The following information shows the result of the orbit fit based on Gary Bernstein's method. Most of the information should be self-explanatory. Take special note that while the original Bernstein software works with barycentric coordinates, we convert these results into a heliocentric coordinate system.
# Object: 12EE18 # Created Tue Apr 1 01:09:22 2025 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 78 observations of 78 # Arc: 13.91y # First observation: 2011/04/02 # Last observation: 2025/02/27 # Chi-squared of fit: 76.84 DOF: 150 RMS: 0.18 # Min/Max residuals: -0.53 0.86 # Exact a, adot, b, bdot, g, gdot: 1.923498E-05 3.051009E-02 3.079186E-06 6.389301E-03 2.617794E-02 -3.943705E-03 # Covariance matrix: 1.3407E-13 -3.5584E-14 1.3564E-14 -5.4810E-15 -1.0787E-14 -6.0457E-14 -3.5584E-14 1.2639E-14 -5.7638E-15 2.2889E-15 7.6497E-15 2.5262E-14 1.3564E-14 -5.7638E-15 7.4520E-14 -1.0919E-14 -5.3300E-15 -1.3361E-14 -5.4810E-15 2.2889E-15 -1.0919E-14 2.2621E-15 1.4063E-15 5.3317E-15 -1.0787E-14 7.6497E-15 -5.3300E-15 1.4063E-15 6.1286E-14 1.5771E-14 -6.0457E-14 2.5262E-14 -1.3361E-14 5.3317E-15 1.5771E-14 5.8834E-14 # lat0 lon0 xBary yBary zBary JD0 -11.591776 -159.328251 0.149203 -0.199429 -0.972066 2455653.931716 # Heliocentric elements and errors Epoch: 2455654.5000 = 2011/04/03 Mean Anomaly: 351.32851 +/- 0.001 Argument of Peri: 340.14372 +/- 0.002 Long of Asc Node: 243.50362 +/- 0.000 Inclination: 16.31670 +/- 0.000 Eccentricity: 0.43991280 +/- 0.0000 Semi-Major Axis: 68.03040977 +/- 0.0052 Time of Perihelion: 2460591.2833 +/- 22.9 Perihelion: 38.10296148 +/- 0.0038 Aphelion: 97.95785806 +/- 0.0079 Period (y) 561.1292 +/- 0.06 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -35.98854910 +/- 0.0003 Ecliptic Y -13.42166774 +/- 0.0001 Ecliptic Z -7.67569025 +/- 0.0001 Ecliptic XDOT 0.00137721 +/- 0.0000 Ecliptic YDOT -0.00288428 +/- 0.0000 Ecliptic ZDOT 0.00073751 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 39.16937979 +/- 0.0003 Geocenter to KBO 38.20022972 +/- 0.0004 # Hcoef: 6.28
The following table shows the complete astrometric record for 12EE18. The first three columns show the date of observation. The next six columns are RA and DEC. The next column (when provided) is the observed magnitude and filter. The next column is the object name (12EE18) followed by the observatory code and reference code for the source of the astrometry.
2011 04 02.43095 12 58 04.461 -18 46 43.18 22.2G 12EE18 F51 C~2rXt 2011 04 03.40679 12 57 59.776 -18 46 14.01 21.7i 12EE18 F51 C~1w3q 2011 04 03.41821 12 57 59.706 -18 46 13.84 22.0i 12EE18 F51 C~1w3q 2011 06 08.27965 12 53 54.926 -18 08 35.75 22.3G 12EE18 F51 C~2rXt 2012 03 14.50069 13 06 54.257 -19 14 43.63 21.9i 12EE18 F51 C~1w3q 2012 03 14.51258 13 06 54.188 -19 14 43.23 21.7i 12EE18 F51 C~1w3q 2012 04 24.35374 13 03 42.084 -18 54 50.37 22.2w 12EE18 F51 C~1w3q 2012 04 24.36851 13 03 42.014 -18 54 50.06 22.5w 12EE18 F51 C~1w3q 2012 04 24.38324 