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: 541 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

Replies

JohnVV View Member Profile	Oct 28 2017, 11:58 PM Post #2
Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489	using the HORIZONS telnet ( yes telnet from the 70's) service i was able to grab a copy of the SPICE data bsp file visualizing it using Celestia ( you could also use Cosmagrapha-spice on the PDS ftp servers ) ( note- the mesh in the first 2 images is 100% synthetic )

JRehling View Member Profile	Oct 30 2017, 12:48 AM Post #3
Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321	TheAnt, Truly reaching this object will be quite difficult, but compared to sending a mission (much less a sample return!!!) to another star's system, it's outrageously easy. I think getting mere in situ isotopic analysis of heavier elements from an object like this would be extraordinarily valuable, and an examination of the morphology of chondritic material in an object like this (if there is such a thing) would weigh mightily in addition to that. Certainly it would be easier to target a future such object while it is close to the inner solar system, but we may have to wait decades for something like that… the mission would practically have to be ready on the pad for such an object to appear, and this certainly confounds conventional mission planning. Catching this one from behind fits more traditional planning but may require extraordinary resources. I might guess that the way ahead will be to develop the capability to target much smaller interlopers… there is presumably a power law relating size and frequency, and there must be interloping objects on a regular basis if one can lower the size requirement sufficiently. To take an entirely different approach, perhaps some of this material survives impact and rather than targeting a fast-flying body we could try to find such material that has already impacted the Moon or some other ancient, airless body. However, the velocities and energies involved may end that hope from the get-go.

TheAnt View Member Profile	Oct 30 2017, 03:08 PM Post #4
Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336	QUOTE (JRehling @ Oct 30 2017, 01:48 AM) TheAnt, Truly reaching this object will be quite difficult, but compared to sending a mission (much less a sample return!!!) to another star's system, it's outrageously easy. I think getting mere in situ isotopic analysis of heavier elements from an object like this would be extraordinarily valuable.... I agree in full about the value of getting such a sample, it would add to the knowledge about our own Kupier or Oort belt also. And that was the reason I did that back-of-envelope type of calculation. Only to find that a sample return would require a spacecraft of Frankensteinian proportions, so for several reasons not within a magnitude of our current capabilities. That's