(November 23, 2018 at 7:33 pm)Paleophyte Wrote:(November 23, 2018 at 5:56 pm)Anomalocaris Wrote: Actually, I believe the sun is moving at something like 20-40 km/s relative to LSR. There are many individual or collections of stars that move at much higher delta V to LSR than the sun, but I believe the majority move at substantially lower delta V to LSR than the sun. So it should not be surprising that if ejection by close in gas giant is an important mechanism for stocking interstellar space with asteroid/comet like objects, than a sizeable fraction would move with the LSR.
If an object just barely escape the solar system, it would approach majority of local stars at initial relative velocities similar to that which Omaouaoua possessed relative to the sun before her trip into the solar system.
The numbers that I saw suggested that only about 0.2% of asteroids ejected from stellar systems should have a peculiar velocity (Seriously? These chuckleheads named the one type of velocity that's intuitive "peculiar"?) as low as Oumuamua's. The error bars on that are probably pretty enormous though.
I just think that an object that formed in interstellar space and doesn't fit into any of the pigeonholes that we're familiar with would go a long way to explaining Oumuamua's oddities.
If our assessment of the density of material in typical interstellar space is accurate, and it appears to be corroborated by multiple independent observations, Then the odds that sufficient amount of material can meet by chance and collect into an object the size of this asteroid over the life of the universe must be pretty slim.
If in fact the condition of material density in interstellar space required to provide high chance of objects like this forming within the age of the universe is common, then it would suggest there is far more interstellar material then we have otherwise found evidences for.
