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Peter Drew

Yippee!

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At long last I've been able to cross off my lunar nemesis, the rille that runs along the floor of the Alpine Valley. Tonight, using a 16" SCT at around 400x I was finally able to see it conclusively. The conditions didn't seem specially good but there it was. I know that many have seen it with much smaller apertures but it has until tonight always alluded me.  :icon_biggrin: 

 

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Well done!  I've tried many times with my 8" newt but never managed it (I think I got it once but I don't know if to was just my imagination). I think the illumination needs to be just so.

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Congrats Peter. That's something I haven't seen visually. I tried many times some years ago with my old C11 on stiller nights than we get these days but to no avail. Ive imaged it with a Mak 180 though

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Ha ! Exactly my task tonight ! Tried here with an 8" Newt   .Should have been possible , but no show.The seeing and clarity were just amazing. At x240 I pulled out lots of detail. LeeB and I did the rille ( 1 k wide) in the 150 frac, but lighting was much lower with a shadow from the edge of the valley. I spent ages just on the terminator at x200 tonight . What views !

Nick.

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Congratulations! In my experience, I have found, like you, the spotting of the Alpine Valley's central rille, extremely difficult, comparable perhaps with spotting the Rima Messier. During the 17 years with an excellent 18" f / 4.5, looking at my notes, I could make out the Alpine rille just three times, and not in full length.  So, a really great success! (---Time  now for  an excellent vintage Single Malt?)

Stephan

 

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Nice one Jules :happy8: I have just come in from a very pleasing Lunar session. Not the best of conditions but still good enough.

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I was moon-gazing for an hour or so at sunset  with the 127mm maksutov, and the alpine valley was what I spent most time on. I didn't see the rille but will try for it with the vx14 some time.

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Cracking effort! I've yet to catch it in the 10" scope despite several attempts.

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Well done Peter, it's always pleasing to view something that has stumped you for ages.

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Excellent Peter - well done ! :icon_salut:

I'm very chuffed when I've managed to see this challenging feature with my 12" dob. I find the Pentax XW 5mm eyepiece (318x in this scope) wonderful for high resolution lunar observing and it's the 1st eyepiece I turn to when seeking these really challenging features.

 

 

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