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The Crater Clavius using Polar Projection with WinJUPOS

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#1 james7ca

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Posted 15 July 2019 - 12:55 PM

Taken on July 12 at just after 11PM PDT using a Celestron 9.25" EdgeHD (f/10) and a ZWO ASI178MM camera [with a Baader 610nm Longpass filter].

Capture done with Sharp Cap Pro, image processing with AutoStakkert! (best 20% of 6000 images), Registax, WinJUPOS, and Photoshop CC2019.

 

Since the crater Clavius is near to the southern pole of the moon it is usually seen foreshortened by our viewing position here on earth. Thus, in this image I have used WinJUPOS to create a polar projection of Clavius and its surrounding craters. Note in particular how the craters toward the bottom of the image (further south) appear nearly circular as if you were viewing them from directly overhead (which would only be possible when in a north/south orbit around the moon).

Attached Thumbnails

  • Polar Projection of Clavius with EdgeHD and ASI178MM .jpg

Edited by james7ca, 15 July 2019 - 11:55 PM.

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#2 james7ca

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Posted 15 July 2019 - 01:00 PM

Here is the standard view of Clavius that was used as the source for the polar projection. Same equipment and processing as in the first image (but without the perspective change done with WinJUPOS). This didn't have the same processing so there are sharpness and tonal differences that have nothing to do with the processing in WinJUPOS (this was a fairly quick "job" to show the differences between the two images).

 

The following link has some additional details on how this image was created:

 

  https://www.cloudyni...s/#entry9501421

Attached Thumbnails

  • Foreshortened Earth View of Clavius with EdgeHD and ASI178MM.jpg

Edited by james7ca, 15 July 2019 - 01:03 PM.

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#3 wargrafix

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Posted 15 July 2019 - 01:59 PM

Most impressive!

#4 james7ca

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Posted 15 July 2019 - 02:19 PM

Here is an image generated by the LROC Lunar Globe projection (based upon data from the Lunar Reconnaissance Orbiter Camera). You can compare the shapes of the features in this projection to the one I created using my EdgeHD. I've also labeled a few of the larger craters.

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  • LROC Lunar Globe.jpg


#5 Peregrinatum

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Posted 15 July 2019 - 03:44 PM

Excellent!

 

Did you capture at F10 or did you add a barlow?



#6 kevinbreen

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Posted 15 July 2019 - 07:37 PM

That’s fantastic

#7 jsmoraes

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Posted 15 July 2019 - 08:30 PM

very impressive use of WinJupos resource. I never tried it. Thank you for sharing informations about this powerfull ressource. Congratulations. Very well processed.



#8 james7ca

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Posted 15 July 2019 - 11:23 PM

wargrafix, Peregrinatum, Kevin, and jsmoraes thanks for the notice. Yes, this was done at f/10 (no barlow), that's close enough to critical sampling with a pixel size of 2.4 microns. However, I did forget to mention that I used a Baader 610nm Longpass filter (which makes the critical sampling even closer to optimum for f/10 and a pixel size of 2.4 microns).


Edited by james7ca, 16 July 2019 - 12:09 AM.



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