金星 月惑星研究会 関西支部

Venus Image 2005/12/04(UT)

David Arditti,Nilde Sotera
D.Arditti,N.Sotera

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I managed to image Venus at sunset this evening in UV,UV plus an IR-block
filter,and IR.

Some nice EW banding is visible on the crescent in the UV. The pattern is
different to that which I recorded on my last session,Nov. 29,5 days ago.
More than 1 rotation period of Venus1s upper atmosphere has passed since
then,which is 4 days. I will put a side-by-side comparison on my website
later.

The addition of the IR block made the image fainter,so it did have some
effect,showing that the Baader UV filter is not that effectively IR-blocked
itself,and it also reduced the brightess of the ghosting I have been
experiencing in the UV videos. However,the stacked and sharpened result is
much the same as UV without the block,and the ghosting is not eliminated
though it is not visible in the final images. The IR-pass images as usual
are sharper,but bland.

A B&W modified Toucam was used with Baader filters. Each image is a stack of
1500 frames,30% oversampled. Frame rate is 10 f/s. Gain is at maximum and
shutter speed is 1/25s for UV,1/1500s for IR. 40% Gamma is used in the UV
capture,none in the IR. Processing in Registax 3.

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

Venus 2005/12/04 16:39:40 UT
  Telescope: Newton 178 mm f/5.5 homemade;
  EFL =8150 mm; eyepiece: Baader GO 12.5 mm;
  camera: Philips ToUcam Pro (740K); filter: Baader IR block.
  15 fps, exp. 1/50s. Seeing 5/10, transp 8/10
  500/2739 frames, 182s DivX-AVI.
  K3CCD (acquisition), Registax. 
 
[Nilde Sotera : Gela,Italy]

ALPO-Japan Latest Venus Section	2005/12/05
	2005/11/28