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Asbytec
Guy in a furry hat
*****

Reged: 08/08/07

Loc: La Union, PI
Re: Plato's challenge new [Re: nirvanix]
      #6367481 - 02/10/14 12:18 AM

Yea, collimation and cooling helped, without any doubt. Yea, I figured maybe just below 8/10 seeing other wise I am sure you would have nailed craters down to less than 1km. That opens up a bunch of them when the chance presents itself.

Transparency is interesting, I can tell a difference with Jupiter between descent and modest transparency. Of course, in the former it is also brighter affecting our perception. But, some thin humid overcast can affect Jove's softer contrast features, IME. At first, my own transparency was modest last night observing Plato with a noticeable haze around the moon. That cleared up in short order.

So, sure, transparency seems important even with lunar high contrast features (that are really low contrast on the focal plane when they are very small. Yea?) You just need that little extra contrast oomph to get the smallest ones, lessor transparency just get's in the way.

Rex, hey, what does the correlation mean? In your previous post you show "FEB 09 1412 RISING" as a good time, and above is adjusted to 1125UT. Does this mean the sun was at exactly the right angle - a sweet spot at 12 degrees - at that time instead of your earlier forecast? Or would 1412UT have been better?


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edosaurusrex
sage
*****

Reged: 01/30/07

Loc: Ft Worth, TX
Re: Plato's challenge new [Re: Asbytec]
      #6369109 - 02/10/14 07:15 PM

Norme,

There was nothing special about the 12 degree Sun elevation when I made the original table. I figured a day after terminator crossing at 1/2degree per hour (12 deg) would be a good time to start looking. Your report noted you saw "g" at around 1100UT, or 3 hours earlier, so I corrected the Sun elevation for the RISING condition to agree (correlate) with your observation.

Ed


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Asbytec
Guy in a furry hat
*****

Reged: 08/08/07

Loc: La Union, PI
Re: Plato's challenge new [Re: edosaurusrex]
      #6369154 - 02/10/14 07:40 PM

Rex, okay. Thank you.

Caught 'f' last night as a fleeting bright speck, but not in crater form. Seeing was such that 'e' was not held constantly.


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nirvanix
Carpal Tunnel


Reged: 06/07/07

Loc: Saskatoon, SK
Re: Plato's challenge new [Re: Asbytec]
      #6369312 - 02/10/14 08:48 PM

I'll be going out shortly to look for more craterlets! Temperature gauge says -23C, a heat wave! Maybe I'll skip the second layer of goose down.

Norme, I used to have the Orion Starmax 127mm. Great little scope, especially in the tropics I would imagine. The diurnal temperature profile for my locale is very desert like so the scope was always chasing equilibrium. That's the reason I sold it, no qualms with the scope itself.


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Asbytec
Guy in a furry hat
*****

Reged: 08/08/07

Loc: La Union, PI
Re: Plato's challenge new [Re: nirvanix]
      #6369329 - 02/10/14 08:59 PM

Nirv, understood. Yea, here in the tropics diurnal temps drop into the bone numbing 70's and tend to stay there. A Mak, any scope really, is in it's element.

Good luck, man. I'm hoping you can grab some smaller ones.


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azure1961p
Postmaster
*****

Reged: 01/17/09

Loc: USA
Re: Plato's challenge new [Re: nirvanix]
      #6369330 - 02/10/14 09:00 PM

Just to reiterate something here Norme - the smallish craters that are age old and worn will show a smaller shadow filled than a fresher crater with a well defined rim. Said another way, you might be able to see a smaller crate than you have if its fresh and better defined. Just some basalt for thought!

Pete


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mikewirths
Vendor-Baja Dark Skies
*****

Reged: 06/16/08

Loc: San Pedro Martir Mexico
Re: Plato's challenge new [Re: azure1961p]
      #6370300 - 02/11/14 11:53 AM

Hi all,

SO I decided to re-visit a Plato video sequence that had some superb seeing. This time I stacked almost half the sequence and it pulled out finer details in the floor of Plato. Perhaps imaging this one day earlier would have been better, and more image scale too.

still its my best so far! 18" Starmaster, ASi120MM camera

http://imageshack.com/a/img850/9484/7ya0.jpg

cheers

Mike


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nirvanix
Carpal Tunnel


Reged: 06/07/07

Loc: Saskatoon, SK
Re: Plato's challenge new [Re: mikewirths]
      #6370421 - 02/11/14 01:12 PM

Wow Mike! You've got the whole alphabet there. Beautiful shot.

