Hi,
Here are some images of the October 13 annular eclipse taken from Forest Gump Hill (not far away from Monument Valley) in Utah.
The weather was splendid: coronal sky, no wind, very little turbulence. Too bad the eclipse was only annular...
http://astrosurf.com/viladrich/astro/ec ... uleurs.jpg
http://astrosurf.com/viladrich/astro/ec ... -color.jpg
The relative motion of the lunar disk accross the solar disk makes it possible to scan the profile of the lunar limb with high resolution. I tried a reconstruct the limb profile by assembling successive images taken during contacts C2 and C3.
Here is the result in comparison to the profile of the limb calculated on the basis of Kaguya data:
http://astrosurf.com/viladrich/astro/ec ... ofiles.jpg
The correspondance near C3 is rather good. The limb profile was less bumpy near C3.
Here are some true color images, showing the darkening of the solar limb and also its brownish coler compared to the color of the solar disk center :
http://astrosurf.com/viladrich/astro/ec ... 0-u-wb.jpg
http://astrosurf.com/viladrich/astro/ec ... ap83-u.jpg
http://astrosurf.com/viladrich/astro/ec ... w-wb-u.jpg
http://astrosurf.com/viladrich/astro/ec ... w-wb-u.jpg
http://astrosurf.com/viladrich/astro/ec ... w-wb-u.jpg
The equipement used was a Sigma 150-600 mm f/6.3 lens with its 1.4x extender, a Nikon Z6 camera, an iOptron mount and Baader Astrosolar ND3.8 (up to about 15 min before C2) and ND 5 (afterward) :
http://astrosurf.com/viladrich/astro/ec ... -setup.jpg
Now waiting for the 2024 total eclipse ...
Clear skies !
Christian
October annular eclipse from Forest Gump Hill, Utah, USA
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October annular eclipse from Forest Gump Hill, Utah, USA
Christian Viladrich
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Re: October annular eclipse from Forest Gump Hill, Utah, USA
I really enjoyed these
The sand looks a super colour, I bet the scenery was lovely too. I'm surprised you haven't done a magnificent image like the APOD
Alexandra
The sand looks a super colour, I bet the scenery was lovely too. I'm surprised you haven't done a magnificent image like the APOD
Alexandra
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Re: October annular eclipse from Forest Gump Hill, Utah, USA
Those are terrific images!
I'm in the process of trying to make a profile image of the lunar limb as well - still experimenting with how to best isolate/stack the desired ROIs.
Kevin
I'm in the process of trying to make a profile image of the lunar limb as well - still experimenting with how to best isolate/stack the desired ROIs.
Kevin
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Re: October annular eclipse from Forest Gump Hill, Utah, USA
Thanks Alexandra and Kevin !
The landscape from Forest Gump Hill was beautiful. We could see Monument Valley to the South (I'll post a picture latter on).
We had a very interesting atmospheric phenomenum just before sunrise. A layer of strong turbulence was visible at the naked eye just over the horizon. Maybe some kind of wind shear ? Still, there was to wind on the ground. I should have tried to take some movies of it.
Kevin, it is probably worth experimenting a bit about the lunar limb "reconstruction". The images I used for this were 1s apart, but I'll try with images taken 0.5 s apart.
Maybe some change of coordinates is worth trying too (rectangular => polar).
The landscape from Forest Gump Hill was beautiful. We could see Monument Valley to the South (I'll post a picture latter on).
We had a very interesting atmospheric phenomenum just before sunrise. A layer of strong turbulence was visible at the naked eye just over the horizon. Maybe some kind of wind shear ? Still, there was to wind on the ground. I should have tried to take some movies of it.
Kevin, it is probably worth experimenting a bit about the lunar limb "reconstruction". The images I used for this were 1s apart, but I'll try with images taken 0.5 s apart.
Maybe some change of coordinates is worth trying too (rectangular => polar).
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
- KMH
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Re: October annular eclipse from Forest Gump Hill, Utah, USA
Am I correct in interpreting that your reconstruction only covers about 6 seconds, or are there more layers there than it looks like? I am working from within about 1 minute video segments (separate ones for C2 and C3), as the appearance of "beads" lasted somewhat longer for me. But, I was pretty near the northern limit for annularity. Hopefully I can work on it more today.christian viladrich wrote: ↑Thu Nov 02, 2023 7:46 pm
Kevin, it is probably worth experimenting a bit about the lunar limb "reconstruction". The images I used for this were 1s apart, but I'll try with images taken 0.5 s apart.
Maybe some change of coordinates is worth trying too (rectangular => polar).
Kevin
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Re: October annular eclipse from Forest Gump Hill, Utah, USA
Yes Kevin, the reconstruction covers about 6 s.KMH wrote: ↑Fri Nov 03, 2023 7:53 pm christian viladrich wrote: ↑Thu Nov 02, 2023 7:46 pm
Kevin, it is probably worth experimenting a bit about the lunar limb "reconstruction". The images I used for this were 1s apart, but I'll try with images taken 0.5 s apart.
Maybe some change of coordinates is worth trying too (rectangular => polar).
Am I correct in interpreting that your reconstruction only covers about 6 seconds, or are there more layers there than it looks like? I am working from within about 1 minute video segments (separate ones for C2 and C3), as the appearance of "beads" lasted somewhat longer for me. But, I was pretty near the northern limit for annularity. Hopefully I can work on it more today.
Kevin
I am planning to use 12 frames (instead of 6) at 0.5 s interval to "fill the gaps". Not sure whether it will be better or not.
The lunar limb moves at 0.25 arsec/s relative to the solar disk. So a 0.5s interval would be a 0.125 arsec shift of the lunar disk.
Christian Viladrich
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/
Co-author of "Planetary Astronomy"
http://planetary-astronomy.com/
Editor of "Solar Astronomy"
http://www.astronomiesolaire.com/