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PostPosted: Sun May 07, 2017 8:02 pm 
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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

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20x80 bins
127 SW Mk
Usual odds an sods


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PostPosted: Mon May 08, 2017 1:39 pm 
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Joined: Mon Jan 18, 2010 9:25 am
Posts: 5300
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,
David


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