"Pseudo-MPEC" for ZTF01sS = ZTF01sX = ZTF01wl

Created 2018 Dec 11 4:41:11 UT using Find_Orb

Click here for an explanation of pseudo-MPECs

TLEs are available for this object, and for some of the other objects on these pages. Be warned that, for reasons discussed below, the TLEs for this particular object may not be all that good.

This is a small, very light object of the sort I've been referring to as Empty Trash-Bag Objects, or ETBOs.

The Zwicky Transient Facility has found at least four others, all very strongly perturbed by solar radiation pressure. The brightness of this object suggests it's about a meter across; so its area/mass ratio of 36 m2/kg would give it a mass of a mere 20 grams or so. (Both the size and AMR are very approximate, especially the size; it could be a smaller, very reflective object or a bigger, not very reflective object. And in fact, it's probably a loose bit of insulating foil, and therefore very reflective. So the mass, which depends on your guess of size and AMR, is even more approximate. A ballpark guess, actually.)

 
 Astrometry: 
     ZTF01sS  C2018 12 04.23207704 26 01.50 -01 51 09.5          16.52RUNEOCPI41
     ZTF01sS  C2018 12 04.23242404 26 06.98 -01 50 20.1          16.52RUNEOCPI41
     ZTF01sS  C2018 12 04.27440504 36 57.33 -00 11 57.1          16.50RUNEOCPI41
     ZTF01sS  C2018 12 04.27475204 37 02.49 -00 11 10.2          16.50RUNEOCPI41
     ZTF01sX  C2018 12 05.25178904 41 25.35 +00 03 15.8          16.44RUNEOCPI41
     ZTF01sX  C2018 12 05.25213604 41 30.73 +00 04 04.3          16.44RUNEOCPI41
     ZTF01sX  C2018 12 05.27547004 47 30.52 +00 57 56.6          17.18gUNEOCPI41
     ZTF01sX  C2018 12 05.27581704 47 35.84 +00 58 44.5          17.18gUNEOCPI41
     ZTF01wl  C2018 12 10.31651105 55 32.12 +08 20 54.2          16.30RUNEOCPI41
     ZTF01wl  C2018 12 10.31685905 55 39.19 +08 21 45.9          16.30RUNEOCPI41
     ZTF01wl  C2018 12 10.31925705 56 28.92 +08 27 50.9          16.27RUNEOCPI41
     ZTF01wl  C2018 12 10.31960405 56 36.01 +08 28 42.9          16.27RUNEOCPI41

Station data:
(I41) Palomar Mountain--ZTF  (N33.357340 W116.859780)  US/California. 1.2-m
   f/2.44 Oschin Schmidt + CCD.

Orbital elements:  ZTF01sS = ZTF01sX = ZTF01wl
   Perigee 2018 Dec 3.800834 +/- 0.000341 TT = 19:13:12 (JD 2458456.300834)
Epoch 2018 Dec  4.0 TT; AMR 35.982 +/- 0.167 m2/kg           Gray
M  73.640394184 +/- 0.12            (J2000 equator)
n 369.744153878 +/- 0.00759         Peri.  188.001779 +/- 0.030
a 41495.65544 +/- 0.568             Node    61.827722 +/- 0.007
e   0.69554250 +/- 0.000193         Incl.   22.723982 +/- 0.0018
P1402.02m/0.974d           H 32.8   G  0.15   U  9.5
q 12633.66328 +/- 8.09    Q 70357.64759 +/- 7.47
From 12 observations 2018 Dec. 4-10; mean residual 2".959
Residuals in arcseconds: 
181204 I41 1.44- .466+    181205 I41 5.79+ 2.21+    181210 I41 1.54+ .030+
181204 I41 1.72- .294+    181205 I41 5.69+ 2.41+    181210 I41 .227- .950-
181204 I41 3.66- 4.78-    181205 I41 .686+ 2.76+    181210 I41 .073- .559+
181204 I41 5.59- 6.07-    181205 I41 .472+ 2.81+    181210 I41 2.02- .110-

