And we know everything about astrophysics to make such a claim? Perhaps it's large enough to have it's own gravitational field and it's shrouded in something akin to a dust 'atmosphere'.
“And we know everything about astrophysics to make such a claim?”
No one is claiming that - just that this is a very unusual object that is exhibiting never before seen behavior, while crossing the solar system in such a way that it defies random chance to the vanishing point.
“Perhaps it’s large enough to have it’s own gravitational field and it’s shrouded in something akin to a dust ‘atmosphere’.”
All solar objects have their own gravitational field: some almost none [ a 20 foot diameter asteroid ], to a lot [ the Sun ]. In this case, as explained, the ‘cloud’ [ if it is a cloud of particles ] is not supposed to be there yet, as it is too far away from the Sun to form, and has a tail facing the wrong way. The ‘cloud’ itself shows no chemical signatures, if it were an out-gassing like a normal comet. It is too small to have a shroud of particles together by gravity alone - and such a thing has never before been seen in the millions and millions of objects surveyed.
There are extreme explanations for most of the features seen, but none in this combination, and in a combination that some features would preclude some others.
What it actually is, we will know more by Oct 29th, until then ...