"Pseudo-MPEC" for ZTF02Rj

Created 2019 Jan 31 18:03:46 UT using Find_Orb

Click here for an explanation of pseudo-MPECs

I don't have an ID for this object. I've computed TLEs running back about a month and a month into the future. The former did not get me any precoveries, but the latter stands some chance of letting us ID the object should it reappear on NEOCP.

You'll notice that the residuals are pretty high. Adding solar radiation pressure makes it look just fine... except that it winds up with a fairly high negative pressure. I don't think it's an empty trash bag object made of antimatter, but I am currently baffled. (This behavior may well mean it'll wander such that my TLEs will soon be useless.)

It's possible that this is a recovery of the odd object that appeared on NEOCP eight times in late 2017. There is at least a family resemblance between the orbits. But with over a year between them and lots of non-gravs, I can't really prove anything.

 
 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