Interstellar Interlopers - Unmanned Spaceflight.com

Interstellar Interlopers, Coming in from the great beyond

Holder of the Tw... Holder of the Two Leashes View Member Profile	Oct 27 2017, 01:40 PM Post #1
Member Group: Members Posts: 540 Joined: 17-November 05 From: Oklahoma Member No.: 557	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

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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