Posts Tagged ‘photo’

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Astronomy is contagious!

April 29, 2013

by yaska77

The great thing about astronomy is that anyone with a sky over their heads can get involved. You don’t need a truckload of expensive gear, just an interest and a modicum of patience will get you a long way!

Soon after I got my camera and started posting images on this blog, Mick Judd (a talented photographer who I happen to work with) also began skywatching, and he has captured some great shots with limited “astro-specific” equipment.

After we recently discussed the upcoming penumbral eclipse on 25th April (see our images here) Mick went home and over the course of a few evenings has produced the following short video, which we hope you enjoy.

We think it’s great, and just the sort of thing we hope will help others catch the astronomy bug! But how did he do it?  I’ll let him explain that himself!

“To capture the images I used two different eyepieces on a D=60mm F=700mm telescope; an H20 to fit the whole of the moon in the frame and an HF6 for the close-ups of the lunar surface and for Saturn. To attach the camera (a Sony Ericsson Xperia Arc S mobile phone) I drilled a hole in the middle of a plastic lid from a can of hair mousse, and glued it around the lens hole on the phone’s protective case.

Slotting the plastic lid over the eyepiece housing on the telescope and pushing it into place, it’s then a bit of hit and miss with lining up what I can see in the finder scope with what I can see on the phone’s display. The Xperia Arc S has a lot of camera settings so it’s just a matter of adjusting EV levels and using a bit of digital zoom to fill the frame to avoid seeing the round edge of the eyepiece.

To try and make sure that I capture something that is sharp I slightly tweak the scope’s focus every now and then between shots. The Sunspots were viewed through an additionally fitted Solar filter.  All the footage in the video was captured between 15th and 27th April 2013.”

Top work Judd bloke, and an ingenious set up!

You can see more of Mick’s photos on his Flickr page here

Now everyone get outdoors and enjoy the night sky! :)

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Hubble eyes up comet ISON

April 24, 2013

by yaska77

Billed as possibly the “comet of the century”, C/2012 S1 ISON has recently found itself in the sights of the Hubble Space Telescope. Still too far away to be seen by the naked eye, what has been exciting astronomers about ISON is its potential to become briefly brighter than a full Moon as it makes its closest approach to the Sun around the 28th of November.

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Even at a distance of 386 million miles from the Sun, comet ISON is being warmed causing sublimation, the creation of its tail (click to enlarge) – Credit: NASA, ESA, J.-Y. Li (Planetary Science Institute), and the Hubble Comet ISON Imaging Science Team

The comet’s dusty coma, or head of the comet, is approximately 3,100 miles across, or 1.2 times the width of Australia. A dust tail extends more than 57,000 miles, far beyond Hubble’s field of view.

More careful analysis of the image (captured on 10th April) is currently underway to improve these measurements and help predict the possible outcome of the sungrazing passage of this comet, but the formation of a tail while still so far from the Sun could mean ISON breaks up before putting on the show we all want it to!

ISON was discovered in September 2012 by the Russian-led International Scientific Optical Network using a 16-inch telescope.

Source: Hubblesite.org

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Curiosity goes where water once flowed

September 28, 2012

by yaska77

NASA’s Curiosity rover has returned images showing evidence of an ancient, flowing stream on Mars after a close examination of two outcrops called “Hottah” and “Link”.

The rock outcrop shown below (named “Hottah” after Hottah Lake in Canada’s Northwest Territories) may look like broken up pavement, but it is actually exposed bedrock made up of smaller fragments cemented together.

This is what geologists call a “sedimentary conglomerate“. Scientists theorise that the bedrock was disrupted in the past (giving it the tilted angle) most likely through meteorite impacts.

NASA’s Curiosity rover has found evidence for ancient flowing streams on Mars at a few sites, including the rock outcrop pictured here (click to enlarge) – Credit: NASA/JPL-Caltech/MSSS

The key evidence for the ancient stream comes from the size and rounded shape of the gravel in and around the bedrock.

Hottah has pieces of gravel embedded in it, called clasts (one of which is circled above), up to a couple inches in size and located within a matrix of sand-sized material. Some of the clasts are round in shape, leading to the conclusion they were transported by a vigorous flow of water.

This set of images compares the Link outcrop of rocks on Mars on the left, with similar rocks seen on Earth on the right (click to enlarge) – Credit: NASA/JPL-Caltech/MSSS and PSI

The gravels in conglomerates at both outcrops range in size from a grain of sand to a golf ball. Some are angular, but many are rounded, and the similarity to pebbles found desposited in Earth’s streams and rivers is striking.

“The shapes tell you they were transported and the sizes tell you they couldn’t be transported by wind. They were transported by water flow,” said Curiosity science co-investigator Rebecca Williams of the Planetary Science Institute in Tucson, Arizona.

The finding site lies between the north rim of Gale Crater and the base of Mount Sharp, a mountain inside the crater which is Curiosity’s ultimate destination. Once there the rover will examine the sedimentary layers in the hope it will discover evidence of organic deposits, therefore confirming the past existance of life on Mars.

This is a truly exciting find!

Source: NASA MSL

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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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Astrophotographers capturing the heavens

March 7, 2012

by yaska77

Space pics are cool, no argument from us there. Since we started this blog we’ve brought you enough images to fill a photo album (and have slipped in quite a few of our own along the way).

