Another question regarding jupiter transits... Is there any perceived
black drop effect? (e.g. like you get with venus transiting the sun).
It turns out this is due to limb darkening, and I'm thinking that
jupiter
has a darkended limb, hence the black drop effect should occur.
But I must admit, I'm not an avid jupiter-moon-transit observer, hence
have not observed the event.
> -------- Original Message --------
> Subject: Re: [TAC] Moon/shadow transits of Jupiter last Thursday
> From: "Bob Jardine" <rljtac@yahoo.com>
> Date: Tue, July 27, 2004 8:10 am
> To: "The Astronomy Connection" <sf-bay-tac@seds.org>
>
> Steve,
>
> I have noticed the very same effect. The first time I saw it, I also
> thought it was the shadow at first. I think Callisto is much darker
> than the other moons, so it is much easier to see in transit, and I
> think it is the only one that is *easy* to see near Jupiter's meridian.
>
> BTW: IIRC, Callisto is also the one that exhibits the rarest events
> with Jupiter, and you may have observed one of the last ones for
> several years.
>
> Bob J.
>
> --- Steven Gottlieb <sgottlieb@telis.org> wrote:
> > When I was observing at the Sierra Buttes last Thursday at a public
> > star party and last night of the SF State astronomy class, there was
> > a
> > great shadow transit of Io (along the NEB) early in the evening. At
> > the same time, there was a transit of Callisto (further north but
> > initially at a similar longitude) and both the shadow of Io and
> > Callisto were both prominent. In fact, I assumed I was watching the
> > shadow of Callisto since it was so dark and sharply defined (several
> > people found Callisto more obvious than Io's shadow), but I realized
> > the next day using StarryNight Pro that Callisto's shadow transit did
> >
> > not begin until after Jupiter had set. In general, when I've
> > observed
> > satellite transits they often get lost by the time they transit
> > Jupiter's meridian, so I'm not sure what to make of the observation
> > of
> > Callisto?
> >
> > Steve Gottlieb
> >
> >
Received on Tue Jul 27 08:36:13 2004