long trails. It’s one of the most active meteor showers of the whole year. There’s a particularly high chance of seeing fireballs – very bright meteors – as well. While they can be seen streaking across any part of the sky, they seem to radiate – or come from – within the constellation of Perseus, or, to my mind and somewhat easier to spot, below the wonky W of Cassiopeia.
Meteors in these annual showers come from streams of debris left behind in space, by comets. In this case, that’s Comet Swift Tuttle. As our planet Earth crosses the orbital path of Comet Swift Tuttle, bits of the comet’s debris slam into our Earth’s upper atmosphere at an average speed of 36 miles per second, burning up on impact. This force of energy causes quite the night-time light show from these fast-moving meteors.
And how best to view the Perseids?
The good news is that you don’t need any special equipment or knowledge of the constellations! Get yourself to a spot where you’ve got dark, open sky. Open sky is essential because these meteors fly across the sky in many directions and in front of lots of different constellations. On Scilly, finding dark and open sky is an easy one, but you’ll still want to take yourself away from any outdoor lighting or glare from house lights. You might want to lie on the grass - or beach - or get yourself a nice reclining deck chair with a blanket!
The weather for the peak of the activity this year is looking variable, though we may be lucky enough to snatch some cloud-free moments. The best time to look is towards midnight and after, when the chances of seeing increase. However, meteors are part of nature and there’s no way to predict how many you’ll see during any given period. Be patient. In any case, to get the best of it, give yourself at least an hour of observing time – and remember your eyes can take up to 20 minutes to adjust to the dark. Perseids can come in fits and starts and good things come to those who wait. Find yourself a good spot and relax – you’ll see some.
Let us know how you get on – and remember you can share any photos on our COSMOS Facebook group or email them to me at email@example.com. Enjoy those shooting stars!