Mars 11th December 2020

[astroman001]

Managed to get about 10 mins on Mars between the clouds. Only 12.9" diameter now. Some nice high altitude clouds on the terminator side. Elysium is very bright at lower left. Mare Cimmerium and Sinus Gomer prominent at centre.

Peter

[Moonshed]

I know this is going to sound dumb but I have to ask. On some of my Mars images I have what I thought was a blurry edge to it, but seeing the same effect on yours I’m now wondering if instead it’s the Martian atmosphere because your image is otherwise perfectly sharp.

[astroman001]

Keith, If you mean the strange left edge curved features, this is edge rind, a well known phenomena. It's caused by diffraction patterns from the optics. It's a real pain and hard to avoid.

Google it.

Peter

[Moonshed]

10 hours ago, astroman001 said:

Keith, If you mean the strange left edge curved features, this is edge rind, a well known phenomena. It's caused by diffraction patterns from the optics. It's a real pain and hard to avoid.

Google it.

Peter

Hi Peter, thank you for that information, I was not aware of this phenomenon. As suggested I Googled it and found it to be very interesting, I will now return to my Mars raw data and try again because I put a lot of effort in trying to make the effect completely disappear. 

Edited December 15, 2020 by Moonshed