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RobDob
sage


Reged: 04/10/10

Loc: Brentwood (East Bay Area), CA
Vallis Alpes and Cassini
      #5686378 - 02/18/13 02:42 AM Attachment (83 downloads)

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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RobDob
sage


Reged: 04/10/10

Loc: Brentwood (East Bay Area), CA
Re: Vallis Alpes and Cassini new [Re: RobDob]
      #5686383 - 02/18/13 02:47 AM Attachment (59 downloads)

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

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rg55
scholastic sledgehammer
*****

Reged: 08/02/08

Loc: western US
Re: Vallis Alpes and Cassini new [Re: RobDob]
      #5686897 - 02/18/13 12:18 PM

Nice! I can definitely see the shadows change.

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Scott BeithAdministrator
SRF
*****

Reged: 11/26/03

Loc: Frederick, MD
Re: Vallis Alpes and Cassini new [Re: rg55]
      #5687545 - 02/18/13 06:55 PM

Very nice images!

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mikewirths
Vendor-Baja Dark Skies
*****

Reged: 06/16/08

Loc: San Pedro Martir Mexico
Re: Vallis Alpes and Cassini new [Re: Scott Beith]
      #5687729 - 02/18/13 08:26 PM

Cool images Rob!!!

cheers
Mike


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mike174
scholastic sledgehammer


Reged: 01/04/05

Loc: Central, NJ
Re: Vallis Alpes and Cassini new [Re: mikewirths]
      #5687911 - 02/18/13 09:58 PM

Rob,

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

Tnx,

Mike


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nirvanix
Carpal Tunnel


Reged: 06/07/07

Loc: Saskatoon, SK
Re: Vallis Alpes and Cassini new [Re: mike174]
      #5687992 - 02/18/13 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.


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RobDob
sage


Reged: 04/10/10

Loc: Brentwood (East Bay Area), CA
Re: Vallis Alpes and Cassini new [Re: nirvanix]
      #5688187 - 02/19/13 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


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azure1961p
Postmaster
*****

Reged: 01/17/09

Loc: USA
Re: Vallis Alpes and Cassini new [Re: RobDob]
      #5688415 - 02/19/13 07:47 AM

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

Pete


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NeilMac
Carpal Tunnel


Reged: 09/25/10

Loc: MedHat, AB, Canada
Re: Vallis Alpes and Cassini new [Re: azure1961p]
      #5688666 - 02/19/13 11:08 AM

great pics !

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nirvanix
Carpal Tunnel


Reged: 06/07/07

Loc: Saskatoon, SK
Re: Vallis Alpes and Cassini new [Re: NeilMac]
      #5689427 - 02/19/13 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?

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RobDob
sage


Reged: 04/10/10

Loc: Brentwood (East Bay Area), CA
Re: Vallis Alpes and Cassini new [Re: nirvanix]
      #5689652 - 02/19/13 08:17 PM Attachment (20 downloads)

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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rookie
Good Night Nurse
*****

Reged: 01/14/06

Loc: St. Petersburg, FL
Re: Vallis Alpes and Cassini new [Re: RobDob]
      #5689758 - 02/19/13 09:27 PM

Enjoyed your pictures, Rob.

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nirvanix
Carpal Tunnel


Reged: 06/07/07

Loc: Saskatoon, SK
Re: Vallis Alpes and Cassini new [Re: RobDob]
      #5689871 - 02/19/13 10:29 PM

Quote:

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


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RobDob
sage


Reged: 04/10/10

Loc: Brentwood (East Bay Area), CA
Re: Vallis Alpes and Cassini new [Re: nirvanix]
      #5690145 - 02/20/13 02:53 AM Attachment (17 downloads)

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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nirvanix
Carpal Tunnel


Reged: 06/07/07

Loc: Saskatoon, SK
Re: Vallis Alpes and Cassini new [Re: RobDob]
      #5690323 - 02/20/13 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.


