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Lion Nebula SH2-132 - RC71

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Posts Made By: Alan Friedman

October 11, 2005 11:13 PM Forum: CCD Imaging and Processing/Solar System

mars before the rain

Posted By Alan Friedman
It seems that many locations have had poor seeing of late. Mine as well but the last five days of rain has given me nothing new to work on, so I've assembled an image from Oct 6th data that I might otherwise have abandoned for greener pastures. The cloud following Solis Lacus and bright limb haze were very
prominent on this morning, Nix Olympia a very subtle bump that might require averted imagination to spot. 8)

best,
Alan

October 14, 2005 01:30 PM Forum: CCD Imaging and Processing/Solar System

Re: Mars from last night

Posted By Alan Friedman
Hi Robert -

Beautiful work - one wouldn't guess such poor conditions!

Alan

October 19, 2005 03:00 PM Forum: CCD Imaging and Processing/Solar System

more pictures from the dust bowl

Posted By Alan Friedman
Very nice of the skies to open up for a few minutes to allow me a look at this beautitful show - a quickly processed image at f30 compared to an image from one month ago. I hope the streams shot at f45 will show a little more.

best,
Alan

October 21, 2005 03:39 PM Forum: CCD Imaging and Processing/Solar System

mars under construction

Posted By Alan Friedman
Had time to prepare only the red filtered image from this morning:

The transformation of albedo features was astounding and somewhat eerie at first look through the eyepiece.

Will have time to work on the color images later today I hope.

best,
Alan

October 22, 2005 11:22 PM Forum: CCD Imaging and Processing/Solar System

stormy mars final version

Posted By Alan Friedman
I had a chance to finish the color work on these images today and found that I had an image from Sept 13 which is closer to the CM of these than the Sept 18 image I used previously.

I enlarged the original images which were captured at f29 and f32 using a 2x A/P barlow. The seeing was fair to poor both nights, but they held up OK. The mustard color of the dust on the Oct 21 image was very surprising.

best,
Alan

October 28, 2005 06:33 PM Forum: CCD Imaging and Processing/Solar System

Re: Mars-Solis Lacus and Olympus Mons (good seeing

Posted By Alan Friedman
I like them both! - especially the one from 10/28. smile

great work -
Alan

October 29, 2005 08:51 PM Forum: CCD Imaging and Processing/Solar System

Re: What is the resolution of this image? (arc

Posted By Alan Friedman
Robert Heffner said:

What is the formula used to calculate resolution in arc seconds/pixel?


If you take an image that has not been resized in processing you can measure the number of pixels across the planet and divide by the size of mars in arc seconds (currently a convenient 20) to get the number of pixels per arc second, or divide the other way to get the fractional arcsecond/per pixel.

Photoshop has a ruler tool which, when the preference for measurements is set to pixels, will save you having to count.

best,
Alan

November 9, 2005 09:10 PM Forum: CCD Imaging and Processing/Solar System

Re: Some tiny images of Mars from late October....

Posted By Alan Friedman
Hi Robert -

The images are gorgeous, there is no reason they need to be larger. Can't wait to see the animation!

Alan

November 10, 2005 01:14 AM Forum: CCD Imaging and Processing/Solar System

Saturn - Halloween eve

Posted By Alan Friedman
A first saturn taken in (sigh) poor conditions - the Cassini division was almost invisible in the R, G and B streams, but just before dawn the seeing settled enough to capture a luminance stream in IR.

best -
Alan

November 14, 2005 03:08 PM Forum: CCD Imaging and Processing/Solar System

twenty second Mars

Posted By Alan Friedman
Hi all -

It turned out that I would only get one chance to image mars at its largest. I'm glad that I had this opportunity, even if the conditions left a lot to be desired. I will be a lot older and grayer the next time mars gets bigger than this.

cheers-
Alan


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