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: 21TH165 # Created Sun Dec 22 02:11:19 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 108 observations of 108 # Arc: 8.95y # First observation: 2015/10/18 # Last observation: 2024/09/28 # Chi-squared of fit: 53.19 DOF: 210 RMS: 0.12 # Min/Max residuals: -0.38 0.39 # Exact a, adot, b, bdot, g, gdot: -2.581637E-05 -7.902890E-02 1.791832E-06 5.484940E-03 4.845690E-02 5.600936E-05 # Covariance matrix: 5.8874E-13 -1.8331E-13 -3.0222E-14 1.1122E-14 2.5420E-14 1.6213E-13 -1.8331E-13 6.3383E-14 1.0972E-14 -4.1666E-15 -1.4225E-14 -5.9934E-14 -3.0222E-14 1.0972E-14 1.5505E-13 -2.3285E-14 1.7234E-17 -1.1195E-14 1.1122E-14 -4.1666E-15 -2.3285E-14 3.8928E-15 1.2967E-15 4.1545E-15 2.5420E-14 -1.4225E-14 1.7234E-17 1.2967E-15 5.0677E-14 1.0755E-14 1.6213E-13 -5.9934E-14 -1.1195E-14 4.1545E-15 1.0755E-14 6.0345E-14 # lat0 lon0 xBary yBary zBary JD0 25.950928 25.941366 0.028350 0.437641 -0.898887 2457313.781529 # Heliocentric elements and errors Epoch: 2457314.5000 = 2015/10/19 Mean Anomaly: 359.98740 +/- 0.000 Argument of Peri: 81.55464 +/- 0.001 Long of Asc Node: 106.49707 +/- 0.000 Inclination: 154.91497 +/- 0.000 Eccentricity: 0.46159301 +/- 0.0000 Semi-Major Axis: 40.00129581 +/- 0.0016 Time of Perihelion: 2457317.7336 +/- 5.7 Perihelion: 21.53697716 +/- 0.0012 Aphelion: 58.46561446 +/- 0.0025 Period (y) 252.9993 +/- 0.02 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 17.59439629 +/- 0.0001 Ecliptic Y 8.52783947 +/- 0.0000 Ecliptic Z 9.03076175 +/- 0.0000 Ecliptic XDOT 0.00183233 +/- 0.0000 Ecliptic YDOT -0.00407995 +/- 0.0000 Ecliptic ZDOT 0.00028009 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 21.53697960 +/- 0.0001 Geocenter to KBO 20.63692743 +/- 0.0001 # Hcoef: 8.42
The following table shows the complete astrometric record for 21TH165. 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 (21TH165) followed by the observatory code and reference code for the source of the astrometry.
2015 10 18.280740 00 52 02.32 +33 54 51.9 22.0G 21TH165 568 C~5nMl 2017 10 25.125203 00 11 15.66 +29 58 43.6 21.3z 21TH165 W84 C~5nMl 2018 08 11.287229 00 10 28.39 +29 19 02.5 22.5g 21TH165 W84 C~5nMl 2018 09 01.259310 00 06 02.27 +29 10 08.6 21.5z 21TH165 W84 C~5nMl 2018 09 03.228078 00 05 34.86 +29 08 38.3 22.5g 21TH165 W84 C~5nMl 2018 09 04.243506 00 05 20.59 +29 07 49.2 22.2g 21TH165 W84 C~5nMl 2018 09 04.245435 00 05 20.57 +29 07 49.3 21.7r 21TH165 W84 C~5nMl 2018 09 06.248402 00 04 52.20 +29 06 07.1 21.6r 21TH165 W84 C~5nMl 2018 09 10.179089 00 03 55.77 +29 02 26.0 22.0g 21TH165 W84 C~5nMl 2018 09 11.194629 00 03 41.05 +29 01 24.7 21.7r 21TH165 W84 C~5nMl 2018 09 22.136179 00 01 00.17 +28 