Venus Sequel #4 Orbit & Spin Dynamix

Discussion in 'Free Thoughts' started by NileQueen, Jun 22, 2003.

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  1. NileQueen Registered Senior Member

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    This thread is a "spin-off" of Explaining Venus. As there are many aspects of Venus to discuss, we can focus on Spin dynamix and Orbit in this thread.


    Andre:
    Right. But where is Venus in relation to earth at those coincident times? And in between it seems the planet is rotating.

    Okay I found sage's source
    http://www.nineplanets.org/venus.html
    "In addition, the periods of Venus' rotation and of its orbit are synchronized such that it always presents the same face toward Earth when the two planets are at their closest approach."
    So when they are NOT at the closest approach we might see a different view of the planet (if we could see the surface). Yes that is a noteworthy "coincidence".... Still don't have the parameters on how often they are closest to each other...

    *************
    Andre:
    ***************

    Here is a pretty good site I found on orbit of Venus in comparison to earth. Cool diagrams. Looks like a flower

    http://zebu.uoregon.edu/~soper/Orbits/venusorbit.html

    Please Register or Log in to view the hidden image!


    Here is the path of Venus relative to the earth over 8 Earth years (which is 13 Venus years).


    Spin & Precession
    I have found Jean-Luc Margot, at Caltech, who is studying our Venus. Take a look:

    "Planetary Interior Structure Revealed by Spin Dynamics
    The spin state of a planet depends on external torques as well as on the distribution of mass and dissipation mechanisms within the interior. Detailed measurements of the spin dynamics can therefore provide a wealth of information about planetary interior structure and about a variety of important geophysical processes. I have been implementing a new Earth-based radar technique (Holin, 1992) that provides spin state measurements with arcsecond accuracies. The first observations were designed to determine the size and state of Mercury's core and to get a handle on dissipation processes within the interior. The existence of a molten core would place fundamental constraints on the composition and rotation state of the planet at the time of formation, while a solid core would have a significant impact on our understanding of planetary magnetic fields. Click on the image for details about the Mercury experiment. Many insights in the geophysics of Venus can be gained by long term monitoring of its spin. Seasonal variations in the rotation rate may place fundamental constraints on its climate. Venus has a large wobble which could be excited by mantle convection, volcanic or seismic activity, resurfacing, or atmospheric changes. Measurements of the precession of the spin axis of Venus (of order one arcsecond per year) will yield a direct measurement of the polar moment of inertia. This work is performed in collaboration with S.J. Peale, R.F. Jurgens, M.A. Slade, and I.V. Holin. "
    http://www.gps.caltech.edu/~margot/


    A book on Venus
    http://www.uapress.arizona.edu/samples/sam1182.htm
    This is a link to a book, Venus II. It lists researchers and their area of study. This can be a resource for googling on their names to find further information on Venus.

    On Spin:

    http://www.oal.ul.pt/~acorreia/cvpubs/venus1.pdf
    Long term evolution of the spin of Venus I. Theory
    Alexandre C.M. Correia, Jacques Laskar, and Olivier NerĂ²n de Surgy

    http://www.oal.ul.pt/~acorreia/cvpubs/venus2.pdf
    Long term evolution of the spin of Venus II. Numerical Simulations
     
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  3. wet1 Wanderer Registered Senior Member

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    This is a cross post of the one in Astromony section. Please refrain from cross posting.
     
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