Video Submissions

See new, spectacular, or mysterious sky images.
DDAVIS1
Asternaut
Posts: 2
Joined: Sun Jan 29, 2017 1:39 pm

Are animations eligible for APOD?

Postby DDAVIS1 » Fri Sep 29, 2017 10:45 pm

If so I would like to submit these examples for consideration, my latest is my visualization of the eruption of the star V838:

https://vimeo.com/dd4skyart


DDAVIS1
Asternaut
Posts: 2
Joined: Sun Jan 29, 2017 1:39 pm

Re: Video Submissions

Postby DDAVIS1 » Sat Sep 30, 2017 12:27 am

In support of the above animation I made a view of the light echoes in relation to each other, rotated to show something of the volume of the surrounding nebula:

https://vimeo.com/230069982

Pauzi

Re: Video Submissions

Postby Pauzi » Mon Oct 23, 2017 5:24 pm

Meteor real time

i hope you like it :wink:

ISO 51200 1/25sec 25p (4K) f1,4

soldatispace
Asternaut
Posts: 1
Joined: Fri Aug 11, 2017 4:14 pm

Re: Video Submissions

Postby soldatispace » Tue Nov 28, 2017 4:32 pm

Click to play embedded YouTube video.


EXPLANATION from spaceweater.com

On Nov. 22nd, the face of the sun was unblemished by sunspots, and NOAA classified solar activity as "very low." Nevertheless, the skies above Tromso Norway exploded with a remarkable outburst of pink auroras.

This outburst was powered by a stream of solar wind flowing from a hole in the sun's atmosphere. Such holes are common during Solar Minimum, and they require no sunspots to form. That's why auroras continue throughout the 11-year solar cycle.
The pink color of the outburst tells us something interesting about the solar wind on Nov. 22nd: it seems to have been unusually penetrating. Most auroras are green–a verdant glow caused by energetic particles from space hitting oxygen atoms 100 km to 300 km above Earth's surface. Pink appears when the energetic particles descend lower than usual, striking nitrogen molecules at the 100 km level and below.
This is called "the nitrogen fringe."

In recent winters, big displays of pink and white auroras have coincided with spotless suns often enough to make observers wonder if there is a connection. If so, more outbursts are in the offing as the sun continues its plunge toward a deep Solar Minimum. Stay tuned for pink!


CONTEXT:

I live in Switzerland. I had one week vacation left and I needed to book it before the end of the year. So two months in advance, I booked a week in November (a weed with no moon) in order to do some astronomy in the Canaria islands if the weather was not good at home. I would decide at the last minute. So my choice was between these two options.

Then I sow an alert for Aurora, a phenomenon I wanted to see since childhood. I looked at the weather forecast in Tromsø and it looked to be positive. After some hesitation, I eventually took the option to fly to Norway because this is maybe the chance of a lifetime if we consider all the criteria (to be in vacation + nothing planned + Aurora alert + good weather forecast...).

And wow!!!! For my first aurora, that was amazing!!!

The phenomenon appeared so bright on the screen of the camera with my adapted view of the darkness that I reduced the ISO by fear to blow the highlights. It turned to be an error that I tried to correct the best I could in post. So if you see some flickering or an augmented noise, that come from that. Sorry, it was my first attempt. But the event was so spectacular, It absolutly find it worth sharing.

Thank you for watching.
Nicolas

alfas
Ensign
Posts: 35
Joined: Thu Mar 29, 2012 11:57 pm

Re: Video Submissions

Postby alfas » Sun Dec 03, 2017 1:38 pm

Lunar occultation of Jupiter

Jupiter being occulted by the Moon on 25th December 2012, as seen from São Bernardo do Campo, Brazil. This video shows the event 5x faster than real time. Filmed with a Celestron C8 telescope and DBK21AU618.AS camera.

Credit: Rafael Defavari
http://www.rafaeldefavari.com

Click to play embedded YouTube video.