48 33.8 21.6z 21TH165 W84 C~5nMl 2018 10 13.096951 23 55 55.58 +28 15 46.9 21.3z 21TH165 W84 C~5nMl 2019 10 28.220709 23 35 33.869 +25 35 22.09 21.5G 21TH165 F51 C~5lmc 2019 10 28.232907 23 35 33.723 +25 35 20.72 21.9G 21TH165 F51 C~5lmc 2020 08 18.377231 23 34 34.063 +25 01 40.31 21.9G 21TH165 F51 C~5lmc 2020 08 18.389774 23 34 33.903 +25 01 39.71 22.1G 21TH165 F51 C~5lmc 2020 08 18.402315 23 34 33.748 +25 01 39.38 21.9G 21TH165 F51 C~5lmc 2020 08 18.414943 23 34 33.582 +25 01 38.86 21.8G 21TH165 F51 C~5lmc 2020 08 19.409406 23 34 20.991 +25 00 59.46 22.3G 21TH165 F52 C~5lmc 2020 08 19.421513 23 34 20.833 +25 00 58.91 21.9G 21TH165 F52 C~5lmc 2020 08 19.433647 23 34 20.660 +25 00 58.65 21.6G 21TH165 F52 C~5lmc 2020 08 19.445856 23 34 20.513 +25 00 58.02 21.9G 21TH165 F52 C~5lmc 2020 09 12.317487 23 28 58.311 +24 36 57.25 21.5G 21TH165 F52 C~5lmc 2020 09 12.329587 23 28 58.154 +24 36 56.43 21.7G 21TH165 F52 C~5lmc 2020 09 12.341700 23 28 57.967 +24 36 55.29 21.7G 21TH165 F52 C~5lmc 2020 10 11.434748 23 22 26.773 +23 49 37.58 22.0G 21TH165 F51 C~5lmc 2020 10 11.446759 23 22 26.640 +23 49 36.41 21.9G 21TH165 F51 C~5lmc 2020 10 11.458836 23 22 26.458 +23 49 34.89 21.8G 21TH165 F51 C~5lmc 2020 10 11.470910 23 22 26.340 +23 49 33.54 21.7G 21TH165 F51 C~5lmc 2020 10 17.240420 23 21 16.481 +23 38 35.74 21.8G 21TH165 F51 C~5lmc 2020 10 17.251527 23 21 16.341 +23 38 34.50 22.4G 21TH165 F51 C~5lmc 2020 10 17.262630 23 21 16.221 +23 38 33.10 22.3G 21TH165 F51 C~5lmc 2020 10 17.273687 23 21 16.090 +23 38 31.92 22.4G 21TH165 F51 C~5lmc 2020 12 09.271882 23 14 42.442 +21 58 08.77 21.7G 21TH165 F52 C~5lmc 2021 08 14.572787 23 19 27.929 +22 49 06.55 21.7G 21TH165 F51 C~5lmc 2021 08 14.585774 23 19 27.770 +22 49 05.77 21.7G 21TH165 F51 C~5lmc 2021 08 14.598813 23 19 27.612 +22 49 05.53 21.9G 21TH165 F51 C~5lmc 2021 08 14.611822 23 19 27.455 +22 49 05.22 21.5G 21TH165 F51 C~5lmc 2021 09 11.342484 23 13 23.829 +22 20 24.40 21.9G 21TH165 F51 C~5lmc 2021 09 11.355804 23 13 23.649 +22 20 23.23 21.6G 21TH165 F51 C~5lmc 2021 09 11.366997 23 13 23.493 +22 20 22.46 22.3G 21TH165 F51 C~5lmc 2021 09 11.378297 23 13 23.344 +22 20 21.65 21.5G 21TH165 F51 C~5lmc 2021 09 28.282159 23 09 38.957 +21 54 02.99 21.7G 21TH165 F52 C~5lmc 2021 09 28.293800 23 09 38.803 +21 54 01.90 21.7G 21TH165 F52 C~5lmc 2021 09 28.305352 23 09 38.627 +21 54 00.61 21.2G 21TH165 F52 C~5lmc 2021 09 28.316904 23 09 38.492 +21 53 59.65 21.3G 21TH165 F52 C~5lmc 2021 10 04.230818 23 08 23.745 +21 43 36.06 21.7G 21TH165 F51 C~5lmc 2021 10 04.243917 23 08 23.577 +21 43 34.65 21.6G 21TH165 F51 C~5lmc 2021 10 04.256976 23 08 23.423 +21 43 33.42 21.5G 21TH165 F51 C~5lmc 2021 10 04.270006 23 08 23.254 +21 43 