why I mentioned cubesats/U-class spacecrafts first, cheap components built by any interested university, comparatively easy to store and to be sent by the dozen. So yes, in situ or remote by a small craft that might even fly in formation is possible, one of the cubesats might even be sent to collide to get additional data. Smaller objects will indeed be more frequent, but harder to find at the distance needed to get our interceptor on the way in time. In addition, fragment of comets might have similar orbits making the tracking even harder. Now a search for any such that might have impacted on the Moon or any other object without an atmosphere is worth thinking about. Even though the shattered remains would be a bit less pristine, extremely heated up rather, it would still be possible to get some data. After my previous post I realized one kind of probe in development that indeed would be able to reach A/2017 U1 - the sail in development by Breakthrough Starshot. And that is a much more realistic target for such a spacecraft, accelerated to 30-50 Km/s instead of 50 000 km/s or whatever they hope for. Even that tiny proposed transmitter ½ W or whatever, might be able to send the data back - a nice advantage. Ooops! I better stop, all of a sudden I appear to be a supporter or Phlebotinum technology! =)

Gladstoner View Member Profile	Oct 30 2017, 03:36 PM Post #5
Member Group: Members Posts: 715 Joined: 3-January 08 Member No.: 3995	QUOTE (TheAnt @ Oct 30 2017, 10:08 AM) After my previous post I realized one kind of probe in development that indeed would be able to reach A/2017 U1 - the sail in development by Breakthrough Starshot. And that is a much more realistic target for such a spacecraft, accelerated to 30-50 Km/s instead of 50 000 km/s or whatever they hope for. Even that tiny proposed transmitter ½ W or whatever, might be able to send the data back - a nice advantage. Ooops! I better stop, all of a sudden I appear to be a supporter or Phlebotinum technology! =) Interesting! FWIW, here is an ephemeris of A/2017 U1 for the next century in ~half-year increments (from JPL HORIZONS). Shown are object position date, sky coordinates, magnitude, distance from sun in AU (range), and range rate. Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC APmag r rdot *************************************************************************** 2017-Jan-01 00:00 18 10 48.25 +24 14 08.4 30.25 5.480932452578 -31.5363755 2017-Jul-03 00:00 15 32 00.23 +53 39 52.0 25.78 1.889032162719 -38.5709524 2018-Jan-02 00:00 23 31 39.21 +09 15 17.0 27.69 2.865905946364 35.3016311 2018-Jul-04 00:00 00 54 46.46 +24 45 49.3 30.73 6.310209706508 30.9243218 2019-Jan-03 00:00 23 47 03.93 +19 48 22.3 32.33 9.492071071897 29.4799470 2019-Jul-05 00:00 00 23 59.88 +24 55 04.3 33.48 12.56469466334 28.7362338 2020-Jan-04 00:00 23 49 03.67 +21 41 49.5 34.36 15.57559887711 28.2766783 2020-Jul-05 