13 03 41.957 -18 54 49.50 22.0w 12EE18 F51 C~1w3q 2012 04 24.39805 13 03 41.902 -18 54 49.00 22.1w 12EE18 F51 C~1w3q 2013 05 04.35105 13 10 28.596 -19 08 49.97 22.1w 12EE18 F51 C~1w3q 2013 05 04.36738 13 10 28.512 -19 08 49.42 22.0w 12EE18 F51 C~1w3q 2013 05 04.38372 13 10 28.443 -19 08 48.62 22.1w 12EE18 F51 C~1w3q 2013 05 04.40007 13 10 28.428 -19 08 47.94 22.0w 12EE18 F51 C~1w3q 2014 01 18.62683 13 23 51.384 -19 52 45.17 21.7i 12EE18 F51 C~1w3q 2014 04 10.39494 13 19 58.082 -19 41 14.57 21.4i 12EE18 F51 C~1w3q 2014 04 10.41879 13 19 57.952 -19 41 13.99 21.3i 12EE18 F51 C~1w3q 2014 04 10.43070 13 19 57.902 -19 41 13.56 21.7i 12EE18 F51 C~1w3q 2014 04 30.35989 13 18 22.326 -19 30 10.83 21.8G 12EE18 F51 C~2rXt 2014 04 30.37069 13 18 22.278 -19 30 10.30 22.1G 12EE18 F51 C~2rXt 2014 04 30.38150 13 18 22.229 -19 30 09.90 21.8G 12EE18 F51 C~2rXt 2014 04 30.39229 13 18 22.161 -19 30 09.34 21.9G 12EE18 F51 C~2rXt 2015 01 31.61810 13 31 25.044 -20 12 14.69 22.3G 12EE18 F51 C~2rXt 2015 01 31.62912 13 31 25.033 -20 12 15.11 22.0G 12EE18 F51 C~2rXt 2015 01 31.64011 13 31 25.030 -20 12 15.19 22.7G 12EE18 F51 C~2rXt 2015 01 31.65113 13 31 25.032 -20 12 15.18 22.5G 12EE18 F51 C~2rXt 2015 02 01.59695 13 31 24.537 -20 12 24.30 22.1G 12EE18 F51 C~2rXt 2015 06 16.33023 13 23 25.502 -19 22 05.82 22.0G 12EE18 F51 C~2rXt 2016 02 03.62042 13 39 01.927 -20 28 14.28 22.1G 12EE18 F51 C~2rXt 2016 03 05.50398 13 37 59.034 -20 27 35.17 22.6G 12EE18 F51 C~2rXt 2016 03 05.51561 13 37 58.954 -20 27 35.15 22.5G 12EE18 F51 C~2rXt 2016 03 05.52725 13 37 58.916 -20 27 35.04 21.8G 12EE18 F51 C~2rXt 2016 03 05.53887 13 37 58.880 -20 27 34.89 22.3G 12EE18 F51 C~2rXt 2016 03 06.48574 13 37 55.650 -20 27 24.09 22.0G 12EE18 F51 C~2rXt 2016 03 06.49670 13 37 55.615 -20 27 23.88 22.2G 12EE18 F51 C~2rXt 2016 03 06.50772 13 37 55.576 -20 27 23.93 22.3G 12EE18 F51 C~2rXt 2016 04 09.43558 13 35 27.837 -20 15 30.81 22.1G 12EE18 F51 C~2rXt 2016 04 09.44586 13 35 27.796 -20 15 30.48 22.2G 12EE18 F51 C~2rXt 2016 04 09.45615 13 35 27.747 -20 15 30.13 22.1G 12EE18 F51 C~2rXt 2016 04 09.46644 13 35 27.694 -20 15 29.95 22.4G 12EE18 F51 C~2rXt 2016 05 02.35489 13 33 36.130 -20 03 15.90 23.4G 12EE18 F51 C~2rXt 2016 05 02.36649 13 33 36.037 -20 03 15.52 22.4G 12EE18 F51 C~2rXt 2016 05 02.37812 13 33 35.995 -20 03 14.86 22.0G 12EE18 F51 C~2rXt 2016 05 02.38974 13 33 35.947 -20 03 14.45 22.4G 12EE18 F51 C~2rXt 2016 06 08.29520 13 31 19.022 -19 42 32.08 22.3G 12EE18 F51 C~2rXt 2016 06 08.30551 13 31 19.016 -19 42 31.79 22.3G 12EE18 F51 C~2rXt 2016 06 08.31579 13 31 18.973 -19 42 31.49 22.3G 12EE18 F51 C~2rXt 2016 06 08.32609 13 31 18.957 -19 42 31.18 22.3G 12EE18 F51 C~2rXt 2017 02 03.62432 13 46 43.842 -20 42 47.17 21.5G 12EE18 F51 C~2rXt 2017 02 21.57185 13 46 20.051 -20 43 41.77 20.3G 12EE18 F51 C~2rXt 2017 03 04.58336 13 45 50.499 -20 42 33.96 22.3G 12EE18 F51 C~2rXt 2017 03 04.60704 13 45 50.426 -20 42 33.84 22.5G 12EE18 F51 C~2rXt 2017 03 04.61800 