31.91 21.6G 21TH165 F51 C~5lmc 2021 10 06.495730 23 07 55.870 +21 39 29.61 22.1G 21TH165 F51 C~5lmc 2021 10 06.507923 23 07 55.728 +21 39 28.35 22.1G 21TH165 F51 C~5lmc 2021 10 06.520064 23 07 55.567 +21 39 27.07 22.1G 21TH165 F51 C~5lmc 2021 10 06.532172 23 07 55.426 +21 39 25.63 22.0G 21TH165 F51 C~5lmc 2021 10 11.449935 23 06 56.797 +21 30 18.46 22.2w 21TH165 F51 C~5lmc 2021 10 11.461999 23 06 56.664 +21 30 17.14 21.8w 21TH165 F51 C~5lmc 2021 10 11.474175 23 06 56.519 +21 30 15.68 22.1w 21TH165 F51 C~5lmc 2021 10 26.22823 23 04 18.626 +21 01 50.01 22.0w 21TH165 F52 C~5lmc 2021 10 26.25260 23 04 18.382 +21 01 47.14 22.3w 21TH165 F52 C~5lmc 2021 10 26.26487 23 04 18.271 +21 01 45.44 22.2w 21TH165 F52 C~5lmc 2021 11 01.210244 23 03 23.613 +20 50 07.73 21.8G 21TH165 F51 C~5lmc 2021 11 01.223423 23 03 23.505 +20 50 06.25 22.4G 21TH165 F51 C~5lmc 2021 11 28.273850 23 00 33.599 +19 59 53.19 22.2G 21TH165 F51 C~5lmc 2021 11 28.287244 23 00 33.535 +19 59 51.96 22.5G 21TH165 F51 C~5lmc 2021 11 28.300671 23 00 33.495 +19 59 50.54 22.2G 21TH165 F51 C~5lmc 2021 11 28.314114 23 00 33.444 +19 59 49.21 21.9G 21TH165 F51 C~5lmc 2022 07 31.469662 23 07 04.931 +20 39 35.16 22.0G 21TH165 F52 C~5lmc 2022 07 31.482418 23 07 04.813 +20 39 34.70 22.2G 21TH165 F52 C~5lmc 2022 08 26.403075 23 01 52.836 +20 20 22.47 22.1G 21TH165 F52 C~5lmc 2022 08 26.414740 23 01 52.680 +20 20 21.85 22.0G 21TH165 F52 C~5lmc 2022 08 26.426445 23 01 52.530 +20 20 21.09 22.1G 21TH165 F52 C~5lmc 2022 08 26.438178 23 01 52.379 +20 20 20.30 22.1G 21TH165 F52 C~5lmc 2022 08 31.347188 23 00 48.563 +20 14 44.73 22.1w 21TH165 F51 C~5lmc 2022 08 31.361257 23 00 48.378 +20 14 43.67 22.0w 21TH165 F51 C~5lmc 2022 08 31.392296 23 00 47.966 +20 14 41.46 22.4w 21TH165 F51 C~5lmc 2022 09 01.260411 23 00 36.59 +20 13 38.4 21.8V 21TH165 H21 C~5lmc 2022 09 01.275105 23 00 36.39 +20 13 37.5 21.8V 21TH165 H21 C~5lmc 2022 09 01.278778 23 00 36.36 +20 13 37.2 21.8V 21TH165 H21 C~5lmc 2023 07 26.432338 22 53 36.712 +18 23 49.96 22.2w 21TH165 F52 C~6wso 2023 07 26.444502 22 53 36.569 +18 23 49.57 22.2w 21TH165 F52 C~6wso 2023 07 26.456663 22 53 36.472 +18 23 49.29 22.0w 21TH165 F52 C~6wso 2023 09 07.305833 22 45 01.500 +17 44 45.72 22.0w 21TH165 F52 C~79NU 2023 09 07.318527 22 45 01.339 +17 44 44.58 21.9w 21TH165 F52 C~79NU 2023 09 07.331247 22 45 01.173 +17 44 43.51 21.8w 21TH165 F52 C~79NU 2023 09 07.344001 22 45 01.019 +17 44 42.33 22.0w 21TH165 F52 C~79NU 2023 09 18.305377 22 42 43.226 +17 28 12.15 22.0w 21TH165 F51 C~7Bmf 2023 09 18.317690 22 42 43.102 +17 28 10.60 22.3w 21TH165 F51 C~7Bmf 2023 09 18.330020 22 42 42.951 +17 28 09.92 22.1w 21TH165 F51 C~7Bmf 2023 09 18.342598 22 42 42.788 +17 28 08.46 22.1w 