火星 月惑星研究会 関西支部 （最新）

ALPO-Japan Latest
Mars Image 2001/07/31

米山誠一,風本明,池村俊彦,Ed Grafton,新川勝仁,Mars Orbiter Camera

S.Yoneyama,A.Kazemoto,T.Ikemura,E.Grafton,M.Niikawa,MOC

解説（安達）

Used our web and International Mars Watch.

　ダストストームの淡くなってきた部分が、北極地方だけではなく３ヶ所見られましたシルチス（Syrtis Major;290°、+10°）の先端とチュレニー（Mare Tyrrhnum;260°、-10°）付近と、キンメリウム（Mare Cimmerium;230°、-20°）付近です。これら３ヶ所はいずれも高度の高い土地に相当します。今まで、ダストストームが覆っていたところがこのように淡くなるということは、この地方では少なくともダストストームがすいたい傾向にあることを示しています。
　ただ、今回注目されるのは、シルチスのすぐ北東部分にダストの明るい光斑が出現していることです。これが再び大きな大気の撹乱を起こす可能性もあり、注意が必要です。
　Ed Grafton氏の画像によれば、ソリス（Solis lacus;90°、-25°）付近に明るいダストストームを記録されています。この部分は、７月中ごろに観測されていた明るいダストストームがそのまま残ったものかあるいは、新しいものかははっきりしません。また、Ed Grafton氏の画像ではタルシス（Tharsis;120°、-10°）近辺の３つの山も暗斑にとらえられており、この部分ではダストストームが全体的に広く低くなってきていることを感じさせています。
Explanations M.Adachi
There are 3 faint dark places on Martian surface. 1st is top of the Syrtis Major. 2nd place is Mare Tyrrhenum.3rd place is Mare Cimmerium.
These are high land in any way. It seems that the dust storm declined on these region.
The bright dust storm spot appeared on Solis Lacus region.This is a clearly seen by Ed Grafton's image. Ed Grafton catched clearly Tharsis Monses.

Seiichi Yoneyama(200mm F4 Newton, Digital still camera NEC PICONA)

Seeing:3/5 Transp.:2/5
曇りの日とシーイングが極端に悪い日が続き、半月ぶりにまともな画像が得られました。今日は曇る直前に何とか20コマ撮影できました。
火星面の模様が薄っすらと見えています。砂嵐が収まり始めたのでしょうか。北極の雲と南極冠も見えています。
≪神奈川県横浜市　米山誠一≫
Akira Kazemoto(203mm Newton, Digital still camera NEC PICONA) 
シーイング　　5/10。
キムメリウム、ヘスペリア、シルチス北部、
アエテリアなどが見えている。
      ≪京都府久世郡　風本明≫
Toshihiko Ikemura (310mm Newton, Digital still camera NEC PICONA)
seeing 6/10
≪愛知県名古屋市　池村俊彦≫
Ed Grafton( ST6 CCD 14 inch f/11 Celestron SCT) 

Eyepiece Projection @ f/60
Seeing good 7/10, transparency excellent 9/10,
wind South at 5 MPH, nodew.
[Ed Grafton, Houston Texas]
Masahito Niikawa (280mm SC, Digital still camera Minolta DimageEx1500) 

Mars on Jul.31, 2001
Ls = 205.5, De =  +6.9, Dia = 17.1"

[IR1]
2001/07/31 13:20:56 (UT)
CM = 303.6
16 frames composite

[B1]
2001/07/31 13:31:58 (UT)
CM = 306.3
25 frames composite

[R1]
2001/07/31 13:48:00 (UT)
CM = 310.2
32 frames composite

Observer:Masahito Niikawa
Email:zba03198@bird.zero.ad.jp
Obs.site : Mozuhonmachi Sakai-City Osaka Japan
Telescope : C11 (SC) D=280mm fl=2800mm

Camera:Minolta DimageEx1500 Digital Camera taking lens removed
CCD:ICX205AL (Sony Monochrome CCD)


Blue Images
indicate [B]
Filter: B390 (360nm - 500nm)
Exposure :1/3 sec
Effective F No.: 36 (XP24mm Eyepiece Projection)

Near IR Images:
indicate [R]
Filter: R64 (640nm - 1000nm)
Exposure : 1/30 sec
Effective F No.: 36 (XP24mm Eyepiece Projection)

IR image
indicate [IR]
Filter: IR84 (840nm - 1000nm)
Exposure :1/3 sec
Effective F No.: 36 (XP24mm Eyepiece Projection)

Seeing = 7/10
Transparency = 2/6

Image Processing;
Enhanced with unsharp masking method.

Caption:
Hellespontus, Pandorae Fretum, Sinus Sabaeus are noted dark
through the dust cloud.

説明：
Hellespontus, Pandorae Fretum, Sinus Sabaeusがダスト雲を
通して暗く見える。
　　　　　　≪大阪府　堺市　新川勝仁≫

Mars Orbiter Camera
The wide angle cameras of the Mars Orbiter Camera (MOC) system onboard Mars Global Surveyor (MGS) are used every day to gather a global view of changes occurring in martian weather and surface frost patterns. Late in June 2001, as southern winter transitioned to spring, dust storm activity began to pick up as cold air from the south polar cap moved northward toward the warmer air at the martian equator. By early July, dust storms had popped up all over the planet, particularly throughout the southern hemisphere and in the Elysium/Amazonis regions of the northern hemisphere. Soon, the entire planet--except the south polar cap--was enshrouded in dust. Similar storms have occurred before. For example, the planet was obscured by dust when the Mariner 9, Mars 2, and Mars 3 spacecraft reached the planet in late 1971. The MGS MOC images showed the evolution of the 2001 great dust storm period. There was never a time when the entire planet was in the midst of a single storm. Several large storms would occur at the same time, and dust was kicked high into the atmosphere to cause much of the rest of the planet to be obscured. The dust storms largely subsided by late September 2001, but the atmosphere remained hazy into November of that year.The two pictures shown here come from the E05 (June 2001) and E06 (July 2001) subphases of the MGS MOC Extended Mission. The view from June shows the Tharsis volcanic region (left), Valles Marineris chasms (right) and the late winter south polar cap (bottom). The view from July shows the same regions, but most of the details are hidden by dust storms and haze.
South up South up Original image1380X1380 tif 4010kB



South up South up Original image2048X1536 jpg 1176kB

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