Contains:  Solar system body or event
Crisium's Dorsa, Guillermo Gonzalez

Crisium's Dorsa

Acquisition type: Lucky imaging
Crisium's Dorsa, Guillermo Gonzalez

Crisium's Dorsa

Acquisition type: Lucky imaging

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Description

This final version is a crop-out of a composition of 6 frames (version B). I think is better balanced from the photographic point of view. I wanted to have a large image to print out of Crisium and Cleomedes. Good night, even despite variable seeing, one of the first tests of the new mount.

The Dorsa turned out nicely, so these days I've been documenting myself a bit on them and I am daring to share it with the Astrobin community. Mare Crisium Dorsa (Oppel, Tetyaev, Harker, Termier) are quite visible with the light conditions of that night. Because of their very low height of about 100 m to 150 m as a maximum, they may only be seen under very low solar illumination. These wrinkle ridge systems run near the border, almost completely encircling it, inside the whole mare surface. If these ridges are observed in detail, it is found that their structure is not symmetrical. On one side, the slope from the broad bulge of the crest is very slight, whereas the other side is distinctly steeper, casting a shadow on the surrounding lava surface. The different slopes frequently, and repeatedly, switch from one side of the crest to the other so that the ridge appears somewhat like a twisted rope. In this Image, this is quite clear in the Dorsa Oppel and partially (because of the illumination ) in the Dorsa Harker.

The walls of the basin of the Crisium Maria have an average height of 3 km above the surrounding surface. But Promontorium Agarum (a “cape” at the southeastern end of the “Sea”) mountain peaks reach a height of about 3.5 km above the mare surface, the equivalent of the South Face of Mount Everest from the Base Camp.

The upper part of the Image is dominated by the Cleomedes Crater, and I was lucky to get a weak capture of the Cleomedes Rima.

(EDIT) Updated original versions with new versions after using (and learning the use) of TOPAZ AI Sharpen. I think that the difference is for the better.

CS, Guillermo

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Revisions

  • Crisium's Dorsa, Guillermo Gonzalez
    Original
  • Crisium's Dorsa, Guillermo Gonzalez
    C
  • Crisium's Dorsa, Guillermo Gonzalez
    D
  • Crisium's Dorsa, Guillermo Gonzalez
    E
  • Crisium's Dorsa, Guillermo Gonzalez
    F
  • Final
    Crisium's Dorsa, Guillermo Gonzalez
    G

C

Description: Larger Panorama

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D

Description: Tagged version

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E

Description: Moved by Astro Jim's comment (https://www.astrobin.com/2f55n2/#c594411) on the Dorsa formation and their relation with the weight and the existance of MASCOM on the Maria, I have looked for an image of the gravity distribution on the Crissium Maria from the Grail project (https://upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Crisium_basin_GRAIL_gravity.jpg/360px-Crisium_basin_GRAIL_gravity.jpg). Luckily the image had some reference craters to be able to map it over the initial image. The result shows how most of the Dorsa follow the mascom in the sea of crissium.

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F

Description: Version C updated with TOPAZ AI Sharpen

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G

Description: Updated original version with improved sharpening after using (and learning the use) of TOPAZ AI Sharpen. I think that the difference is for the better. It is quite appreciable in Cleomedes...

Uploaded: ...

Histogram

Crisium's Dorsa, Guillermo Gonzalez