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Vallis Alpes and Cassini

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#1 RobDob

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Posted 18 February 2013 - 02:42 AM

Don't quite have the horsepower to crack the central rille, but the shadows played nicely. My usual Coolpix S6300 afocal through a 28mm Edmund RKE eyepiece.

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#2 RobDob

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Posted 18 February 2013 - 02:47 AM

Pic #2 ~two hrs. later, notice the Alpes shadows are now more defined.

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#3 rg55

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Posted 18 February 2013 - 12:18 PM

Nice! I can definitely see the shadows change.

#4 Scott Beith

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Posted 18 February 2013 - 06:55 PM

Very nice images!

#5 mikewirths

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Posted 18 February 2013 - 08:26 PM

Cool images Rob!!!

cheers
Mike

#6 mike174

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Posted 18 February 2013 - 09:58 PM

Rob,

Are those through your Z12 and are those single impages or many stacked? They look great.

Tnx,

Mike

#7 nirvanix

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Posted 18 February 2013 - 10:44 PM

Very nice pictures Rob. Just afocal at the dob?

I was looking for the Alpine rille as well tonight, but can't say with certainty I saw it. Maybe it's a day or two early in the lunar cycle to best see it? Plato was still a third in shadow, and the photos I've seen showing the rille also show Plato with very little shadow on its floor. I was using mag 250-300x but no luck.

#8 RobDob

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Posted 19 February 2013 - 01:41 AM

Thanks guys!

Mike174 and Nirvanix, yes they are just single afocal images through my Z12. But, it takes many tries holding my breath, keeping the dob nudged for optimum center field viewing and holding the camera as still as possible to get a good shot.

Out of about every 100 pics, only 5-10 pics are acceptable. Sort of a manual slow version of registax I suppose... no stacking, though...

Rob

#9 azure1961p

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Posted 19 February 2013 - 07:47 AM

Rob I do see detail on the A. Valley - a suggestion of the rille. Great work.

Pete

#10 NeilMac

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Posted 19 February 2013 - 11:08 AM

great pics !

#11 nirvanix

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Posted 19 February 2013 - 06:15 PM

I too see a suggestion of the rille in your pics, and I observed that myself last night but wasn't sure if that was it. I guess I was expecting to see it stand out a bit more like the fine photos available around the internet. It is a subtle feature. Wonder what the best night of the lunar cycle is for seeing it?

#12 RobDob

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Posted 19 February 2013 - 08:17 PM

Hmmm... Good eyes there, Pete and Nirvanix.

Zoomed in my best piccie and tweaked contrast and sharpness. Low and behold - there IS a hint of the central rille! I suspect it is sunlight reflected from the rille's high points/craterlets? It's pretty fuzzy though...

Rob

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#13 rookie

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Posted 19 February 2013 - 09:27 PM

Enjoyed your pictures, Rob. :)

#14 nirvanix

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Posted 19 February 2013 - 10:29 PM

Hmmm... Good eyes there, Pete and Nirvanix.

Zoomed in my best piccie and tweaked contrast and sharpness. Low and behold - there IS a hint of the central rille! I suspect it is sunlight reflected from the rille's high points/craterlets? It's pretty fuzzy though...

Rob


Nice one Rob, I'd say that's it. I saw those flecks of light, but at the eyepiece you don't get the impression of a trench like the photos I've seen. Possibly easier at another time in the lunar cycle like tonight when it's overcast :bawling:

#15 RobDob

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Posted 20 February 2013 - 02:53 AM

Had clouds here too, but they broke loose late this evening :) Woohoo! Snagged some more shots tonight, but just couldn't catch the rille :(. Too high of sun angle at this phase me thinks. Here's tonight's best:

Rob

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#16 nirvanix

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Posted 20 February 2013 - 08:01 AM

Oh that's interesting. So maybe we did catch it at the optimum time. I see that Plato has almost no shadow on its floor in this picture. Do you remember what your seeing conditions were the other night when you saw the
Rille? For me it was only moderate so perhaps in better seeing I'd be able to see more of the Rille.

#17 David Knisely

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Posted 20 February 2013 - 06:53 PM

I did a little processing (mostly adjusting the gamma) and sharpening of your image, so this might be just a hair better...

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#18 RobDob

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Posted 20 February 2013 - 08:34 PM

@Rookie - Thanks, glad you enjoyed the pics!

@Nirvanix - Yes, I remember the seeing here was pretty good but not perfect. Twinkly stars and some unsteadiness, but the moon was very high in the sky for some clean views.

@David - Thanks for the tweak! I'd say that's quite a few hairs better :).

Rob

#19 RobDob

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Posted 21 February 2013 - 03:19 AM

Tonight had good seeing, so I stepped up my game a little and used my 9mm Z-planetary eyepiece for more magnification. Was tricky with my camera afocally, it was like looking down a straw, and had to navigate around kidney beaning. But, eeked out a little more detail in the end. Was happy to suss out 2 craterlets in Plato :). So, next month my mission is to get that rille!

Rob

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#20 nirvanix

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Posted 21 February 2013 - 11:02 AM

Nice pic again. I had the dob out last night and got my best number of craterlets in Plato. I believe 6 of them with pretty good seeing, but no rille gravy last night. It's a game of shadows! :p

Good luck in next month's rille hunt.

#21 THEPLOUGH

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Posted 21 February 2013 - 07:43 PM

:bow: :bow: :bow: :waytogo:

#22 highfnum

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Posted 21 February 2013 - 08:49 PM

"Don't quite have the horsepower to crack the central rille"
aka known as alpine cleft
your scope list aperture is more than good enoug
i did this a while back with c11

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#23 highfnum

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Posted 21 February 2013 - 09:33 PM

this week with c11 and pg camelion

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#24 nirvanix

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Posted 21 February 2013 - 11:43 PM

Really nice highfnum! Could you give us some details on the pics? Single shot?

#25 highfnum

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Posted 22 February 2013 - 05:11 AM

Oh no not a single
First shot was dmk.as about 500 shots
Second was point grey 200 shots

I wll admit doing eyepiece projection is more of a challenge
I was judt making point that robdob has scopes large enough
To do the task






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