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Interstellar Interlopers, Coming in from the great beyond
nprev
post Sep 25 2019, 05:53 PM
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Yeah, that exceedingly low relative velocity was really the only compelling piece of evidence to me. It does not seem unreasonable to postulate that this body had been at one time loosely (and distantly) associated with Kruger 60 and then perturbed out of the neighborhood & towards the Solar System perhaps just from other distant stellar encounters.

However, that also leaves open the possibility that Kruger 60 was not its system of genesis; might've been a semi-captured drifter there from someplace else.

In any case, fascinating. Looking forward to some good spectral data. smile.gif


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JRehling
post Sep 26 2019, 01:41 AM
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Our system is about 1/3 the age of the universe. Earlier in the age of the universe, heavy elements were nonexistent, then accumulated gradually. So the rate of production of new stars with comets should be, on balance, increasing, though star formation can ebb and flow in ways unique to any given galaxy.

The number of unknowns, though, is profound. We can say that a double system allows a dynamic for easy ejection although a large planet makes that possible as well.
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Gladstoner
post Sep 26 2019, 05:45 AM
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Borisov's path across the sky:

Attached Image


Galactic coordinates are shown.

The comet's approach from near the galactic equator in Cassiopeia:

Attached Image


These were rendered with Voyager II.
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tanjent
post Sep 26 2019, 08:39 AM
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Nice! Where would Kruger 60 be on those maps?
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ngunn
post Sep 26 2019, 09:53 AM
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Great plots Gladstoner, thanks for posting. smile.gif The first one shows nicely how the comet's path is being deflected by its solar encounter. Look for the antipodal point of its approach path, close to Beta Centauri. That's the direction it was heading before we got in the way.
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fredk
post Sep 26 2019, 02:04 PM
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QUOTE (tanjent @ Sep 26 2019, 09:39 AM) *
Where would Kruger 60 be on those maps?

About 30 degrees west of the asymptotic approach direction, very near the Galactic plane just south of the "house" of Cepheus.
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JRehling
post Sep 27 2019, 11:14 AM
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Some of you may find this site useful for tracking Borisov. I use this for observing comets. Unfortunately, Borisov is a lot dimmer than the comets I have successfully observed, but perhaps we'll get lucky and it will get much brighter in December. It is certainly a wildcard as to how it may behave when it approaches perihelion.

https://theskylive.com/c2019q4-info
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tanjent
post Yesterday, 02:42 AM
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https://www.space.com/mysterious-comet-inte...er-borisov.html


This article refers to a paper by Polish researchers who seem pretty certain that Kreuger 60 is the system of origin.
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