There's a crater in your photo that doesn't have a letter attached to it (in some of the previous posts), but I'm pretty sure I visually spotted it last year. Ah, just looked it up: it's f. Ok, Norme I have spotted f last year!


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Asbytec
Guy in a furry hat
*****

Reged: 08/08/07

Loc: La Union, PI
Re: Plato's challenge new [Re: nirvanix]
      #6370451 - 02/11/14 01:23 PM

Nirv, good on you. In crater form, I bet?

Mike, that is a great shot. I like the way you can tell why 'h' is more difficult than 'g'.


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nirvanix
Carpal Tunnel


Reged: 06/07/07

Loc: Saskatoon, SK
Re: Plato's challenge new [Re: Asbytec]
      #6370500 - 02/11/14 01:56 PM

Quote:

Nirv, good on you. In crater form, I bet?





Yes indeed, and depending on the sun angle, it's easier to spot than g or h.

PS - Mike, I love Mons Pico in your photo. It looks like a snow covered mountain. One of my favorite lunar objects.


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moonnerd
super member


Reged: 12/18/08

Re: Plato's challenge new [Re: nirvanix]
      #6370955 - 02/11/14 06:47 PM

That photo is insane. Great work! Thanks for sharing with us.

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Asbytec
Guy in a furry hat
*****

Reged: 08/08/07

Loc: La Union, PI
Re: Plato's challenge new [Re: nirvanix]
      #6371308 - 02/11/14 10:15 PM

Quote:

Yes indeed, and depending on the sun angle, it's easier to spot than g or h.




You just amplified the challenge a lot.

I want 'f', too. If it's easier than 'g', hey...


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azure1961p
Postmaster
*****

Reged: 01/17/09

Loc: USA
Re: Plato's challenge new [Re: Asbytec]
      #6371883 - 02/12/14 09:39 AM

Insane indeed - this is a new level of res for amateur instruments.

Pete


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Sarkikos
Postmaster
*****

Reged: 12/18/07

Loc: Suburban Maryland, USA
Re: Plato's challenge new [Re: azure1961p]
      #6371920 - 02/12/14 09:56 AM

Pete,

We in the northeast will have to wait for better seeing ... and for the snow and ice to melt. Also, not too safe carrying my 10" Dob down porch steps and around the corner of my house in slippery conditions.

Mike


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Mare Nectaris
Carpal Tunnel
*****

Reged: 03/09/08

Loc: Toijala, Finland
Re: Plato's challenge new [Re: azure1961p]
      #6371921 - 02/12/14 09:56 AM

But remember - there is one reference for even the most eagle-eyed observers: Chuck Norris does not *see* craterlets on Plato; they *reveal* themselves to him.



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nirvanix
Carpal Tunnel


Reged: 06/07/07

Loc: Saskatoon, SK
Re: Plato's challenge new [Re: Sarkikos]
      #6371961 - 02/12/14 10:16 AM

Quote:

Pete,

We in the northeast will have to wait for better seeing ... and for the snow and ice to melt. Also, not too safe carrying my 10" Dob down porch steps and around the corner of my house in slippery conditions.

Mike




Mike, my entire backyard has been a 6 inch thick sheet of ice for months. I still carry the 10" dob down two steps and plop it out on the ice many nights. You can do it!

Chuck Norris doesn't even require averted vision, he scares everything in to revealing themselves.


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Sarkikos
Postmaster
*****

Reged: 12/18/07

Loc: Suburban Maryland, USA
Re: Plato's challenge [Re: nirvanix]
      #6371968 - 02/12/14 10:20 AM

No I can't. I'm not Chuck Norris.

Also, plop, plunk and plonk are not good for sensitive optical instruments!


Mike


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Rareth
member


Reged: 01/31/14

Loc: Rural Maryland
Re: Plato's challenge [Re: Sarkikos]
      #6372008 - 02/12/14 10:42 AM

Last night had some breaks in the clouds for Lunar Observations from MD., but of course with Brown due to deliver a new mount and tripod today....

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Sarkikos
Postmaster
*****

Reged: 12/18/07

Loc: Suburban Maryland, USA
Re: Plato's challenge [Re: Rareth]
      #6372038 - 02/12/14 10:53 AM

I don't think I'll be bringing out more than a 6" scope at home until Spring. But if the weather cooperates I will take my 10" Dob to a dark site during New Moon. It's actually safer dealing with heavy scopes there than at my house.

Mike


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NeilMac
Carpal Tunnel


Reged: 09/25/10

Loc: MedHat, AB, Canada
Re: Plato's challenge [Re: Sarkikos]
      #6372051 - 02/12/14 10:57 AM

Very nice detail.

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