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: 20KY55
# Created Mon Apr 28 01:11:21 2025
# Orbit generated from Bernstein formalism
# Fitting 21 observations of 21
# Arc: 78.97d
# First observation: 2020/05/28
# Last observation: 2020/08/15
Preliminary a, adot, b, bdot, g, gdot:
0.000001 0.020942 0.000006 0.001327 0.024831 0.000000
# Chi-squared of fit: 0.34 DOF: 36 RMS: 0.02
# Min/Max residuals: -0.04 0.04
# Exact a, adot, b, bdot, g, gdot:
1.691616E-05 2.800678E-02 7.778053E-07 1.326191E-03 2.603635E-02 2.480517E-03
# Covariance matrix:
2.7426E-13 2.8577E-11 -2.6475E-14 8.9440E-14 6.3404E-12 2.5700E-10
2.8577E-11 1.2603E-07 -9.7428E-11 1.3385E-10 2.3674E-08 3.9320E-07
-2.6475E-14 -9.7428E-11 2.3122E-13 -1.0531E-12 -1.8329E-11 -3.0937E-10
8.9440E-14 1.3385E-10 -1.0531E-12 1.0593E-11 2.5559E-11 5.0347E-10
6.3404E-12 2.3674E-08 -1.8329E-11 2.5559E-11 4.4531E-09 7.5039E-08
2.5700E-10 3.9320E-07 -3.0937E-10 5.0347E-10 7.5039E-08 1.4705E-06
# lat0 lon0 xBary yBary zBary JD0
2.136007 -72.478991 0.657282 0.028406 -0.765035 2458997.947541
# Heliocentric elements and errors
Epoch: 2458990.5000 = 2020/05/21
Mean Anomaly: 18.68960 +/- 7.198
Argument of Peri: 10.33992 +/- 10.996
Long of Asc Node: 249.14895 +/- 0.345
Inclination: 3.44329 +/- 0.027
Eccentricity: 0.18101161 +/- 0.0415
Semi-Major Axis: 47.04091740 +/- 1.4928
Time of Perihelion: 2452872.4976 +/- 2338.2
Perihelion: 38.52596542 +/- 2.3051
Aphelion: 55.55586937 +/- 2.6319
Period (y) 322.6427 +/- 15.36
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 11.16418527 +/- 0.0296
Ecliptic Y -37.53528834 +/- 0.0938
Ecliptic Z 1.43162668 +/- 0.0037
Ecliptic XDOT 0.00289345 +/- 0.0001
Ecliptic YDOT 0.00064655 +/- 0.0001
Ecliptic ZDOT 0.00014885 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 39.18655967 +/- 0.0903
Geocenter to KBO 38.40784394 +/- 0.0984
# Hcoef: 10.01
The following table shows the complete astrometric record for 20KY55. 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 (20KY55) followed by the observatory code and reference code for the source of the astrometry.
2020 05 28.44674 19 14 46.484 -20 10 24.41 26.0r 20KY55 266 C~6c5c 2020 05 28.50129 19 14 46.273 -20 10 24.63 26.0r 20KY55 266 C~6c5c 2020 05 28.55756 19 14 46.055 -20 10 24.85 26.0r 20KY55 266 C~6c5c 2020 05 30.43935 19 14 38.825 -20 10 32.41 26.3r 20KY55 266 C~6c5c 2020 05 30.53044 19 14 38.460 -20 10 32.81 26.3r 20KY55 266 C~6c5c 2020 05 30.61862 19 14 38.106 -20 10 33.17 26.3r 20KY55 266 C~6c5c 2020 06 20.45583 19 13 03.776 -20 12 32.30 26.1r 20KY55 266 C~6c5c 2020 06 20.52860 19 13 03.404 -20 12 32.81 26.1r 20KY55 266 C~6c5c 2020 06 20.62233 19 13 02.926 -20 12 33.45 26.1r 20KY55 266 C~6c5c 2020 06 22.44948 19 12 53.714 -20 12 46.51 25.6r 20KY55 266 C~6c5c 2020 06 22.52092 19 12 53.344 -20 12 47.03 25.6r 20KY55 266 C~6c5c 2020 06 22.59118 19 12 52.981 -20 12 47.52 25.6r 20KY55 266 C~6c5c 2020 06 25.44823 19 12 38.346 -20 13 08.70 25.9r 20KY55 266 C~6c5c 2020 06 25.53213 19 12 37.904 -20 13 09.32 25.9r 20KY55 266 C~6c5c 2020 06 25.61487 19 12 37.471 -20 13 09.93 25.9r 20KY55 266 C~6c5c 2020 08 13.24332 19 08 33.607 -20 20 01.28 25.9r 20KY55 266 C~6c5c 2020 08 13.33331 19 08 33.227 -20 20 02.02 25.9r 20KY55 266 C~6c5c 2020 08 13.42301 19 08 32.849 -20 20 02.73 25.9r 20KY55 266 C~6c5c 2020 08 15.24331 19 08 25.466 -20 20 17.40 25.3r 20KY55 266 C~6c5c 2020 08 15.33985 19 08 25.071 -20 20 18.18 25.3r 20KY55 266 C~6c5c 2020 08 15.42111 19 08 24.739 -20 20 18.81 25.3r 20KY55 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 0.01
2 0.0001 -2.97 0.01 0.16 0.01
3 0.0003 -6.05 0.01 0.33 0.01
4 0.0055 -107.98 -0.02 5.81 -0.01
5 0.0057 -113.12 -0.02 6.07 -0.01
6 0.0059 -118.11 -0.02 6.35 -0.01
7 0.0630 -1450.54 -0.00 55.76 -0.02
8 0.0632 -1455.80 -0.00 55.91 -0.02
9 0.0635 -1462.56 -0.00 56.11 -0.02
10 0.0685 -1592.85 0.04 59.35 0.01
11 0.0686 -1598.08 0.03 59.49 0.01
12 0.0688 -1603.21 0.04 59.64 0.01
13 0.0767 -1810.26 -0.03 64.28 0.01
14 0.0769 -1816.51 -0.04 64.44 0.02
15 0.0771 -1822.64 -0.03 64.59 0.01
16 0.2103 -5279.58 0.02 72.57 0.04
17 0.2105 -5284.97 0.02 72.47 0.04
18 0.2107 -5290.34 0.02 72.39 0.04
19 0.2157 -5395.26 -0.02 70.09 -0.04
20 0.2160 -5400.87 -0.02 69.98 -0.04
21 0.2162 -5405.59 -0.02 69.90 -0.04
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.
20KY55 quality flag:1 Type: CLASSICAL SCATNEAR CLASSICAL axisobj 46.311 54.005 41.906 ecceobj 0.169 0.326 0.058 incobj 3.464 3.376 3.563 qmin 37.858 35.813 35.977 qmax 55.684 74.092 48.735 amean 46.590 54.354 42.134 amin 46.188 53.635 41.772 amax 47.056 55.237 42.543 emean 0.170 0.328 0.091 emin 0.156 0.314 0.042 emax 0.184 0.341 0.146 imean 5.208 4.941 5.906 imin 4.526 4.238 3.447 imax 5.876 5.545 7.783 excite_mean 0.193 0.339 0.138 fracstop 1.000 1.000 1.000 cjmean 3.087 3.083 3.055 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 172.3 178.9 178.0 kozaiamp 180.0 180.0 180.0