Adrien Mauduit
Ensign
Posts: 67
Joined: Thu Dec 15, 2016 10:58 pm

Re: Video Submissions

Postby Adrien Mauduit » Mon Dec 04, 2017 9:45 am

Facets of the stars

Copyrights: Adrien Mauduit

https://www.youtube.com/watch?v=ZDwuQgETvOo&t=3s

What is this twinkling colored dot of light? If I told you it is extremely far away and can only be seen at night? You guessed it, those are stars, bright ones. These are actually some of the brightest stars in our night sky and you’re about to see them in a very different way…
Have you ever wondered why stars twinkle, some more than others, and some not? Well here is your chance to find out in a very visual way. The light emitted by objects at a very long distance from Earth (at least several light years) travels to us almost without being altered. However as photons are about to end their journey, they face a major obstacle: Earth’s atmosphere. The latter is made of cool gases but is very turbulent with zones of different densities and masses. This differences in pressure, temperature and density make our atmosphere a real hurdle for the light to arrive ‘in one piece’. As photons hit these different layers, they are being diffracted and scattered. This goes for all sources light coming from space. However the light emanating from relatively close, so ‘large’ objects (sun, moon, planets…), overwhelms the hurdle without any problem. It’s a whole different story for the light coming from far-away objects like stars, creating pin-point beams. Since the beam is smaller with fewer photons, we will tend to notice their diffraction and scattering a lot more, causing the light to rapidly and temporarily shift color and brightness. We call it stellar scintillation. It has actually been observed and studied since the dawn of human kind, but recent research has found that stellar scintillation is not only a change in apparent brightness and color of a star, but also position.
In this video I wanted to showcase the stellar scintillation of some of brightest stars in the northern hemisphere in a ver different way. There exist some real-time videos of Vega lying around on the internet, but these are usually taken when stars are in focus. In order to increase the apparent area of a star, I needed to manually open up the aperture to its maximum at get an out-of-focus frame. The colors would then be more obvious, but several technical problems arose. The more out-of-focus the star was, the less ‘concentrated’ it light was, so the more I would have to compensate by increasing the ISO and reducing the shutter. However I realized on the spot that increasing my shutter speed would actually worsen the frame, since the scintillations were very often extremely quick and ephemeral. I had to keep a shutter speed between 1/15’’ and 1/30’’ to keep colors and details while still taking advantage of the maximum of light I could gather. I would also need the longest focal length lens I had with the widest aperture, so I after some test I decided to use the Samyang 135mm f/2, at f/2. While trying to get a decent sized bead in the frame, I necessarily had to bump up my ISO to at least 16,000 to get proper light, but that eventually caused some noise issue. After numerous tests and adjustments, these scenes were the best I could get out of cameras, lenses and time-being. Out of these very technical shots, I was amazed at what I was seeing. I had never seen in so much detail the frozen ‘facets’ of twinkling stars, the fleeting evidence of light diffraction by our atmosphere. The successive marble-like dots changed in brightness and colors, although it was very difficult to verify the change in position (maybe too small to see). Very hot stars like Vega or Sirius emit blue light, because their whole emission spectrum is ‘dragged’ towards the shorter wavelengths of visible (blue, violet) and invisible (UV). You can still see other colors and even some occasional ‘rainbows’ that remind you that our atmosphere actually act like a prism. Cooler stars like Betelgeuse or the group of stars Capella emit yellower or redder light, and their scintillation will have an overall red tint. Betelgeuse would be the most luminous star in the night sky if we were able to see all its radiations, but take a close look at its fluctuations: from sometimes invisible to extremely bright red, green or yellow, taken with exactly the same settings as the others, and its area is considerably smaller than the other 3 stars showcased. It’s the one-of-its-kind star that has the biggest fluctuations! Sirius is the brightest star in all our night sky and its fluctuations seemed fewer than the other stars (however low in elevation it was when I took the shot: 25°), maybe because of its ‘close’ distance to Earth. However it was the easiest star to shoot, because it emits so much light!I hope you liked this video that shed some novel light (pun intended) on stellar scintillation, and that it will encourage you to go outside and spend some time stargazing, because the possibilities are endless! I will gladly provide a more detailed list of gear and processing techniques upon request.
Last edited by Adrien Mauduit on Mon Dec 04, 2017 9:49 am, edited 3 times in total.

