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: 02WL21
# Created Wed Dec 25 02:08:22 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 25 observations of 25
# Arc: 18.12y
# First observation: 2002/11/28
# Last observation: 2021/01/11
# Chi-squared of fit: 46.41 DOF: 44 RMS: 0.24
# Min/Max residuals: -0.47 0.48
# Exact a, adot, b, bdot, g, gdot:
1.603329E-05 2.437042E-02 5.084738E-07 1.075653E-03 2.461054E-02 6.386763E-04
# Covariance matrix:
1.9254E-13 -6.3529E-14 3.2084E-15 -2.3214E-15 -1.2933E-13 -1.1034E-13
-6.3529E-14 3.9526E-14 -2.1973E-15 1.5914E-15 9.0193E-14 7.5623E-14
3.2084E-15 -2.1973E-15 1.1096E-13 -7.5342E-15 -4.2291E-15 -4.4038E-15
-2.3214E-15 1.5914E-15 -7.5342E-15 1.0830E-15 3.3061E-15 3.1658E-15
-1.2933E-13 9.0193E-14 -4.2291E-15 3.3061E-15 4.4239E-13 1.5475E-13
-1.1034E-13 7.5623E-14 -4.4038E-15 3.1658E-15 1.5475E-13 1.5067E-13
# lat0 lon0 xBary yBary zBary JD0
0.336429 75.432022 0.165979 0.005681 -0.968466 2452606.845423
# Heliocentric elements and errors
Epoch: 2452606.5000 = 2002/11/28
Mean Anomaly: 25.16817 +/- 0.047
Argument of Peri: 339.90026 +/- 0.051
Long of Asc Node: 67.80622 +/- 0.001
Inclination: 2.54906 +/- 0.000
Eccentricity: 0.04553854 +/- 0.0001
Semi-Major Axis: 43.37669101 +/- 0.0044
Time of Perihelion: 2445311.3851 +/- 13.5
Perihelion: 41.40137993 +/- 0.0050
Aphelion: 45.35200209 +/- 0.0054
Period (y) 285.6885 +/- 0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 10.62267436 +/- 0.0003
Ecliptic Y 40.22663811 +/- 0.0011
Ecliptic Z 0.23860171 +/- 0.0000
Ecliptic XDOT -0.00261362 +/- 0.0000
Ecliptic YDOT 0.00074635 +/- 0.0000
Ecliptic ZDOT 0.00012029 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 41.60624333 +/- 0.0010
Geocenter to KBO 40.63301191 +/- 0.0011
# Hcoef: 7.61
The following table shows the complete astrometric record for 02WL21. 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 (02WL21) followed by the observatory code and reference code for the source of the astrometry.
2002 11 28.34468 04 56 34.85 +22 58 38.9 23.3R 02WL21 568 Cq9881 2002 11 28.39313 04 56 34.59 +22 58 38.4 23.4R 02WL21 568 Cq9881 2002 11 28.46548 04 56 34.21 +22 58 38.0 23.5R 02WL21 568 Cq9881 2002 11 29.33724 04 56 29.57 +22 58 31.4 02WL21 568 Cq9881 2003 10 03.47532 05 06 06.40 +23 14 46.0 23.7i 02WL21 568 Cq9881 2003 10 03.53159 05 06 06.30 +23 14 45.9 23.8i 02WL21 568 Cq9881 2003 10 03.58753 05 06 06.22 +23 14 45.8 23.7i 02WL21 568 Cq9881 2003 12 16.33458 05 01 00.60 +23 09 00.5 24.5g 02WL21 568 Cq9881 2003 12 16.36097 05 01 00.46 +23 09 00.1 24.1g 02WL21 568 Cq9881 2003 12 16.38727 05 01 00.31 +23 09 00.0 24.2g 02WL21 568 Cq9881 2003 12 17.40625 05 00 54.87 +23 08 52.6 02WL21 568 Cq9881 2005 11 05.50006 05 16 26.45 +23 34 39.4 02WL21 695 Cq9881 2006 12 06.48171 05 19 56.89 +23 42 13.1 23.0R 02WL21 250 S~06Ab 2006 12 06.48611 05 19 56.86 +23 42 13.1 02WL21 250 S~06Ab 2006 12 06.49051 05 19 56.84 +23 42 13.1 02WL21 250 S~06Ab 2006 12 06.49491 05 19 56.81 +23 42 13.1 02WL21 250 S~06Ab 2015 02 18.13741 06 02 41.21 +24 29 13.2 23.4R 02WL21 695 C~1M67 2015 02 18.18449 06 02 41.08 +24 29 13.3 02WL21 695 C~1M67 2015 02 18.23098 06 02 40.98 +24 29 13.1 02WL21 695 C~1M67 2020 12 09.397220 06 44 06.655 +24 25 37.72 02WL21 G37 C~4Twe 2020 12 09.446100 06 44 06.381 +24 25 38.45 02WL21 G37 C~4Twe 2020 12 09.493910 06 44 06.179 +24 25 38.43 02WL21 G37 C~4Twe 2021 01 11.314240 06 41 12.128 +24 28 56.68 23.6G 02WL21 G37 C~4Twe 2021 01 11.358980 06 41 11.882 +24 28 56.99 02WL21 G37 C~4Twe 2021 01 11.402030 06 41 11.634 +24 28 57.01 02WL21 G37 C~4Twe
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 -0.09 0.00 0.03
2 0.0001 0.00 -0.07 0.00 -0.13
3 0.0003 0.00 0.08 0.00 -0.00
4 0.0027 0.00 -0.17 0.00 -0.18
5 0.8464 0.00 -0.02 0.00 0.25
6 0.8465 0.00 -0.22 0.00 0.17
7 0.8467 0.00 -0.11 0.00 0.11
8 1.0486 0.00 0.02 0.00 0.41
9 1.0486 0.00 0.07 0.00 0.19
10 1.0487 0.00 -0.04 0.00 0.27
11 1.0515 0.00 0.03 0.00 -0.01
12 2.9381 0.00 -0.30 0.00 0.41
13 4.0223 0.00 0.48 0.00 -0.47
14 4.0223 0.00 0.38 0.00 -0.46
15 4.0223 0.00 0.44 0.00 -0.44
16 4.0223 0.00 0.35 0.00 -0.42
17 12.2239 0.00 -0.12 0.00 0.01
18 12.2241 0.00 -0.30 0.00 0.14
19 12.2242 0.00 -0.06 0.00 -0.02
20 18.0316 0.00 0.08 0.00 -0.06
21 18.0318 0.00 -0.36 0.00 0.36
22 18.0319 0.00 0.20 0.00 0.05
23 18.1218 0.00 0.25 0.00 -0.04
24 18.1219 0.00 0.16 0.00 0.04
25 18.1220 0.00 -0.09 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.
02WL21 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.431 43.431 43.431 ecceobj 0.048 0.048 0.048 incobj 2.545 2.545 2.545 qmin 39.899 39.912 39.906 qmax 46.675 46.684 46.654 amean 43.157 43.157 43.156 amin 42.819 42.818 42.820 amax 43.511 43.513 43.504 emean 0.054 0.054 0.054 emin 0.033 0.033 0.033 emax 0.073 0.073 0.072 imean 1.045 1.045 1.045 imin 0.020 0.020 0.020 imax 1.712 1.712 1.711 excite_mean 0.058 0.058 0.058 fracstop 1.000 1.000 1.000 cjmean 3.087 3.087 3.087 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 163.5 163.5 163.5 kozaiamp 180.0 180.0 180.0