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: 181871 # Created Sun Dec 22 02:06:59 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 30 observations of 30 # Arc: 21.91y # First observation: 1999/02/12 # Last observation: 2021/01/11 # Chi-squared of fit: 89.31 DOF: 54 RMS: 0.31 # Min/Max residuals: -0.56 1.08 # Exact a, adot, b, bdot, g, gdot: 1.730750E-05 2.534417E-02 2.151737E-06 -3.269023E-04 2.502281E-02 1.202606E-03 # Covariance matrix: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 # lat0 lon0 xBary yBary zBary JD0 -0.335899 121.668052 -0.367669 -0.005632 -0.923194 2451221.761613 # Heliocentric elements and errors Epoch: 2451222.5000 = 1999/02/13 Mean Anomaly: 39.93646 +/- 0.000 Argument of Peri: 157.17972 +/- 0.000 Long of Asc Node: 278.15955 +/- 0.000 Inclination: 0.80645 +/- 0.000 Eccentricity: 0.08632376 +/- 0.0000 Semi-Major Axis: 43.62340827 +/- 0.0000 Time of Perihelion: 2439547.8235 +/- 0.0 Perihelion: 39.85767172 +/- 0.0000 Aphelion: 47.38914483 +/- 0.0000 Period (y) 288.1294 +/- 0.00 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -21.77029611 +/- 0.0000 Ecliptic Y 34.60499280 +/- 0.0000 Ecliptic Z -0.23420352 +/- 0.0000 Ecliptic XDOT -0.00243080 +/- 0.0000 Ecliptic YDOT -0.00133501 +/- 0.0000 Ecliptic ZDOT -0.00003654 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 40.88401980 +/- 0.0000 Geocenter to KBO 39.96354884 +/- 0.0000 # Hcoef: 7.33
The following table shows the complete astrometric record for 181871. 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 (181871) followed by the observatory code and reference code for the source of the astrometry.
1999 02 12.26087 08 15 20.33 +19 27 39.6 23.1R 181871 568 Ca4208 1999 02 12.35267 08 15 19.88 +19 27 41.2 23.1R 181871 568 Ca4208 1999 02 17.39664 08 14 56.19 +19 28 57.5 23.1R 181871 568 Ca4208 1999 02 17.40828 08 14 56.13 +19 28 57.7 23.1R 181871 568 Ca4208 1999 04 08.24794 08 12 39.51 +19 36 22.5 23.5R 181871 568 Ca4507 1999 04 09.24066 08 12 39.08 +19 36 24.2 23.5R 181871 568 Ca4507 2000 01 01.55726 08 24 50.58 +18 55 05.8 181871 568 Ca8502 2000 01 01.60011 08 24 50.37 +18 55 06.4 23.2R 181871 568 Ca8502 2000 01 01.63744 08 24 50.18 +18 55 06.9 181871 568 Ca8502 2000 01 02.54290 08 24 45.94 +18 55 21.2 181871 568 Ca8502 2000 01 02.58410 08 24 45.73 +18 55 21.7 181871 568 Ca8502 2000 01 02.63432 08 24 45.49 +18 55 22.7 181871 568 Ca8502 2002 02 03.52390 08 33 50.73 +18 20 55.7 22.4R 181871 568 Cf1464 2002 02 03.59538 08 33 50.34 +18 20 57.2 181871 568 Cf1464 2002 02 04.45948 08 33 46.00 +18 21 13.4 181871 568 Cf1464 2007 11 08.47845 09 12 25.78 +15 38 48.3 181871 695 Cy3962 2007 11 09.45679 09 12 26.53 +15 38 44.1 181871 695 Cy3962 2008 03 04.20047 09 06 00.85 +16 06 09.1 181871 695 Cy7583 2008 03 04.28346 09 06 00.50 +16 06 10.7 181871 695 Cy7583 2008 03 05.30183 09 05 56.24 +16 06 29.5 181871 695 Cy7583 2015 04 15.15170 09 41 57.63 +13 10 31.5 23.2R 181871 695 C~1RYc 2015 04 15.21951 09 41 57.50 +13 10 32.2 181871 695 C~1RYc 2015 04 15.29631 09 41 57.36 +13 10 32.9 181871 695 C~1RYc 2016 01 11.302737 09 53 30.24 +12 09 54.2 181871 W84 C~3gGP 2016 01 11.303773 09 53 30.24 +12 09 54.2 181871 W84 C~3gGP 2019 04 05.162400 10 03 14.581 +11 15 09.81 23.4G 181871 G37 C~34up 2019 04 05.236260 10 03 14.362 +11 15 11.55 181871 G37 C~34up 2021 01 11.443500 10 19 12.197 +09 44 47.27 23.6G 181871 G37 C~4X2D 2021 01 11.484170 10 19 12.067 +09 44 48.18 181871 G37 C~4X2D 2021 01 11.523820 10 19 11.935 +09 44 48.78 181871 G37 C~4X2D
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 -0.39 0.00 -0.42
2 0.0003 0.00 -0.40 0.00 -0.25
3 0.0141 0.00 -0.22 0.00 -0.08
4 0.0141 0.00 -0.31 0.00 -0.05
5 0.1505 0.00 -0.00 0.00 0.14
6 0.1533 0.00 -0.02 0.00 0.17
7 0.8851 0.00 0.35 0.00 -0.28
8 0.8853 0.00 0.27 0.00 -0.34
9 0.8854 0.00 0.08 0.00 -0.42
10 0.8878 0.00 0.43 0.00 -0.41
11 0.8879 0.00 0.25 0.00 -0.56
12 0.8881 0.00 0.28 0.00 -0.34
13 2.9768 0.00 -0.05 0.00 0.57
14 2.9770 0.00 -0.39 0.00 0.78
15 2.9793 0.00 0.19 0.00 1.08
16 8.7371 0.00 -0.24 0.00 0.14
17 8.7398 0.00 -0.38 0.00 0.23
18 9.0566 0.00 0.16 0.00 0.16
19 9.0569 0.00 0.24 0.00 0.23
20 9.0597 0.00 0.12 0.00 0.34
21 16.1694 0.00 0.04 0.00 -0.04
22 16.1696 0.00 0.04 0.00 -0.01
23 16.1698 0.00 0.12 0.00 -0.07
24 16.9118 0.00 0.02 0.00 0.02
25 16.9118 0.00 0.08 0.00 0.00
26 20.1421 0.00 0.08 0.00 -0.32
27 20.1423 0.00 0.19 0.00 0.18
28 21.9143 0.00 -0.22 0.00 -0.27
29 21.9144 0.00 -0.15 0.00 -0.08
30 21.9145 0.00 -0.16 0.00 -0.17
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.
181871 quality flag:3 Type: 7:4EEE 7:4EEE 7:4EEE axisobj 43.765 43.765 43.765 ecceobj 0.089 0.089 0.089 incobj 0.804 0.804 0.804 qmin 39.399 39.397 39.401 qmax 48.360 48.362 48.357 amean 43.726 43.726 43.726 amin 43.341 43.340 43.341 amax 44.129 44.130 44.129 emean 0.085 0.085 0.085 emin 0.072 0.072 0.072 emax 0.097 0.097 0.097 imean 2.656 2.656 2.656 imin 1.833 1.832 1.833 imax 3.428 3.428 3.428 excite_mean 0.097 0.097 0.097 fracstop 1.000 1.000 1.000 cjmean 3.087 3.087 3.087 libcent 0 177.8 178.1 177.8 libamp 0 129.3 129.5 129.2 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 158.7 158.7 158.7 kozaiamp 180.0 180.0 180.0