Hello, Austral Autumn Sky


Southern Autumn Sky Panorama (Spherical)

The sky looks very different from down under. This is the entire sky of early evening as autumn begins in the southern hemisphere.

My last post showed Orion and the winter sky disappearing into the west, from home in Alberta.

This post shows that same area of sky (here at top) also setting into the west. But that’s the only area of sky familiar to northern hemisphere stargazers.

Everything below Orion and Sirius is new celestial territory for the northern astronomer. Welcome to the fabulous southern hemisphere sky.

And to the autumn sky – From home it is spring. From here in the southern hemisphere summer is giving way to cool nights of autumn.

Straight up, at centre, is the faint Milky Way area containing the constellations of Puppis and Vela, formerly in the constellation of Argo Navis.

Below, the Milky Way brightens in Carina and Crux, the Southern Cross, where dark lanes divide the Milky Way.

At right, the two patches of light are the Large and Small Magellanic Clouds, satellite galaxies of our Milky Way.

The bright object at left is Jupiter rising over the Tasman Sea.

Southern Autumn Sky Panorama (with Labels)

I shot this 360° panorama on March 31, 2017 from Cape Conran on the Gippsland Coast of Victoria, Australia, at a latitude of 37° South.

I’ve turned the panorama so Orion appears as we’re used to seeing him, head up and feet below. But here in the southern hemisphere the image below despicts what he looks like, as he dives headfirst into the west in the evening twilight.

Orion and Waxing Moon Setting at Cape Conran

The bright object here is the waxing crescent Moon, here in Taurus. Taurus is below Orion, while Sirius (the bright star at top) and the stars of Canis Major are above Orion.

Orion, the Milky Way and Waxing Moon at Cape Conran

This view above takes in more of Canis Major. Note the Pleiades to the right of the Moon.

Visiting the southern hemisphere is a wonderful experience for any stargazer. The sky is disorienting, but filled with new wonders to see and old sights turned quite literally on their heads!

— Alan, April 4, 2017 / © 2017 Alan Dyer / AmazingSky.com

 

The Great Solstice Aurora of 2015


The all-sky aurora of June 22, 2015, during a level 7 to 9 geomagnetic storm, as the display began already active in the darkening twilight of a solstice night. This is one frame from a 568-frame time-lapse, taken with the 8mm Sigma fish-eye lens at f/3.5 and with the Canon 6D, composed for projection in tilt-dome digital planetariums. I was on the south shore of Crawling Valley Lake and Reservoir in southern Alberta.

Aurora watchers were on alert! Look up after sunset on June 22 and the sky should be alive with dancing lights.

And the predictions were right.

I headed out to a nearby lake in preparation for seeing and shooting the show. And as soon as the sky got dark enough the Lights were there, despite the bright solstice twilight.

The all-sky aurora of June 22, 2015, during a level 7 to 9 geomagnetic storm, as the display began already active in the darkening twilight of a solstice night. This is one frame from a 960-frame time-lapse, taken with the 15mm full-frame fish-eye lens at f/2.8 and with the Canon 60Da, looking north to the perpetual twilight of solstice. I was on the south shore of Crawling Valley Lake and Reservoir in southern Alberta.

The display reached up to the zenith, as seen in my fish-eye images, like the one below. I shot with three cameras, all shooting time-lapses, with the fish-eye camera recording the scene suitable for projection in a digital planetarium.

The all-sky aurora of June 22, 2015, during a level 7 to 9 geomagnetic storm, as the display peaked in a substorm with rays converging at the zenith in the darkening twilight of a solstice night. This is one frame from a 568-frame time-lapse, taken with the 8mm Sigma fish-eye lens at f/3.5 and with the Canon 6D, composed for projection in tilt-dome digital planetariums. I was on the south shore of Crawling Valley Lake and Reservoir in southern Alberta.

However, it was apparent we here in western Canada were seeing the end of the display that had been going on for hours during an intense geomagnetic storm. The aurora was most intense early in the evening, with a minor outburst about 11:30 to 11:45 pm MDT.

The all-sky aurora of June 22, 2015, during a level 7 to 9 geomagnetic storm, as the display began already active in the twilight of a solstice night. This is one frame from a 960-frame time-lapse, taken with the 15mm full-frame fish-eye lens at f/2.8 and with the Canon 60Da, looking north to the perpetual twilight of solstice. I was on the south shore of Crawling Valley Lake and Reservoir in southern Alberta.

The aurora then subsided in structure and turned into a more chaotic pulsating display, typical of the end of a sub-storm.

