"Pseudo-MPEC" for ZD8FCAE = 2018 DM4
Created 2018 Feb 25 2:05:31 UT using Find_Orb
Click here for an explanation of pseudo-MPECs
This object was accidentally designated as "asteroid" 2018 DM4 by the Minor Planet Center, but the designation was retracted.
This object may have been recovered as ZFA6869 almost a month later, but the linkage is highly doubtful, especially since Peter Birtwhistle looked at the most likely follow-up location had the linkage been "real" and didn't find it.
Astrometry:
ZD8FCAE C2018 02 23.23539 09 27 21.05 +04 41 59.7 18.9 GUNEOCPG96
ZD8FCAE C2018 02 23.24576 09 27 48.77 +04 41 19.6 19.5 GUNEOCPG96
ZD8FCAE C2018 02 23.25092 09 28 02.35 +04 40 59.5 19.4 GUNEOCPG96
ZD8FCAE C2018 02 23.38506 09 33 46.05 +04 28 40.8 20.4 GUNEOCPI52
ZD8FCAE C2018 02 23.38554 09 33 47.44 +04 28 36.8 20.7 GUNEOCPI52
ZD8FCAE C2018 02 23.38579 09 33 48.11 +04 28 35.3 20.0 GUNEOCPI52
Station data:
(G96) Mt. Lemmon Survey (N32.442751 W110.788720) US/Arizona. Observers E.
J. Christensen, A. R. Gibbs, A. D. Grauer, R. E. Hill, J. A. Johnson, R.
A. Kowalski, S. M. Larson, F. C. Shelly. 1.5-m reflector + CCD.
(I52) Steward Observatory, Mt. Lemmon Station (N32.442544 W110.788920)
US/Arizona.
Orbital elements: ZD8FCAE
Perigee 2018 Feb 22.353920 +/- 0.0298 TT = 8:29:38 (JD 2458171.853920)
Epoch 2018 Feb 23.0 TT = JDT 2458172.5 Gray
M 62.34518 +/- 1.8 (J2000 equator)
n 96.49761506 +/- 5.12 Peri. 324.49934 +/- 0.7
a101607.504 +/- 3593 Node 13.96345 +/- 0.13
e 0.8425537 +/- 0.00534 Incl. 7.31772 +/- 0.031
P5372.05m/3.731d H 34.3 G 0.15 U 13.8
q 15997.7232 +/- 1081 Q 187217.286 +/- 6284
From 6 observations 2018 Feb. 23 (3.6 hr); mean residual 0".280
Residuals in arcseconds: 180223 G96 .115+ .104+ 180223 G96 .259+ .247+ 180223 I52 .340+ .320- 180223 G96 .374- .351- 180223 I52 .082- .463+ 180223 I52 .259- .143- Ephemerides (geocentric): Date (UTC) HH RA Dec delta r elong mag " sig PA ---- -- -- -- ------------ ------------ ------ ------ ----- --- ---- --- 2018 02 23 12 09 47 31.793 +05 22 28.25 168167 0.9906 169.5 20.2 197 66 2018 02 23 13 09 50 39.201 +05 18 23.06 170374 0.9906 170.2 20.2 226 70 2018 02 23 14 09 53 41.937 +05 14 20.56 172434 0.9906 170.8 20.2 255 73 2018 02 23 15 09 56 40.473 +05 10 20.41 174351 0.9907 171.3 20.2 287 75 2018 02 23 16 09 59 35.237 +05 06 22.28 176126 0.9907 171.9 20.2 319 77 2018 02 23 17 10 02 26.619 +05 02 25.86 177762 0.9907 172.4 20.2 354 79 2018 02 23 18 10 05 14.974 +04 58 30.85 179262 0.9907 172.9 20.2 390 80 2018 02 23 19 10 08 00.632 +04 54 36.98 180627 0.9907 173.3 20.2 428 82 2018 02 23 20 10 10 43.897 +04 50 43.96 181860 0.9908 173.7 20.2 469 83 2018 02 23 21 10 13 25.053 +04 46 51.53 182962 0.9908 174.0 20.2 512 84 2018 02 23 22 10 16 04.367 +04 42 59.41 183935 0.9908 174.3 20.2 558 85 2018 02 23 23 10 18 42.090 +04 39 07.35 184780 0.9908 174.5 20.2 607 86 2018 02 24 00 10 21 18.461 +04 35 15.09 185497 0.9908 174.7 20.2 660 86 2018 02 24 01 10 23 53.710 +04 31 22.36 186088 0.9908 174.8 20.2 716 87 2018 02 24 02 10 26 28.057 +04 27 28.92 186553 0.9908 174.8 20.2 776 88 2018 02 24 03 10 29 01.716 +04 23 34.49 186894 0.9909 174.8 20.2 841 88 2018 02 24 04 10 31 34.895 +04 19 38.80 187110 0.9909 174.7 20.2 910 89 2018 02 24 05 10 34 07.800 +04 15 41.59 187201 0.9909 174.5 20.2 984 90 2018 02 24 06 10 36 40.635 +04 11 42.58 187169 0.9909 174.3 20.3 1064 90 2018 02 24 07 10 39 13.602 +04 07 41.47 187012 0.9909 174.0 20.3 1150 90 2018 02 24 08 10 41 46.905 +04 03 37.97 186731 0.9909 173.7 20.3 1243 91 2018 02 24 09 10 44 20.751 +03 59 31.75 186325 0.9909 173.3 20.3 1342 91 2018 02 24 10 10 46 55.350 +03 55 22.50 185794 0.9909 172.9 20.3 1450 92 2018 02 24 11 10 49 30.918 +03 51 09.86 185137 0.9909 172.5 20.3 1566 92 2018 02 24 12 10 52 07.679 +03 46 53.47 184353 0.9909 172.0 20.3 1691 92 2018 02 24 13 10 54 45.864 +03 42 32.92 183442 0.9909 171.5 20.3 1827 93 2018 02 24 14 10 57 25.717 +03 38 07.81 182401 0.9909 171.0 20.3 1974 93 2018 02 24 15 11 00 07.495 +03 33 37.68 181231 0.9909 170.5 20.4 2134 93 2018 02 24 16 11 02 51.471 +03 29 02.05 179929 0.9909 170.0 20.4 2308 94 2018 02 24 17 11 05 37.935 +03 24 20.37 178493 0.9909 169.4 20.4 2497 94 2018 02 24 18 11 08 27.202 +03 19 32.09 176922 0.9909 168.8 20.4 2703 94 2018 02 24 19 11 11 19.608 +03 14 36.56 175214 0.9909 168.2 20.4 2929 94 2018 02 24 20 11 14 15.522 +03 09 33.09 173365 0.9909 167.6 20.4 3177 94 2018 02 24 21 11 17 15.348 +03 04 20.92 171374 0.9909 166.9 20.4 3449 95 2018 02 24 22 11 20 19.529 +02 58 59.19 169238 0.9909 166.2 20.4 3749 95 2018 02 24 23 11 23 28.556 +02 53 26.95 166952 0.9909 165.5 20.4 4081 95 2018 02 25 00 11 26 42.977 +02 47 43.14 164514 0.9909 164.8 20.4 4450 95 2018 02 25 01 11 30 03.406 +02 41 46.56 161919 0.9909 164.1 20.3 4860 95 2018 02 25 02 11 33 30.537 +02 35 35.84 159163 0.9908 163.3 20.3 5320 96 2018 02 25 03 11 37 05.157 +02 29 09.43 156241 0.9908 162.4 20.3 5837 96 2018 02 25 04 11 40 48.167 +02 22 25.56 153147 0.9908 161.6 20.3 6421 96 2018 02 25 05 11 44 40.606 +02 15 22.17 149876 0.9908 160.7 20.3 7084 96 2018 02 25 06 11 48 43.680 +02 07 56.86 146419 0.9908 159.7 20.3 7844 96 2018 02 25 07 11 52 58.804 +02 00 06.83 142770 0.9908 158.8 20.2 8719 96 2018 02 25 08 11 57 27.650 +01 51 48.78 138920 0.9907 157.7 20.2 9737 96 2018 02 25 09 12 02 12.211 +01 42 58.74 134859 0.9907 156.6 20.2 182' 96 2018 02 25 10 12 07 14.899 +01 33 31.96 130577 0.9907 155.4 20.2 206' 97 2018 02 25 11 12 12 38.656 +01 23 22.65 126059 0.9907 154.1 20.1 234' 97 2018 02 25 12 12 18 27.129 +01 12 23.63 121292 0.9906 152.7 20.1 269' 97 2018 02 25 13 12 24 44.903 +01 00 25.98 116260 0.9906 151.2 20.0 311' 97