[AZ-Observing] Re: Ganymede's Oval Shadow
- From: Tom Polakis <tpolakis@xxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Sun, 4 Sep 2011 14:44:13 -0400
Yes that sounds more correct. Check out this Cassini image of Titan's shadow
on Saturn.
http://inapcache.boston.com/universal/site_graphics/blogs/bigpicture/cassini_05_21/s22_pia11648.jpg
The shadow becomes more distorted as it moves toward the terminator, even if
the terminator is directly below the observer.
Tom
---- ketelsen@xxxxxxxxxxxxxxxxx wrote:
> I think it also depends how far from opposition it is. If the earth were very
> close to the Jupiter-Sun line, it would appear round, even if it were near the
> limb.
>
> My late friend David Levine told me many times about an observation he
> made of a
> crescent shadow on Jupiter where the moon partially blocked it's own shadow on
> or very near opposition... Might be something to watch for as 29 October
> approaches.
>
> -Dean
>
> Quoting Tom Polakis <tpolakis@xxxxxxx>:
>
> > Yes, the shadow gets more distorted as it departs from the center of
> > the disc. The freeware that I use to simulate Jovian moons is
> > WinJupos, which is an amazing piece of work. It shows correct
> > renditions of shadows, and lined up with this one perfectly.
> >
> > Here's another example from Mike Salway in Australia. It shows the
> > changing shape in a time-lapse sequence.
> >
> > http://www.iceinspace.com.au/downloads/20070215-jupiter_anim.gif
> >
> > Tom
> >
> >
> > ---- stevecoe@xxxxxxxxxxxxxxxx wrote:
> >> Tom;
> >>
> >> It is indeed oval, I don't remember seeing that before. I watched a lot
> >> of shadow transits from my old backyard observatory and I remember them
> >> all being round. Of course I assume the reason is that it is near the
> >> limb of Jupiter.
> >>
> >
> > --
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> > send personal replies to the author, not the list.
>
>
>
> --
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