00:00 00 13 38.17 +24 54 51.9 35.07 18.54638060269 27.9624986 2021-Jan-04 00:00 23 49 51.33 +22 31 22.7 35.69 21.48873606470 27.7322127 2021-Jul-06 00:00 00 08 21.67 +24 54 13.9 36.22 24.40982212577 27.5556680 2022-Jan-05 00:00 23 50 17.39 +22 59 32.2 36.69 27.31424412971 27.4149317 2022-Jul-07 00:00 00 05 08.78 +24 53 44.4 37.11 30.20527197114 27.3002568 2023-Jan-06 00:00 23 50 33.95 +23 17 50.3 37.50 33.08517864084 27.2043140 2023-Jul-08 00:00 00 02 58.39 +24 53 22.8 37.84 35.95579599000 27.1233533 2024-Jan-07 00:00 23 50 45.19 +23 30 43.4 38.17 38.81844478692 27.0537124 2024-Jul-08 00:00 00 01 23.90 +24 53 06.4 38.46 41.67432291663 26.9940086 2025-Jan-07 00:00 23 50 53.11 +23 40 17.5 38.75 44.52427964797 26.9421107 2025-Jul-09 00:00 00 00 11.88 +24 52 51.7 39.00 47.36918076463 26.8974383 2026-Jan-08 00:00 23 50 58.77 +23 47 39.5 39.26 50.20960167493 26.8581905 2026-Jul-10 00:00 23 59 15.03 +24 52 37.3 39.48 53.04620010132 26.8240801 2027-Jan-09 00:00 23 51 02.95 +23 53 29.1 39.71 55.87935864384 26.7937684 2027-Jul-11 00:00 23 58 28.92 +24 52 22.6 39.91 58.70958668171 26.7673787 2028-Jan-10 00:00 23 51 06.18 +23 58 12.2 40.12 61.53711806064 26.7437097 2028-Jul-11 00:00 23 57 50.79 +24 52 07.6 40.30 64.36234819915 26.7228467 2029-Jan-10 00:00 23 51 08.78 +24 02 05.6 40.49 67.18540107417 26.7036419 2029-Jul-12 00:00 23 57 18.82 +24 51 53.1 40.66 70.00659655710 26.6863708 2030-Jan-11 00:00 23 51 11.07 +24 05 21.9 40.84 72.82596926704 26.6701114 2030-Jul-13 00:00 23 56 51.68 +24 51 39.7 40.99 75.64376934851 26.6552907 2031-Jan-12 00:00 23 51 13.17 +24 08 10.1 41.16 78.45995555855 26.6409568 2031-Jul-14 00:00 23 56 28.49 +24 51 28.1 41.30 81.27473208547 26.6274029 2032-Jan-13 00:00 23 51 15.19 +24 10 36.3 41.45 84.08799925892 26.6136987 2032-Jul-14 00:00 23 56 08.47 +24 51 18.6 41.58 86.89992433998 26.6004116 2033-Jan-13 00:00 23 51 17.15 +24 12 45.7 41.73 89.71036367251 26.5869003 2033-Jul-15 00:00 23 55 51.03 +24 51 11.5 41.85 92.51947003209 26.5737846 2034-Jan-14 00:00 23 51 19.01 +24 14 41.6 41.99 95.32708409903 26.5603725 2034-Jul-16 00:00 23 55 35.67 +24 51 06.7 42.10 98.13338319320 26.5474188 2035-Jan-15 00:00 23 51 20.72 +24 16 26.1 42.23 100.9382376756 26.5345316 2035-Jul-17 00:00 23 55 21.92 +24 51 03.3 42.34 103.7418799516 26.5227040 2036-Jan-16 00:00 23 51 22.18 +24 18 00.5 42.46 106.5442180234 26.5115771 2036-Jul-17 00:00 23 55 09.45 +24 51 00.3 42.56 109.3455395567 26.5019409 2037-Jan-16 00:00 23 51 23.34 +24 19 25.2 42.68 112.1457872309 26.4931472 2037-Jul-18 00:00 23 54 58.00 +24 50 56.9 42.78 114.9452816962 26.4858139 2038-Jan-17 00:00 23 51 24.25 +24 20 41.3 42.89 117.7439584064 26.4793249 2038-Jul-19 00:00 23 54 47.43 +24 50 52.5 42.98 120.5421316165 26.4743190 2039-Jan-18 00:00 23 51 24.93 +24 21 49.2 43.09 123.3397045015 26.4699764 2039-Jul-20 00:00 23 54 37.69 +24 50 47.1 43.18 126.1369684489 26.4666519 2040-Jan-19 00:00 23 51 25.50 +24 