Re: [Phys-L] Solar eclipse (by Phobos) as seen by Perserverence rover

[Todd Pedlar <pedlto01@luther.edu>]

Whoops!  I just now realized that was a video not a photo.   Even better!
I can give them the dimension that's parallel to the path and have them do
the same calculation ;)

On Fri, Apr 22, 2022 at 3:09 PM Todd Pedlar <pedlto01@luther.edu> wrote:

> who's propositioning the rover?  OH... you said PRE-positioning! :)
>
> Indeed.  That photo is going on a homework problem in the Fall, asking
> students to determine, assuming phobos is tracking horizontally across the
> image, a) the orbital distance of phobos given its dimensions and the
> diameter of the sun, and b) the length of eclipse in time given the result
> for part a and Newton's LUG.   I'll let them assume
> circular orbit (eccentricity is 0.015 so it's not that bad).  If I wanted
> to push it harder, I'd not let them assume circularity in calculating
> the length of the eclipse in time but make them use the actual eccentricity
> in doing the problem :)
>
> On Fri, Apr 22, 2022 at 12:26 PM David Bowman <
> David_Bowman@georgetowncollege.edu> wrote:
>
> > Here is a NASA video of an annular eclipse of the sun by Phobos as
> > recorded by the Perserverence rover on Mars.  It's a couple of days old.
> > That's some pretty impressive prepositioning of the rover to get that shot.
> >
> > https://youtu.be/aKK7vS2CHC8
> >
> > David Bowman
> > _______________________________________________
> > Forum for Physics Educators
> > Phys-l@mail.phys-l.org
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>
>
> --
> Todd K. Pedlar
> Professor of Physics and Physics Department Head
> Luther College, Decorah, IA
> pedlto01@luther.edu
> (563) 387-1628
> *Learner | Context | Strategic | Individualization | Achiever*


-- 
Todd K. Pedlar
Professor of Physics and Physics Department Head
Luther College, Decorah, IA
pedlto01@luther.edu
(563) 387-1628
*Learner | Context | Strategic | Individualization | Achiever*