"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