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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!weretis.net!feeder9.news.weretis.net!news.quux.org!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Phil Hobbs Newsgroups: sci.electronics.design Subject: Re: OT: alien radio signals Date: Wed, 27 Nov 2024 15:25:38 -0000 (UTC) Organization: A noiseless patient Spider Lines: 62 Message-ID: References: <1r3omf7.1kvz6ar1a2rcg0N%liz@poppyrecords.invalid.invalid> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Wed, 27 Nov 2024 16:25:38 +0100 (CET) Injection-Info: dont-email.me; posting-host="8b910871a06b877be07a210c040596f1"; logging-data="78878"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19ifBcpLBH4pLcS52hlUaKG" User-Agent: NewsTap/5.5 (iPhone/iPod Touch) Cancel-Lock: sha1:gMuLEPsCI4YSxokysbVoV2qTwc8= sha1:YmhdF+b+lK0bmY8/FkOHZrszu6A= Bytes: 3633 Martin Brown <'''newspam'''@nonad.co.uk> wrote: > On 27/11/2024 12:54, Liz Tuddenham wrote: >> Bill Sloman 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