From: kst-u@mib.org
ernesto.alto@libero.it (rnesto) writes:
> Rick Jones wrote:
>
>>rnesto wrote:
>>> Sunshine on Titan has to be 1/100 of that we have on Earth, because
>>> Titan is 10 time farer than us from the Sun.
>>> So, the Huyghen after landing get on a light to get pictures.
>>
>>> But how Huyghens could take landscape pictures?
>>
>>Perhaps a more sensitive camera, or longer exposure times, or maybe
>>both.
>
> Sunshine on Tital woul be 1/100 with a sky without clouds. With the
> tick clouds I think on Titan there is just 1/10000 of our terrestrial
> sunshine.
That assumes the clouds block 99% of incoming sunlight. I have no
idea what the actual figure is, but my wild guess is that more gets
through than that.
Even assuming 99% blockage, it would still be about 40 times as bright
as full moonlight on Earth. That should be more than enough to take
pictures. (One reference says it was like photographing asphalt at
dusk.)
> Anyone could answer to these questions?
>
> Which hour was, in the Titan day, when Huygens took its pictures?
>
> Where was Saturn, in the Titan sky, in those hours?
I have no idea -- but since Titan's rotation is synchronous, the
position of Saturn in its sky doesn't depend significantly on the time
of day. (A "day" on Titan is just under 16 Earth days.)
> Is it possible to see Saturn from the Titan surface, even when it's in
> its sky?
The view of Saturn from Titan's surface (in visible light) should be
about as good as the view of Titan's surface from above its atmosphere
-- i.e., essentially none.
--
Keith Thompson (The_Other_Keith) kst-u@mib.org
San Diego Supercomputer Center <*>
We must do something. This is something. Therefore, we must do this.
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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