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Interstellar Interlopers, Coming in from the great beyond
Holder of the Tw...
post Oct 27 2017, 01:40 PM
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They finally found a chunk of something coming into the Solar System. Something much bigger than cosmic rays or dust particles.

Asteroid/comet in hyperbolic trajectory
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Posts in this topic
- Holder of the Two Leashes   Interstellar Interlopers   Oct 27 2017, 01:40 PM
- - Gladstoner   The estimated eccentricity of 1.19 (per Wikipedia)...   Oct 27 2017, 06:47 PM
|- - fredk   QUOTE (Gladstoner @ Oct 27 2017, 07:47 PM...   Oct 27 2017, 07:05 PM
- - Paolo   I was surprised at first by the "low" ec...   Oct 27 2017, 07:04 PM
- - Paolo   the error bar for eccentricity is actually quite s...   Oct 27 2017, 07:13 PM
- - fredk   Thanks for that reference, Paolo. Still, there ha...   Oct 27 2017, 07:32 PM
|- - Holder of the Two Leashes   QUOTE (fredk @ Oct 27 2017, 02:32 PM) Sti...   Oct 27 2017, 09:09 PM
- - Gladstoner   For reference, a list of all 'hyperbolic' ...   Oct 27 2017, 07:51 PM
- - Paolo   many of these articles were written before a secon...   Oct 28 2017, 05:16 AM
- - JRehling   The challenges are obvious, but it would be nice t...   Oct 28 2017, 09:48 PM
|- - TheAnt   QUOTE (JRehling @ Oct 28 2017, 11:48 PM) ...   Oct 28 2017, 10:46 PM
- - Gladstoner   I recall reading several years ago about a year-ro...   Oct 28 2017, 11:12 PM
- - JohnVV   using the HORIZONS telnet ( yes telnet from the 70...   Oct 28 2017, 11:58 PM
|- - JRehling   TheAnt, Truly reaching this object will be quite ...   Oct 30 2017, 12:48 AM
|- - TheAnt   QUOTE (JRehling @ Oct 30 2017, 01:48 AM) ...   Oct 30 2017, 03:08 PM
|- - Gladstoner   QUOTE (TheAnt @ Oct 30 2017, 10:08 AM) Af...   Oct 30 2017, 03:36 PM
|- - HSchirmer   QUOTE (TheAnt @ Oct 30 2017, 04:08 PM) I ...   Oct 30 2017, 06:07 PM
|- - TheAnt   QUOTE (HSchirmer @ Oct 30 2017, 07:07 PM)...   Oct 30 2017, 07:47 PM
|- - HSchirmer   QUOTE (TheAnt @ Oct 30 2017, 08:47 PM) I ...   Oct 30 2017, 10:13 PM
- - Gladstoner   Path of approach of A/2017 U1 plotted in Voyager I...   Oct 30 2017, 05:40 AM
- - Gladstoner   I gather that it would be prudent to give this reg...   Oct 30 2017, 05:46 AM
- - Paolo   that was fast! Palomar Optical Spectrum of Hy...   Oct 30 2017, 05:52 AM
- - Floyd   QUOTE (Gladstoner @ Oct 30 2017, 01:40 AM...   Oct 30 2017, 11:55 AM
|- - Ames   QUOTE (Floyd @ Oct 30 2017, 11:55 AM) The...   Oct 30 2017, 12:42 PM
- - Explorer1   If only it had been noticed earlier, before closes...   Oct 30 2017, 05:54 PM
- - fredk   It just depends on the velocity distribution of in...   Oct 30 2017, 10:36 PM
- - ngunn   I'd like to know the miss distance of its appr...   Oct 31 2017, 12:21 AM
|- - HSchirmer   QUOTE (ngunn @ Oct 31 2017, 01:21 AM) I...   Oct 31 2017, 07:08 PM
|- - Paolo   QUOTE (HSchirmer @ Oct 31 2017, 08:08 PM)...   Nov 1 2017, 06:49 AM
- - fredk   That's called the impact parameter. It's ...   Oct 31 2017, 12:46 AM
