2003 05 17 (Km) Note
Martian Images taken on 17 May 2003
at 19:01~19:17 GMT by Teruaki KUMAMORI.

  λ=186゚Ls,   (ω=126°W, 130°W,   φ=19°S),   δ=10.8",   ι=43°
  Seeing: 6/10. Transparency: 1/5

Use is made of a homemade 20 cm Dall-Kirkahm at f/28 equipped with a Philips ToUcam Pro.
A 1° wedge prism was employed to compensate the dispersion. Also an IR blocker is used.
Each image was made by stacking 1000 frames each taken with a 1/25 sec exposure.

Technical Note:
  Since the original B channel of the ToUcam colour image admits an intrusion of longer waves (>500mn) of G, we here provide, in place of B, another processed image B - 0.4G, that is made by subtracting 40% of G from the original ToUcam B ingredient.

Observing Note:
  The spc is bright definite with some shadowy area inside it. The dark markings are not well identified yet. The B -0.4G image shows a faint evening mist clearly (maybe at Tharsis).

Location: Sakai City, Osaka, Japan

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