22 50.1 43.28 128.9337854645 26.4634958 2040-Jul-20 00:00 23 54 28.70 +24 50 40.7 43.36 131.7304236184 26.4610408 2041-Jan-19 00:00 23 51 26.03 +24 23 45.0 43.46 134.5267014939 26.4585773 2041-Jul-21 00:00 23 54 20.46 +24 50 33.8 43.54 137.3228545106 26.4565905 2042-Jan-20 00:00 23 51 26.56 +24 24 35.1 43.63 140.1186566277 26.4542362 2042-Jul-22 00:00 23 54 12.92 +24 50 27.1 43.71 142.9143240201 26.4519119 2043-Jan-21 00:00 23 51 27.19 +24 25 21.5 43.80 145.7095951991 26.4488311 2043-Jul-23 00:00 23 54 06.06 +24 50 20.9 43.88 148.5046609684 26.4455781 2044-Jan-22 00:00 23 51 27.89 +24 26 04.9 43.96 151.2992201805 26.4415150 2044-Jul-23 00:00 23 53 59.82 +24 50 15.8 44.03 154.0934496632 26.4371469 2045-Jan-22 00:00 23 51 28.68 +24 26 46.2 44.12 156.8870283178 26.4317178 2045-Jul-24 00:00 23 53 54.10 +24 50 11.8 44.19 159.6801401032 26.4258816 2046-Jan-23 00:00 23 51 29.51 +24 27 25.9 44.27 162.4724718766 26.4192610 2046-Jul-25 00:00 23 53 48.83 +24 50 09.1 44.33 165.2642466500 26.4127921 2047-Jan-24 00:00 23 51 30.32 +24 28 03.9 44.41 168.0551860974 26.4061158 2047-Jul-26 00:00 23 53 43.88 +24 50 07.1 44.48 170.8455768218 26.4000655 2048-Jan-25 00:00 23 51 31.06 +24 28 40.1 44.55 173.6351989204 26.3942348 2048-Jul-26 00:00 23 53 39.16 +24 50 05.4 44.61 176.4244060000 26.3894526 2049-Jan-25 00:00 23 51 31.66 +24 29 14.1 44.69 179.2130070134 26.3852944 2049-Jul-27 00:00 23 53 34.62 +24 50 03.4 44.75 182.0013795829 26.3824557 2050-Jan-26 00:00 23 51 32.13 +24 29 45.5 44.82 184.7893297743 26.3802049 2050-Jul-28 00:00 23 53 30.25 +24 50 00.8 44.88 187.5772360404 26.3789347 2051-Jan-27 00:00 23 51 32.52 +24 30 14.6 44.95 190.3648762331 26.3778834 2051-Jul-29 00:00 23 53 26.08 +24 49 57.5 45.00 193.1526084366 26.3776262 2052-Jan-28 00:00 23 51 32.85 +24 30 41.4 45.07 195.9401713849 26.3774871 2052-Jul-29 00:00 23 53 22.10 +24 49 53.7 45.13 198.7278960412 26.3778679 2053-Jan-28 00:00 23 51 33.18 +24 31 06.2 45.19 201.5154800279 26.3779210 2053-Jul-30 00:00 23 53 18.36 +24 49 49.5 45.24 204.3032353277 26.3780759 2054-Jan-29 00:00 23 51 33.54 +24 31 29.6 45.31 207.0908264328 26.3776450 2054-Jul-31 00:00 23 53 14.86 +24 49 45.5 45.36 209.8785399827 26.3771736 2055-Jan-30 00:00 23 51 33.96 +24 31 52.0 45.42 212.6659979793 26.3759706 2055-Aug-01 00:00 23 53 11.62 +24 49 41.8 45.47 215.4534686765 26.3744406 2056-Jan-31 00:00 23 51 34.45 +24 32 13.7 45.53 218.2405487454 26.3718108 2056-Aug-01 00:00 23 53 08.61 +24 49 38.8 45.58 221.0274973699 26.3686251 2057-Jan-31 00:00 23 51 34.99 +24 32 35.1 45.64 223.8138932763 26.3644430 2057-Aug-02 00:00 23 53 05.81 +24 49 36.6 45.69 226.6000064676 26.3600162 2058-Feb-01 00:00 23 51 35.56 +24 32 56.3 45.75 229.3854289017 26.3548746 2058-Aug-03 00:00 23 53 03.16 +24 49 35.1 45.79 232.1704758092 26.3497464 2059-Feb-02 00:00 23 51 36.11 +24 33 17.2 45.85 234.9547887149 26.3443557 2059-Aug-04 00:00 23 53 00.61 +24 49 34.2 45.89 237.7387558508 