grumble at wolfe comment made attached to guardianarticle

Gerry Quinn · 09 Feb 2011, 15:59 · from 2011-February.txt.gz

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From: gerryq at indigo.ie (Gerry Quinn)
Date: Wed, 9 Feb 2011 15:59:22 -0000
Subject: (urth) grumble at wolfe comment made attached to guardianarticle
References: <SNT123-W400DB386713A3D18B7614CCFEA0 at phx.gbl><4D51DA82.6010103 at verizon.net><AANLkTimQ4=4ST=cMrEf_kvvVJP7=ygPS1U=iBpDCBthx at mail.gmail.com><1D98E2C398854830BEB19325EE3A27DE@jill><AANLkTik4G0iA_uaY4w4WigfOjqcrMi0DD1Aeny0Bxf3E at mail.gmail.com><8AC6534E159C45C9B82792E595D233FD@jill>	<4D52272C.3010600 at io.com>	<AANLkTimO+KjhzHaW7iBMUFfXe-uw6Yu12CO2ot0opOOo at mail.gmail.com><1D44D6669EA441B78E6880BA3C756D6F@jill>
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Message-ID: <ED7B32A5DD134490883A57D774EA45F0@jill>


From: "Jeff Wilson" <jwilson at io.com>
> On 2/9/2011 6:26 AM, Gerry Quinn wrote:

>> I think horseshoes are a bit problematic. If you look at Cruithne's
>> orbit, its actual distance from Earth varies on a short scale with a
>> period of one year. Over a longer term, the average distance varies.
>> Since Cruithne's orbital period is one year, there's no room for
>> meaningful six-year conjunctions.
>
> That's because tiny Cruithne is too small to influence Earth in a 
> detectable way. Janus and Epimethius, however, are similar in mass and do 
> their thing in four years.

But their orbital period around Saturn is only 0.7 days... so those four 
years are equivalent to about 2000 years on Blue!

- Gerry Quinn

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