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: 20KU55
# Created Tue Apr 1 01:11:20 2025
# Orbit generated from Bernstein formalism
# Fitting 18 observations of 18
# Arc: 75.98d
# First observation: 2020/05/30
# Last observation: 2020/08/14
Preliminary a, adot, b, bdot, g, gdot:
0.000000 0.015958 0.000004 -0.001870 0.021982 0.000000
# Chi-squared of fit: 0.33 DOF: 30 RMS: 0.02
# Min/Max residuals: -0.03 0.04
# Exact a, adot, b, bdot, g, gdot:
1.477996E-05 2.159896E-02 -1.206865E-06 -1.866292E-03 2.294137E-02 4.032397E-04
# Covariance matrix:
2.9937E-13 7.0062E-11 -4.5331E-14 -1.3358E-13 1.4003E-11 4.2359E-10
7.0062E-11 1.7789E-07 -1.1186E-10 -1.4215E-10 3.2861E-08 5.3701E-07
-4.5331E-14 -1.1186E-10 2.4412E-13 -9.3554E-13 -2.0670E-11 -3.3904E-10
-1.3358E-13 -1.4215E-10 -9.3554E-13 1.1548E-11 -2.6947E-11 -5.9421E-10
1.4003E-11 3.2861E-08 -2.0670E-11 -2.6947E-11 6.0784E-09 1.0108E-07
4.2359E-10 5.3701E-07 -3.3904E-10 -5.9421E-10 1.0108E-07 2.0706E-06
# lat0 lon0 xBary yBary zBary JD0
2.527336 -72.932777 0.625071 0.034804 -0.791420 2458999.940151
# Heliocentric elements and errors
Epoch: 2458990.5000 = 2020/05/21
Mean Anomaly: 20.19953 +/- 242.644
Argument of Peri: 132.32912 +/- 249.856
Long of Asc Node: 133.10980 +/- 0.478
Inclination: 5.48182 +/- 0.091
Eccentricity: 0.01215854 +/- 0.0507
Semi-Major Axis: 44.90483567 +/- 1.2584
Time of Perihelion: 2452823.4584 +/- 74080.3
Perihelion: 44.35885841 +/- 2.5931
Aphelion: 45.45081293 +/- 2.6079
Period (y) 300.9178 +/- 12.65
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 12.42136446 +/- 0.0434
Ecliptic Y -42.57680604 +/- 0.1415
Ecliptic Z 1.92213642 +/- 0.0065
Ecliptic XDOT 0.00248923 +/- 0.0001
Ecliptic YDOT 0.00070474 +/- 0.0002
Ecliptic ZDOT -0.00022062 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 44.39334765 +/- 0.1362
Geocenter to KBO 43.58937336 +/- 0.1481
# Hcoef: 9.56
The following table shows the complete astrometric record for 20KU55. 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 (20KU55) followed by the observatory code and reference code for the source of the astrometry.
2020 05 30.43935 19 12 39.018 -19 50 32.24 25.8r 20KU55 266 C~6c5c 2020 05 30.53044 19 12 38.685 -19 50 32.72 25.8r 20KU55 266 C~6c5c 2020 05 30.61862 19 12 38.362 -19 50 33.17 25.8r 20KU55 266 C~6c5c 2020 06 01.43269 19 12 31.772 -19 50 42.80 26.2r 20KU55 266 C~6c5c 2020 06 01.47325 19 12 31.619 -19 50 43.03 26.2r 20KU55 266 C~6c5c 2020 06 01.60571 19 12 31.118 -19 50 43.75 26.2r 20KU55 266 C~6c5c 2020 06 21.45390 19 11 08.245 -19 52 58.01 26.0r 20KU55 266 C~6c5c 2020 06 21.53376 19 11 07.874 -19 52 58.64 26.0r 20KU55 266 C~6c5c 2020 06 21.61261 19 11 07.509 -19 52 59.24 26.0r 20KU55 266 C~6c5c 2020 06 24.43648 19 10 54.534 -19 53 22.10 25.9r 20KU55 266 C~6c5c 2020 06 24.51619 19 10 54.158 -19 53 22.75 25.9r 20KU55 266 C~6c5c 2020 06 24.59604 19 10 53.782 -19 53 23.39 25.9r 20KU55 266 C~6c5c 2020 08 12.26680 19 07 13.402 -20 00 55.14 26.0r 20KU55 266 C~6c5c 2020 08 12.34843 19 07 13.087 -20 00 55.90 26.0r 20KU55 266 C~6c5c 2020 08 12.42950 19 07 12.774 -20 00 56.64 26.0r 20KU55 266 C~6c5c 2020 08 14.24286 19 07 06.038 -20 01 13.29 25.9r 20KU55 266 C~6c5c 2020 08 14.33285 19 07 05.701 -20 01 14.12 25.9r 20KU55 266 C~6c5c 2020 08 14.42134 19 07 05.370 -20 01 14.91 25.9r 20KU55 266 C~6c5c
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 -4.72 0.02 0.11 -0.01
3 0.0005 -9.30 0.03 0.23 -0.01
4 0.0055 -102.76 -0.02 2.20 0.00
5 0.0056 -104.93 -0.03 2.24 0.00
6 0.0059 -112.03 -0.03 2.40 0.01
7 0.0603 -1288.82 0.04 12.85 0.04
8 0.0605 -1294.09 0.03 12.86 0.04
9 0.0607 -1299.27 0.04 12.90 0.04
10 0.0684 -1483.72 -0.03 12.48 -0.03
11 0.0687 -1489.06 -0.03 12.48 -0.02
12 0.0689 -1494.41 -0.03 12.49 -0.03
13 0.2021 -4634.10 0.02 -66.87 0.00
14 0.2024 -4638.60 0.02 -67.11 0.00
15 0.2026 -4643.07 0.02 -67.33 -0.00
16 0.2075 -4739.34 -0.02 -72.86 -0.01
17 0.2078 -4744.16 -0.02 -73.13 -0.01
18 0.2080 -4748.89 -0.02 -73.37 0.00
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.
20KU55 quality flag:1 Type: CLASSICAL CLASSICAL SCATNEAR axisobj 44.349 51.088 41.181 ecceobj 0.001 0.207 0.152 incobj 5.491 5.219 5.785 qmin 43.670 39.990 34.607 qmax 45.617 63.420 48.256 amean 44.578 51.446 41.215 amin 44.235 50.985 40.747 amax 44.919 51.991 41.694 emean 0.007 0.209 0.128 emin 0.000 0.198 0.098 emax 0.016 0.220 0.159 imean 4.335 3.998 5.422 imin 3.875 3.702 0.931 imax 4.860 4.285 9.942 excite_mean 0.076 0.221 0.164 fracstop 1.000 1.000 1.000 cjmean 3.102 3.135 3.040 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 178.0 182.9 186.9 kozaiamp 180.0 180.0 180.0