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: 181867
# Created Sun Dec 22 02:06:59 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 37 observations of 37
# Arc: 20.15y
# First observation: 1999/02/10
# Last observation: 2019/04/05
# Chi-squared of fit: 179.58 DOF: 68 RMS: 0.39
# Min/Max residuals: -0.78 1.11
# Exact a, adot, b, bdot, g, gdot:
1.626508E-05 2.991275E-02 3.849191E-07 -2.863718E-03 2.653048E-02 3.201569E-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
0.237788 122.736597 -0.317959 0.003686 -0.940930 2451219.796963
# Heliocentric elements and errors
Epoch: 2451220.5000 = 1999/02/11
Mean Anomaly: 16.35859 +/- 0.000
Argument of Peri: 147.15224 +/- 0.000
Long of Asc Node: 305.61517 +/- 0.000
Inclination: 5.48647 +/- 0.000
Eccentricity: 0.29024937 +/- 0.0000
Semi-Major Axis: 52.74237066 +/- 0.0000
Time of Perihelion: 2444863.0740 +/- 0.0
Perihelion: 37.43393087 +/- 0.0000
Aphelion: 68.05081044 +/- 0.0000
Period (y) 383.0431 +/- 0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -21.15160432 +/- 0.0000
Ecliptic Y 32.32462800 +/- 0.0000
Ecliptic Z 0.15644142 +/- 0.0000
Ecliptic XDOT -0.00277759 +/- 0.0000
Ecliptic YDOT -0.00138136 +/- 0.0000
Ecliptic ZDOT -0.00029415 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 38.63017366 +/- 0.0000
Geocenter to KBO 37.69245950 +/- 0.0000
# Hcoef: 7.43
The following table shows the complete astrometric record for 181867. 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 (181867) followed by the observatory code and reference code for the source of the astrometry.
1999 02 10.29622 08 20 18.50 +19 46 46.2 23.0R 181867 568 Ca4013 1999 02 10.34765 08 20 18.24 +19 46 47.2 23.0R 181867 568 Ca4013 1999 02 18.29056 08 19 38.82 +19 48 43.0 23.0R 181867 568 Ca4013 1999 02 18.30215 08 19 38.78 +19 48 43.1 23.0R 181867 568 Ca4013 1999 04 08.30140 08 17 18.15 +19 54 48.8 23.2R 181867 568 Ca4843 1999 04 09.29774 08 17 17.68 +19 54 48.6 23.2R 181867 568 Ca4843 1999 05 06.26384 08 17 45.20 +19 52 26.7 22.9R 181867 568 Ca4843 1999 05 06.31388 08 17 45.30 +19 52 26.1 22.9R 181867 568 Ca4843 1999 12 29.62435 08 30 55.33 +19 01 22.4 181867 568 Ca8502 1999 12 29.64395 08 30 55.24 +19 01 22.6 181867 568 Ca8502 1999 12 30.61677 08 30 50.70 +19 01 37.3 181867 568 Ca8502 2000 01 29.20477 08 28 16.77 +19 09 52.6 181867 705 Ca9922 2000 01 29.23570 08 28 16.65 +19 09 53.3 23.2R 181867 705 Ca9922 2000 01 29.26670 08 28 16.48 +19 09 53.8 181867 705 Ca9922 2000 01 30.21987 08 28 11.34 +19 10 09.6 181867 705 Ca9922 2000 01 30.24484 08 28 11.16 +19 10 10.2 181867 705 Ca9922 2000 01 30.26921 08 28 11.05 +19 10 10.7 181867 705 Ca9922 2002 02 03.54222 08 41 15.78 +18 02 15.9 22.5R 181867 568 Cf1463 2002 02 03.60433 08 41 15.43 +18 02 17.7 181867 568 Cf1463 2006 01 19.34353 09 08 25.19 +15 31 58.9 22.7R 181867 250 S~06I2 2006 01 19.34793 09 08 25.17 +15 31 59.0 