一見してシルチス(Syrtis major;290w,+10)の先端が非常に濃くなっているこ
とが分かるが、これは、シルチスが濃くなったのではなく、シルチスより南方
がダストのベールに覆われて淡くなったことが原因である。南半球が全体的に
ダストのベールに覆われていることが分かる。アエテリア(Aetheria;240W,+40)
の斑点とキンメリウム(Mare Cimmerium;220W,-20)はほんとは同じ暗さではない。
暗色模様としてはヘラス(Hellas;300W,-50)の中心にあるゼア(Zea;300W,-50)が
今年は濃く目立っている。アウソニア(Ausonia;250W,-50)の南部が濃くなって
いるのは南極冠の周りを取り巻くダークフリンジのせいだろう。

It finds that the top of the Syrtis major(290W,+10) becomes very darkly.
However,  as for this, Syrtis major didn't become dark. It is the
result which put the contrast of the image of that the southern side
than Syrits major became lighter. A southern hemisphere is a wide range
and is covered by dust veil from this phenomenon. The Aetheria(240W,+40)
dark pattern and  Mare Cimmerium(220W,-20) are not same
darkly.  However, thses dark matter seen to be same darkly.  The Zea
(300W,-50) which is in the center of the Hellas(300W,-50) is conspicuous
well this  year. The Ausonia(250W,-50) will be dark that dark fringe of
the SPC comes out.
M.Adachi
----------------------------------------------------------------------




Don Parker(16-in (41cm) Newtonian, ST9E CCD Camera)


MARS IMAGES   21 Apr., 2003

D.C. Parker, Coral Gables, FL. 16-in (41cm) Newtonian
ST9XE CCD Camera  Eyepiece Projection @ f/55.4
Integration Times:
LUMINANCE (RG610 Red Filter, 610-1100nm)       0.12s  22  images
RED   (CFW8C, 641nm central; BWHM 58nm)        0.29s  1 image
GREEN (CFW8C, 531nm central; BWHM 86nm)    0.48s  5 images
BLUE (CFW8C, 450nm central, BWHM 116nm)      2.00s  1 image
Images bias,flat and dark corrected.

Seeing good (6-7, Pickering). Transparency 3.5-4m with frequent clouds, haze.
Wind NNE 0-3 kts. Light dew. Altitude = 37-40 degrees.

SP Hood bright. Thin AM limb arc. Hellas dull with Zea Lacus visible.
Hyblaeus Extension broad, very dark. N. Alcyonius dark; Thoana P. faint.
Cerberus III and Euripus II visible. Osiridis Pr.-Moeris L. prominent.
[D.C. Parker Coral Gables, FL. U.S.A]





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