Adrien Mauduit
Ensign
Posts: 67
Joined: Thu Dec 15, 2016 10:58 pm

Re: Video Submissions

Postby Adrien Mauduit » Mon Dec 04, 2017 9:47 am

Fall skies of La Palma

Credits: Adrien Mauduit



Four and a half hours a day… That’s how long I have slept each day for ten days. Why would I bother being deprived of vital sleep though? Because my mission and goal was to show the night sky in a different way. The second opus of my sequel ‘Galaxies’ aims at finding new techniques and skills to bring the beauties of the cosmos to the general public, and in this optic, I went to spend a bit more than a week in a privileged place: a dark sky reserve. La Palma is located in the Canary Islands, just a few hundreds kilometers west of northern Africa. Its climate and location enable professional and amateur astronomers to gaze at the stars almost year round in a very little light polluted sky. In fact, the cooperation of more than 19 countries in building a giant observatory site on top of its volcano at 2400m is no surprise, because the skies are drier, purer and darker up there. Having shot on top El Teide in Tenerife, the neighbor island two years before (vimeo.com/163680035), I thought it was the perfect place to go shoot the wonders of the winter night sky. Tenerife also possesses decent skies and opportunities to gaze at the core of the milky way, but when your goal is to observe and capture fainter deep-sky red glows, you need a less polluted and bright atmosphere. That’s why I embarked for an epic and restless astro-adventure on Canary’s darkest island.

Epic and restless, because the goal was to spend all night shooting. So have I done. Every evening I would drive one and a half hours from sea level to 2400m of altitude along the dangerously winding coastal roads to arrive at the top El Roque de Los Muchachos, the volcano. The air is very thin and chilly up there, not to mention the constant wind gusts, making any kind of portable time-lapse astrophotography challenging. I would start shooting from dusk till dawn in the dry cold air, and rest in my rental car while my cameras are shooting. At the break of dawn, I would drive down to my holiday condo and sleep for about 4-5 hours. I needed to get back up, because no matter how much I planned the trip before hand using google Earth to find good shooting spots, you need to scout during the day, otherwise you won’t get a chance to see anything. If you don’t know what dark is, I advise you to get up there. It is so dark because of the basaltic rocks, that almost none of my sequences are taken below ISO 6400 and 10 seconds of exposure, no matter what the focal length. You need all the light you can gather! However the real challenge of an astrolapser is the adapt to the local conditions: if the wind picks up, you need to lower your shutter speed to avoid jitter as much as possible, meaning you will have to compensate in any other way. This game of fine manipulation is what makes your astrolapse look good, or horrendous. There is no in between. The slightest slip-up, and you could see the result of a long energy and time investment go to waste (I did have to delete all of my first night’s captures because of misjudgment…). Practice makes perfect, especially within this novel field of astrolapse. I wanted to use narrower angles, astro-modified cameras and contrast filters to reveal the light and colors of nebulae and gas clouds that the winter sky is strewed with. In this short film that also includes day-time sequences of my unforgettable journey around the island, I wanted to feature some of these deep-sky scenes, as a test.

The main goal of this short film was showing La Palma under its Fall skies. It was also the occasion for me to use motion control tools for the first time (Yes, it was about time). I used the Vixen Polarie to track the deep sky sequences to get maximum details and sharpness. I also used the Syrp tilt and pan bracket system for wider angle shots. To increase contrasts at angles higher than 14mm, I used the Pure Night filter by Lonely Speck. Camera wise, I used the Canon 6D Baader modified to reveal the H-alpha emission nebulae, the Sony a7s (other night shots), and the Sony a7rII (day shots). From the 1% young crescent moon setting to the blood reds of Barnard’s loop, I tried getting a maximum of interesting and innovative shots. I am sure you can spot countless meteors (Leonids, Taurids and others). Also, some multicolor airglow and dust clouds from the Sahara were rampant and usually add a lot of haze and colors to some frames. On the tracked deep-sky sequences, you can also notice loads of satellites, and these are geo-synchronous ones that stay in synch with the Earth’s orbit! In some wide-angle shots, you can probably spot the famous zodiacal lights too.
These were the main goals for me, and I believe these objects have rarely been photographed in that way before, but unlike what you might think, it is possible with nowadays technology, and is very relevant as this test suggests! I will gladly provide a more detailed list of gear and processing techniques upon request.
 Enjoy this short!