|- - JRehling   I think the two most important kinds of scrutiny f...   Oct 31 2017, 06:25 PM
|- - Gerald   QUOTE (JRehling @ Oct 31 2017, 08:25 PM) ...   Nov 1 2017, 08:02 PM
- - Phil Stooke   I'm afraid that's not quite how it works. ...   Oct 31 2017, 07:25 PM
- - fredk   The sun also doesn't help. The slingshot mech...   Oct 31 2017, 07:45 PM
|- - HSchirmer   QUOTE (fredk @ Oct 31 2017, 08:45 PM) The...   Oct 31 2017, 08:26 PM
- - fredk   For the sun, the outgoing speed will clearly be th...   Oct 31 2017, 09:58 PM
- - Paolo   and a second arXiv paper: Kinematics of the Inters...   Nov 1 2017, 07:05 AM
- - nprev   Going back to the object itself, interesting that ...   Nov 1 2017, 11:39 PM
|- - Gladstoner   QUOTE (nprev @ Nov 1 2017, 05:39 PM) Goin...   Nov 2 2017, 12:20 AM
- - Gerald   You'll probably need an environment, where lig...   Nov 2 2017, 02:10 AM
- - Gladstoner   Are there asteroids in the inner solar system with...   Nov 2 2017, 04:12 AM
- - Gerald   A coating of a few microns of a pigment like tholi...   Nov 2 2017, 10:37 AM
|- - JRehling   A/2017 U1 had no observed coma, so it had little i...   Nov 2 2017, 03:18 PM
||- - HSchirmer   QUOTE (JRehling @ Nov 2 2017, 04:18 PM) A...   Dec 19 2017, 02:20 AM
|- - nprev   QUOTE (Gerald @ Nov 2 2017, 02:37 AM) Ama...   Nov 3 2017, 08:14 AM
- - fredk   Makes me wonder about capture: some extremely smal...   Nov 2 2017, 04:48 PM
- - Gladstoner   It has been hypothesized that comet 96P/Machholz c...   Nov 2 2017, 05:04 PM
- - Gerald   I wouldn't call the ejection of a small Jovian...   Nov 3 2017, 11:48 AM
- - Paolo   I suspect that the xenoasteroid's redness has ...   Nov 3 2017, 03:24 PM
|- - HSchirmer   QUOTE (Paolo @ Nov 3 2017, 03:24 PM) I su...   Nov 3 2017, 10:48 PM
- - nprev   Pity we'll never get a high-res image of it. I...   Nov 3 2017, 07:56 PM
- - Gerald   I wonder, how this observation of an extrasolar as...   Nov 3 2017, 11:28 PM
|- - HSchirmer   QUOTE (Gerald @ Nov 4 2017, 12:28 AM) So,...   Nov 4 2017, 11:21 PM
- - Paolo   IIRC interstellar grains are mostly supposed to fo...   Nov 4 2017, 06:32 AM
|- - Paolo   QUOTE (Paolo @ Nov 4 2017, 07:32 AM) I re...   Nov 25 2017, 04:22 PM
- - Gerald   The paper I mentioned above says at the end of pag...   Nov 4 2017, 08:50 AM
|- - JRehling   In our solar system, small (asteroid) and very sma...   Nov 7 2017, 04:43 PM
- - Paolo   a new naming convention for interstellar objects: ...   Nov 7 2017, 09:09 AM
- - stevesliva   You omitted the 1, which when you get down to thin...   Nov 7 2017, 02:19 PM
- - Paolo   a good update on what's known about 'Oumua...   Nov 12 2017, 07:39 AM
|- - HSchirmer   QUOTE (Paolo @ Nov 12 2017, 07:39 AM) a g...   Nov 12 2017, 01:33 PM
- - djellison   The spacecraft would not have survived the trip. ...   Nov 12 2017, 03:31 PM
- - hendric   With all the hot Jupiters we've discovered, I ...   Nov 13 2017, 04:36 PM
|- - JRehling   Hot Jupiters are relatively rare. We discovered so...   Nov 14 2017, 04:31 PM
- - Hungry4info   With as deep in their star's gravitational wel...   Nov 13 2017, 04:55 PM
|- - HSchirmer   QUOTE (Hungry4info @ Nov 13 2017, 05:55 P...   Nov 13 2017, 06:40 PM
