"Pseudo-MPEC" for XL8D89E
Created 2018 Nov 6 1:37:41 UT using Find_Orb
Click here for an explanation of pseudo-MPECs
TLEs (Two-Line Elements) are available for this object here. Be warned that not all software will actually use TLEs for an object in an orbit this high.
This object has the distinction of having the highest known geocentric orbit of any object, unless you include objects at the earth/sun L1 and L2 points, which would be a real stretch.
This is probably the same object as 6Q0B44E, an "unknown" tracked about a decade ago, then lost. I can't get an orbit that uses the observations from both objects. However, consider the following orbital elements for both objects, set to a common intermediate epoch. They do look rather similar, right down to the absolute magnitude and the (somewhat high) area/mass ratio :
Orbital elements: XL8D89E Perigee 2014 Dec 2.726934 +/- 0.00439 TT = 17:26:47 (JD 2456994.226934) Epoch 2015 Jan 1.0 TT; AMR 0.033328 +/- 8.28e-5 m^2/kg Gray M 126.5883820 +/- 0.017 (J2000 equatorial) n 4.3243978255 +/- 6.11e-5 Peri. 78.2464876 +/- 0.0034 a805353.24450 +/- 7.58 Node 261.3441835 +/- 0.007 e 0.205617965 +/- 7.52e-5 Incl. 52.2130720 +/- 0.0017 P 83.25d H 30.0 G 0.15 U 6.2 q 639758.14925 +/- 66.1 Q 970948.33975 +/- 52.4 53 of 63 observations 2016 June 7-Oct. 5; mean residual 0".568 Orbital elements: 6Q0B44E = unk P=80d Perigee 2014 Dec 1.792715 +/- 0.183 TT = 19:01:30 (JD 2456993.292715) Epoch 2015 Jan 1.0 TT; AMR 0.027274 +/- 7.08e-5 m^2/kg Gray M 124.3738152 +/- 0.7 (J2000 equatorial) n 4.1173450917 +/- 0.00539 Peri. 79.1783345 +/- 0.49 a832131.56028 +/- 719 Node 259.9646975 +/- 0.14 e 0.245876670 +/- 0.000874 Incl. 51.8024536 +/- 0.06 P 87.43d H 30.2 G 0.15 U 9.2 q 627529.82249 +/- 295 Q 0.0069301340 +/- 1.07e-5 53 of 56 observations 2006 Aug. 28-2007 Mar. 7; mean residual 1".177
Assuming it's about three meters across, it would mass about 200 kg.
It's not possible to compute an orbit using all observations for either object; each appears to have "maneuvered", or (more likely) has some unmodelled non-gravitational forces. Since I can't even get an orbit consistent with each short arc, it's unsurprising to me that I can't link the two. But I'm pretty much assuming they're the same object.
At some point, it may be possible to go trawling through the survey archives. One might then be able to use the XL8D89E orbit to get some data from 2015, then 2014, and so on, gradually working backward, and perhaps simultaneously going forward from 2007 on 6Q0B44E, eventually meeting in the middle. Almost exactly this was done for WT1190F, the object that re-entered over Sri Lanka in November 2015.
