Posts Tagged ‘EOS’

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Penumbral eclipse, full moon, no clouds!?

April 25, 2013

by yaska77

It’s been a very slow couple of months of late. The British weather is infamous the world over, and not only have we just experienced the first real warmth of spring, but an abundance of evening clouds have kept many a garden astro indoors.

The signs were good this evening however, there was a penumbral eclipse on the April Full Moon (as noted in our April Astro Guide), and not a cloud in the sky! What madness was this!?

Penumbral Eclipse 25042013 21.07 BST Sky-Watching.co.uk

Taken with a Canon Eos 550D and a 250mm lens mounted to a fixed tripod, the penumbral eclipse is visible over the top left edge of the full Moon (click to enlarge) – Credit: Sky-Watching/A.Welbourn

Some time ago the spotter scope on my telescope was knocked out of alignment, so combined with the clouds it’s been a shamefully long time since I used it.

Looking on this evening as a chance to at least re-align the spotter scope (even if the Moon would not rise high enough to see any of the partial eclipse), I set up and found my fence was just low enough for the scope to catch it before the shadow passed!

Penumbral Eclipse 25042013 21.22 BST Sky-Watching.co.uk

Now mounted to my Sky-Watcher 200P Telescope, the partial eclipse is still a visible shadow over the northern edge of the Full Moon (click to enlarge) – Credit: Sky-Watching/A.Welbourn

So finally we’ve had an astronomical event that the clouds missed. But not by much I can tell you, an hour after these photos were taken the Moon was enveloped behind a blanket of cloud.

So we do get a break once in a while after all :)

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Transit of Venus 2012 – My “last in our lifetime” washout (but with a silver lining…)

June 6, 2012

by yaska77

The alarm went off just after 4am this morning. Dragging myself to the window in the hope last night’s rain had passed and the sky would allow unrestricted access to the transit of Venus, I drew back the curtains to find a dull cloudy grey blanket with occasional downpours of rain.

On June 5 2012, SDO captured this image of one of the rarest predictable solar events: the transit of Venus across the face of the Sun (click to enlarge) – Credit: NASA/SDO, HMI

I waited up for half an hour to see if there was any sign of improvement, and if anything it rained more.

While the images already being posted online in their hundreds provide a great catalogue of this special event, I personally lucked out again thanks to the British weather.

Typically, when I got up later the clouds were breaking and the Sun could be seen.  I’m prepared to admit I spent rather a lot of time making a homemade solar filter for my camera using Baader AstroSolar Safety Film, so I was certainly not going to waste a chance to at least test it.

By cutting a hole of equal size in two squares of card, you can then fix the solar film between them, then make a collar for your lens by wrapping strips of card around it and then fixing it to the filter square (click to enlarge) – Credit: Sky-Watching/A.Welbourn

The next image that follows is bittersweet for me. Sweet in the fact that I’ve been able to image the Sun using a standard zoom lens on my Canon Eos 550D for the first time, but bitter because is shows I could clearly have captured the Venus transit this morning if only the weather had played ball.

C’est la vie.

Shot from my own back garden, the sunspots match those in the SDO image at the top, so I could have captured my own bit of history (click to enlarge) – Credit: Sky-Watching/A.Welbourn

Sadly my image is missing the very important detail of the planet Venus during transit, as the sunspots match those seen in the SDO image released by NASA.  If only it could have held out for a few more hours (ha!) I’d have got it, and with some degree of clarity too. Not to be seen again until 2117…

Using this solar filter however has sparked an idea, one which will require some more sunspot activity but also a week of good weather with clear skies at about the same time of the day for several days in a row.

I’d like to show the relative movement of similar massive sunspots over a short period of time.

So should this come to fruition the transit blocking clouds may well have had a silver lining :)

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ISS pass near Venus – 17th April 2012

April 17, 2012

by yaska77

There’s a great account you can follow on Twitter if you’d like to be sent alerts whenever the ISS will be passing your location. Twisst ISS alerts send out thousands of messages every day, and right on shedule this evening the ISS began a pass over my house.

The ISS streaks across the sky near to the bright planet Venus from 17th April (click to enlarge) - Credit: Sky-Watching/A.Welbourn

Taken using a 50mm lens on a 6 second exposure (f/2.5 ISO-200), I think enough of the stars appear cleanly without too much drifting. Venus is beautiful at the moment, and it always looks great in an image!

The ISS streak seems to "phase" as it passes behind part of a tree (click to enlarge) - Credit: Sky-Watching/A.Welbourn

So, 10 minutes in the cold and a nice, bright, high ISS pass later I’m back indoors with a hot cuppa.

And my Canon Eos 550D is having its batteries charged. The Lyrids meteor shower peaks soon, I think I’ll get the flask ready for a night in the cold!

If you’re on Twitter you can follow @twisst and while you’re there, why not follow us too!

And if not you’re not on Twitter yet, come and join us!