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David Knisely
Postmaster
*****

Reged: 04/19/04

Loc: southeastern Nebraska
Re: Vallis Alpes and Cassini new [Re: RobDob]
      #5691537 - 02/20/13 06:53 PM Attachment (20 downloads)

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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RobDob
sage


Reged: 04/10/10

Loc: Brentwood (East Bay Area), CA
Re: Vallis Alpes and Cassini new [Re: David Knisely]
      #5691717 - 02/20/13 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

Edited by RobDob (02/20/13 09:20 PM)


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RobDob
sage


Reged: 04/10/10

Loc: Brentwood (East Bay Area), CA
Re: Vallis Alpes and Cassini new [Re: RobDob]
      #5692163 - 02/21/13 03:19 AM Attachment (17 downloads)

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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nirvanix
Carpal Tunnel


Reged: 06/07/07

Loc: Saskatoon, SK
Re: Vallis Alpes and Cassini new [Re: RobDob]
      #5692528 - 02/21/13 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!

Good luck in next month's rille hunt.


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THEPLOUGH
ELEVEN Grandchildren; FIVE Ducklings
*****

Reged: 01/11/08

Loc: Carlisle, Cumbria, ENGLAND
Re: Vallis Alpes and Cassini new [Re: nirvanix]
      #5693410 - 02/21/13 07:43 PM



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highfnum
Carpal Tunnel
*****

Reged: 09/06/06

Loc: NE USA
Re: Vallis Alpes and Cassini new [Re: nirvanix]
      #5693532 - 02/21/13 08:49 PM Attachment (13 downloads)

"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

Edited by highfnum (02/21/13 08:55 PM)


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highfnum
Carpal Tunnel
*****

Reged: 09/06/06

Loc: NE USA
Re: Vallis Alpes and Cassini new [Re: highfnum]
      #5693604 - 02/21/13 09:33 PM Attachment (8 downloads)

this week with c11 and pg camelion

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nirvanix
Carpal Tunnel


Reged: 06/07/07

Loc: Saskatoon, SK
Re: Vallis Alpes and Cassini new [Re: highfnum]
      #5693784 - 02/21/13 11:43 PM

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

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highfnum
Carpal Tunnel
*****

Reged: 09/06/06

Loc: NE USA
Re: Vallis Alpes and Cassini new [Re: nirvanix]
      #5694036 - 02/22/13 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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azure1961p
Postmaster
*****

Reged: 01/17/09

Loc: USA
Re: Vallis Alpes and Cassini new [Re: highfnum]
      #5694276 - 02/22/13 09:32 AM

Beautiful image - the rille has gotten some fair if challenging exposure in this thread.

Pete


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photonovore
Moonatic
*****

Reged: 12/24/04

Loc: tacoma wa
Re: Vallis Alpes and Cassini new [Re: azure1961p]
      #5694319 - 02/22/13 09:49 AM

More "hint of a rille" with a 5" achromat...



I have also seen this rille captured with a 4"apo as well (Ron Bee?). It was also well known during the visual era, recorded (albeit always very inaccurately) by observers using the smaller (6inch) achromats popular in that era (late 19th century). the larger portions are ~600-700m width so what is really needed is good seeing (~1"ac) and an optimal sun angle.


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nirvanix
Carpal Tunnel


Reged: 06/07/07

Loc: Saskatoon, SK
Re: Vallis Alpes and Cassini new [Re: photonovore]
      #5694448 - 02/22/13 11:02 AM

Thanks highfnum and photonovore (feel like I'm speaking to the Vendecar high council or something ) for the info.

Requiring simultaneously good seeing and the right sun angle does make it a challenge indeed. The rille and Plato craterlets are fun things to do on the moon. I found I got a better craterlet count two days after getting a glance at the rille. Will try again next month if the cloud lords can bugger off.


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RobDob
sage


Reged: 04/10/10

Loc: Brentwood (East Bay Area), CA
Re: Vallis Alpes and Cassini new [Re: nirvanix]
      #5695562 - 02/22/13 08:21 PM

Thanks Highfnum and Mardi for the great pics! I have new hope for cracking the alpine cleft .

Rob


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RobDob
sage


Reged: 04/10/10

Loc: Brentwood (East Bay Area), CA
Re: Vallis Alpes and Cassini new [Re: nirvanix]
      #5695585 - 02/22/13 08:38 PM

Yeah, Nirvanix - Hopefully next month will bring us warmer spring like conditions and better seeing for rille gravy!

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RobertED
Post Laureate
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Reged: 07/11/03

Loc: Smithfield, RI
Re: Vallis Alpes and Cassini new [Re: RobDob]
      #5733983 - 03/15/13 11:57 AM

All are awesome photos!!

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