21TH165 F51 C~7Bmf 2023 10 05.232303 22 39 25.141 +16 59 18.07 21.8w 21TH165 F51 C~7Bmf 2023 10 05.245411 22 39 24.990 +16 59 16.32 22.1w 21TH165 F51 C~7Bmf 2023 10 05.271659 22 39 24.706 +16 59 13.47 22.0w 21TH165 F51 C~7Bmf 2023 10 16.236008 22 37 32.096 +16 39 12.27 22.2w 21TH165 F51 C~7Bmf 2023 10 16.248405 22 37 31.977 +16 39 10.63 21.7w 21TH165 F51 C~7Bmf 2023 10 16.261733 22 37 31.845 +16 39 09.46 21.9w 21TH165 F51 C~7Bmf 2024 08 05.422913 22 37 55.176 +15 58 57.82 21.9w 21TH165 F52 C~8AkJ 2024 08 05.436095 22 37 55.035 +15 58 57.19 22.0w 21TH165 F52 C~8AkJ 2024 08 05.449398 22 37 54.867 +15 58 56.62 21.9w 21TH165 F52 C~8AkJ 2024 09 01.322512 22 32 28.767 +15 30 34.56 21.9w 21TH165 F51 C~8Drq 2024 09 01.334608 22 32 28.628 +15 30 33.65 22.3w 21TH165 F51 C~8Drq 2024 09 01.346668 22 32 28.478 +15 30 32.75 21.9w 21TH165 F51 C~8Drq 2024 09 01.358713 22 32 28.317 +15 30 31.86 22.1w 21TH165 F51 C~8Drq 2024 09 05.310881 22 31 39.358 +15 25 04.65 22.0w 21TH165 F52 C~8Drq 2024 09 05.324079 22 31 39.201 +15 25 03.45 22.0w 21TH165 F52 C~8Drq 2024 09 05.350475 22 31 38.864 +15 25 01.10 21.9w 21TH165 F52 C~8Drq 2024 09 28.248601 22 27 09.193 +14 48 44.21 22.0w 21TH165 F52 C~8Hcp 2024 09 28.259152 22 27 09.091 +14 48 43.06 21.8w 21TH165 F52 C~8Hcq 2024 09 28.269719 22 27 08.991 +14 48 41.76 21.8w 21TH165 F52 C~8Hcq
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 0.01 0.00 0.00
2 2.0201 0.00 0.12 0.00 -0.15
3 2.8145 0.00 -0.13 0.00 0.05
4 2.8719 0.00 -0.01 0.00 0.09
5 2.8773 0.00 0.00 0.00 -0.18
6 2.8801 0.00 -0.05 0.00 -0.17
7 2.8801 0.00 0.07 0.00 0.02
8 2.8856 0.00 -0.00 0.00 0.03
9 2.8964 0.00 -0.04 0.00 -0.06
10 2.8991 0.00 0.06 0.00 0.09
11 2.9291 0.00 -0.01 0.00 0.20
12 2.9865 0.00 0.15 0.00 -0.01
13 4.0272 0.00 -0.06 0.00 -0.02
14 4.0272 0.00 -0.15 0.00 0.07
15 4.8353 0.00 -0.05 0.00 -0.03
16 4.8353 0.00 -0.05 0.00 -0.15
17 4.8354 0.00 0.03 0.00 -0.00
18 4.8354 0.00 -0.04 0.00 -0.04
19 4.8381 0.00 0.22 0.00 -0.03
20 4.8382 0.00 0.19 0.00 -0.09
21 4.8382 0.00 -0.06 0.00 0.13
22 4.8382 0.00 0.09 0.00 -0.01
23 4.9036 0.00 -0.02 0.00 0.07
24 4.9036 0.00 0.18 0.00 0.21
25 4.9037 0.00 -0.07 0.00 0.02
26 4.9833 0.00 -0.10 0.00 -0.21
27 4.9833 0.00 0.17 0.00 -0.03
28 4.9834 0.00 -0.28 0.00 -0.19
29 4.9834 0.00 0.23 0.00 -0.17
30 4.9992 0.00 -0.05 0.00 0.01
31 4.9992 0.00 -0.17 0.00 0.05
32 4.9993 0.00 0.02 0.00 -0.07
33 4.9993 0.00 0.03 0.00 0.02
34 5.1444 0.00 0.01 0.00 -0.10
35 5.8242 0.00 -0.07 0.00 0.01
36 5.8242 0.00 -0.03 0.00 -0.25
37 5.8243 0.00 0.03 0.00 0.04
38 5.8243 0.00 0.09 0.00 0.25
39 5.9002 0.00 -0.02 0.00 -0.09
40 5.9003 0.00 0.01 0.00 -0.16
41 5.9003 0.00 -0.04 0.00 -0.00
42 5.9003 0.00 0.04 0.00 0.12
43 5.9466 0.00 0.08 0.00 -0.07