A lot of people think you need in depth knowledge or mega expensive gear to take astro photos, but from our time spent in the “twitterverse” we’ve learnt that not only are there thousands of enthusiasts eager to get stuck in, but a multitude of talented people who do extraordinary things with a range of equipment!

The Moon

The first point of call for most night sky snappers is our beautiful Moon. We first started imaging the Moon using handhelds and camera phones (held up to the eyepiece of the telescope), but there are a variety of ways to get great images!

This waning Moon image shows great colour! (click to enlarge) - Credit: CJ5ive

If you don’t have a telescope, a DSLR can capture superb images all on its own. Twitter user CJ5ive used a Nikon D200 to grab this shot, and it looks great! Having a sturdy tripod helps remove any camera shake caused by the shutter opening, and with good seeing conditions you can get crystal clear shots.

Moon crater details are well defined in this iPhone 4s image (click to enlarge) - Credit: Phil Hammond

Don’t have a DSLR but have a telescope? With a steady hand Phil Hammond took this great example of afocal photography, using an iPhone 4s and a Sky-Watcher Evostar 102 Telescope. It can take a little patience to get it lined up, but you can get some great close up images.

Using a CCD camera you can capture superb detail, as demonstrated in this image of the Clavius crater (click to enlarge) - Credit: Paul Wharton

Want to get even closer? By using a CCD Camera (like a webcam) you can record video of your target and then stack the individual frames to bring out the details. Paul Wharton provided us with this great close-up of the Clavius crater on the Moon, taken using a Sky-Watcher 200P Telescope and a Trust webcam from eBay bought for 99p!

The Planets

Getting a close up look at the planets through a telescope can be awe inspiring, so imaging them can be very rewarding.

Using a webcam attached to a telescope you can get great images like this great view of Jupiter (click to enlarge) - Credit: John Mason

Jupiter is always a good target as through a telescope you can see clear details. John Mason‘s image shows Jupiter as a beautiful marble in space, captured using a Nexstar 6SE SCT Telescope and a SPC800 webcam (compiled using the stacking software Registax).

The superb clarity of this image of Jupiter (complete with two Moons) by Paul Wharton shows the beauty of the planet (click to enlarge) - Credit: Paul Wharton

The brilliant clarity of this image of Jupiter (complete with two Moons) highlights the beauty of the giant planet - Credit: Paul Wharton

Getting even closer to Jupiter this shot from Paul Wharton shows the different bands, the famous spot and two of Jupiter’s moons. You can even make out the shadow of a moon transiting the disc of the planet! This fantastic image was captured using a Sky-Watcher 200P Telescope and a Philips webcam.

Saturn is another must see through a telescope, and Jamey imaged it incredibly clearly (click to enlarge) - Credit: Jamey Erickson

There’s also nothing like the feeling of viewing the rings of Saturn with your own eyes. Very little compares to seeing it live (as it were) but the picture produced by Jamey Erickson comes awfully close! Created by stacking 40 light frames (with no dark frames) using a Celestron CGE-1100 SCT Telescope, a Canon 5D Mk II remote via MacBook Air, all guided with an iPad via SkySafariPro. That’s quite a setup!

Stars and a Nebula

Most of the time clouds are an astrophotographer’s nemesis, but they can help provide great atmosphere to a photo of the stars.

Cloud movement in a long exposure shot can create a beautiful ethereal feel when in front of a clear star filled background (click to enlarge) - Credit: John Mason

Orion is one of the most easily recognisable constellations in the night sky, and John Mason took this great shot of it framed by clouds using a Canon 1000D at 18mm on a 7 second exposure.

A similar shot of the fantastic Orion, with added International Space Station goodness (click to enlarge) - Credit: Sarah (purpleface)

The ISS frequently passes over the UK, an example of such a pass can be seen in Sarah’s image featuring Orion and the Hyades cluster above. Taken using a Canon 7D with the 18-55mm kit lens, 15 second exposure at ISO 400 (f/3.5). It also helps demonstrate just how far the space station travels across the sky in 15 seconds when moving at around 17,500mph.

It’s about 73 miles, the equivalent driving distance from Peckham in London to Dover by the English Channel!

Using a good zoom lens you can clearly capture the dusty shape of the Orion Nebula (click to enlarge) - Credit: Sarah (purpleface)

Using the same camera but this time a 90-300mm lens, Sarah’s shot of the Orion Nebula shows clear definition of its familiar shape, taken at an exposure time of 3.2 seconds, ISO 5000 (f/5.6).

Stacked shots taken via a telescope can provide far more detail than a single exposure alone, as this fantastic image demonstrates (click to enlarge) - Credit: Jamey Erickson

This jawdropping picture of the Orion Nebula from Jamey is the result of stacking 50 light frames and 50 dark frames (with the same equipment as his Saturn image above). Both images were stacked in Nebulosity and processed in PixInsight.

If you’d like to have a look through more of our contributor’s photographs, click on their name below and you’ll be transported to their snaps or Twitter feed. This is just a small example of what our friends on Twitter are doing, so they’re well worth a look through!

Come and join in the fun :)

Contributors

CJ5ive on Flickr
Phil Hammond on Twitter
Paul Wharton on Flickr
John Mason on Twitter
Jamey Erickson on Flickr
Sarah (purpleface) on Flickr

All images are copyright their respective owners

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