A sky-covering display of Northern Lights, here in the western sky over a distant thunderstorm on the Alberta prairies. I shot this June 22, 2015 on a night with a grand display over most of the sky, with the sky bright with solstice twilight. The site was on the south shore of Crawling Valley Lake in southern Alberta. This is one frame from a 350-frame time-lapse, taken with the Nikon D750 and 24mm lens,

However, an attraction of this display was its juxtaposition over another storm, an earthly one, flashing lightning to the northwest of me.

The all-sky aurora of June 22, 2015, during a level 7 to 9 geomagnetic storm, as the display brightened again in the middle of the night at about 1 am, with rays converging at the zenith in the perpetual twilight of a solstice night. This is one frame from a 568-frame time-lapse, taken with the 8mm Sigma fish-eye lens at f/3.5 and with the Canon 6D, composed for projection in tilt-dome digital planetariums. I was on the south shore of Crawling Valley Lake and Reservoir in southern Alberta.

By 1 a.m. MDT the display, while still widespread over a large area of the northern sky, had turned into a diffuse glow.

But 60 gigabytes of images later, I headed home. The time-lapse compilation will come later!

– Alan, June 23, 2015 / © 2015 Alan Dyer / www.amazingsky.com

Night of the Space Station


A pass of the International Space Station in the bright moonlight, on the evening of May 31, 2015, with the gibbous Moon to the south at centre. The view is looking south, with the ISS travelling from right (west) to left (east) over several minutes. This was the first pass of a 4-pass night, May 31/June 1, starting at 11:06 pm MDT this evening. Numerous other fainter satellite trails are also visible. This is a composite stack of 95 exposures, each 2 seconds at f/2.8 with the 14mm lens and ISO 6400 with the Canon 6D. The gaps are from the 1-second interval between exposures. The length of the trails and gaps reflects the changing apparent speed of the ISS as it approaches, passes closest, then flies away.  I stacked the exposures with the Advanced Stacker Actions from StarCIrcleAcademy.com, using the Lighten mode. The ground comes from a Mean blend of just 8 of the exposures to prevent shadows from blurring but to smooth noise.

The Space Station is now continuously lit by sunlight, allowing me to capture dusk-to-dawn passages of the ISS.

On the night of May 31/June 1 I was able to shoot four passages of the International Space Station on successive orbits, at 90-minute intervals, from dusk to dawn.

The first passage, at 11:06 p.m., was low across the south. It’s the image at top.

An overhead pass of the International Space Station in a bright moonlit sky on the night of May 31/ June 1, 2015, with the gibbous Moon in to the south, below. The view is looking south, with the ISS travelling from right (west) to left (east) over several minutes. This was the second pass of a 4-pass night, May 31/June 1, starting at 12:44 am MDT this morning.  This is a composite stack of 91 exposures, each 4 seconds at f/3.5 with the 8mm fish-eye lens and ISO 6400 with the Canon 6D. The gaps are from the 1-second interval between exposures. The length of the trails and gaps reflects the changing apparent speed of the ISS as it approaches, passes closest, then flies away. The stars are trailing around Polaris at top. An aircraft supplies the other dashed trail across the top and intersecting with the ISS trail. I stacked the exposures with the Advanced Stacker Actions from StarCIrcleAcademy.com, using the Lighten mode. The ground comes from a Mean blend of just 8 of the exposures to prevent shadows from blurring but to smooth noise.

Then at 12:45 a.m. the Space Station came over again, now directly overhead. It’s the image above. The Moon is the bright glow at bottom.

An overhead pass of the International Space Station in a bright moonlit sky on the night of May 31/ June 1, 2015, with the gibbous Moon in the southwest, below. The view is looking south, with the ISS travelling from right (west) to left (east) over several minutes. This was the third pass of a 4-pass night, May 31/June 1, starting at 2:21 am MDT this morning.  This is a composite stack of 66 exposures, each 4 seconds at f/3.5 with the 8mm fish-eye lens and ISO 6400 with the Canon 6D. The gaps are from the 1-second interval between exposures. The length of the trails and gaps reflects the changing apparent speed of the ISS as it approaches, passes closest, then flies away. The stars are trailing around Polaris at top. Unfortunately, I missed catching the start of this pass. I stacked the exposures with the Advanced Stacker Actions from StarCIrcleAcademy.com, using the Lighten mode. The ground comes from a Mean blend of just 8 of the exposures to prevent shadows from blurring but to smooth noise.

One orbit later, at 2:21 a.m., the Station came over in another overhead pass in the bright moonlight.