26.3396530 2060-Feb-03 00:00 23 51 36.60 +24 33 37.5 45.95 240.5220705249 26.3353909 2060-Aug-04 00:00 23 52 58.09 +24 49 33.2 45.99 243.3051736701 26.3323038 2061-Feb-03 00:00 23 51 36.98 +24 33 56.8 46.05 246.0877883402 26.3298305 2061-Aug-05 00:00 23 52 55.60 +24 49 31.9 46.09 248.8703861956 26.3284595 2062-Feb-04 00:00 23 51 37.27 +24 34 14.8 46.15 251.6526845958 26.3275742 2062-Aug-06 00:00 23 52 53.13 +24 49 30.0 46.19 254.4351439185 26.3277427 2063-Feb-05 00:00 23 51 37.49 +24 34 31.5 46.24 257.2174488946 26.3283175 2063-Aug-07 00:00 23 52 50.71 +24 49 27.5 46.28 260.0000394086 26.3296212 2064-Feb-06 00:00 23 51 37.68 +24 34 47.0 46.33 262.7825631934 26.3308361 2064-Aug-07 00:00 23 52 48.37 +24 49 24.4 46.37 265.5654372282 26.3323923 2065-Feb-06 00:00 23 51 37.85 +24 35 01.4 46.42 268.3482733287 26.3336897 2065-Aug-08 00:00 23 52 46.12 +24 49 21.0 46.46 271.1314623971 26.3351963 2066-Feb-07 00:00 23 51 38.06 +24 35 15.0 46.51 273.9145733456 26.3361683 2066-Aug-09 00:00 23 52 44.01 +24 49 17.6 46.55 276.6979746497 26.3369434 2067-Feb-08 00:00 23 51 38.31 +24 35 28.2 46.60 279.4812060583 26.3368044 2067-Aug-10 00:00 23 52 42.03 +24 49 14.4 46.63 282.2646177022 26.3362287 2068-Feb-09 00:00 23 51 38.62 +24 35 41.2 46.68 285.0477139224 26.3346920 2068-Aug-10 00:00 23 52 40.19 +24 49 11.6 46.72 287.8308317662 26.3327335 2069-Feb-09 00:00 23 51 38.98 +24 35 54.3 46.77 290.6134657804 26.3297552 2069-Aug-11 00:00 23 52 38.46 +24 49 09.4 46.80 293.3959708719 26.3263162 2070-Feb-10 00:00 23 51 39.36 +24 36 07.4 46.85 296.1778614745 26.3221299 2070-Aug-12 00:00 23 52 36.80 +24 49 07.7 46.88 298.9595424847 26.3181184 2071-Feb-11 00:00 23 51 39.74 +24 36 20.6 46.93 301.7405769084 26.3140978 2071-Aug-13 00:00 23 52 35.19 +24 49 06.3 46.96 304.5214341643 26.3107922 2072-Feb-12 00:00 23 51 40.06 +24 36 33.5 47.01 307.3017298453 26.3078283 2072-Aug-13 00:00 23 52 33.57 +24 49 04.9 47.04 310.0819918084 26.3058512 2073-Feb-12 00:00 23 51 40.33 +24 36 45.7 47.08 312.8618603634 26.3044613 2073-Aug-14 00:00 23 52 31.95 +24 49 03.1 47.11 315.6418739165 26.3042195 2074-Feb-13 00:00 23 51 40.53 +24 36 57.3 47.16 318.4216565204 26.3045300 2074-Aug-15 00:00 23 52 30.33 +24 49 01.0 47.19 321.2017384038 26.3056751 2075-Feb-14 00:00 23 51 40.69 +24 37 08.0 47.23 323.9817161684 26.3069288 2075-Aug-16 00:00 23 52 28.74 +24 48 58.4 47.26 326.7620959899 26.3086960 2076-Feb-15 00:00 23 51 40.84 +24 37 18.1 47.31 329.5424355575 26.3104561 2076-Aug-16 00:00 23 52 27.20 +24 48 55.4 47.33 332.3232149080 26.3125811 2077-Feb-15 00:00 23 51 41.00 +24 37 27.5 47.38 335.1039531217 26.3143279 2077-Aug-17 00:00 23 52 25.73 +24 48 52.3 47.41 337.8851064850 26.3159741 2078-Feb-16 00:00 23 51 41.19 +24 37 36.6 47.45 340.6661631250 26.3169159 2078-Aug-18 00:00 23 52 24.34 +24 48 49.3 47.48 343.4475583501 26.3175945 2079-Feb-17 00:00 23 51 41.43 +24 37 45.6 47.52 346.2287409193 26.3174539 