火星 月惑星研究会 関西支部

Mars Image 2006/01/21(UT)

David Arditti,Damian Peach
D.Arditti,D.Peach

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解説（安達）
　南半球中緯度以南は淡い霧に覆われている。北極方面の雲が明るく良く目立
っている。これらの様子はDamian Peachの画像で鮮明に記録されている。アル
ギレ(Argyre;30W,-50)の明るいのは盆地の地形にできた地形性の霧らしい様子
が記録されている。(reported by 2 observers)

The inside latitude of the southern hemisphere south is covered with a
light fog. The cloud of an Arctic district is bright and remarkable.
These appearances are clearly recorded by the image of Damian Peach.
As for Argyre (30W,-50) bright, the appearance that seems to be the
geographical features fog made geographical features in the basin is
recorded. 
(reported by 2 observers)
FROM Makoto Adachi
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Fairly good results on Mars last night
I think,considering the seeing was not
great and the planet is only 9.9" diameter. Solis Lacus is on the meridian and
blue clouds are visible over Memnonia and Argyre.

For the first time,I have made a precise calculation of the EFR of the D-K-D
Cassegrain plus 1.6x Powermate combination,based on measuring the size of Mars
in the frame,assuming a chip diagonal of 4.5 mm (from Sony/Philips data sheet)
and using the tabulated angular diameter of the planet. I was surprised that the
answer is as high as 59,EFL 15000mm. No wonder it's so hard to keep on the
chip. I had previously thought it was about f40.

(The formula is   F=206265d/theta


where F is the EFL in mm,d is the height of the image on the chip in mm,and
theta is the angular diameter in seconds of arc.)

[David Arditti: Edgware Middlesex HA8 5LW: United Kingdom]

ALPO-Japan Latest Mars Section	2006/01/22
	2006/01/20