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: 181902
# Created Sat Apr 20 01:07:39 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 28 observations of 28
# Arc: 22.08y
# First observation: 1999/09/06
# Last observation: 2021/10/03
# Chi-squared of fit: 31.46 DOF: 50 RMS: 0.19
# Min/Max residuals: -0.43 0.54
# Exact a, adot, b, bdot, g, gdot:
1.785387E-05 3.112467E-02 -7.495077E-06 -1.429391E-02 2.645034E-02 5.590483E-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
9.035707 12.394894 0.486808 0.137188 -0.864084 2451428.060963
# Heliocentric elements and errors
Epoch: 2451428.5000 = 1999/09/07
Mean Anomaly: 2.66620 +/- 0.000
Argument of Peri: 138.39175 +/- 0.000
Long of Asc Node: 210.35186 +/- 0.000
Inclination: 25.86612 +/- 0.000
Eccentricity: 0.70222400 +/- 0.0000
Semi-Major Axis: 126.34004831 +/- 0.0000
Time of Perihelion: 2447587.0104 +/- 0.0
Perihelion: 37.62103377 +/- 0.0000
Aphelion: 215.05906286 +/- 0.0000
Period (y) 1420.1027 +/- 0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 37.43385437 +/- 0.0000
Ecliptic Y 7.72931525 +/- 0.0000
Ecliptic Z 5.93726382 +/- 0.0000
Ecliptic XDOT 0.00008951 +/- 0.0000
Ecliptic YDOT 0.00332746 +/- 0.0000
Ecliptic ZDOT -0.00137025 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 38.68174968 +/- 0.0000
Geocenter to KBO 37.80660224 +/- 0.0000
# Hcoef: 7.27
The following table shows the complete astrometric record for 181902. 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 (181902) followed by the observatory code and reference code for the source of the astrometry.
1999 09 06.56022 00 31 10.48 +13 12 13.2 23.0R 181902 568 Ca8546 1999 09 06.59742 00 31 10.32 +13 12 12.2 22.9R 181902 568 Ca8546 1999 09 06.62994 00 31 10.18 +13 12 11.6 22.9R 181902 568 Ca8546 1999 09 10.54671 00 30 54.09 +13 10 22.2 23.4R 181902 568 Ca8546 1999 09 10.55715 00 30 54.06 +13 10 21.8 23.2R 181902 568 Ca8546 1999 10 08.50808 00 28 49.02 +12 54 17.2 23.2R 181902 568 Ca8546 1999 10 08.53390 00 28 48.93 +12 54 16.3 23.1R 181902 568 Ca8546 1999 11 10.37659 00 26 37.82 +12 32 30.8 23.1R 181902 568 Ca8546 1999 11 10.41134 00 26 37.70 +12 32 29.3 23.0R 181902 568 Ca8546 2000 08 28.41863 00 39 43.41 +13 12 54.5 23.0R 181902 568 Cb9109 2000 08 28.45126 00 39 43.30 +13 12 53.7 181902 568 Cb9109 2000 08 29.57009 00 39 39.36 +13 12 29.0 22.9R 181902 568 Cb9109 2000 12 27.23400 00 33 36.217 +12 07 49.99 22.5R 181902 568 Cl2513 2000 12 28.24333 00 33 37.226 +12 07 34.10 22.3R 181902 568 Cl2513 2003 11 22.11659 00 57 26.48 +12 12 45.4 23.0R 181902 695 Cj3572 2003 11 22.17613 00 57 26.32 +12 12 43.6 181902 695 Cj3572 2007 09 11.40438 01 31 59.48 +12 26 05.3 22.5r 181902 695 Cv8413 2007 09 11.45410 01 31 59.32 +12 26 04.3 22.1r 181902 695 Cv8413 2007 09 17.33490 01 31 38.54 +12 23 30.4 181902 675 Cy6666 2007 09 17.34721 01 31 38.49 +12 23 30.0 181902 675 Cy6666 2007 09 17.37645 01 31 38.38 +12 23 29.1 181902 675 Cy6666 2007 09 17.38199 01 31 38.34 +12 23 29.1 181902 675 Cy6666 2007 09 17.38906 01 31 38.34 +12 23 28.8 181902 675 Cy6666 2017 11 12.182616 02 33 28.16 +10 15 58.8 23.7R 181902 W84 C~3oel 2017 11 12.184491 02 33 28.15 +10 15 58.7 181902 W84 C~3oel 2021 10 03.410120 02 58 51.101 +09 46 39.05 23.9G 181902 G37 C~586u 2021 10 03.442540 02 58 50.998 +09 46 38.24 181902 G37 C~586u 2021 10 03.475310 02 58 50.887 +09 46 37.49 181902 G37 C~586u
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 0.24 0.00 -0.14
2 0.0001 0.00 0.13 0.00 -0.13
3 0.0002 0.00 0.02 0.00 0.15
4 0.0109 0.00 -0.14 0.00 0.03
5 0.0109 0.00 0.08 0.00 -0.07
6 0.0875 0.00 0.10 0.00 -0.06
7 0.0875 0.00 0.54 0.00 0.05
8 0.1775 0.00 0.03 0.00 0.31
9 0.1776 0.00 -0.09 0.00 0.15
10 0.9770 0.00 -0.16 0.00 -0.29
11 0.9771 0.00 -0.07 0.00 -0.39
12 0.9802 0.00 -0.14 0.00 -0.38
13 1.3078 0.00 -0.27 0.00 0.10
14 1.3106 0.00 -0.32 0.00 0.17
15 4.2096 0.00 -0.43 0.00 0.23
16 4.2098 0.00 -0.17 0.00 0.39
17 8.0133 0.00 -0.09 0.00 -0.13
18 8.0134 0.00 0.08 0.00 0.12
19 8.0295 0.00 0.20 0.00 0.06
20 8.0295 0.00 0.15 0.00 -0.00
21 8.0296 0.00 0.15 0.00 -0.11
22 8.0296 0.00 -0.13 0.00 0.04
23 8.0296 0.00 0.27 0.00 -0.06
24 18.1838 0.00 0.06 0.00 -0.05
25 18.1838 0.00 0.03 0.00 -0.10
26 22.0749 0.00 -0.05 0.00 -0.02
27 22.0750 0.00 -0.01 0.00 -0.01
28 22.0751 0.00 -0.08 0.00 0.08
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.
181902 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 125.992 125.994 125.991 ecceobj 0.701 0.701 0.701 incobj 25.867 25.867 25.867 qmin 36.261 36.198 35.902 qmax 217.687 217.291 217.423 amean 123.001 122.938 123.074 amin 120.273 120.390 120.467 amax 127.510 127.295 127.842 emean 0.690 0.690 0.692 emin 0.678 0.678 0.679 emax 0.707 0.707 0.709 imean 26.861 26.857 26.644 imin 25.700 25.589 25.341 imax 27.754 27.735 27.618 excite_mean 0.825 0.825 0.825 fracstop 1.000 1.000 1.000 cjmean 2.854 2.854 2.853 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 194.1 193.0 193.8 kozaiamp 55.1 54.9 56.2