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PostPosted: Sun May 07, 2017 8:02 pm 

Joined: Thu Dec 16, 2004 5:06 pm
Posts: 1109
Location: Hartlepool
Just wondering if anyone else has observed the albedo markings on Ganymede ?

I managed this once using my old C11 on a pristine night. I was gob smacked, but the markinngs stood well out. I took a quick sketch, which I may have posted but will do so again if anyone is interested. Or anyone elsy please post here. Rather like Mercury markings wise.

Yourrs Eddie

20x80 bins
127 SW Mk
Usual odds an sods

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PostPosted: Mon May 08, 2017 1:39 pm 

Joined: Mon Jan 18, 2010 9:25 am
Posts: 5335
Hi Eddie,
I never saw any with a very good 12.5 inch Dall Kirkham.

I used up to 750x and my usual 265x and higher.
1100x was tried but was empty magnification.
4,650mm focal length f/3.5/ f14.6.
All 4 discs were easily seen but no markings seen on any moon.

But other people have seen markings, and also have photos and images.

Best regards,

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