2079-Aug-19 00:00 23 52 23.05 +24 48 46.5 47.55 349.0101221132 26.3168540 2080-Feb-18 00:00 23 51 41.72 +24 37 54.7 47.59 351.7911284179 26.3151602 2080-Aug-19 00:00 23 52 21.86 +24 48 44.2 47.61 354.5721698930 26.3127923 2081-Feb-18 00:00 23 51 42.05 +24 38 04.1 47.65 357.3526656288 26.3094031 2081-Aug-20 00:00 23 52 20.73 +24 48 42.3 47.68 360.1330427424 26.3057455 2082-Feb-19 00:00 23 51 42.40 +24 38 13.7 47.72 362.9127467774 26.3015826 2082-Aug-21 00:00 23 52 19.65 +24 48 41.0 47.75 365.6922599466 26.2975583 2083-Feb-20 00:00 23 51 42.74 +24 38 23.4 47.79 368.4710831365 26.2934393 2083-Aug-22 00:00 23 52 18.57 +24 48 39.9 47.81 371.2497695288 26.2900171 2084-Feb-21 00:00 23 51 43.04 +24 38 33.0 47.85 374.0278720167 26.2871290 2084-Aug-22 00:00 23 52 17.48 +24 48 38.8 47.88 376.8059860250 26.2853655 2085-Feb-21 00:00 23 51 43.28 +24 38 42.2 47.91 379.5836783193 26.2842374 2085-Aug-23 00:00 23 52 16.37 +24 48 37.4 47.94 382.3615591870 26.2840748 2086-Feb-22 00:00 23 51 43.46 +24 38 51.0 47.98 385.1391871696 26.2843147 2086-Aug-24 00:00 23 52 15.24 +24 48 35.7 48.00 387.9171567196 26.2853453 2087-Feb-23 00:00 23 51 43.61 +24 38 59.1 48.04 390.6949897075 26.2866869 2087-Aug-25 00:00 23 52 14.12 +24 48 33.6 48.06 393.4732557222 26.2886114 2088-Feb-24 00:00 23 51 43.75 +24 39 06.7 48.10 396.2514440776 26.2904232 2088-Aug-25 00:00 23 52 13.02 +24 48 31.2 48.12 399.0301005893 26.2923505 2089-Feb-24 00:00 23 51 43.89 +24 39 14.0 48.16 401.8086806126 26.2939102 2089-Aug-26 00:00 23 52 11.96 +24 48 28.7 48.18 404.5877061803 26.2954949 2090-Feb-25 00:00 23 51 44.05 +24 39 21.0 48.22 407.3665956339 26.2965449 2090-Aug-27 00:00 23 52 10.97 +24 48 26.2 48.24 410.1458442877 26.2972620 2091-Feb-26 00:00 23 51 44.25 +24 39 27.9 48.28 412.9248423800 26.2970596 2091-Aug-28 00:00 23 52 10.03 +24 48 23.9 48.30 415.7040726003 26.2962758 2092-Feb-27 00:00 23 51 44.48 +24 39 35.0 48.33 418.4829013260 26.2945387 2092-Aug-28 00:00 23 52 09.16 +24 48 22.0 48.36 421.2618006803 26.2923453 2093-Feb-27 00:00 23 51 44.73 +24 39 42.3 48.39 424.0401357992 26.2893477 2093-Aug-29 00:00 23 52 08.33 +24 48 20.4 48.41 426.8184085677 26.2860161 2094-Feb-28 00:00 23 51 45.00 +24 39 49.8 48.45 429.5960196202 26.2821596 2094-Aug-30 00:00 23 52 07.51 +24 48 19.1 48.47 432.3735266968 26.2785692 2095-Mar-01 00:00 23 51 45.24 +24 39 57.3 48.50 435.1503861705 26.2752485 2095-Aug-31 00:00 23 52 06.69 +24 48 17.9 48.52 437.9272188157 26.2728050 2096-Mar-01 00:00 23 51 45.45 +24 40 04.7 48.56 440.7035255146 26.2709070 2096-Aug-31 00:00 23 52 05.85 +24 48 16.6 48.58 443.4799688578 26.2699776 2097-Mar-02 00:00 23 51 45.60 +24 40 11.7 48.61 446.2560672260 26.2696723 2097-Sep-01 00:00 23 52 04.97 +24 48 15.0 48.63 449.0324857663 26.2703844 2098-Mar-03 00:00 23 51 45.71 +24 40 18.3 48.66 451.8087176126 26.2716587 2098-Sep-02 00:00 23 52 04.09 +24 48 13.1 48.68 454.5854073946 26.2736797 2099-Mar-04 00:00 23 51 45.80 +24 40 24.4 48.72 457.3620210856 26.2758314 2099-Sep-03 00:00 23 52 03.21 +24 48 10.8 48.74 460.1391793005 26.2783048 2100-Mar-05 00:00 23 51 45.88 +24 40 30.1 48.77 462.9163092806 26.2806896 2100-Sep-04 00:00 23 52 02.35 +24 48 08.3 48.79 465.6940016740 26.2832937 2101-Mar-06 00:00 23 51 45.97 +24 40 35.4 48.82 468.4716483939 26.2855656 2101-Sep-05 00:00 23 52 01.53 +24 48 05.6 48.84 471.2498134738 26.2875956 2102-Mar-07 00:00 23 51 46.08 +24 40 40.7 48.87 474.0278568717 26.2888765 2102-Sep-06 00:00 23 52 00.76 +24 48 03.1 48.89 476.8063215535 26.2897021 2103-Mar-08 00:00 23 51 46.24 +24 40 46.0 48.92 479.5845365105 26.2897072 2103-Sep-07 00:00 23 52 00.05 +24 48 00.7 48.94 482.3630197312 26.2891443 2104-Mar-08 00:00 23 51 46.43 +24 40 51.4 48.97 485.1410794424 26.2875876 2104-Sep-07 00:00 23 51 59.39 +24 47 58.7 48.99 487.9192381246 26.2853353 2105-Mar-09 00:00 23 51 46.65 +24 40 57.1 49.02 490.6968133300 26.2821900 2105-Sep-08 00:00 23 51 58.77 +24 47 57.0 49.04 493.4743527262 26.2787755 2106-Mar-10 00:00 23 51 46.88 +24 41 03.0 49.07 496.2512093005 26.2751210 2106-Sep-09 00:00 23 51 58.16 +24 47 55.6 49.08 499.0279908145 26.2717729 2107-Mar-11 00:00 23 51 47.09 +24 41 09.1 49.11 501.8041110989 26.2685871 2107-Sep-10 00:00 23 51 57.55 +24 47 54.3 49.13 504.5802409108 26.2660913 2108-Mar-11 00:00 23 51 47.27 +24 41 15.0 49.16 507.3558400948 26.2642288 2108-Sep-10 00:00 23 51 56.91 +24 47 53.0 49.18 510.1316121800 26.2634340 2109-Mar-12 00:00 23 51 47.42 +24 41 20.7 49.21 512.9070210537 26.2633402 2109-Sep-11 00:00 23 51 56.25 +24 47 51.4 49.23 515.6827674142 26.2640801 2110-Mar-13 00:00 23 51 47.52 +24 41 26.1 49.26 518.4583011834 26.2651943 2110-Sep-12 00:00 23 51 55.58 +24 47 49.6 49.27 521.2343053782 26.2668710 2111-Mar-14 00:00 23 51 47.62 +24 41 31.1 49.30 524.0101933775 26.2687672 2111-Sep-13 00:00 23 51 54.92 +24 47 47.5 49.32 526.7866151287 26.2710698 2112-Mar-14 00:00 23 51 47.70 +24 41 35.8 49.35 529.5629516554 26.2732699 2112-Sep-13 00:00 23 51 54.27 +24 47 45.3 49.36 532.3398291243 26.2753969 2113-Mar-15 00:00 23 51 47.80 +24 41 40.4 49.39 535.1165962531 26.2770413 2113-Sep-14 00:00 23 51 53.65 +24 47 43.0 49.41 537.8938521977 26.2784625 2114-Mar-16 00:00 23 51 47.92 +24 41 44.9 49.44 540.6709136313 26.2793283 2114-Sep-15 00:00 23 51 53.08 +24 47 40.8 49.45 543.4483523707 26.2797139 2115-Mar-17 00:00 23 51 48.08 +24 41 49.5 49.48 546.2254569839 26.2791708 2115-Sep-16 00:00 23 51 52.55 +24 47 38.9 49.50 549.0027868624 26.2778808 2116-Mar-17 00:00 23 51 48.26 +24 41 54.2 49.52 551.7796202594 26.2756504 2116-Sep-16 00:00 23 51 52.06 +24 47 37.2 49.54 554.5565143382 26.2728739 2117-Mar-18 00:00 23 51 48.46 +24 41 59.2 49.57 557.3327542246 26.2694791 2117-Sep-17 00:00 23 51 51.59 +24 47 35.9 49.58 560.1089334275 26.2658555

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

2 Pages

1 2 >

« Next Oldest · Telescopic Observations · Next Newest »