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Everything posted by astroman001
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Jupiter and Saturn 12th Dec 2020
astroman001 replied to astroman001's topic in Imaging - Widefield, Special Events and Comets
ED80 at prime focus so 600mm f/7.5 -
Keith, If you mean the strange left edge curved features, this is edge rind, a well known phenomena. It's caused by diffraction patterns from the optics. It's a real pain and hard to avoid. Google it. Peter
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Managed to get about 10 mins on Mars between the clouds. Only 12.9" diameter now. Some nice high altitude clouds on the terminator side. Elysium is very bright at lower left. Mare Cimmerium and Sinus Gomer prominent at centre. Peter
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Hi Craig, I have read somewhere that the edge rind stays the same size, so therefore looks worse on smaller disks. Peter
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A quicky Mars image in jittery seeing from between the clouds. It's getting much smaller now at only 13 arc secs diameter. Syrtis Major on show. Peter
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Looks like the dust storm is pretty much over now. Even in the Hellas Basin, there are normal details appearing again. SInus Sabaeus and Sinus Meridiani central in image. Horrible edge rind on bright limb again. Peter
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Thanks Darryl, yes not many new images or comments. Peter
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Mars November 4th 2020 - Skywatcher 200p
astroman001 replied to Vectoron's topic in Imaging - Planetary
Excellent result. Well done.- 8 replies
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Very impressive images. Well done Peter
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You are correct, the 'edge rind' is a diffraction pattern and even the best imagers get it. It is affected by seeing but don't worry, it's not anything you have done wrong. A lot of people use the smudge/blur tool in PS to reduce the effect. Peter
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An image from last night. The dust storm seems to have died down a lot, maybe some dust near Argyre region at 10-11 o'clock on the bright limb. Certainly Solis Lacus and Valles Marineris look back to normal. Mars looks much smaller now at 15.7" compared to 22.4" at opposition. Peter
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Here is my first attempt at a full 360 degree map of Mars from images taken this year. We have not had that many clear nights from the UK, so don't have that many images to choose from. I think it would be better with more images covering the 360 degs rather than having to use wider segments from each image. Not sure how to get better transition between segments. Any Winjupos experts out there have any ideas? Peter
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Despite strong gusts of wind and jetstream overhead, the attached image clearly shows the spreading dust storm on Mars. The dust is spilling over from the Solis Lacus region on the bright limb at 10 o'clock. I look forward to watching this storm develop and the active region rotates into view. Peter
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even better. Peter
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Lovely image, a nice natural feel to it. Peter
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Great set of images. Those light marks are the start of a dust storm that is now spilling over half the planet. Well captured. Peter
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Very nice, not over processed. Peter
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I have done a more sympathetic processing, less aggressive and I think it is a more pleasing result. I also used the auto colour balance in Registax to better effect rather than using levels in PS. The first image is the original one posted with the newer one below. Peter
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Hi Pete, thanks. I tend to do 10,000 image runs which is about 1.5 mins. So this is 6-7 runs de-rotated together. Peter
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Some great detail. Could boost colour saturation a bit I think. peter