Adrien Mauduit
Ensign
Posts: 67
Joined: Thu Dec 15, 2016 10:58 pm

Re: Video Submissions

Postby Adrien Mauduit » Mon Dec 04, 2017 9:50 am

Orion Rising

Credits: Adrien Mauduit

https://www.youtube.com/watch?v=9sREtfgxcBs&t=4s

After spending a full night under the stars in the Swiss Alps at the Emosson Dam on October 26th, I came home with a lot of sequence that will be featured in my next big release 'Galaxies Vol II' coming next spring.

I really wanted to put the emphasis on Orion, as it is a bit detached from our own milky way center per se, but it offers visible features at mid-narrow angles (85 and 135mm) caught extremely well here with my Baader modded Canon 6D and Samyang 135mm, taking advantage of the astro-modification to see Barnard's loop and the Lambda Orionis. Shooting in extremely high light pollution, I used Lonely Speck's Pure night filter to increase contrast in the nebulosity, failing which I would have gotten these results. Look at how sharp and detailed the images look, especially when tracked with the Vixen Polarie.
I really wanted to capture the nebula rising from a mountain and show so much nebulosity and details in just single shots, as it has never been shown before on the internet. On some other scenes, you can also see some Orionid meteors which is still on-going.
The damn is extremely well situated and offers a 180 view on Mont Blanc, Europe's highest peak culminating at 4810m. The white mountains offered a pristine view lit up by the first quarter moon setting, but the milky way and the Scutum part (as well as the Cygnus part) was still visible.

Adrien Mauduit
Ensign
Posts: 67
Joined: Thu Dec 15, 2016 10:58 pm

Re: Video Submissions

Postby Adrien Mauduit » Mon Dec 04, 2017 9:51 am

Rise

Credits: Adrien Mauduit



Following the mornings of October 17, 18 and 19th 2017, the crescent moon rose in a very unique manner. The 3% moon crescent got close (conjunction) to Mars, Venus and Zaniah on Oct. 18th in the Earth shine. I shot the scenes from Gex in the Jura mountains in France, giving me a good vantage point: the ballet of the astrological objects occurred right above the Alps from my perspective. Unfortunately I wasn't able to get the moon and the mountains together, even though I got a still shot. On the other hand, the sun rose right above the 'Dents Blanches' mountains in Switzerland, which name means 'white teeth' because of the jagged-edge shape of its ridges. While the sun is lifting off this sharp horizon, the peaks diffract the emerging sunlight in a very unusual way, offering a dazzling spectacle of sun rays, blue light, and beads, much like at the end of a total eclipse! At 500mm, you notice how much the sun rises further away to the west Each day. The sequences are not in order, but you can certainly see that on the 17th it rose right between the peaks, and on the 19th it was completely west of the mountain ridge! Notice the planes passing by to land in Geneva. They seem to fly in an atmosphere filled with fluff, pollen and dust shining in the sun! Certainly a rare show that could only be recorded from where I am at the period of the year and in these lenient October weather conditions!

I shot everything with the Sony a7rII + Sigma 150-500mm APO f/4-6.3

Adrien Mauduit
Ensign
Posts: 67
Joined: Thu Dec 15, 2016 10:58 pm

Re: Video Submissions

Postby Adrien Mauduit » Thu Dec 07, 2017 9:45 am

Orion: the Hunter

Credits: Adrien Mauduit



A strange rectangle formed by bright stars in the winter sky, with three aligned central stars, that’s no ordinary shape for a constellation! You’ve probably seen it on a winter night sortie. If you are in the northern Hemisphere, these stars tend to rise in the south east in the Fall and set in the south west in the Spring, and linger during cold and long hours throughout the winter darkness. It’s undoubtably Orion, one of the oldest and most recognizable constellations in the night sky. According to the Greek mythology, the constellation was given the name Orion because it resembles a hunter holding a bow, as a reference to the son of Poseidon (the sea God) and Euryale.

