Possible interstellar asteroid 1I/ʻOumuamua

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Possible interstellar asteroid 1I/ʻOumuamua

Post by Lazarus on 2nd November 2017, 3:31 pm

Looks like our solar system may have recently had a visitor from somewhere else. Apparently not from one of the very nearest systems, though.

Not sure whether this goes under the solar system news or the extrasolar one. It does have an EPE entry... http://exoplanet.eu/catalog/a/2017_u1/ - which I guess makes it the closest, smallest and highest-eccentricity "planet" in the list Razz


Last edited by Lazarus on 10th November 2017, 1:25 pm; edited 1 time in total
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Re: Possible interstellar asteroid 1I/ʻOumuamua

Post by Sirius_Alpha on 2nd November 2017, 4:04 pm

Also noteworthy, the Sun is down to one planet, according to the EPE. Laughing

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Re: Possible interstellar asteroid 1I/ʻOumuamua

Post by Lazarus on 2nd November 2017, 4:34 pm

The Sun + A/2017 U1 is certainly an interesting variation on the difficult-to-source "the Sun, Jupiter, and assorted debris" quote about the makeup of the solar system.
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Re: Possible interstellar asteroid 1I/ʻOumuamua

Post by Edasich on 6th November 2017, 2:05 pm

Anyway it's been quickly removed from EPE catalog, shifted to Unconfirmed section.
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Re: Possible interstellar asteroid 1I/ʻOumuamua

Post by Sirius_Alpha on 6th November 2017, 9:59 pm

Origin of Interstellar Object A/2017 U1 in a Nearby Young Stellar Association?
https://arxiv.org/abs/1711.01300

We suggest that the kinematics and properties of interstellar object A/2017 U1 point towards its formation in a protoplanetary disk in the ~45 Myr-old Carina or Columba young stellar associations, and subsequent ejection with a low peculiar velocity (1-2 km/sec) during or soon after planet formation inside the ice line. This scenario predicts that the Solar System will encounter more such objects with radiants similar to that of A/2017 U1.

They note this would translate to a travel distance of 50 - 85 parsecs.

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Re: Possible interstellar asteroid 1I/ʻOumuamua

Post by Lazarus on 10th November 2017, 1:27 pm

The name is now 1I/ʻOumuamua (initial character is an ʻokina)

Details, including the new designation scheme for interstellar objects, at http://www.minorplanetcenter.net/mpec/K17/K17V17.html
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Re: Possible interstellar asteroid 1I/ʻOumuamua

Post by Sirius_Alpha on 12th November 2017, 9:50 pm

The origin of interstellar asteroidal objects like 1I/2017 U1
https://arxiv.org/abs/1711.03558

The asteroid was apparently within 0.16 parsec of the early G-type(?) star TYC 4742-1027-1 some 1.3 million years ago. That's too far for it to have formed there, so it probably was simply passing near (at least as far as interstellar distances go).

They also estimate that there's ~30,000 rogue interstellar asteroids of this size within 100 AU of the sun (or 100 trillion per cubic parsec).

I don't know if the software they used considers gravitational perturbations of the asteroid's path caused by flying near (at least as far as interstellar distances go) other stars. If not, then it would be interesting to see if TYC 4742-1027-1 ends up getting a lot closer to the asteroid's actual path.

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Re: Possible interstellar asteroid 1I/ʻOumuamua

Post by Edasich on 15th November 2017, 5:37 am

Edasich wrote:Anyway it's been quickly removed from EPE catalog, shifted to Unconfirmed section.

I don't like quoting myself but here it comes again in EPE... Rolling Eyes

http://exoplanet.eu/catalog/1i/2017_u1/
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Re: Possible interstellar asteroid 1I/ʻOumuamua

Post by Lazarus on 20th November 2017, 9:55 am

Dybczyński & Królikowska "On the dynamical history of the recently discovered interstellar object A/2017 U1 - where does it come from?"
https://arxiv.org/abs/1711.06618

More attempts to identify the original star. Limited to about 30 pc of the sun, the best candidate identified (based on encounter velocity) is UCAC4 535-065571. There are small probabilities that the origin may be the exoplanet host star Gliese 876 or the A-type eclipsing binary Delta Capricorni. The closest encounter found was HIP 3757 but the relative velocity is 200 km/s.

On the subject of the previous candidates from the Portegies Zwart et al. paper:
In the last days appeared a preprint by S. Portegies Zwart and colleagues [Portegies Zwart et al., 2017] in which the authors propose five other stars as potential sources for A/2017 U1. We have checked all this cases and according to our calculations none of these stars came closer to A/2017 U1 that 20 pc. Probable reason for this is that in the quoted paper an approximate dynamical model was used but in all five cases these stars are very distant and therefore their motion is sensitive for dynamical model details, especially mutual interactions between all stars involved.
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Re: Possible interstellar asteroid 1I/ʻOumuamua

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