Astrometry:
XL8D89E C2015 11 17.41496803 15 00.834-03 44 27.08 x19.2 RtD0548F51
XL8D89E C2015 11 17.42667403 15 03.754-03 46 50.88 x19.3 RtD0548F51
XL8D89E C2016 01 29.25660201 51 23.050+06 12 24.65 x20.3 RtD0548F51
XL8D89E C2016 01 29.26324101 51 25.325+06 11 16.56 x20.2 RtD0548F51
XL8D89E C2016 01 29.26991401 51 27.734+06 10 07.85 x20.4 RtD0548F51
XL8D89E C2016 01 29.27659201 51 30.244+06 08 59.49 x20.2 RtD0548F51
XL8D89E C2016 03 30.48830316 00 53.600+24 39 46.10 x20.8 RtD0548F51
XL8D89E C2016 03 30.50260216 00 56.462+24 41 36.87 x20.8 RtD0548F51
XL8D89E C2016 03 30.51683316 00 58.912+24 43 24.46 x20.8 RtD0548F51
XL8D89E C2016 03 30.53116116 01 01.104+24 45 06.27 x20.7 RtD0548F51
XL8D89E C2016 06 07.21867 13 27 27.95 -04 03 06.8 20.9 V D0547G96
XL8D89E C2016 06 07.22556 13 27 29.45 -04 02 16.1 20.5 V D0547G96
XL8D89E C2016 06 07.23123 13 27 30.67 -04 01 35.9 20.2 V D0547G96
XL8D89E C2016 06 07.23691 13 27 31.96 -04 00 53.2 20.9 V D0547G96
XL8D89E C2016 06 07.32441 13 27 59.86 -03 50 03.2 21.2 V D0547G96
XL8D89E C2016 06 07.32563 13 28 00.42 -03 49 55.4 21.3 V D0547G96
XL8D89E C2016 06 08.22184 13 38 51.69 -02 05 55.2 21.1 V D0547G96
XL8D89E C2016 06 08.22301 13 38 51.93 -02 05 46.7 21.0 V D0547G96
XL8D89E C2016 06 08.22416 13 38 52.20 -02 05 39.0 21.0 V D0547G96
XL8D89E C2016 06 08.22533 13 38 52.41 -02 05 30.8 20.9 V D0547G96
XL8D89E C2016 06 08.29056 13 39 09.51 -01 57 46.9 20.9 V D0547G96
XL8D89E C2016 06 08.29244 13 39 10.08 -01 57 34.6 20.4 V D0547G96
XL8D89E C2016 06 08.29437 13 39 10.73 -01 57 19.6 D0547G96
XL8D89E C2016 06 08.29626 13 39 11.37 -01 57 05.9 D0547G96
XL8D89E KC2016 06 09.18148 13 50 07.58 -00 15 27.1 D0547291
XL8D89E KC2016 06 09.18248 13 50 07.74 -00 15 20.1 20.4 R D0547291
XL8D89E HC2016 06 09.18334 13 50 07.91 -00 15 15.7 D0547691
XL8D89E KC2016 06 09.18347 13 50 08.00 -00 15 13.3 20.2 R D0547291
XL8D89E HC2016 06 09.18669 13 50 08.53 -00 14 52.4 D0547691
XL8D89E C2016 06 09.21674 13 50 12.95 -00 11 34.9 21.1 V D0547G96
XL8D89E C2016 06 09.21862 13 50 13.30 -00 11 22.7 21.3 V D0547G96
XL8D89E C2016 06 09.22055 13 50 13.72 -00 11 09.9 21.6 V D0547G96
XL8D89E C2016 06 09.22243 13 50 14.05 -00 10 56.6 20.7 V D0547G96
XL8D89E KC2016 06 09.89380013 59 02.349+01 21 28.31 22.0 RtD0547Y28
XL8D89E KC2016 06 09.89807113 59 02.986+01 21 57.46 21.5 RtD0547Y28
XL8D89E KC2016 06 12.04421414 22 14.379+05 18 10.43 19.9 RtD0547Y28
XL8D89E KC2016 06 12.04769814 22 14.863+05 18 31.74 19.9 RtD0547Y28
XL8D89E C2016 06 20.41322916 03 25.232+18 24 03.44 20.3 Rt F51
XL8D89E C2016 06 20.42583116 03 28.304+18 24 52.01 20.3 Rt F51
XL8D89E C2016 06 20.43835916 03 31.600+18 25 38.00 20.1 Rt F51
XL8D89E C2016 06 20.45088316 03 35.153+18 26 21.47 20.4 Rt F51
XL8D89E C2016 07 04.92810519 30 38.521+27 41 21.31 21.0 RqD0549J04
XL8D89E C2016 07 04.93739319 30 43.267+27 41 39.75 20.2 RqD0549J04
XL8D89E C2016 07 04.93785719 30 43.517+27 41 40.71 qD0549J04
XL8D89E C2016 07 04.93925119 30 44.239+27 41 43.03 19.9 RqD0549J04
XL8D89E C2016 07 04.93971619 30 44.414+27 41 43.87 20.2 RqD0549J04
XL8D89E C2016 07 04.94018219 30 44.684+27 41 44.76 19.6 RqD0549J04
XL8D89E C2016 07 04.94064719 30 44.870+27 41 45.95 19.4 RqD0549J04
XL8D89E C2016 07 11.39609 21 03 16.30 +23 32 22.3 20.2 V D0549G96
XL8D89E C2016 07 11.40347 21 03 18.53 +23 31 52.0 20.2 V D0549G96
XL8D89E C2016 07 11.41077 21 03 20.77 +23 31 22.0 20.0 V D0549G96
XL8D89E C2016 07 11.41806 21 03 23.01 +23 30 49.0 20.3 V D0549G96
XL8D89E tC2016 07 17.44326222 27 07.164+15 34 29.82 20.7 Rt F51
XL8D89E tC2016 07 17.45531322 27 10.980+15 33 37.50 20.5 Rt F51
XL8D89E tC2016 07 17.46731222 27 14.459+15 32 43.80 20.2 Rt F51
XL8D89E C2016 10 05.14142 21 42 36.29 +24 52 48.3 20.9 V D0551G96
XL8D89E C2016 10 05.14628 21 42 37.80 +24 52 18.3 20.6 V D0551G96
XL8D89E C2016 10 05.15107 21 42 39.20 +24 51 48.7 20.6 V D0551G96
XL8D89E C2016 10 05.15589 21 42 40.66 +24 51 18.4 20.6 V D0551G96
XL8D89E C2016 10 05.19820 21 42 53.19 +24 46 29.9 20.8 V D0551G96
XL8D89E C2016 10 05.20014 21 42 53.81 +24 46 15.7 20.4 V D0551G96
XL8D89E C2016 10 05.20207 21 42 54.42 +24 46 01.7 20.6 V D0551G96
XL8D89E C2016 10 05.20399 21 42 54.89 +24 45 47.3 20.9 V D0551G96
XL8D89E C2017 02 02.46041 09 18 19.111-16 34 16.19 19.6 wUD0554F51
XL8D89E C2017 02 02.47215 09 18 27.108-16 31 16.63 19.7 wUD0554F51
XL8D89E C2017 02 02.48393 09 18 35.211-16 28 13.34 19.6 wUD0554F51
XL8D89E C2017 05 16.15618 13 03 09.48 +23 07 43.9 20.0 VqD0556G96
XL8D89E C2017 05 16.16043 13 03 13.54 +23 08 37.0 19.8 VqD0556G96
XL8D89E C2017 05 16.16469 13 03 17.57 +23 09 29.9 19.6 VqD0556G96
XL8D89E C2017 05 16.16894 13 03 21.63 +23 10 21.8 19.9 VqD0556G96
XL8D89E CK181102:00404464 074.17765 -13.62955 20.0 GV J95
XL8D89E CK181102:01030350 074.21204 -13.55853 20.2 GV J95
XL8D89E CK181102:01212264 074.23948 -13.49997 19.9 GV J95
Station data:
(291) LPL/Spacewatch II (N31.961669 W111.599905) US/Arizona. Observers J.
V. Scotti, R. S. McMillan. 1.8-m f/2.7 reflector + CCD.
(691) Steward Observatory, Kitt Peak - Spacewatch (N31.962174 W111.600327)
US/Arizona. Observer J. V. Scotti. 0.9-m f/3 reflector + CCD.
(F51) Pan-STARRS 1, Haleakala (N20.707235 W156.255910) US/Hawaii.
Observers B. Gibson, T. Goggia, N. Primak, A. Schultz, M. Willman.
Measurer M. Micheli. 1.8-m Ritchey-Chrétien + CCD.
(G96) Mt. Lemmon Survey (N32.442754 W110.788720) US/Arizona. Observer G.
J. Leonard. Measurers E. J. Christensen, D. C. Fuls, A. R. Gibbs, A. D.
Grauer, J. A. Johnson, R. A. Kowalski, S. M. Larson, G. J. Leonard, R. G.
Matheny, R. L. Seaman, F. C. Shelly. 1.5-m reflector + 10K CCD.
(J04) ESA Optical Ground Station, Tenerife (N28.300924 W16.511830) Canary
Islands (Spain). Observer D. Abreu. Measurers M. Micheli, D. Koschny, E.
Schwab, M. Busch, A. Knöfel. 1.0-m f/4.4 reflector + CCD.
(J95) Great Shefford (N51.474969 W1.447003) UK. Observer P. Birtwhistle.
