1I/‘Oumuamua, The First known Interstellar Visitor - Matija Cuk & Meg Schwamb (SETI Talks 2018)
by the SETI Institute, published on Jan 24, 2018
https://www.youtube.com/watch?v=b_vAcv7JGhQ
* Skip to 08:45 if you just want the lecture
* Warning: very low audio, a sound amplifier might be necessary

A SETI Talk on 1I/`Oumuamua, the first known interstellar small body, possibly an asteroid which is probably coming from another planetary system. Its recent discovery by Pan-STARRS1 offers a rare opportunity to explore the planetary formation processes of other stars, and the effect of the interstellar environment on a planetesimal surface. Since its discovery, astronomers around the world have raced to use the most powerful ground-based and space-borne telescopes to collect information on its nature. Two astronomers, Meg Schwamb, astronomer at the Gemini Observatory in Hawaii and Matija Cuk, astronomer at the SETI Institute in Mountain View, will discuss the nature of 'Oumuamua, its color and shape in comparison with known small solar system bodies, as well as its origin derived from its extremely elongated shape and its orbit. They will show how its peculiarities seem to imply that 'Oumuamua is one of the most important discoveries of the decade in astronomy.

Matija Cuk is a Research Scientist at the SETI Institute. He received his Ph.D. degree from Cornell University in 2005. He uses computer simulations to study the past and present evolution of the orbits of the planets, moons and asteroids. His recent work focused on the origin of Earth's Moon, as well as the moons and rings of Saturn. In 2014 he was awarded the Harold Urey Prize for early career achievement from the Division of Planetary Sciences of the American Astronomical Society.

Meg Schwamb is an assistant scientist at the Gemini Observatory based in Hilo, Hawai'i. Meg's research focuses on how planets and their building blocks form and evolve, applying ground-based surveys to probe our Solar System's small body reservoirs. She is also involved in the Planet Four citizen science projects, which enlists the public to help study the seasonal processes of the Martian south pole and map the distribution of ridges on the Martian mid-latitudes. Meg also serves as co-chair of the Large Synoptic Survey Telescope's Solar System Science Collaboration. Meg was awarded the 2017 Carl Sagan Medal for Excellence in Public Communication in Planetary Science from the American Astronomical Society's Division for Planetary Science.

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Apr 3, 1999 - May 3, 2020

A relatively large body, tidally disrupted by passing close to its star, and the remains ejected from its system may explain Oumuamua. It seems to be assumed that such a planet-like body would have been forced inward toward the star by one or more interactions with other planets. Such interactions could occur in the early history of a star system's formation.

I'm skeptical, though, about the ability of a fragment with a highly elongated shape to survive intact, through the regime of tidal disruption, and especially the dense cloud of mutually impacting fragments to which such disruption would give rise. It seems that everything should have been scoured by these impacts to something approaching equal proportions of length, width, and height.

'Oumuamua had a violent past and has been tumbling around for billions of years - February 12, 2018
https://phys.org/news/2018-02-oumuamua-violent-billions-years.html

https://en.wikipedia.org/wiki/Pan-STARRS

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Apr 3, 1999 - May 3, 2020

The latest.

The mysterious, cigar-shaped object now called ’Oumuamua was found crossing the solar system last October by robotic telescopes on Hawaii. The trajectory showed it had come from another star system and was already on its way back into interstellar space. This sparked a race against time. Astronomers had just a week before it faded from view.

Identifying its home star system seemed like a hopeless task. Our galaxy contains hundreds of billions of stars. Now, however, a new study narrows things down a bit. It concludes that ’Oumuamua, meaning “scout” in Hawaiian, probably came from a binary star.

https://www.theguardian.com/science/across-the-universe/2018/mar/19/oumuamua-where-come-from-latest-update-two-star-system

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It concludes that ’Oumuamua, meaning “scout” in Hawaiian, probably came from a binary star.

Reading further on

Binary stars are systems in which two stars are in orbit around one another. Together with systems containing three or more stars, they make up about a third of the stars in the galaxy.

In other words it could have have come from anywhere in 1/3 of the galaxy, Or in other words, we are no further forward than before. Just an article by some guy flogging his book.

Typical Guardian short of copy.

Sorry the article disappointed you Chrs! :-(

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Designed to make the gullible look closer and get bombarded with paid for adverts on a web page.

Welcome to being monetized.

And it is also supposed to be a discovery as well.

Out for that of the usual thing, meaning a short tie-break.

Thank you. But at least I know that, the average oik in the street doesn't.

Failure of the schools to teach?

Perth scientists confirm suspicious object not alien.

The find triggered speculation Oumuamua, which is loosely translated from the Hawaiian as 'a messenger that reaches out from the distant past,' could be an alien spacecraft.

Cheers.