44 5.9466 0.00 0.04 0.00 0.03
45 5.9467 0.00 -0.35 0.00 -0.08
46 5.9467 0.00 -0.11 0.00 0.14
47 5.9629 0.00 -0.06 0.00 -0.06
48 5.9629 0.00 -0.12 0.00 -0.07
49 5.9630 0.00 0.02 0.00 0.11
50 5.9630 0.00 -0.06 0.00 -0.01
51 5.9691 0.00 0.01 0.00 -0.11
52 5.9691 0.00 0.13 0.00 -0.02
53 5.9692 0.00 -0.05 0.00 0.04
54 5.9692 0.00 0.06 0.00 -0.06
55 5.9827 0.00 0.02 0.00 -0.01
56 5.9827 0.00 0.16 0.00 0.04
57 5.9827 0.00 0.13 0.00 -0.04
58 6.0231 0.00 0.07 0.00 0.30
59 6.0232 0.00 -0.00 0.00 0.29
60 6.0232 0.00 0.14 0.00 0.02
61 6.0395 0.00 -0.21 0.00 -0.07
62 6.0395 0.00 -0.08 0.00 -0.01
63 6.1136 0.00 0.04 0.00 -0.06
64 6.1136 0.00 -0.14 0.00 0.08
65 6.1137 0.00 0.05 0.00 0.03
66 6.1137 0.00 0.06 0.00 0.08
67 6.7849 0.00 -0.30 0.00 0.13
68 6.7849 0.00 0.03 0.00 -0.03
69 6.8559 0.00 -0.00 0.00 -0.03
70 6.8559 0.00 -0.06 0.00 0.10
71 6.8560 0.00 -0.01 0.00 0.10
72 6.8560 0.00 0.03 0.00 0.06
73 6.8694 0.00 -0.06 0.00 0.07
74 6.8695 0.00 -0.05 0.00 0.01
75 6.8696 0.00 -0.08 0.00 0.03
76 6.8719 0.00 -0.29 0.00 0.12
77 6.8720 0.00 -0.38 0.00 0.29
78 6.8720 0.00 -0.10 0.00 0.26
79 7.7704 0.00 0.06 0.00 0.10
80 7.7705 0.00 -0.17 0.00 -0.03
81 7.7705 0.00 0.28 0.00 -0.04
82 7.8878 0.00 -0.01 0.00 0.06
83 7.8879 0.00 0.02 0.00 -0.01
84 7.8879 0.00 -0.01 0.00 -0.01
85 7.8879 0.00 0.14 0.00 -0.12
86 7.9179 0.00 -0.37 0.00 0.07
87 7.9180 0.00 0.08 0.00 -0.30
88 7.9180 0.00 0.12 0.00 0.20
89 7.9180 0.00 0.03 0.00 -0.06
90 7.9643 0.00 0.11 0.00 0.05
91 7.9643 0.00 0.02 0.00 -0.30
92 7.9644 0.00 0.12 0.00 -0.33
93 7.9944 0.00 -0.09 0.00 0.07
94 7.9944 0.00 -0.07 0.00 -0.20
95 7.9945 0.00 -0.11 0.00 0.11
96 8.7998 0.00 -0.06 0.00 0.07
97 8.7999 0.00 0.12 0.00 0.03
98 8.7999 0.00 -0.08 0.00 0.05
99 8.8735 0.00 -0.11 0.00 -0.11
100 8.8735 0.00 0.08 0.00 -0.05
101 8.8736 0.00 0.11 0.00 0.02
102 8.8736 0.00 -0.04 0.00 0.09
103 8.8844 0.00 -0.07 0.00 0.05
104 8.8844 0.00 0.05 0.00 -0.04
105 8.8845 0.00 -0.06 0.00 -0.15
106 8.9472 0.00 -0.08 0.00 0.01
107 8.9472 0.00 0.14 0.00 -0.05
108 8.9473 0.00 0.39 0.00 -0.27
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.
21TH165 quality flag:3 Type: CENTAURR CENTAURR CENTAURR axisobj 39.439 39.439 39.439 ecceobj 0.453 0.453 0.453 incobj 154.907 154.907 154.907 qmin 21.560 21.560 21.560 qmax 57.318 57.317 57.319 amean 39.439 39.439 39.439 amin 39.439 39.439 39.439 amax 39.439 39.439 39.439 emean 0.453 0.453 0.453 emin 0.453 0.453 0.453 emax 0.453 0.453 0.453 imean 153.328 153.328 153.328 imin 153.328 153.328 153.328 imax 153.328 153.328 153.328 excite_mean 0.638 0.638 0.638 fracstop 0.000 0.000 0.000 cjmean -1.060 -1.060 -1.060 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 81.4 81.4 81.4 kozaiamp 0.0 0.0 0.0