A pass of the International Space Station in the brightening twilight of dawn, on the morning of June 1, 2015, with the gibbous Moon setting to the southwest at right. The view is looking south, with the ISS travelling from right (west) to left (southeast) over several minutes. This was the last pass of a 4-pass night, May 31/June 1, starting at 3:55 am MDT this morning.  This is a composite stack of 144 exposures, each 2 seconds at f/2.8 with the 15mm full-frame fish-eye and ISO 3200 with the Canon 6D. The gaps are from the 1-second interval between exposures. The length of the trails and gaps reflects the changing apparent speed of the ISS as it approaches, passes closest, then flies away.  I stacked the exposures with the Advanced Stacker Actions from StarCIrcleAcademy.com, using the Lighten mode. The ground comes from a Mean blend of just 8 of the exposures to prevent shadows from blurring but to smooth noise.

The final passage of the night came at 3:55 a.m. as the sky was brightening with dawn twilight and the Moon was setting. This was another passage across the south, and made for the most photogenic pass of the night.

Here’s an edited movie of the four passes, with a little music just for fun.

Seeing the Space Station on not one but two, three, or even four orbits in one night is possible at my latitude of 50 degrees north around summer solstice because the Station is now continuously lit by sunlight — the Sun never sets from the altitude of the ISS.

When the ISS should be entering night, sunlight streaming over the north pole still lights the Station at its altitude of 400 km.

To shoot the time-lapse clips and stills I used 8mm and 15mm fish-eye lenses, and a 14mm ultra-wide lens.

The bright moonlight made it possible to use short 2- to 4-second exposures, allowing me to record enough frames at each passage to make the little movies of the ISS flying across the sky. Keep in mind, to the eye, the ISS looks like a bright star. Some image processing trickery adds the tapering trails.

I used the Advanced Stacker Actions from StarCircleAcademy.com to create the trail effects, and to stack the time-lapse frames into single composite still images. The gaps in the trails are from the one second interval between frames.

– Alan, June 2, 2015 / © 2015 Alan Dyer / www.amazingsky.com

The Red Aurora of May 10


A strange red/magenta auroral arc overhead across the sky, with a more normal green diffuse glow to the north, as seen on May 10, 2015, in a stack of 80 frames taken over 45 minutes. The Big Dipper is overhead in the centre of the frame, Jupiter is at left in the west and Arcturus is at top to the south. I shot this from home, using an 8mm fish-eye lens to take in most of the sky, with the camera looking north. The 80 exposures were stacked and blended with Advanced Stacker Actions from StarCircleAcademy.com using the Long Trails effect. Each exposure was 32 seconds at f/3.6 and ISO 3200 with the Canon 6D. An individual exposure adds the more point-like stars at the start of the tapered star trails, and add the blue from the last twilight glow still illuminating the sky at the start of the sequence.

A strange red arc of aurora moved slowly across the sky on May 10.

All indicators looked favourable early in the evening on May 10 for a good auroral display later that night, and sure enough we got one. But it was an unusual display.

From my site in southern Alberta, the northern sky did have a diffuse glow of “normal” green aurora that never did take much form or structure.

But overhead the aurora took the form of an arc across the sky, starting as an isolated ray in the southeast initially, then reaching up to arch across the sky with what looked to the eye like a colourless band.

But the camera showed it as a red arc, with just a fringe of green curtains appearing for a few minutes.

Be sure to click HD and enlarge the video to fill your screen.

The time-lapse movie shows the sequence, over about 90 minutes, with 170 frames playing back at 12 frames per second. You can see the red arc develop, then become more narrow, then exhibit a few green curtains. Then it fades away.

Large-scale pulses also brighten the whole sky momentarily.

A strange red/magenta auroral arc overhead across the sky, with a more normal green diffuse glow to the north, as seen on May 10, 2015. The Big Dipper is overhead in the centre of the frame, Jupiter is at left in the west and Arcturus is at top to the south. I shot this from home, using an 8mm fish-eye lens to take in most of the sky, with the camera looking north. It is part of a 170-frame time-lapse sequence. Exposure was 32 seconds at f/3.6 and ISO 3200 with the Canon 6D.

The other images are individual frames taken during the evening, showing snapshots of the red arc development, as it became more narrow in structure and gained green curtain-like fringes.

Presumably the red structure was very high in the atmosphere while the green curtains attached to it that did appear hung down from the high-altitude red arc.