13 45 50.382 -20 42 33.50 23.7G 12EE18 F51 C~2rXt 2017 03 04.62895 13 45 50.338 -20 42 33.27 22.6G 12EE18 F51 C~2rXt 2017 03 18.51498 13 44 59.770 -20 39 22.93 20.2G 12EE18 F51 C~2rXt 2017 03 19.49499 13 44 55.696 -20 39 05.79 22.8G 12EE18 F51 C~2rXt 2017 03 27.50879 13 44 20.792 -20 36 22.64 22.0G 12EE18 F51 C~2rXt 2017 03 27.51877 13 44 20.713 -20 36 22.41 22.3G 12EE18 F51 C~2rXt 2017 03 27.52879 13 44 20.684 -20 36 22.22 21.8G 12EE18 F51 C~2rXt 2017 03 27.53878 13 44 20.637 -20 36 22.01 21.7G 12EE18 F51 C~2rXt 2017 05 19.36670 13 40 11.064 -20 09 18.72 22.0G 12EE18 F51 C~2rXt 2020 04 21.40665 14 06 09.140 -21 03 40.42 22.0w 12EE18 F51 C~3qIg 2020 04 21.41772 14 06 09.093 -21 03 39.99 21.8w 12EE18 F51 C~3qIg 2020 04 21.42880 14 06 09.067 -21 03 39.46 22.0w 12EE18 F51 C~3qIg 2020 04 21.43986 14 06 08.977 -21 03 39.35 21.9w 12EE18 F51 C~3qIg 2020 04 22.42478 14 06 04.027 -21 03 10.26 21.9w 12EE18 F51 C~3qIg 2020 04 22.45964 14 06 03.835 -21 03 09.41 22.0w 12EE18 F51 C~3qIg 2020 05 15.31092 14 04 11.760 -20 51 09.28 21.8w 12EE18 F51 C~3srC 2020 05 15.32250 14 04 11.707 -20 51 09.03 21.8w 12EE18 F51 C~3srC 2020 05 15.33408 14 04 11.658 -20 51 08.53 22.0w 12EE18 F51 C~3srC 2020 05 15.34582 14 04 11.602 -20 51 08.19 21.9w 12EE18 F51 C~3srC 2020 06 23.29018 14 01 58.892 -20 31 28.17 22.0w 12EE18 F51 C~3xqP 2020 06 23.30140 14 01 58.860 -20 31 28.14 22.1w 12EE18 F51 C~3xqP 2020 06 23.31263 14 01 58.850 -20 31 27.70 22.1w 12EE18 F51 C~3xqP 2020 06 23.32385 14 01 58.833 -20 31 27.39 22.2w 12EE18 F51 C~3xqP 2025 02 27.584340 14 49 34.416 -21 52 45.66 22.1w 12EE18 F52 C~8iVQ 2025 02 27.595907 14 49 34.418 -21 52 45.58 22.2w 12EE18 F52 C~8iVQ 2025 02 27.619078 14 49 34.370 -21 52 45.65 22.0w 12EE18 F52 C~8iVQ
The following table shows the residuals to the orbit fit. The first coumn is the point number. The second column is the time, in years, measured from the first observation. The third and fifth columns are the regularized positions used in the orbit fit. The fourth and sixth columns are the residuals, in arc seconds, for RA and Dec respectively.
1 0.0000 0.00 -0.09 0.00 0.21
2 0.0027 0.00 0.05 0.00 0.13
3 0.0027 0.00 -0.16 0.00 -0.04
4 0.1830 0.00 -0.24 0.00 -0.03
5 0.9502 0.00 0.13 0.00 -0.13
6 0.9503 0.00 -0.12 0.00 0.03
7 1.0621 0.00 -0.14 0.00 0.10
8 1.0621 0.00 -0.16 0.00 -0.11
9 1.0622 0.00 0.02 0.00 -0.07
10 1.0622 0.00 0.23 0.00 -0.10
11 2.0888 0.00 0.15 0.00 -0.05
12 2.0888 0.00 -0.03 0.00 -0.09
13 2.0889 0.00 0.01 0.00 0.12
14 2.0889 0.00 0.86 0.00 0.21
15 2.7986 0.00 0.11 0.00 0.14
16 3.0225 0.00 0.26 0.00 0.20
17 3.0226 0.00 0.09 0.00 0.05
18 3.0226 0.00 0.24 0.00 0.12
19 3.0771 0.00 -0.13 0.00 -0.23
20 3.0772 0.00 -0.10 0.00 -0.08
21 3.0772 0.00 -0.07 0.00 -0.06
22 3.0772 0.00 -0.34 0.00 0.12
23 3.8335 0.00 -0.03 0.00 0.12
24 3.8335 0.00 -0.10 0.00 -0.19
25 3.8336 0.00 -0.05 0.00 -0.16
26 3.8336 0.00 0.07 0.00 -0.04
27 3.8362 0.00 -0.06 0.00 -0.08
28 4.2051 0.00 -0.06 0.00 -0.16
29 4.8410 0.00 0.31 0.00 0.01
30 4.9256 0.00 0.49 0.00 0.07
31 4.9256 0.00 -0.11 0.00 -0.04
32 4.9257 0.00 -0.07 0.00 -0.06
33 4.9257 0.00 -0.01 0.00 -0.04
34 4.9283 0.00 -0.08 0.00 -0.08
35 4.9283 0.00 -0.02 0.00 0.01
36 4.9283 0.00 -0.02 0.00 -0.17
37 5.0212 0.00 -0.18 0.00 -0.06
38 5.0213 0.00 -0.02 0.00 -0.03
39 5.0213 0.00 0.02 0.00 0.03
40 5.0213 0.00 -0.00 0.00 -0.09
41 5.0840 0.00 0.34 0.00 -0.15
42 5.0840 0.00 -0.23 0.00 -0.16
43 5.0840 0.00 -0.02 0.00 0.10
44 5.0841 0.00 0.09 0.00 0.11
45 5.1851 0.00 -0.25 0.00 -0.09
46 5.1851 0.00 0.05 0.00 -0.12
47 5.1852 0.00 -0.21 0.00 -0.13
48 5.1852 0.00 -0.06 0.00 -0.14
49 5.8431 0.00 0.01 0.00 -0.00
50 5.8922 0.00 -0.53 0.00 0.11
51 5.9224 0.00 -0.02 0.00 0.23
52 5.9225 0.00 0.03 0.00 0.12
53 5.9225 0.00 -0.09 0.00 0.35
54 5.9225 0.00 -0.22 0.00 0.48
55 5.9605 0.00 0.66 0.00 0.18
56 5.9632 0.00 0.12 0.00 -0.28
57 5.9852 0.00 0.05 0.00 0.01
58 5.9852 0.00 -0.44 0.00 0.01
59 5.9852 0.00 -0.17 0.00 -0.02
60 5.9852 0.00 -0.19 0.00 -0.04
61 6.1299 0.00 0.03 0.00 0.02
62 9.0540 0.00 -0.25 0.00 -0.16
63 9.0540 0.00 -0.10 0.00 -0.05
64 9.0541 0.00 0.37 0.00 0.15
65 9.0541 0.00 -0.13 0.00 -0.06
66 9.0568 0.00 0.21 0.00 0.13
67 9.0569 0.00 0.02 0.00 -0.05
68 9.1195 0.00 0.00 0.00 0.09
69 9.1195 0.00 0.02 0.00 -0.03
70 9.1195 0.00 0.10 0.00 0.09
71 9.1195 0.00 0.09 0.00 0.05
72 9.2262 0.00 -0.07 0.00 0.04
73 9.2262 0.00 -0.21 0.00 -0.22
74 9.2262 0.00 -0.03 0.00 -0.07
75 9.2263 0.00 0.05 0.00 -0.04
76 13.9087 0.00 -0.07 0.00 0.03
77 13.9087 0.00 0.20 0.00 0.08
78 13.9088 0.00 -0.05 0.00 -0.03
The following table comes from a 10My integration of the orbit of the object. Three columns are shown. The first column is the result of integrating the nominal orbit. The other two columns are based on clones of the nominal orbit that are +/- 3 sigma from the nominal orbit. If all three types agree then the classificiation is deemed secure. The basis for these calculations is described in more detail in AJ, 129, 1117 (2005). Any use made of these calculations should refer to and credit this publication and the Deep Ecliptic Survey Team.
12EE18 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 67.799 67.799 67.799 ecceobj 0.438 0.438 0.438 incobj 16.323 16.323 16.323 qmin 36.913 36.920 36.864 qmax 101.837 101.832 101.867 amean 68.476 68.536 68.500 amin 67.567 67.615 67.601 amax 69.710 69.742 69.693 emean 0.445 0.446 0.446 emin 0.430 0.432 0.432 emax 0.461 0.460 0.462 imean 17.175 17.168 17.102 imin 16.480 16.504 16.420 imax 17.949 17.888 17.856 excite_mean 0.535 0.535 0.535 fracstop 1.000 1.000 1.000 cjmean 3.019 3.019 3.019 libcent 0 -180.0 -180.0 -180.0 libamp 0 -180.0 -180.0 -180.0 libcent 1 -180.0 -180.0 -180.0 libamp 1 -180.0 -180.0 -180.0 libcent 2 -180.0 -180.0 -180.0 libamp 2 -180.0 -180.0 -180.0 libcent 3 -180.0 -180.0 -180.0 libamp 3 -180.0 -180.0 -180.0 libcent 4 -180.0 -180.0 -180.0 libamp 4 -180.0 -180.0 -180.0 kozaimean 160.5 161.0 160.4 kozaiamp 180.0 180.0 180.0