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Mars Image 2018/06/23(UT)
佐々木一男
Christophe Pellier,Paul G. Abel,John Sussenbach,Christopher Go,Clyde Foster,Anthony Wesley,Damian Peach,Marc Delcroix,Kolovos Dimitris,Jean-Luc Dauvergne,Vlamir da Silva Junior,Paul Maxson
Christophe.P,P.Abel,J.Sussenbach,Christopher Go,K.Sasaki,C.Foster,Anthony.W,D.Peach,M.Delcroix,Kolovos,JL Dauvergne,V.da Silva Jr.,P.Maxson
解説（安達）/ Comment by Makoto Adachi
前日に見られたSolis Lacusの晴れ間は1日で狭くなっていった。晴れ間に向かってSPCから細いすき間ができているが、南極冠の
エッジの様子から見て、南極冠からの寒気の吹き出しの跡のように見える。
Christopher Go氏はSyrtis Majorの先端部に小さな3つのスポットを観測した。周囲のリング状のダストストームと合わせて印象的な
姿をしている。リング状のベルトができる原因は分からない。前日にBruce Macdonald氏がMare Sirenumの南に見つけた明るいダスト
ストームは一段と大きくなり。その姿をDamian Peach氏が記録した。ダストストームはこの位置から西の方に広がっている様子がわかる。
The sunny day of Solis Lacus seen on the previous day narrowed in one day. Although a narrow gap is formed from the SPC toward
the clearance,it looks like a trace of a cold air balloon from the SPC as seen from the edge of the SPC.
Mr. Christopher Go observed three small spots at the tip of Syrtis Major. Together with the surrounding ring-shaped dust storm,it has
an impressive shape. I do not know the cause of the ring shaped belt. The bright dust storm that Mr. Bruce Macdonald found south of Mare
Sirenum the day before was much bigger. Mr. Damian Peach recorded his appearance. The dust storm spreads to the west from this position.
（by １１ observations ;reported by Makoto Adachi)
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After a few days of major mail access and computer problems,I can send you images from the last days or weeks!
Here are my first four set of Mars images for the current apparition,showing the onset and developpment of major dust outbreaks over Solis Lacus,so the storm is really global now and not over at all.
This is probably the second occurrence of such an early spring global storm (at least in human history),
with the great 2001 storm. To the difference of this last one however,the start of activity did not begun in usual southern locations (such as Hellas/SPC in 2001)
but with a cross-equatorial dust event first lifted over Mare Acidalium on May 31th,wich is quite an interesting fact since usually those storm do not trigger global events.
[Christophe Pellier Bruz City,France]
Attached is an observation of a somewhat dusty Mars I made last night with Dr Hugh Sasse using the 20" Planewave Dall-Kirkham telescope at the University of Leicester Observatory.
Seeing wasn't great- around AIV for much of the time,but the strong salmon colour of the planet means that visually it seems less disturbed by poor seeing.
This is the first time I have seen Mars since the last apparition- the first thing that struck me was just how bright the planet was in the morning sky,
and how large it looked through the telescope even at x110! ON the disk we observed the following features:
- To the far south the SPC was bright white,but it's boundary did not seem to be uniform and smooth.
- Mare Erythraeum contained many interesting subtle spots and darker sections. Some thin brighter regions detected- possibly dust?
- Chris looked quite bright.
- Niliacus Lacus seen in the far north- looked as though there was some mist and haze on the far northern limb.
- A hint of Sinus Sabeus present near the prec. limb.
Alas seeing became completely unstable by 0100UT and we closed down the observatory- from the fields we were treated to a nice display of noctilucent clouds!
[Paul G. Abel:Leicester:United Kingdom]
Most of the visible hemisphere is covered by the dust storm.
[スセンバッハ:オランダ]
[John Sussenbach:Houten,Netherlands]
Seeing was fair this morning but I had to deal with some clouds and dew.
The dust storm seems to be settling down. Syrtis Major is slowly coming out.
Sinus Sabeaus is also slowly clearing up. Hellas seems to be still covered with dust.
Note the bright clouds close to the south pole. There seems to be a round hole on it
[Christopher Go : Cebu Philippines]
シーイングは相変わらず安定しません。
[K.Sasaki:Ohsaki-City Miyagi-Prefecture Japan]
≪宮城県大崎市 佐々木一男≫
Conditions were not particularly good,
but the general impression is that this region is now also being affected quite significantly by dust and contrast appears to be reduced.
[Clyde Foster:Centurion,South Africa]
two images of Mars from this morning in good seeing - one RGB and one IR 750nm longpass.
The dust has cleared some more compared to yesterday and so more surface features are visible.
One interesting change is the breakup of yesterdays dust at the tip of Syrtis Major,inside the crater Antoniadi.
On todays image this shows as several smaller discrete bright regions of dust.
[Anthony Wesley,Murrumbateman Australia]
≪アンソニ オーストラリア≫
Strong jetstream over Chile this morning meant poor seeing but it was easily good enough to see the massive new dust cloud that has erupted over Solis Lacus/Mare Sirenum.
Olympus Mons is very prominent (the dark spot above centre.)
[Damian Peach: Loudwater,Buckinghamshire,United Kingdom]
Under less favorable conditions than 2 days earlier,
images showing in lower resolution that the dust storm on Solis Lacus continued to spread (bright zone in the Southern hemisphere,close to the limb on the left).
Infrared image shows some details nonetheless,and a bluish cloud is visible on the limb close to South pole.
[Marc Delcroix Tournefeuille,France]
[Kolovos Dimitrios,Athens Greece]
[Jean-Luc Dauvergne:Paris France]
Dust storm covering most of the region of the Valles Marineris.
[Vlamir da Silva Junior : Sao Paulo,Brazil]
[ Paul Maxson:Surprise,Arizona,United States]
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