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From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Newsgroups: sci.electronics.design
Subject: Re: OT: alien radio signals
Date: Wed, 27 Nov 2024 15:25:38 -0000 (UTC)
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Martin Brown <'''newspam'''@nonad.co.uk> wrote:
> On 27/11/2024 12:54, Liz Tuddenham wrote:
>> Bill Sloman <bill.sloman@ieee.org> wrote:
>> 
>>> On 27/11/2024 6:58 pm, Jan Panteltje wrote:
>>>> A 2.9 hr Periodic Radio Transient with an Optical Counterpart:
>>>> https://iopscience.iop.org/article/10.3847/2041-8213/ad890e
>>>> 
>>>> No good movies and music yet...(decoded that is)
>>>> But at least technical details such as frequency etc..
>>>> Some very peculiar.
>>> 
>>> A close-orbiting pair of white dwarf stars could be doing lots of
>>> peculiar stuff, without any help from aliens.
>> 
>> Would a cluster of three or more be stable?  If so:
>> 
>> Dit-dit-dit dah
>> Dit-dit-dit dah
>> Dit-dit-dit dah
>> 
>> or even:
>> dah-dit-dah-dit     dah-dah-dit-dah
> 
> 3 body problem remains unsolved and probably insoluble analytically 
> apart from a special case of fairly massive stars in mutual orbit and a 
> small mass at one of the two stable L4, L5 Lagrange points like the 
> Trojan asteroids locked in equilateral triangles with Jupiter and the sun.
> 
> https://en.wikipedia.org/wiki/Lagrange_point#Stability
> 
> Ultimately in the very long term it is thought that for three (or more) 
> bodies in general three of them will get close enough together at some 
> point that the smallest one gets expelled and the others will end up 
> more tightly bound together. Ovenden's conjecture also AFAIK still 
> unproven is that the gravitational dynamics will perturb their orbits in 
> such a way as to put off the evil day for as long as possible.
> 
> I can't find anything suitable online but it seemed like a very 
> reasonable way to explain Bode's law from first principles and the same 
> locked resonance patterns seen in other planetary moons. This is the 
> closest I've been able to dig up. Ovenden's conjecture gets and 
> honourable mention in A.E. Roy's 1970's book "Orbital Motion".
> 
> This comes closest:
> https://academic.oup.com/mnras/article/115/3/296/2603818
> 

Michael Ovenden was my celestial mechanics and galactic dynamics prof at
UBC. A great guy, whose hobby was teaching New Age workshops at Cold
Mountain Institute. (An odd name for a small barge floating in the harbor,
but I digress.)

Died pretty young, unfortunately. 

Cheers 

Phil Hobbs 

-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics