"Pseudo-MPEC" for ZTF02Rj
Created 2019 Jan 31 18:03:46 UT using Find_Orb
Click here for an explanation of pseudo-MPECs
At the time these observations were made, I thought it possible that this was a recovery of the odd object that appeared on NEOCP eight times in late 2017. There was at least a family resemblance between the orbits. But with over a year between them and lots of non-gravs, I couldn't really prove anything.
However, with the recovery of the object in April 2019, linked to other observations in November 2018, it's pretty clear that we're seeing one object with large non-gravitational forces pushing it around.
Astrometry:
ZTF02Rj C2019 01 31.21893108 00 33.23 +19 24 19.4 ~1V6m 17.62RUNEOCPI41
ZTF02Rj C2019 01 31.21927808 00 35.99 +19 24 03.8 ~1V6m 17.62RUNEOCPI41
ZTF02Rj C2019 01 31.22136908 00 53.05 +19 22 29.4 ~1V6m 17.76RUNEOCPI41
ZTF02Rj C2019 01 31.22171608 00 55.89 +19 22 13.3 ~1V6m 17.76RUNEOCPI41
ZTF02Rj C2019 01 31.23866208 03 11.22 +19 09 05.0 ~1V73 17.86RUNEOCPI41
ZTF02Rj C2019 01 31.23900908 03 13.91 +19 08 48.9 ~1V73 17.86RUNEOCPI41
ZTF02Rj C2019 01 31.24622308 04 10.04 +19 03 02.2 ~1V7X 17.77RUNEOCPI41
ZTF02Rj C2019 01 31.24657008 04 12.68 +19 02 45.6 ~1V7X 17.77RUNEOCPI41
ZTF02Rn C2019 01 31.28164008 08 35.12 +18 33 12.9 ~1VI1 17.68RUNEOCPI41
ZTF02Rn C2019 01 31.28198708 08 37.61 +18 32 54.3 ~1VI1 17.68RUNEOCPI41
ZTF02Rj CK190131:07100474 122.16835 +18.25611 17.7 GV H01
ZTF02Rj CK190131:07201509 122.38189 +18.14251 17.7 GV H01
ZTF02Rj KC2019 01 31.30970 08 10 51.11 +18 12 06.0 18.8 R 291
ZTF02Rj KC2019 01 31.31093 08 10 59.78 +18 10 55.4 18.3 R 291
ZTF02Rj KC2019 01 31.31223 08 11 08.94 +18 09 40.2 18.0 R 291
ZTF02Rj CK190131:07301405 122.59107 +18.02970 17.7 GV H01
ZTF02Rj CK190131:07400200 122.79620 +17.91766 17.8 GV H01
ZTF02Rj CK190131:08344721 123.94830 +17.26987 17.9 GV H01
ZTF02Rj CK190131:08440253 124.14531 +17.15710 17.6 GV H01
ZTF02Rn C2019 01 31.36924208 18 54.62 +17 09 23.7 ~1VI1 17.79RUNEOCPI41
ZTF02Rn C2019 01 31.36958908 18 57.05 +17 09 02.6 ~1VI1 17.79RUNEOCPI41
ZTF02Rj CK190131:08594591 124.48257 +16.96335 17.6 GV H01
ZTF02Rj CK190131:09101092 124.70780 +16.83377 17.8 GV H01
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.
(H01) Magdalena Ridge Observatory, Socorro (N33.984833 W107.189333) US/New
Mexico. Observers W. H. Ryan, E. V. Ryan. Measurer W. H. Ryan.
(I41) Palomar Mountain--ZTF (N33.357340 W116.859780) US/California. 1.2-m
f/2.44 Oschin Schmidt + CCD.
Orbital elements: ZTF02Rj
Perigee 2019 Jan 30.437908 +/- 0.00138 TT = 10:30:35 (JD 2458513.937908)
Epoch 2019 Jan 31.0 TT = JDT 2458514.5 Gray
M 91.15623794 +/- 0.23 (J2000 equator)
n 162.17314055 +/- 0.149 Peri. 323.72089 +/- 0.06
a 71881.5701 +/- 44 Node 346.49700 +/- 0.0028
e 0.6754524 +/- 0.000347 Incl. 26.53577 +/- 0.0033
P3196.52m/2.220d H 33.2 G 0.15 U 11.5
q 23328.9898 +/- 33.9 Q 120434.150 +/- 66.2
From 23 observations 2019 Jan. 31 (3.9 hr); mean residual 1".105
Residuals in arcseconds: 190131 I41 2.05- .908- 190131 I41 .596- .787+ 190131 H01 .360+ .013- 190131 I41 3.18- .827- 190131 I41 1.12- .462+ 190131 H01 .188+ .034- 190131 I41 3.25- .426- 190131 H01 .047+ .166- 190131 H01 .100- .213+ 190131 I41 3.02- .743- 190131 H01 .259+ .172- 190131 I41 .123- .198+ 190131 I41 1.80- .659- 190131 291 1.01+ .430- 190131 I41 .362- .532+ 190131 I41 2.19- .254- 190131 291 .578+ .131- 190131 H01 .176- .035- 190131 I41 1.32- .555- 190131 291 .131+ .223- 190131 H01 .831- .132+ 190131 I41 1.84- .336- 190131 H01 .410+ .052- Ephemerides (geocentric): Date (UTC) HH RA Dec delta elong mag " sig PA ---- -- -- -- ------------- ----------- ------ ----- --- ---- --- 2019 01 31 00 07 05 10.805 +23 25 41.68 98713 154.4 18.5 5.99 84 2019 01 31 01 07 15 59.584 +22 50 16.12 102031 156.9 18.5 4.60 85 2019 01 31 02 07 26 03.987 +22 14 30.06 105042 159.2 18.5 3.54 89 2019 01 31 03 07 35 31.399 +21 38 30.39 107760 161.4 18.5 2.72 95 2019 01 31 04 07 44 27.799 +21 02 20.43 110194 163.5 18.4 2.06 104 2019 01 31 05 07 52 58.111 +20 26 01.11 112354 165.6 18.4 1.53 119 2019 01 31 06 08 01 06.450 +19 49 31.67 114246 167.5 18.4 1.19 146 2019 01 31 07 08 08 56.307 +19 12 50.17 115879 169.4 18.3 1.16 2 2019 01 31 08 08 16 30.689 +18 35 53.73 117256 171.2 18.3 1.53 33 2019 01 31 09 08 23 52.229 +17 58 38.73 118384 172.9 18.2 2.21 53 2019 01 31 10 08 31 03.269 +17 21 00.93 119264 174.6 18.2 3.12 65 2019 01 31 11 08 38 05.924 +16 42 55.51 119901 176.2 18.1 4.25 74 2019 01 31 12 08 45 02.146 +16 04 17.08 120295 177.4 Sha 5.63 80 2019 01 31 13 08 51 53.764 +15 24 59.65 120448 177.9 Sha 7.30 85 2019 01 31 14 08 58 42.529 +14 44 56.56 120361 177.1 20.1 9.29 90 2019 01 31 15 09 05 30.154 +14 04 00.43 120033 175.7 18.1 11.7 93 2019 01 31 16 09 12 18.350 +13 22 02.98 119464 174.1 18.2 14.5 96 2019 01 31 17 09 19 08.861 +12 38 54.96 118650 172.5 18.3 17.8 99 2019 01 31 18 09 26 03.510 +11 54 25.88 117591 170.7 18.3 21.7 101 2019 01 31 19 09 33 04.237 +11 08 23.78 116283 168.9 18.4 26.4 103 2019 01 31 20 09 40 13.158 +10 20 34.95 114720 167.1 18.4 31.9 104 2019 01 31 21 09 47 32.623 +09 30 43.47 112899 165.1 18.4 38.4 106 2019 01 31 22 09 55 05.302 +08 38 30.74 110813 163.1 18.5 46.1 107 2019 01 31 23 10 02 54.278 +07 43 34.75 108454 161.1 18.5 55.3 109 2019 02 01 00 10 11 03.193 +06 45 29.25 105814 158.9 18.5 66.3 110 2019 02 01 01 10 19 36.425 +05 43 42.51 102883 156.6 18.5 79.6 111 2019 02 01 02 10 28 39.345 +04 37 35.72 99649 154.1 18.5 95.8 112 2019 02 01 03 10 38 18.682 +03 26 20.82 96098 151.5 18.5 116 112 2019 02 01 04 10 48 43.055 +02 08 57.37 92215 148.6 18.5 141 113 2019 02 01 05 11 00 03.777 +00 44 08.20 87982 145.5 18.5 172 114 2019 02 01 06 11 12 36.112 -00 49 46.92 83376 142.1 18.5 212 114 2019 02 01 07 11 26 41.313 -02 35 00.44 78375 138.2 18.4 265 114 2019 02 01 08 11 42 50.089 -04 34 30.60 72952 133.7 18.4 337 114 2019 02 01 09 12 01 48.817 -06 52 20.88 67077 128.5 18.4 437 114 2019 02 01 10 12 24 51.394 -09 34 05.56 60723 122.3 18.3 583 114 2019 02 01 11 12 54 03.565 -12 47 10.78 53869 114.5 18.3 808 113 2019 02 01 12 13 33 16.947 -16 40 03.47 46533 104.3 18.3 1176 110 2019 02 01 13 14 30 16.223 -21 14 04.61 38833 90.1 18.5 1828 106 2019 02 01 14 16 01 07.052 -25 37 17.64 31221 68.9 19.0 3046 97 2019 02 01 15 18 29 13.034 -25 01 27.21 25104 35.6 21?? 5032 81 2019 02 01 16 21 33 03.202 -11 08 21.77 23435 10.2 30?? 6074 66 2019 02 01 17 00 01 53.282 +06 53 04.93 27504 51.2 20?? 4601 64 2019 02 01 18 01 44 37.994 +17 41 08.85 34571 78.4 18.7 3027 70 2019 02 01 19 02 56 22.710 +22 52 02.27 42319 95.9 18.4 2086 76 2019 02 01 20 03 48 41.284 +25 14 09.32 49884 108.0 18.3 1541 82 2019 02 01 21 04 28 33.334 +26 14 01.88 57011 117.0 18.4 1205 86 2019 02 01 22 05 00 08.735 +26 31 51.46 63640 124.0 18.4 984 90 2019 02 01 23 05 26 00.232 +26 27 00.57 69777 129.8 18.4 829 93 2019 02 02 00 05 47 44.757 +26 09 23.00 75447 134.6 18.5 717 95 2019 02 02 01 06 06 26.243 +25 44 18.88 80679 138.8 18.5 633 97 2019 02 02 02 06 22 48.399 +25 14 48.67 85500 142.5 18.5 567 99 2019 02 02 03 06 37 22.084 +24 42 37.73 89937 145.7 18.5 516 100 2019 02 02 04 06 50 29.720 +24 08 49.11 94012 148.7 18.5 474 102 2019 02 02 05 07 02 28.016 +23 34 01.10 97746 151.5 18.5 440 103 2019 02 02 06 07 13 29.707 +22 58 36.97 101154 154.0 18.5 412 104 2019 02 02 07 07 23 44.699 +22 22 50.69 104253 156.4 18.5 388 105 2019 02 02 08 07 33 20.844 +21 46 50.19 107054 158.7 18.5 369 106 2019 02 02 09 07 42 24.470 +21 10 39.53 109568 160.8 18.5 353 106 2019 02 02 10 07 51 00.764 +20 34 20.09 111806 162.8 18.5 339 107 2019 02 02 11 07 59 14.041 +19 57 51.46 113775 164.8 18.5 328 108 2019 02 02 12 08 07 07.945 +19 21 11.90 115482 166.7 18.4 319 108 2019 02 02 13 08 14 45.604 +18 44 18.72 116933 168.5 18.4 312 109 2019 02 02 14 08 22 09.741 +18 07 08.47 118132 170.3 18.3 307 109 2019 02 02 15 08 29 22.767 +17 29 37.03 119083 172.0 18.3 303 110 2019 02 02 16 08 36 26.853 +16 51 39.73 119790 173.7 18.2 300 110 2019 02 02 17 08 43 23.986 +16 13 11.31 120254 175.3 18.1 299 111 2019 02 02 18 08 50 16.021 +15 34 05.96 120477 176.7 18.1 300 111 2019 02 02 19 08 57 04.723 +14 54 17.21 120459 177.6 Sha 302 112 2019 02 02 20 09 03 51.809 +14 13 37.88 120201 177.4 Sha 306 112 2019 02 02 21 09 10 38.981 +13 32 00.00 119702 176.3 18.1 311 112 2019 02 02 22 09 17 27.966 +12 49 14.60 118960 174.9 18.1 318 113 2019 02 02 23 09 24 20.554 +12 05 11.60 117973 173.2 18.2 327 113 2019 02 03 00 09 31 18.642 +11 19 39.51 116737 171.5 18.3 338 113 2019 02 03 01 09 38 24.285 +10 32 25.20 115250 169.7 18.3 351 114 2019 02 03 02 09 45 39.752 +09 43 13.47 113505 167.8 18.3 368 114 2019 02 03 03 09 53 07.602 +08 51 46.61 111497 165.8 18.4 387 114 2019 02 03 04 10 00 50.781 +07 57 43.74 109219 163.8 18.4 411 114 2019 02 03 05 10 08 52.743 +07 00 40.02 106663 161.7 18.4 439 115 2019 02 03 06 10 17 17.617 +06 00 05.54 103819 159.4 18.4 472 115 2019 02 03 07 10 26 10.442 +04 55 23.89 100675 157.0 18.4 513 115 2019 02 03 08 10 35 37.487 +03 45 50.12 97220 154.4 18.4 562 115 2019 02 03 09 10 45 46.731 +02 30 27.97 93437 151.6 18.4 623 116 2019 02 03 10 10 56 48.566 +01 08 05.97 89309 148.6 18.4 700 116 2019 02 03 11 11 08 56.894 -00 22 48.24 84816 145.3 18.4 796 116