- - hendric   Well, my assumption was that the source solar syst...   Nov 13 2017, 07:59 PM
- - fredk   Here's a twist - a paper looking at the possib...   Nov 17 2017, 03:37 PM
- - nprev   Well...at least it's a testable hypothesis if ...   Nov 18 2017, 07:09 AM
- - dudley   Examination of the light curve of Oumuamua as it r...   Nov 18 2017, 04:10 PM
|- - TheAnt   QUOTE (dudley @ Nov 18 2017, 05:10 PM) Ex...   Nov 18 2017, 04:21 PM
|- - Explorer1   QUOTE (dudley @ Nov 18 2017, 11:10 AM) Ex...   Nov 18 2017, 05:18 PM
|- - dudley   QUOTE (Explorer1 @ Nov 18 2017, 05:18 PM)...   Nov 18 2017, 06:14 PM
- - fredk   It's not entirely clear what Occam would say a...   Nov 18 2017, 05:34 PM
- - Ron Hobbs   ESO has a press release out today with an artist...   Nov 20 2017, 06:00 PM
- - Gerald   Possibly a collision fragment. But figures of equi...   Nov 20 2017, 09:34 PM
- - dudley   The differences in reflectivity, through the cours...   Nov 20 2017, 11:11 PM
- - fredk   It's worth pointing out that the lightcurve br...   Nov 21 2017, 01:06 AM
- - dudley   The linked article is a few days old, so has the o...   Nov 21 2017, 02:31 AM
- - fredk   You can read in the original Nature paper linked i...   Nov 21 2017, 05:26 AM
- - Floyd   There must be Psyche-like bodies in other systems....   Nov 21 2017, 01:36 PM
- - Explorer1   Have we confirmed (from any 'precovery images...   Nov 22 2017, 12:17 AM
- - dudley   The trend in thinking about this object now, is th...   Nov 22 2017, 03:22 AM
- - TheAnt   So we have to accept that 1I/2017 U1 truly have on...   Nov 22 2017, 03:20 PM
|- - dudley   QUOTE (TheAnt @ Nov 22 2017, 04:20 PM) So...   Nov 22 2017, 08:15 PM
|- - TheAnt   QUOTE (dudley @ Nov 22 2017, 09:15 PM) A ...   Nov 23 2017, 11:20 PM
- - Ron Hobbs   The artwork from M. Kornmesser at ESO is the APOD ...   Nov 22 2017, 05:16 PM
- - Gladstoner   Objects in our solar system have been subjected to...   Nov 23 2017, 12:03 AM
- - dudley   Perhaps Oumuamua was ejected from its home system ...   Nov 23 2017, 02:16 AM
|- - Gladstoner   QUOTE (dudley @ Nov 22 2017, 08:16 PM) Sh...   Nov 23 2017, 06:36 AM
- - Gerald   As far as I understood, any detectable cometary ac...   Nov 23 2017, 03:04 PM
- - nprev   ADMIN NOTE: Two posts in violation of rule 1.3 rem...   Nov 23 2017, 04:38 PM
- - dudley   The length of Oumuamua was first given as 180, and...   Nov 24 2017, 06:40 PM
- - nprev   I haven't seen error bars for any of these mea...   Nov 24 2017, 07:21 PM
- - fredk   Adding to nprev's comments, the lightcurve onl...   Nov 24 2017, 09:09 PM
|- - JRehling   In real estate, the three most important things ar...   Nov 25 2017, 07:08 AM
- - Floyd   Excellent point on multiple rounds of exceptional ...   Nov 25 2017, 02:09 PM
- - Gerald   This seems to be within the possible scenarios on ...   Dec 19 2017, 09:56 AM
|- - JRehling   It seems like the number of possible hypotheses is...   Dec 20 2017, 04:25 AM
- - nprev   We've got evidence that many systems have plan...   Dec 20 2017, 05:41 AM
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