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Posts Made By: Damian Peach

February 17, 2005 09:59 PM Forum: CCD Imaging and Processing/Solar System

Saturn Ring Spokes...Probable Artifact

Posted By Damian Peach

Hi all,

Interesting. I 100% agree with Jim's original conclusion of dust problems. Lets me explain why:

We have two high res images of Saturn in visible light (the ATK image is basically a BW verison of the colour one in terms of recorded wavelengths) and the colour image shows nothing remotely resembling such features. Also look carfeully at the BW image - the darkening extends across ring A also. This would be highly unlikely in reality that a spoke feature would cross from B to A ring (since they are composed of different materials.) Jim himself admits the dust problems with the camera, and its likely caused buy the Planet steadily drifting in declination during the AVI run in relation to the dust mark.

With further regard to spokes, in 6 years as the Assisant Director for the BAA Saturn section, i have never recieved an image amatuer or professional that shows definate spoke features in the ring system. The only time ive ever seen them was in the Voyager movies and once in Pic du Midi images in 1997. It seriosuly makes me question the validity of many visual sightings, when *objective* high resolution imagery (in cases in the past during the same times as reported sightings) shows nothing of the kind.

A Saturnian mystery that remains i guess smile

Best Wishes

Damian

February 17, 2005 10:02 PM Forum: CCD Imaging and Processing/Solar System

Jupiter 2/16 Boring Side but with Perfect Seeing

Posted By Damian Peach

Hi Chris,

Good to see you posting images in here. Another great shot from your C8 with much detail. Jupiter is anything but boring in great seeing smile

Best Wishes

Damian

February 17, 2005 10:04 PM Forum: CCD Imaging and Processing/Solar System

Saturn: February 15, 2005

Posted By Damian Peach

Hi Ed,

Thats a nice shot, well processed with good colour.

Damian

February 18, 2005 07:08 PM Forum: CCD Imaging and Processing/Solar System

Saturn last week

Posted By Damian Peach

Hi Roland,

Thats a lovely shot for cooled CCD and comparable to excellent webcam images - and i know how much work it takes to produce them with cooled cameras.

400 images - now THAT is what you call S/N ratio - i cant imagine sending an image with just 400 frames from the ATK......maybe 4000 wink

I'm amazed at your image scale at F22 - only 220".

I used my SBIG ST-5c for years, but havent touched it since 2003. Got some very nice stuff with it though, when seeing was good using sub-frame mode.

I think anyone taking the reverse route from webcam to CCD would be in for a shock smile

Again, great work,

Damian




February 18, 2005 07:50 PM Forum: CCD Imaging and Processing/Solar System

Saturn Ring Spokes...Probable Artifact

Posted By Damian Peach

Hi guys,

I attach a cutout processed to actually enhance the large scale detail we are looking at here. The dark line clearly extends on to the A ring with an odd bright patch ahead of it.

I think what would be of great help would be if Jim could provide some guide as to how long the colour and BW images are separated in time. Otherwise, even if the feature was actually real it can never be confirmed and we could debate until blue in the face smile

Damian

May 24, 2005 02:08 AM Forum: CCD Imaging and Processing/Solar System

Jupiter, Sun and the Moon from May 19, 2005

Posted By Damian Peach

Hi Paul,

Your doing some really good work with that 4" apo. Good to see your C925 back in action. Lovely shots.

Best Wishes

Damian
(Back after a bit of a hiatus!.)

May 24, 2005 11:40 PM Forum: CCD Imaging and Processing/Solar System

A walk across the Mare Frigoris

Posted By Damian Peach

Hi Alan,

There is allot to be said for wider field work on the Moon such as this lovely mosiac. This far northern area is fascinating. W. Bond is nothing more than a ghostly outline. Scoresby is quite far north - would be worth a close look sometime.

Best Wishes

Damian

May 29, 2005 01:07 AM Forum: CCD Imaging and Processing/Solar System

Agnes Clerke

Posted By Damian Peach

Hi Jim,

Lovely shots. Posidonius looks dramatic...

Damian

May 30, 2005 11:40 PM Forum: CCD Imaging and Processing/Solar System

Posidonius to Clerke to Dawes

Posted By Damian Peach

Hi Jim,

Thats a great mosiac.

Damian

May 30, 2005 11:41 PM Forum: CCD Imaging and Processing/Solar System

Jupiter May 29, 2005

Posted By Damian Peach

Hi Paul,

Very nice shots. Nice to see your C925 has returned to health.

Best Wishes

Damian