181867 250 S~06I2 2006 01 19.35233 09 08 25.15 +15 31 59.1 181867 250 S~06I2 2006 01 19.35673 09 08 25.12 +15 31 59.2 181867 250 S~06I2 2007 11 08.48626 09 23 20.72 +14 08 28.7 181867 695 Cy3962 2007 11 09.46497 09 23 21.82 +14 08 20.4 181867 695 Cy3962 2008 03 04.20979 09 17 07.72 +14 32 44.8 181867 695 Cy7583 2008 03 04.29547 09 17 07.34 +14 32 46.5 181867 695 Cy7583 2008 03 05.31851 09 17 02.88 +14 33 06.3 181867 695 Cy7583 2015 04 15.16142 09 55 13.44 +10 21 09.9 23.6R 181867 695 C~1RYc 2015 04 15.23119 09 55 13.28 +10 21 11.0 181867 695 C~1RYc 2015 04 15.30854 09 55 13.13 +10 21 11.5 181867 695 C~1RYc 2016 01 10.318814 10 06 59.30 +09 10 20.7 181867 W84 C~3gGP 2016 01 10.319913 10 06 59.30 +09 10 20.5 181867 W84 C~3gGP 2017 03 29.022367 10 06 48.70 +09 01 17.4 181867 W84 C~3gGP 2017 03 29.056111 10 06 48.59 +09 01 17.6 181867 W84 C~3gGP 2019 04 05.171320 10 16 57.383 +07 48 31.36 23.8G 181867 G37 C~34up 2019 04 05.244910 10 16 57.152 +07 48 32.85 181867 G37 C~34up
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 0.23 0.00 -0.49
2 0.0001 0.00 0.35 0.00 -0.29
3 0.0219 0.00 -0.04 0.00 -0.36
4 0.0219 0.00 0.21 0.00 -0.42
5 0.1561 0.00 -0.10 0.00 -0.78
6 0.1588 0.00 -0.02 0.00 -0.56
7 0.2326 0.00 -0.38 0.00 -0.51
8 0.2328 0.00 -0.67 0.00 -0.60
9 0.8825 0.00 0.27 0.00 0.21
10 0.8825 0.00 0.31 0.00 0.13
11 0.8852 0.00 0.35 0.00 0.19
12 0.9662 0.00 -0.50 0.00 0.71
13 0.9663 0.00 0.24 0.00 0.87
14 0.9664 0.00 0.24 0.00 0.84
15 0.9690 0.00 0.22 0.00 0.24
16 0.9691 0.00 -0.43 0.00 0.41
17 0.9691 0.00 -0.08 0.00 0.49
18 2.9822 0.00 0.26 0.00 0.44
19 2.9824 0.00 -0.03 0.00 1.11
20 6.9406 0.00 0.01 0.00 -0.69
21 6.9406 0.00 0.03 0.00 -0.67
22 6.9406 0.00 0.05 0.00 -0.66
23 6.9406 0.00 -0.07 0.00 -0.65
24 8.7425 0.00 -0.15 0.00 -0.30
25 8.7452 0.00 -0.19 0.00 -0.13
26 9.0620 0.00 0.02 0.00 0.28
27 9.0623 0.00 0.05 0.00 0.31
28 9.0651 0.00 0.01 0.00 0.33
29 16.1749 0.00 0.33 0.00 0.10
30 16.1750 0.00 0.20 0.00 0.32
31 16.1753 0.00 0.43 0.00 -0.15
32 16.9145 0.00 0.04 0.00 0.30
33 16.9145 0.00 0.10 0.00 0.08
34 18.1293 0.00 -0.22 0.00 0.29
35 18.1294 0.00 -0.09 0.00 -0.19
36 20.1475 0.00 -0.23 0.00 -0.21
37 20.1477 0.00 -0.14 0.00 -0.15
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.
181867 quality flag:3 Type: 7:3EEEE 7:3EEEE 7:3EEEE axisobj 52.975 52.975 52.975 ecceobj 0.293 0.293 0.293 incobj 5.478 5.478 5.478 qmin 36.852 36.852 36.853 qmax 70.020 70.011 70.031 amean 52.970 52.969 52.970 amin 52.337 52.337 52.338 amax 53.729 53.725 53.734 emean 0.287 0.287 0.287 emin 0.269 0.269 0.269 emax 0.303 0.303 0.303 imean 7.506 7.507 7.506 imin 6.559 6.561 6.557 imax 8.738 8.740 8.737 excite_mean 0.315 0.315 0.315 fracstop 1.000 1.000 1.000 cjmean 3.087 3.087 3.087 libcent 0 179.7 179.7 179.3 libamp 0 91.1 91.5 91.1 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 231.8 231.8 231.8 kozaiamp 180.0 180.0 180.0