• OT: alien radio signals

    From Jan Panteltje@21:1/5 to All on Wed Nov 27 07:58:27 2024
    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.

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  • From Bill Sloman@21:1/5 to Jan Panteltje on Wed Nov 27 23:28:28 2024
    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.

    --
    Bill Sloman, Sydney

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  • From Jan Panteltje@21:1/5 to bill.sloman@ieee.org on Wed Nov 27 12:50:29 2024
    On a sunny day (Wed, 27 Nov 2024 23:28:28 +1100) it happened Bill Sloman <bill.sloman@ieee.org> wrote in <vi739i$g2j$1@dont-email.me>:

    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.

    In fig 2a in just a few seconds and for just a few seconds. such a strong signal,
    Could be some sort of beam pointing our way from a rotating object indeed.

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  • From Liz Tuddenham@21:1/5 to Bill Sloman on Wed Nov 27 12:54:56 2024
    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

    --
    ~ Liz Tuddenham ~
    (Remove the ".invalid"s and add ".co.uk" to reply)
    www.poppyrecords.co.uk

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  • From Martin Brown@21:1/5 to Liz Tuddenham on Wed Nov 27 14:11:23 2024
    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

    --
    Martin Brown

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  • From Martin Brown@21:1/5 to Jan Panteltje on Wed Nov 27 13:53:18 2024
    On 27/11/2024 07:58, 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.

    It probably is something in a tight orbit around an M class star
    although how it manages to do what it does is an open question.

    Hopefully someone will point a really big scope with time resolved
    spectroscopy at it and get a better idea of the internal dynamics.
    Unusually broadband emission so it is a bit odd.

    It is likely some variant of SS433 or a white dwarf plus M class star
    binary but only time and better observations will tell. Linear polarised emissions means quite strong ordered magnetic fields and the temporal
    variation puts very tight bounds on how big it can be!

    Serendipitous discovery of weird objects usually involves a bit of new
    physics with any luck (a la pulsars original trace marked "LGM").

    --
    Martin Brown

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  • From Phil Hobbs@21:1/5 to Martin Brown on Wed Nov 27 15:25:38 2024
    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

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  • From Martin Brown@21:1/5 to Phil Hobbs on Wed Nov 27 17:08:11 2024
    On 27/11/2024 15:25, Phil Hobbs wrote:
    Martin Brown <'''newspam'''@nonad.co.uk> wrote:

    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.

    Yes before retirement - it was a shame. Do you remember the title of his
    paper making this conjecture that I am struggling to recall? I'm
    guessing it had a more anodyne name at the time of publication with
    Ovenden's conjecture what A.E. Roy called it later in his 1970's book.

    We had Donald Lynden Bell and Martin Rees for astrophysics.

    --
    Martin Brown

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  • From Phil Hobbs@21:1/5 to Martin Brown on Wed Nov 27 17:14:53 2024
    Martin Brown <'''newspam'''@nonad.co.uk> wrote:
    On 27/11/2024 15:25, Phil Hobbs wrote:
    Martin Brown <'''newspam'''@nonad.co.uk> wrote:

    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.

    Yes before retirement - it was a shame. Do you remember the title of his paper making this conjecture that I am struggling to recall? I'm
    guessing it had a more anodyne name at the time of publication with
    Ovenden's conjecture what A.E. Roy called it later in his 1970's book.

    Unfortunately not.

    We had Donald Lynden Bell and Martin Rees for astrophysics.

    Must have been great fun. It’s usually the guy who first figures something out who writes best about it—you have to have a clear simple concept to do that.

    Cheers

    Phil Hobbs



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

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