A strange red/magenta auroral arc overhead across the sky, with a more normal green diffuse glow to the north, as seen on May 10, 2015. The Big Dipper is overhead in the centre of the frame, Jupiter is at left in the west and Arcturus is at top to the south. I shot this from home, using an 8mm fish-eye lens to take in most of the sky, with the camera looking north. It is part of a 170-frame time-lapse sequence. Exposure was 32 seconds at f/3.6 and ISO 3200 with the Canon 6D.

I shot all images with an 8mm fish-eye lens to capture most of the sky. The camera is looking north toward Polaris, with the Big Dipper almost directly overhead near the centre of the frames.

The main image at top is a star-trail stack of 80 frames showing the sky’s circumpolar motion around Polaris and the aurora blurred and blended over 45 minutes of motion. I stacked the frames with the Advanced Stacker Actions from StarCircleAcademy.com

– Alan, May 11, 2015 / © 2015 Alan Dyer / www.amazingsky.com

A Stunning Sky of Subtle Glows


Zodiacal Light Panorama (Circular)

What a fabulous night! The desert sky was full of subtle glows and myriad stars.

Friday, January 16 was a stunning evening for stargazing. I took the opportunity to shoot a 360° panorama of the evening sky, recording a host of subtle glows.

The Zodiacal Light reaches up from the western horizon and the last vestiges of evening twilight. This is the glow of sunlight reflecting off cometary dust particles in the inner solar system. From the clear desert skies it is brilliant.

The dark of the Moon periods in January, February and March are the best times of the year to see the evening Zodiacal Light from the northern hemisphere.

The Milky Way arches across the eastern sky from Cygnus to Canis Major. That’s light from billions of stars in our Galaxy.

At centre, in the circular fish-eye image above, is the small wisp of green Comet Lovejoy, near the zenith overhead and appearing at the apex of the Zodiacal Light’s tapering pyramid of light.

Zodiacal Light Panorama (Rectilinear)

This view is from the same images used to create the circular all-sky scene at top, but projected in a rectangular 360° format.

Technical notes:

I shot 8 segments for the panorama, each a 1-minute exposure at f/2.8 with a 15mm lens oriented in portrait mode, and using a Canon 6D at ISO 3200. There was no tracking – the camera was just on a tripod. Each segment is 45° apart.

I used PTGui software to stitch the segments into one seamless scene.

— Alan, January 16, 2015 / © 2015 Alan Dyer / www.amazingsky.com

Stargazing under the Milky Way


Stargazing at City of Rocks State Park

What a wonderful night for stargazing under the Milky Way and amid the rock formations of southern New Mexico.

This was the scene last night, November 22, at a monthly stargazing session hosted by the City of Rocks State Park and the local Silver City Astronomy Club. You couldn’t ask for a better night … and site.

The Milky Way swept overhead, from Sagittarius setting in the west at left, to Taurus rising in the east at right. The faint glow of Zodiacal Light sweeps up from the last glow of western twilight to the left. Some faint green bands of airglow that only the camera can capture are also visible near the horizon.

Matt is doing a laser tour, following which the group convened to the beautiful roll-off roof observatory that houses a Meade 14-inch telescope. It was a fine evening indeed.

Technical notes:

The panorama, which spans about 300° (I cropped the edges a little from the full 360°) consists of 8 segments, shot at 45° spacings, with a 15mm full-frame fish-eye lens at f/2.8, for 1 minute untracked exposures for each frame at ISO 800 with the Canon 6D. I stitched the segments in PTGui software, but processed them in Adobe Camera Raw and Photoshop.

– Alan, November 23, 2014 / © 2014 Alan Dyer

 

Stars over Mt. Edith Cavell


Mt Edith Cavell by Starlight

The stars of the summer sky shine over the North Face of Mt. Edith Cavell.

The valley below Mt. Edith Cavell in Jasper National Park is one of the most impressive locations in the Canadian Rockies. At few other sites do you get the sense of standing at the foot of a vertical mountain face.

I shot this view last Friday night, when the waxing Moon was behind the mountain, lighting the clouds and sky but not the mountain and valley directly.

But enough scattered light came from the sky to light the foreground and mountain face to make a nice photo with detail in both earth and sky.

Use of highlight and shadow recovery in Adobe Camera Raw also helps a lot!

Mt. Edith Cavell Trail at Twilight Panorama

This view is a 360° ground-to-zenith panorama I shot earlier in the evening in twilight. It’s from the Trail of the Glacier path, where the path crosses Cavell Creek.

Mt. Edith Cavell was named in 1916 after the World War One nurse who was executed by the Germans for assisting allied soldiers escape occupied Belgium.

– Alan, September 8, 2014 / © 2014 Alan Dyer