(Y28) OASI, Nova Itacuruba (S8.788708 W38.687400) Brazil. Observers J. S.
Silva, D. Lazzaro, F. Monteiro, R. Souza, T. Rodrigues. Measurers M.
Micheli, J. S. Silva. 1.0-m f/7 reflector + CCD.
Orbital elements: XL8D89E
Perigee 2018 Jul 26.329314 +/- 0.00437 TT = 7:54:12 (JD 2458325.829314)
Epoch 2018 Jul 1.0 TT; AMR 0.028884 +/- 1.61e-5 m2/kg Gray
M 234.7643857903 +/- 0.022 (J2000 equator)
n 4.9442954549 +/- 1.94e-5 Peri. 244.4599096 +/- 0.015
a736547.16618 +/- 1.92 Node 100.9859742 +/- 0.0016
e 0.177721456 +/- 1.99e-5 Incl. 50.6946864 +/- 0.00046
P 72.81d H 30.0 G 0.15 U 5.5
q 605646.93087 +/- 16.1 Q 867447.40148 +/- 12.6
63 of 73 observations 2016 June 7-2018 Nov. 2; mean residual 10".022
Residuals in arcseconds: 151117 F51( 518+ 295-) 160609 291 7.94+ 6.08- 160711 G96 11.1+ 10.0- 151117 F51( 518+ 295-) 160609 691 8.27+ 7.56- 160711 G96 10.8+ 11.3- 160129 F51( 996+ 521-) 160609 291 9.29+ 6.07- 160717 F51 15.8+ 11.2- 160129 F51( 996+ 520-) 160609 691 8.91+ 7.23- 160717 F51 16.1+ 11.2- 160129 F51( 995+ 520-) 160609 G96 8.37+ 5.50- 160717 F51 16.0+ 11.1- 160129 F51( 995+ 520-) 160609 G96 8.06+ 6.19- 161005 G96 13.0- 3.38+ 160330 F51( 112- 69.7-) 160609 G96 8.58+ 6.62- 161005 G96 12.6- 2.96+ 160330 F51( 112- 69.9-) 160609 G96 7.86+ 6.21- 161005 G96 13.2- 3.02+ 160330 F51( 113- 68.8-) 160609 Y28 5.60+ 8.07- 161005 G96 13.0- 3.08+ 160330 F51( 113- 70.2-) 160609 Y28 5.16+ 8.17- 161005 G96 13.3- 3.27+ 160607 G96 16.1+ .864- 160612 Y28 .666- 12.8- 161005 G96 12.9- 3.26+ 160607 G96 17.0+ .373- 160612 Y28 1.10- 12.9- 161005 G96 12.6- 3.46+ 160607 G96 16.7+ 1.59- 160620 F51 15.1- 19.5- 161005 G96 14.1- 3.26+ 160607 G96 16.8+ .475- 160620 F51 15.0- 19.5- 170202 F51 2.49- 1.40- 160607 G96 16.9+ .057+ 160620 F51 14.8- 19.5- 170202 F51 2.40- 1.27- 160607 G96 17.5+ 1.28- 160620 F51 15.1- 19.7- 170202 F51 2.42- 1.23- 160608 G96 12.4+ 3.39- 160704 J04 .238- 10.9- 170516 G96 11.6+ 12.7- 160608 G96 12.4+ 3.16- 160704 J04 .515- 10.6- 170516 G96 11.5+ 13.0- 160608 G96 12.9+ 3.59- 160704 J04 .273- 10.5- 170516 G96 11.1+ 13.2- 160608 G96 12.4+ 3.66- 160704 J04 .114+ 10.8- 170516 G96 11.6+ 13.7- 160608 G96 13.0+ 3.45- 160704 J04 .616- 10.8- 181102 J95 4.42- .165+ 160608 G96 12.3+ 4.57- 160704 J04 .082- 10.8- 181102 J95 4.37- 1.03+ 160608 G96 12.4+ 3.35- 160704 J04 .650- 10.4- 181102 J95 4.11- .676+ 160608 G96 12.4+ 3.15- 160711 G96 11.1+ 10.6- 160609 291 8.11+ 6.23- 160711 G96 11.1+ 10.8- Ephemerides (geocentric): Date (UTC) RA Dec delta elong mag " sig PA ---- -- -- ------------- ----------- ------ ----- --- ---- --- 2018 11 01 04 37 52.105 -18 00 07.70 656514 133.8 20.0 4.06 45 2018 11 02 04 55 38.537 -13 16 20.32 661992 133.9 20.0 1.40 51 2018 11 03 05 12 15.944 -08 32 53.00 668694 133.7 20.0 1.19 27 2018 11 04 05 27 58.059 -03 52 28.72 676509 133.2 20.1 3.54 35 2018 11 05 05 42 56.918 +00 42 41.48 685311 132.3 20.1 5.72 37 2018 11 06 05 57 23.136 +05 10 53.68 694972 131.2 20.2 7.70 38 2018 11 07 06 11 26.177 +09 30 46.52 705358 129.9 20.2 9.46 38 2018 11 08 06 25 14.603 +13 41 17.08 716336 128.4 20.3 11.0 39 2018 11 09 06 38 56.277 +17 41 37.21 727769 126.8 20.4 12.4 40 2018 11 10 06 52 38.531 +21 31 10.44 739521 125.0 20.5 13.5 42 2018 11 11 07 06 28.298 +25 09 29.16 751457 123.2 20.6 14.5 43 2018 11 12 07 20 32.205 +28 36 12.27 763444 121.4 20.7 15.3 45 2018 11 13 07 34 56.642 +31 51 02.85 775354 119.5 20.7 16.0 47 2018 11 14 07 49 47.782 +34 53 46.21 787061 117.5 20.8 16.6 49 2018 11 15 08 05 11.561 +37 44 08.00 798448 115.6 20.9 17.0 52 2018 11 16 08 21 13.593 +40 21 52.68 809403 113.6 21.0 17.3 54 2018 11 17 08 37 59.016 +42 46 42.23 819822 111.7 21.1 17.6 57 2018 11 18 08 55 32.255 +44 58 15.28 829608 109.7 21.2 17.7 61 2018 11 19 09 13 56.686 +46 56 06.74 838669 107.7 21.3 17.9 64 2018 11 20 09 33 14.225 +48 39 48.02 846924 105.7 21.4 17.9 68 2018 11 21 09 53 24.864 +50 08 47.92 854294 103.7 21.4 17.9 72 2018 11 22 10 14 26.216 +51 22 34.36 860710 101.6 21.5 17.9 76 2018 11 23 10 36 13.163 +52 20 36.65 866108 99.5 21.6 17.9 81 2018 11 24 10 58 37.737 +53 02 28.31 870433 97.4 21.7 17.8 86 2018 11 25 11 21 29.316 +53 27 49.90 873641 95.3 21.8 17.7 90 2018 11 26 11 44 35.214 +53 36 31.42 875697 93.1 21.9 17.6 95 2018 11 27 12 07 41.596 +53 28 33.80 876578 90.9 22.0 17.4 100 2018 11 28 12 30 34.600 +53 04 09.09 876275 88.6 22.1 17.3 105 2018 11 29 12 53 01.444 +52 23 39.42 874791 86.2 22.2 17.1 110 2018 11 30 13 14 51.317 +51 27 34.77 872142 83.8 22.3 16.9 115 2018 12 01 13 35 55.938 +50 16 30.22 868356 81.3 22.4 16.7 119 2018 12 02 13 56 09.736 +48 51 02.91 863471 78.7 22.5 16.5 123 2018 12 03 14 15 29.722 +47 11 49.28 857535 76.1 22.6 16.2 128 2018 12 04 14 33 55.154 +45 19 22.75 850607 73.3 22.7 16.0 131 2018 12 05 14 51 27.104 +43 14 12.13 842752 70.5 22.9 15.7 135 2018 12 06 15 08 08.018 +40 56 40.65 834047 67.5 23.0 15.4 138 2018 12 07 15 24 01.325 +38 27 05.68 824578 64.5 23.2 15.0 141 2018 12 08 15 39 11.117 +35 45 38.99 814439 61.3 23.4 14.6 144 2018 12 09 15 53 41.906 +32 52 27.62 803741 58.0 23?? 14.2 147 2018 12 10 16 07 38.457 +29 47 35.14 792602 54.5 23?? 13.7 149