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: 181868
# Created Sun Nov 24 02:06:55 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 34 observations of 34
# Arc: 21.92y
# First observation: 1999/02/11
# Last observation: 2021/01/11
# Chi-squared of fit: 156.26 DOF: 62 RMS: 0.38
# Min/Max residuals: -1.09 0.92
# Exact a, adot, b, bdot, g, gdot:
1.562394E-05 2.266917E-02 4.013649E-07 -6.801872E-03 2.393385E-02 -6.553902E-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
0.515536 122.127280 -0.344204 0.008166 -0.931900 2451220.782433
# Heliocentric elements and errors
Epoch: 2451220.5000 = 1999/02/11
Mean Anomaly: 312.48109 +/- 0.000
Argument of Peri: 256.25615 +/- 0.000
Long of Asc Node: 304.26148 +/- 0.000
Inclination: 16.70298 +/- 0.000
Eccentricity: 0.28809567 +/- 0.0000
Semi-Major Axis: 49.36383171 +/- 0.0000
Time of Perihelion: 2467942.0171 +/- 0.0
Perihelion: 35.14232549 +/- 0.0000
Aphelion: 63.58533794 +/- 0.0000
Period (y) 346.8339 +/- 0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -22.99811876 +/- 0.0000
Ecliptic Y 35.98820259 +/- 0.0000
Ecliptic Z 0.37595302 +/- 0.0000
Ecliptic XDOT -0.00180281 +/- 0.0000
Ecliptic YDOT -0.00199900 +/- 0.0000
Ecliptic ZDOT -0.00078480 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.71089252 +/- 0.0000
Geocenter to KBO 41.78204447 +/- 0.0000
# Hcoef: 7.49
The following table shows the complete astrometric record for 181868. 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 (181868) followed by the observatory code and reference code for the source of the astrometry.
1999 02 11.28169 08 18 03.06 +20 11 17.9 23.3R 181868 568 Ca4178 1999 02 11.36257 08 18 02.67 +20 11 18.7 23.3R 181868 568 Ca4178 1999 02 17.42087 08 17 34.33 +20 12 25.4 23.3R 181868 568 Ca4178 1999 02 17.48816 08 17 34.01 +20 12 26.4 23.3R 181868 568 Ca4178 1999 04 08.27506 08 15 14.72 +20 16 13.4 24.1R 181868 568 Ca4506 1999 04 09.26671 08 15 14.13 +20 16 10.8 24.1R 181868 568 Ca4506 1999 12 29.61447 08 26 42.95 +19 20 55.1 181868 568 Ca8502 1999 12 29.63415 08 26 42.85 +19 20 55.3 181868 568 Ca8502 1999 12 30.60682 08 26 38.47 +19 21 06.8 181868 568 Ca8502 2000 01 29.13520 08 24 11.82 +19 27 33.3 181868 705 Ca9922 2000 01 29.16005 08 24 11.67 +19 27 34.2 181868 705 Ca9922 2000 01 29.19411 08 24 11.49 +19 27 34.5 23.9R 181868 705 Ca9922 2000 01 30.23695 08 24 06.12 +19 27 48.8 181868 705 Ca9922 2000 01 30.26146 08 24 05.98 +19 27 49.2 181868 705 Ca9922 2000 01 30.28768 08 24 05.89 +19 27 49.4 181868 705 Ca9922 2001 02 23.13358 08 27 10.95 +18 51 02.3 23.5R 181868 309 Cc6423 2001 02 23.19969 08 27 10.66 +18 51 03.1 23.4R 181868 309 Cc6423 2001 02 24.11119 08 27 06.74 +18 51 13.6 181868 309 Cc6423 2005 01 