Wiggo, most of us know that the debunking process is not any good for science, in that we rather should turn the right cheek towards the fist, in order to be hit,
when it first could be the left one for the same.

https://en.wikipedia.org/wiki/Debunker

I could leave out one thing for another, including a couple of Myths, in that as usual an Oath should also be about that of a truth as well,
and therefore not any Conspiracy either.

Here again perhaps the same, but if perhaps rather debunking such a thing as Crop Circles, are you next debunking science for what it perhaps should be?

Pretentious (in the article) and here I had to look up the meaning of the word.

Answers welcome.

The observing records of the Murchison Wide Field Array were examined for the period when Oumuamua was nearest Earth. They were observing only in the highly limited frequency range of 72 to 102 MegaHertz. Its perfectly possible that if there were any artificial radio emissions from the object, that they occurred in some other frequency range.

We have no idea on which frequency supposed FT signal would occur. The 30 MegaHertz wide band used for their observations is only a fraction of one percent of the entire radio frequency range. It seems they stood a very good chance of missing any signal that might have been present.

Well, one thing is for sure, even if the object is some sort of a space ark, they weren't looking for us or a planet like ours.

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Bob DeWoody

My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events.

Study says it was a a comet after all.

https://www.usatoday.com/story/news/2018/06/27/oumuamua-comet-asteroid-cigar-shape/738636002/

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The possible disappointment is that we could be looking in vain for life on a visiting comet, except for no such thing as life in space either,
for that of interstellar space, if not any vacuum either.

But soon any excitement or thrill could vanish into that of science, which could sometimes be the Method of Proof, if not any disbelief either for a couple of things.

Tell me what is in the cup, and next only water, except for perhaps still coffee, except not any material from a white dwarf, or neutron star either.

Should a fix also be the same as a remedy, except for sometimes making it an accepted level for that of science, by also averaging it a little bit?

If perhaps still not ourselves for also the cock versus the hen, except not any Lynn either, I still could believe in the Universe for what it possibly might be,
except for still not any business of your ordinary day either.

Like sometimes point, for also "To the point", also pointless as well, in that it could be of no meaning.

We also could make it science in a similar way, and also pointless as well at times, for next a similar meaning.

I really would like to see Creation expressed by means of possible words, except for still no such thing as any Equation, for next also a couple of Laws,
which possibly could be telling about a couple of Truths as well.

https://en.wikipedia.org/wiki/Deed

https://en.wikipedia.org/wiki/Act

https://en.wikipedia.org/wiki/Will

Except for still not any Declaration either, which could be a confirmation, for next also Proof, regarding that of extraterrestrial intelligence.

Study says it was a a comet after all.

https://www.usatoday.com/story/news/2018/06/27/oumuamua-comet-asteroid-cigar-shape/738636002/

Their guess is as good as anybody's

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Bob DeWoody

My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events.

Using RTs to "listen" to asteroid bodies is not an unusual practice. Depending on the object's albedo, it is sometimes the most effective way to observe the object. A couple of years ago I wrote a short paper for UVA's grad Radio Astronomy course proposing that P-type asteroids be RT targets. This type of asteroid has a very low albedo, some as low as 0.04. This makes them nearly textbook "black body" radiators - meaning that for P-type asteroids 99% of incoming visible light is absorbed and re-radiated at other frequencies (like radio waves). The reports I read state that Oumuamua was estimated to have an albedo of 0 .10, meaning it has grey/black body characteristics.

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Except for still looking a bit ugly when next three links in a row.

Really, only because we could know that science may be only a shot in the dark at times.

The researchers who think that Oumuamua is a comet, and that this explains its otherwise-mysterious acceleration wrote a letter to the science journal Nature. In this letter, they admit that a number of assumptions are necessary, for this idea to work. They strike a much more tentative tone than most of the ordinary news articles, which trumpet the comet explanation as 'case closed'.

The astronomers say that several different substances, unusual in comets, would need to be present on Oumumamua, in order for outgassing to provide the observed acceleration.
I don't find this tentative chain of assumptions particularly convincing. An interstellar spacecraft would be a much more scientifically interesting possibility.

Please find a link, below, to the referenced letter to Nature:

http://www.spacetelescope.org/static/archives/releases/science_papers/heic1813/heic1813a.pdf

Comets have tails. I have a book by astronomer Paolo Maffei titled "La cometa di Halley" which covers most comets since early times up to 1984. All comets described, many by Chinese astronomers, had tails. They are mostly spherical objects with a tail, sometimes two tails. I also think that Oumuamua was not a comet.
Tullio

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Reviewing the articles from a few months ago about Oumuamua, one is struck with how firm was the asteroidal interpretation. Now that we have seen enough acceleration to put it 100,000 kilometers farther out in space than expected, there is this effort to fit it into the comet mold, even if it doesn't fit very well.

Alternately, some have suggested that it is an asteroid, but is being affected by the Yarkovsky Effect. This seems far too negligible to have moved an asteroid to anywhere near this extent, in a matter of months. I understand that it is typically measured in distances of one or a few kilometers per year.