Orion is next to some very famous constellations and deep-sky objects like the Pleiades, the Hyades (Taurus), Monoceros (and the Rosette Nebula), the milky way, Lepus (to the south) and Gemini. Sirius- the brightest star in our night sky, can often been sighted along side Orion. Orion also contains some very bright stars delimiting the outer shape of the hour-glass: Rigel, Saiph, Betelgeuse and Bellatrix. In the center, its belt harbors Alnitak, Alnilam and Mintaka. The Orion area also holds a great deal of colors. Even though our eyes cannot pick them up, our cameras can. As the biggest stars end their lives in a gigantic cosmic burp spewing out tremendous amounts of hot gases containing several elements they have formed by nuclear fusion, the explosion (called a supernova) propels these gases outwards. Their color is a testament of their nature (ex: blue/green is oxygen, red/brown tends to be hydrogen). They slowly cool off and in some places they agglutinate again by gravity. When the pressure and temperature get high enough in these accretion zones, a nuclear fusion starts and gives birth to a new star: nebulae are in fact a star graveyard and a nursery at the same time! In the Orion region, a lot of these nebulae can be captured with a camera: The large Lambda Orionis cloud, the famous and extremely bright shell-like Orion nebula, the running-man nebula, the flame and horse head nebulae located near Orion’s belt, but also the Rosette nebula not too far from all that! Look at how bright and varied these hues are. 

The point of this educative and pedagogical video was also to push the limits of what single picture astrophotography can do. While most cameras cannot pick the H-alpha emissions (red glowing gasses), I used a camera capable of doing so because its CMOS sensor has been replaced by a filter that can allow a wider range of wavelengths in the reds. I also used a light pollution filter (Pure Night from Lonely Speck) to increase contrasts, as well as a tracker (Vixen Polarie) for the deep-sky scenes to increase sharpness and details. With this film (as well as some of my previous productions), I was eager to show that today’s technology allows us to show so much details and colors in the night sky. Of course it contains a lot more noise than a stacked deep-sky or wide-angle astrophograph, but the time-lapse technique can also use medium format and deep-sky to reveal the beauty of this part of the cosmos, and this novel time-lapse proves it! I used the Canon 6D Baader modded and Sony a7s, as well as range of lenses from 14mm to 300mm. I will be glad to give more precisions and details about the technique, post-processing and workflow upon request. 

In the mean time, the video also contains a myriad of hidden gems that only attentive viewers will see. You can definitely see birds, shooting stars, airglow, iridium flares, low-orbit satellites, but most impressive of all, geosynchronous satellites. The latter is a type of higher orbit satellites that hover approximately over the same point of the Earth. They are usually fixed against the night sky, but as some scenes are tracked, meaning the night sky is fixed this time, these satellites move with the Earth’s rotation. Watch closely how many they are and how they tend to ‘follow’ each other! That’s also why this type of time-lapse is relevant and a real marvel for star gazers!

Goudig
Ensign
Posts: 21
Joined: Fri Aug 23, 2013 9:42 pm

Re: Video Submissions

Postby Goudig » Sun Dec 10, 2017 6:01 pm

100 billions of suns and Comet 252/P Linear, a 360° Milky Way panoramic project
http://www.bastienfoucher.com
Copyright: Sabine Gloaguen - Bastien Foucher


Click to play embedded YouTube video.


From Chili to French Brittany, one and a half year shooting the milky way across the globe.

A bigger version of the picture is here : http://www.bastienfoucher.com/Astrophotographies/VoieLactee/i-x9VVf6K/O
A 360° interactive panoramic is here : https://www.facebook.com/BastienFoucherAstrophotographies/photos/a.1399251583631036.1073741836.1376978345858360/2017409468481908/?type=3&theater


Return to “The Observation Deck: Latest Sky Photography”

Who is online

Users browsing this forum: Ahrefs [Bot], Baidu [Spider], CommonCrawl [Bot], Yandex Browser and 2 guests