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Venus in the Pleiades – 4th April 2012

April 4, 2012

by yaska77

As per usual our skies were cloudy last night. I’m beginning to believe the clouds wait to roll in just before particular astral events, usually the ones I most want to see! Last night (as noted in our Astro Guide for April) the planet Venus appeared as if part of the Pleiades star cluster.

Thankfully tonight Venus hasn’t moved on all that far, and a break in the clouds just after sunset gave us the chance to get some photos!

The bright planet Venus shines next to the Pleiades cluster, and the setting Jupiter is accompanied by some of her moons (click to enlarge) - Credit: Sky-Watching/A.Welbourn

Taken with a Canon Eos 550D using a 50mm lens (4 sec exposure, f/3.5, ISO400), virtually none of the stars you can see in the image above were visible to the naked eye!

A cropped full size view of the beautiful Pleiades next to a radiant Venus (click to enlarge) - Credit: Sky-Watching/A.Welbourn

This is a fullsize cropped section of the image. Yesterday Venus would have appeared lower down and closer to the lower left edge of the cluster, so they would both have appeared in the field of view if the Canon were attached to a telescope.  Another missed opportunity.

Still, the great thing about astrophotography is that there’s always something worthy of imaging, and we like the shots we got this evening.

Space is cool :)

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Astronomy Events – October 2011

September 30, 2011

by yaska77

Here is a list of upcoming Astronomy events for October. The recent clear warm nights at the end of September have given us the chance to get a look at a few things, but the sky is so big! How do you choose!? Well, this latest guide might just have a few suggestions of interest.

Saturday 1st October – In the early hours of 1st and 2nd October the planet Mars can be found right in front of Praesepe (the Beehive Cluster, Messier 44), in the constellation Cancer. Should be great to see with binoculars or a small telescope!

You can see what this actually looked like in our photographs here  (and compare it to the guide image below!), it was one of many targets on what turned out to be a great night!

Mars in the Beehive Cluster, to the east at 02:30 UTC/GMT 1st October (click to enlarge) - Credit: Stellarium/Sky-Watching

Tuesday 4th October -  First quarter Moon

Saturday 8th October – The annual Draconid meteor shower (also known as the Giacobinids) should reach its peak this evening (the height of activity expected between 16:00 and 22:00 UTC/GMT), with calculations suggesting we could be in for an outstanding display. The ZHR (Zenithal Hourly Rate) could range from a few tens of meteors per hour to several hundred

The image below can help guide your eyes, but if it’s as busy as forecasts are suggesting you should see them all over the sky, despite a bright Moon to the south. It might wash out some of the fainter meteors but you should still see the brighter flashes. Draconid meteors are also known to be very slow moving

The location in the night sky Draconid meteors will appear to originate from

The sky at 20:00 UTC/GMT 8th October 2011, to spot Draconids look to the North West (click to enlarge) - Credit: Stellarium/Sky-Watching

Tuesday 11th/Wednesday 12th October – Full Moon and Moon at Apogee (406,435 km), the farthest it gets away from the Earth during it’s orbit. This full Moon is sometimes known as the Hunter’s Moon or Blood Moon (occurs at 02:05 GMT)

Thursday 13th October – The planet Saturn is in superior conjuction on the far side of the Sun, so will be unobservable throughout October

Monday 17th October -  Tonight should see the start of the annual Orionids meteor shower (17th-25th). The Orionids are considered a universal sky-watching opportunity as the radiant point is close to the celestial equator, meaning both hemispheres (northern and southern) will see some of the display not lost in the Moon’s glare. The peak should be on 21st October with a ZHR of around 20-25 per hour

Orionid meteor radiant at 00:00 21st October (click to enlarge) - Credit: Stellarium/Sky-Watching

Thursday 20th October – Last quarter Moon. It won’t rise until after midnight so a good chance earlier on to maybe catch a few meteors

Wednesday 26th October – New Moon and Moon at Perigee (357,050 km), the closest point of its orbit around the Earth.

Jupiter and moons (left to right: Callisto, Europa, Io and Ganymede) from 28th September 2011 (Click to enlarge) - Credit: Sky-Watching/A.Welbourn

Saturday 29th October -  Jupiter is at opposition in the constellation Aries, meaning it is in the opposite side of the sky to the Sun, and will appear at it’s brightest

Sunday 30th October -  British Summertime ends at 02:00 BST, when the clocks go back 1 hour to 01:00 GMT (but at least I get an extra hour in bed!)

Remember, it can take your eyes up to 20 minutes to become properly dark adapted, and anything up to an hour for a telescope to reach ambient temperature outside (to ensure the best image), so give yourself plenty of time to get set up!

We recently added the “Monthly Guide” section in the menu bar to the right (where this guide will appear), so next time you visit you can find it again easily!

Guide images created with Stellarium

Archive:
Astronomy Events – September 2011
Astronomy Events – August 2011
Astronomy Events – July 2011

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