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: 20KM55
# Created Tue Apr 1 01:11:20 2025
# Orbit generated from Bernstein formalism
# Fitting 18 observations of 18
# Arc: 76.97d
# First observation: 2020/05/29
# Last observation: 2020/08/14
Preliminary a, adot, b, bdot, g, gdot:
0.000001 0.016727 0.000004 -0.000400 0.022060 0.000000
# Chi-squared of fit: 0.89 DOF: 30 RMS: 0.04
# Min/Max residuals: -0.08 0.09
# Exact a, adot, b, bdot, g, gdot:
1.517322E-05 2.186352E-02 -1.958481E-07 -3.979515E-04 2.292234E-02 -1.873764E-03
# Covariance matrix:
2.9222E-13 5.8100E-11 -4.1354E-14 -1.1348E-14 1.1787E-11 3.7836E-10
5.8100E-11 1.5769E-07 -1.0521E-10 -4.9039E-12 2.9214E-08 4.8069E-07
-4.1354E-14 -1.0521E-10 2.4566E-13 -1.0196E-12 -1.9511E-11 -3.2473E-10
-1.1348E-14 -4.9039E-12 -1.0196E-12 1.1119E-11 -9.9226E-13 -3.4858E-11
1.1787E-11 2.9214E-08 -1.9511E-11 -9.9226E-13 5.4202E-09 9.0805E-08
3.7836E-10 4.8069E-07 -3.2473E-10 -3.4858E-11 9.0805E-08 1.8802E-06
# lat0 lon0 xBary yBary zBary JD0
2.511200 -73.190312 0.634651 0.034244 -0.783732 2458998.947781
# Heliocentric elements and errors
Epoch: 2458990.5000 = 2020/05/21
Mean Anomaly: 296.84549 +/- 15.211
Argument of Peri: 186.98616 +/- 23.805
Long of Asc Node: 173.64633 +/- 0.475
Inclination: 2.66624 +/- 0.009
Eccentricity: 0.10675226 +/- 0.0543
Semi-Major Axis: 46.20306002 +/- 0.7529
Time of Perihelion: 2479114.1337 +/- 4821.9
Perihelion: 41.27077912 +/- 2.5959
Aphelion: 51.13534092 +/- 2.6421
Period (y) 314.0612 +/- 7.68
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 12.22911773 +/- 0.0405
Ecliptic Y -42.66270705 +/- 0.1340
Ecliptic Z 1.91150226 +/- 0.0062
Ecliptic XDOT 0.00244386 +/- 0.0001
Ecliptic YDOT 0.00097078 +/- 0.0001
Ecliptic ZDOT -0.00005752 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 44.42197355 +/- 0.1292
Geocenter to KBO 43.62556740 +/- 0.1401
# Hcoef: 9.43
The following table shows the complete astrometric record for 20KM55. 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 (20KM55) followed by the observatory code and reference code for the source of the astrometry.
2020 05 29.44698 19 11 34.370 -19 53 24.02 25.8r 20KM55 266 C~6c5b 2020 05 29.53371 19 11 34.057 -19 53 24.39 25.8r 20KM55 266 C~6c5b 2020 05 29.61905 19 11 33.748 -19 53 24.74 25.8r 20KM55 266 C~6c5b 2020 05 31.44139 19 11 27.219 -19 53 32.51 25.7r 20KM55 266 C~6c5b 2020 05 31.52961 19 11 26.890 -19 53 32.91 25.7r 20KM55 266 C~6c5b 2020 05 31.61814 19 11 26.559 -19 53 33.29 25.7r 20KM55 266 C~6c5b 2020 06 21.45390 19 09 59.891 -19 55 33.81 25.7r 20KM55 266 C~6c5b 2020 06 21.53376 19 09 59.520 -19 55 34.36 25.7r 20KM55 266 C~6c5b 2020 06 21.61261 19 09 59.155 -19 55 34.90 25.7r 20KM55 266 C~6c5b 2020 06 24.43648 19 09 46.171 -19 55 55.19 26.1r 20KM55 266 C~6c5b 2020 06 24.52458 19 09 45.755 -19 55 55.83 26.1r 20KM55 266 C~6c5b 2020 06 24.61708 19 09 45.320 -19 55 56.48 26.1r 20KM55 266 C~6c5b 2020 08 12.26680 19 06 05.392 -20 02 41.31 25.8r 20KM55 266 C~6c5b 2020 08 12.34843 19 06 05.078 -20 02 41.99 25.8r 20KM55 266 C~6c5b 2020 08 12.42950 19 06 04.767 -20 02 42.65 25.8r 20KM55 266 C~6c5b 2020 08 14.24286 19 05 58.061 -20 02 57.60 25.9r 20KM55 266 C~6c5b 2020 08 14.33285 19 05 57.725 -20 02 58.35 25.9r 20KM55 266 C~6c5b 2020 08 14.42134 19 05 57.396 -20 02 59.06 25.9r 20KM55 266 C~6c5b
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 -0.02 0.00 -0.02
2 0.0002 -4.43 -0.02 0.17 -0.02
3 0.0005 -8.80 -0.02 0.36 -0.02
4 0.0055 -101.15 0.02 3.90 0.01
5 0.0057 -105.80 0.02 4.07 0.01
6 0.0059 -110.48 0.02 4.27 0.02
7 0.0630 -1338.42 0.03 32.63 0.08
8 0.0632 -1343.68 0.03 32.71 0.09
9 0.0634 -1348.86 0.04 32.79 0.08
10 0.0712 -1533.07 -0.04 34.59 -0.08
11 0.0714 -1538.98 -0.04 34.65 -0.08
12 0.0716 -1545.14 -0.03 34.74 -0.08
13 0.2048 -4672.17 0.03 -4.78 0.02
14 0.2051 -4676.65 0.03 -4.95 0.02
15 0.2053 -4681.08 0.03 -5.11 0.02
16 0.2103 -4776.72 -0.02 -9.18 -0.01
17 0.2105 -4781.51 -0.03 -9.38 -0.02
18 0.2107 -4786.20 -0.02 -9.56 -0.01
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.
20KM55 quality flag:1 Type: CLASSICAL CLASSICAL SCATNEAR axisobj 45.640 50.403 43.341 ecceobj 0.107 0.143 0.184 incobj 2.667 2.643 2.690 qmin 40.187 42.681 34.500 qmax 51.824 59.125 53.189 amean 45.847 50.709 43.526 amin 45.467 50.267 43.115 amax 46.270 51.212 44.037 emean 0.107 0.145 0.172 emin 0.094 0.134 0.142 emax 0.120 0.155 0.208 imean 3.024 2.712 4.595 imin 2.479 2.495 2.115 imax 3.506 2.896 6.983 excite_mean 0.120 0.152 0.193 fracstop 1.000 1.000 1.000 cjmean 3.107 3.159 3.051 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 183.4 177.1 180.9 kozaiamp 180.0 180.0 179.9