火星 ALPO-Japan Latest
Mars Image 2018/06/28(UT)
Clyde Foster,Anthony Wesley,Paul G. Abel,David Arditti,Damian Peach,John Sussenbach,Paul Maxson
解説（安達）/ Comment by Makoto Adachi
南極冠からの冷気の吹き出しは今日もHellespontus付近で目立っており、Paul G. Abel氏は肉眼観測でその様子を記録している。
John Sussenbach氏はSyrtis Majorの上を横切るダストストームの姿を記録している。
Today as well as the 26th and 27th,remarkable clouds are recorded in Antarctica and the Arctic. The SPC is yellowish,but this white cloud
appears at a high altitude higher than the dust storm and appears white in each image.
The cold air blowing from the SPC is remarkable
in the vicinity of Hellespontus today,Mr. Paul G. Abel recorded the state by macroscopic observation.
The image of Damian Peach continues to capture the speech bubbles clearly from the SPC following the previous day. Also,the GIF file
comparing the simulated image and the captured image can clearly compare the pattern. Careful observation of this image shows that
the center of the dust storm is biased toward the southern hemisphere and the dust storm in the northern hemisphere is dimmed.
John Sussenbach records the appearance of a dust storm across Syrtis Major.
（by 9 observations ;reported by Makoto Adachi)
Image set from this morning,with conditions a bit improved.
Quite a lot of subtle features are visible in the IR image,and to a lesser extent in the R,possibly indicating structure in the dust.
S Meridiani and Margaritifer are still heavily obscured. Vallis Marineris can just be made out through the dust. There appears to be dust on the SPC.
I have increased the size of my template to accommodate the upcoming opposition- things could have been looking very different,
but it has been fascinating monitoring the dust storm.
[Clyde Foster:Centurion,South Africa]
≪神奈川県 横浜市 三品利郎≫[Toshirou.Mishina:Kanagawa Japan]
≪奈良県奈良市 荒川 毅≫[Tsuyoshi Arakawa:Nara Japan]
IR750nm longpass and RGB. Only the IR image shows much detail,the RGB image is mostly featureless.
An interesting limb (or terminator) projection is visible today,at lower right. I assume this is raised dust although I guess it may be high altitude cloud instead.
[Anthony Wesley,Murrumbateman Australia]
Attached is an observation of Mars I made with Jon Culshaw in Hampstead. We used a Meade 6 inch SCT with no star diagonal and although the planet was rather low down,seeing was around AIV with some steadier moments.
The most interesting things are what is not visible on the disk! Syrtis Major,the Hellas basin and Sinus Sabaeus should all have been visible but instead there was only a vague dark patch to the far south which might be Hellespontus (although I am far from certain!) The southern polar cap was harder to see and there also seemed to be a bright white haze to the far north
[Paul G. Abel:Leicester:United Kingdom]
Seeing was better on the 28th.
I took a very similar longitude on the 29th (so that was a bit of a waste of time).
Clearly Sinus Meridiani is now visible.
It’s true however that IR images like this don’t represent the visual view accurately.
I couldn’t see Sinus M visually.
The dust scatters the long wavelength of the IR less,
and then there’s some sharpening applied; how much,
and so how visible to make the contrasts,is a matter of judgement.
But I try to maintain a consistent process from night to night.
[David Arditti: Edgware Middlesex HA8 5LW: United Kingdom]
≪茨城県 : 阿久津富夫≫
Some good seeing for this view. Once again the volcanoes across Tharsis are the only identifiable features.
Created a small animation showing the dust obscuration across the Tharsis region
using my June 28th data and the reference image of this hemisphere from MGS.
The volcanic peaks remain clear,and also a dark spot in Valles Marineris,
but little else ties up with known albedo markings,
especially the dark/light streaks (which also appear in other images.)
[Damian Peach: Loudwater,Buckinghamshire,United Kingdom]
[ Paul Maxson:Surprise,Arizona,United States]