金星 ALPO-Japan Latest
Venus Image 2007/03/26(UT)
Christophe Pellier,Arnaud van Kranenbu,David Arditti
Kenkichi.Yunoki (260mm Newtonian)|
[Kenkichi Yunoki (Sakai City Japan)]
≪大阪府 堺市 柚木健吉≫
Good seeing on the 26th and again some interesting stuff.
This set does not confirm the presence of proeminent details in green light - or red (but that of the 27th will !). However,it's nice to note how visible in blue light are the UV markings. I have then intended a true color RGB image,approaching the human vision (a visual image with details !). Logically the dark markings appear with a pale yellow hue.
This adds credibility to some of the visual experiences of the past (I must also recall that on a last year photometric test,this B filter was found poorly transparent in near UV). But on the other hand,the images are much more contrasted than the human vision...
Note again some banding in near-IR.
[Christophe Pellier Bruz City,France]
Arnaud van Kranenburg(235mm SCT)|
235mm SCT (C9.25)
Seeing 4/10 Trans 8
De evening of 25 March was quite clear,but seeing was only fair due to a easterly wind which is almost alwas indicative for mediocre seeing. The transparancy was less than yesterday,but still quite good.
The charateristic V-shape was very prominent,this is the first time I have imaged it so clearly. I also experimented with other filters to get three distinct wavelength areas,380-470,400-470 and 420-470 nm,each show progressively less contrast. The markings are still clearly visible,showing that Venus' markings are also absorbing in the blue channel and can be seen visually.
[Arnaud van Kranenburg:Vlaardingen The Netherlands]
David Arditti (250mm Dall-Kirkham Cassegrain)|
[David Arditti: Edgware Middlesex HA8 5LW: United Kingdom]