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Interstellar Interloper, Coming in from the great beyond
nprev
post Jun 28 2018, 04:09 AM
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Either that or just heated dust expanding and poofing out. The entire object was at a few degrees Kelvin for who knows how many millions of years before it entered our system.


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A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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HSchirmer
post Sep 2 2018, 02:26 PM
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A papers came out in May measuring the different between the in-bound and out-bound trajectories.

Sugggestions are that it has lost all of it's fine surface dust, so the venting gas is throwing out sand grain sized material, which is almost impossible to detect - so, it's a "dark comet"


NON-GRAVITATIONAL ACCELERATION IN THE ORBIT OF 1I/2017 U1 (‘Oumuamua)
DRAFT 13 pages
https://www.spacetelescope.org/static/archi...3/heic1813a.pdf

Non-gravitational acceleration in the trajectory of 1I/2017 U1 (‘Oumuamua)
Published 24 pages
http://www.ifa.hawaii.edu/~meech/papers/20...2018-Nature.pdf




https://www.nasa.gov/feature/jpl/chasing-oumuamua
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HSchirmer
post Sep 2 2018, 02:31 PM
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QUOTE (Holder of the Two Leashes @ Jun 27 2018, 10:31 PM) *
Back to being a comet? There appears to have been some outgassing after all ...


I initially argued that they should check for a change in speed because of fragmentation-
if a fragment breaks off a comet around perihelion, the period of highest stresses,
then the fragments carry slighly different velocities, AND you expose fresh ices.

That also raised the interesting possibility is that if Oumaumau was accellerated, the small fragment should be decellerated, and
might be on a solar capture orbit- analagous to models where Neptune can capturing Triton if it starts as a dual-KBO, one is ejected, the other is captured.

However, the paper finds that a fragment would have to be about 1% of the size, and nothing that big was detected.
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