19.408955 08 50 31.93 +15 43 52.2 181868 645 C~1Rza 2005 01 19.409785 08 50 31.93 +15 43 52.3 181868 645 C~1Rza 2005 01 19.412272 08 50 31.92 +15 43 52.3 181868 645 C~1Rza 2005 02 04.204562 08 49 11.32 +15 48 06.5 181868 645 C~1dEJ 2005 02 04.205391 08 49 11.31 +15 48 06.5 181868 645 C~1dEJ 2005 02 04.207879 08 49 11.31 +15 48 06.5 181868 645 C~1dEJ 2007 11 08.46959 09 09 14.70 +13 14 26.6 181868 695 Cy3962 2007 11 09.44827 09 09 15.33 +13 14 14.9 181868 695 Cy3962 2013 03 13.18292 09 28 23.85 +09 13 47.8 22.4R 181868 695 C~0upI 2013 03 14.17468 09 28 19.73 +09 14 08.1 181868 695 C~0upI 2013 03 14.26206 09 28 19.37 +09 14 10.1 181868 695 C~0upI 2016 02 29.276366 09 45 46.15 +06 20 36.6 181868 W84 C~3gGP 2016 02 29.280197 09 45 46.14 +06 20 36.9 181868 W84 C~3gGP 2021 01 11.439700 10 17 45.699 +01 08 04.89 22.7G 181868 G37 C~4X2D 2021 01 11.480330 10 17 45.557 +01 08 04.97 181868 G37 C~4X2D 2021 01 11.520010 10 17 45.405 +01 08 05.39 181868 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 -0.38 0.00 -0.95
2 0.0002 0.00 -0.31 0.00 -1.09
3 0.0168 0.00 -0.40 0.00 -0.77
4 0.0170 0.00 -0.53 0.00 -0.46
5 0.1533 0.00 0.50 0.00 -0.47
6 0.1560 0.00 0.50 0.00 -0.46
7 0.8798 0.00 0.42 0.00 -0.10
8 0.8798 0.00 0.26 0.00 -0.12
9 0.8825 0.00 0.32 0.00 -0.03
10 0.9633 0.00 0.42 0.00 -0.10
11 0.9634 0.00 0.09 0.00 0.46
12 0.9635 0.00 0.04 0.00 0.30
13 0.9663 0.00 -0.38 0.00 0.61
14 0.9664 0.00 -0.57 0.00 0.68
15 0.9665 0.00 0.12 0.00 0.53
16 2.0338 0.00 -0.10 0.00 0.57
17 2.0340 0.00 -0.06 0.00 0.63
18 2.0365 0.00 0.05 0.00 0.92
19 5.9387 0.00 -0.07 0.00 -0.24
20 5.9387 0.00 -0.01 0.00 -0.16
21 5.9388 0.00 0.03 0.00 -0.19
22 5.9820 0.00 -0.18 0.00 0.13
23 5.9820 0.00 -0.27 0.00 0.11
24 5.9820 0.00 -0.08 0.00 0.07
25 8.7397 0.00 0.05 0.00 0.12
26 8.7424 0.00 0.12 0.00 0.18
27 14.0832 0.00 0.15 0.00 0.07
28 14.0859 0.00 0.10 0.00 0.02
29 14.0862 0.00 0.21 0.00 0.23
30 17.0486 0.00 0.27 0.00 -0.15
31 17.0486 0.00 0.41 0.00 0.06
32 21.9169 0.00 -0.31 0.00 -0.13
33 21.9170 0.00 -0.18 0.00 -0.27
34 21.9171 0.00 -0.25 0.00 -0.06
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.
181868 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 49.525 49.525 49.526 ecceobj 0.289 0.289 0.289 incobj 16.677 16.677 16.677 qmin 34.474 34.501 34.612 qmax 65.267 65.373 65.152 amean 49.495 49.563 49.524 amin 49.005 49.029 48.976 amax 50.165 50.207 50.159 emean 0.283 0.284 0.280 emin 0.266 0.266 0.261 emax 0.303 0.302 0.300 imean 18.522 18.508 18.684 imin 17.721 17.711 17.903 imax 19.221 19.224 19.410 excite_mean 0.426 0.426 0.426 fracstop 1.000 1.000 1.000 cjmean 2.939 2.939 2.939 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 188.3 189.0 182.5 kozaiamp 180.0 180.0 180.0