Ephemerides (geocentric):
Date (UTC) HH   RA              Dec         delta  elong  mag " sig PA
---- -- -- --  -------------   -----------  ------ -----  --- ---- ---
2018 12 10 00  03 55 08.910   -01 18 51.92   65785 150.3 17.3 39.9  68
2018 12 10 01  04 10 52.995   +00 23 27.10   67979 153.8 17.2 30.2  68
2018 12 10 02  04 25 48.283   +02 00 23.05   69413 156.9 17.2 22.0  69
2018 12 10 03  04 40 18.135   +03 33 55.87   70113 159.7 17.1 14.9  70
2018 12 10 04  04 54 42.571   +05 05 46.47   70089 162.0 17.0 8.74  72
2018 12 10 05  05 09 20.803   +06 37 26.69   69342 163.7 17.0 3.35  79
2018 12 10 06  05 24 33.527   +08 10 27.29   67859 164.7 16.9 1.54  46
2018 12 10 07  05 40 45.610   +09 46 25.49   65615 164.7 16.8 5.43  63
2018 12 10 08  05 58 30.056   +11 27 13.28   62570 163.3 16.7 8.46  67
2018 12 10 09  06 18 34.913   +13 15 07.14   58666 160.6 16.7 10.1  69
2018 12 10 10  06 42 16.872   +15 12 58.13   53817 156.5 16.6 9.52  71
2018 12 10 11  07 11 51.659   +17 24 10.63   47905 150.5 16.6 4.28  74
2018 12 10 12  07 51 52.697   +19 51 17.51   40762 141.9 16.5 11.8  76
2018 12 10 13  08 53 18.205   +22 25 02.49   32174 128.5 16.3 59.5  82
2018 12 10 14  10 49 52.973   +23 09 40.04   22069 102.9 16.3  240  94
2018 12 10 15  15 30 48.940   +03 58 34.00   13230  36.0 19?? 1041 113
2018 12 10 16  21 43 49.604   -23 24 01.28   18201  62.5 17.8  723  92
2018 12 10 17  00 21 57.338   -19 54 49.23   28612  97.9 17.0  333  77
2018 12 10 18  01 33 14.637   -15 10 08.04   37778 114.8 17.1  200  72
2018 12 10 19  02 16 23.884   -11 27 10.26   45424 125.4 17.1  138  70
2018 12 10 20  02 47 11.209   -08 29 02.95   51763 133.1 17.2  101  69
2018 12 10 21  03 11 24.203   -06 00 18.53   56983 139.0 17.3 77.3  68
2018 12 10 22  03 31 43.108   -03 51 15.00   61218 144.0 17.3 59.9  68
2018 12 10 23  03 49 34.200   -01 55 43.14   64565 148.3 17.3 46.6  68
2018 12 11 00  04 05 49.730   -00 09 35.87   67092 152.0 17.2 35.9  68
2018 12 11 01  04 21 04.698   +01 30 02.55   68845 155.4 17.2 27.0  68
2018 12 11 02  04 35 44.949   +03 05 25.45   69854 158.4 17.1 19.4  69
2018 12 11 03  04 50 11.639   +04 38 21.28   70137 161.0 17.1 12.9  70
2018 12 11 04  05 04 44.112   +06 10 25.23   69698 163.1 17.0 7.19  72
2018 12 11 05  05 19 42.230   +07 43 07.89   68530 164.6 16.9 2.29  80
2018 12 11 06  05 35 28.815   +09 18 02.79   66615 165.2 16.8 1.95  57
2018 12 11 07  05 52 32.952   +10 56 54.12   63917 164.5 16.7 5.17  66
2018 12 11 08  06 11 35.389   +12 41 45.62   60388 162.5 16.7 7.16  69
2018 12 11 09  06 33 38.648   +14 35 10.22   55955 159.0 16.6 7.17  71
2018 12 11 10  07 00 28.404   +16 40 15.13   50515 153.8 16.6 3.48  75
2018 12 11 11  07 35 25.192   +19 00 06.48   43924 146.5 16.5 8.18  73
2018 12 11 12  08 25 52.735   +21 32 53.95   35985 135.5 16.4 40.6  79
2018 12 11 13  09 52 08.969   +23 34 09.68   26508 116.6 16.2  146  88
2018 12 11 14  13 03 50.414   +17 26 35.48   16209  73.1 16.9  626 106
2018 12 11 15  19 30 30.524   -18 41 59.57   14417  32.3 20?? 1101 105
2018 12 11 16  23 33 21.207   -22 08 09.74   24248  85.8 17.2  462  82
2018 12 11 17  01 09 10.915   -17 03 11.98   34052 108.1 17.0  252  74
2018 12 11 18  02 01 20.738   -12 52 23.01   42312 120.8 17.1  165  70
2018 12 11 19  02 36 26.357   -09 35 31.27   49175 129.5 17.2  119  69
2018 12 11 20  03 03 03.742   -06 54 16.60   54847 136.2 17.3 89.5  68
2018 12 11 21  03 24 51.292   -04 36 35.43   59484 141.6 17.3 69.2  68
2018 12 11 22  03 43 39.750   -02 34 56.18   63198 146.1 17.3 54.0  67
2018 12 11 23  04 00 33.103   -00 44 24.22   66065 150.2 17.3 42.0  67
2018 12 12 00  04 16 12.458   +00 58 24.31   68141 153.7 17.2 32.3  68
2018 12 12 01  04 31 06.935   +02 35 59.64   69463 157.0 17.2 24.1  68
2018 12 12 02  04 45 39.334   +04 10 20.13   70053 159.8 17.1 17.2  69
2018 12 12 03  05 00 09.541   +05 43 06.09   69921 162.3 17.0 11.1  69
2018 12 12 04  05 14 57.001   +07 15 49.48   69065 164.2 16.9 5.98  71
2018 12 12 05  05 30 23.049   +08 50 01.77   67470 165.4 16.8 1.62  77
2018 12 12 06  05 46 53.750   +10 27 21.39   65110 165.4 16.8 1.87  64
2018 12 12 07  06 05 04.234   +12 09 41.82   61943 164.1 16.7 4.16  69
2018 12 12 08  06 25 46.371   +13 59 20.67   57906 161.2 16.6 4.71  72
2018 12 12 09  06 50 24.193   +15 59 07.11   52911 156.8 16.6 2.23  79
2018 12 12 10  07 21 28.992   +18 12 09.70   46833 150.5 16.5 6.39  71
2018 12 12 11  08 04 12.295   +20 39 40.28   39500 141.2 16.4 29.4  77