Venus slowing down?

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Venus slowing down?

#1  Postby jerome » Feb 15, 2012 3:50 pm

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Re: Venus slowing down?

#2  Postby MacIver » Feb 16, 2012 12:12 am

I'd say that this is a measurement issue, but six and a half minutes is a pretty big discrepancy.
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Re: Venus slowing down?

#3  Postby CdesignProponentsist » Feb 16, 2012 12:30 am

If this is true, then Venus just had some MAJOR geological activity.
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Re: Venus slowing down?

#4  Postby Lance » Feb 16, 2012 2:14 am

It might be an ongoing phenomenon, changing regularly, but just now discovered. If so, the next few years will show further changes.

Occurs to me to wonder if there is a slight discrepancy between rotation time between crust and core of the planet. Perhaps they oscillate - the core going a little faster at first, and then the crust catching up, followed by the reverse. etc. If so, it implies an active geology.

Venus, of course, is tide locked - with the same side facing the sun all the time. But maybe there is a little oscillation there?
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Re: Venus slowing down?

#5  Postby jerome » Feb 16, 2012 12:52 pm

Makes sense Lance.

I wonder. Venus has a retrograde rotation of course, at -243.02 Earth days (sidereal) as I recall, giving a Venusian day (synodic rotation) of about 116 Earth days. As such 6.5 minutes a fairly small variation: but I'm not sure if the actual length of rotation would be relevant to the impact of any geological event. For example major tsunami/earthquake events like Japan 2011 can alter our wobble and rotational period, but by ,milliseconds, but would that be "scaled up" by the longer Venusian day?

Dunno. Odd coming from me, but I find it all rather disturbing -- I like to imagine a clockwork Newtonian solar system of regular and precise mechanistic motion, not some Velikosvkian catastrophic place subject to sudden fluctuations in how it all works! ;)

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Re: Venus slowing down?

#6  Postby Berthold » Mar 12, 2012 12:30 pm

Lance wrote:Venus, of course, is tide locked - with the same side facing the sun all the time.

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Re: Venus slowing down?

#7  Postby DavidMcC » Mar 12, 2012 12:44 pm

Lance wrote:
Venus, of course, is tide locked - with the same side facing the sun all the time. But maybe there is a little oscillation there?


I wouldn't call it locked, Lance:

http://en.wikipedia.org/wiki/Venus#Orbit_and_rotation

As a result of Venus's relatively long solar day, one Venusian year is about 1.92 Venusian days long.
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Re: Venus slowing down?

#8  Postby jamest » Mar 12, 2012 1:54 pm

Erroneous comment/question deleted.
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