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: 21LO44
# Created Sun Dec 22 02:11:18 2024
# Orbit generated from Bernstein formalism
# Fitting 21 observations of 21
# Arc: 1.28y
# First observation: 2020/05/26
# Last observation: 2021/09/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000006 0.029827 -0.000008 -0.009985 0.029007 0.000000
# Chi-squared of fit: 0.27 DOF: 36 RMS: 0.02
# Min/Max residuals: -0.03 0.04
# Exact a, adot, b, bdot, g, gdot:
1.621121E-05 2.992437E-02 -5.613309E-06 -1.006366E-02 2.915991E-02 7.908193E-03
# Covariance matrix:
2.1557E-13 1.6004E-12 9.7641E-15 -6.5546E-13 1.7681E-12 5.6957E-11
1.6004E-12 5.9669E-11 3.2863E-13 -2.2138E-11 6.0467E-11 1.9237E-09
9.7641E-15 3.2863E-13 1.6528E-13 -2.6864E-13 3.3323E-13 1.0696E-11
-6.5546E-13 -2.2138E-11 -2.6864E-13 8.5052E-12 -2.2470E-11 -7.1929E-10
1.7681E-12 6.0467E-11 3.3323E-13 -2.2470E-11 6.1588E-11 1.9525E-09
5.6957E-11 1.9237E-09 1.0696E-11 -7.1929E-10 1.9525E-09 6.2502E-08
# lat0 lon0 xBary yBary zBary JD0
2.103428 -74.248367 0.659381 0.027900 -0.763120 2458995.943811
# Heliocentric elements and errors
Epoch: 2458990.5000 = 2020/05/21
Mean Anomaly: 50.47161 +/- 0.338
Argument of Peri: 96.47244 +/- 0.423
Long of Asc Node: 110.83419 +/- 0.001
Inclination: 18.51700 +/- 0.003
Eccentricity: 0.25022758 +/- 0.0080
Semi-Major Axis: 39.51337118 +/- 0.1581
Time of Perihelion: 2446271.3179 +/- 37.8
Perihelion: 29.62603600 +/- 0.3371
Aphelion: 49.40070635 +/- 0.3724
Period (y) 248.3844 +/- 1.49
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 8.88157733 +/- 0.0025
Ecliptic Y -33.90446330 +/- 0.0089
Ecliptic Z 1.25857544 +/- 0.0003
Ecliptic XDOT 0.00292309 +/- 0.0000
Ecliptic YDOT 0.00001871 +/- 0.0000
Ecliptic ZDOT -0.00091723 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 35.07105729 +/- 0.0086
Geocenter to KBO 34.29366274 +/- 0.0092
# Hcoef: 9.59
The following table shows the complete astrometric record for 21LO44. 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 (21LO44) followed by the observatory code and reference code for the source of the astrometry.
2020 05 26.44301 19 07 18.387 -20 25 13.69 25.3r 21LO44 266 C~7um8 2020 05 26.50149 19 07 18.135 -20 25 14.30 25.3r 21LO44 266 C~7um8 2020 05 26.55599 19 07 17.898 -20 25 14.86 25.3r 21LO44 266 C~7um8 2020 05 29.44698 19 07 05.329 -20 25 45.00 24.6r 21LO44 266 C~7um8 2020 05 29.53371 19 07 04.933 -20 25 45.94 24.6r 21LO44 266 C~7um8 2020 05 29.61905 19 07 04.542 -20 25 46.85 24.6r 21LO44 266 C~7um8 2020 05 31.44139 19 06 56.280 -20 26 06.57 24.7r 21LO44 266 C~7um8 2020 05 31.53101 19 06 55.857 -20 26 07.57 24.7r 21LO44 266 C~7um8 2020 05 31.61814 19 06 55.446 -20 26 08.52 24.7r 21LO44 266 C~7um8 2021 06 09.44201 19 13 47.593 -20 49 43.95 25.3r 21LO44 266 C~6Ip3 2021 06 09.52601 19 13 47.160 -20 49 45.08 25.3r 21LO44 266 C~6Ip3 2021 06 09.61426 19 13 46.705 -20 49 46.24 25.3r 21LO44 266 C~6Ip3 2021 06 17.43605 19 13 05.427 -20 51 34.91 25.1r 21LO44 266 C~6Ip3 2021 06 17.50053 19 13 05.068 -20 51 35.84 25.1r 21LO44 266 C~6Ip3 2021 06 17.57953 19 13 04.627 -20 51 36.96 25.1r 21LO44 266 C~6Ip3 2021 07 05.35106 19 11 22.167 -20 56 06.38 24.7r 21LO44 266 C~6Ip3 2021 07 05.43951 19 11 21.632 -20 56 07.79 24.7r 21LO44 266 C~6Ip3 2021 07 05.52517 19 11 21.114 -20 56 09.13 24.7r 21LO44 266 C~6Ip3 2021 09 06.23258 19 06 19.915 -21 11 32.15 25.3r 21LO44 266 C~6Ip3 2021 09 06.31281 19 06 19.710 -21 11 33.07 25.3r 21LO44 266 C~6Ip3 2021 09 06.39352 19 06 19.505 -21 11 33.98 25.3r 21LO44 266 C~6Ip3
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 0.00 0.00 0.03
2 0.0002 -3.59 0.01 -0.20 0.03
3 0.0003 -6.96 0.01 -0.37 0.03
4 0.0082 -185.94 -0.02 -9.98 -0.03
5 0.0085 -191.58 -0.02 -10.28 -0.03
6 0.0087 -197.14 -0.02 -10.55 -0.03
7 0.0137 -314.77 0.01 -16.81 -0.00
8 0.0139 -320.79 0.01 -17.12 -0.00
9 0.0142 -326.64 0.02 -17.40 -0.00
10 1.0376 5248.95 0.01 -2116.66 0.04
11 1.0379 5242.78 0.01 -2117.02 0.04
12 1.0381 5236.30 0.02 -2117.37 0.04
13 1.0595 4648.26 -0.03 -2153.05 -0.03
14 1.0597 4643.15 -0.01 -2153.35 -0.03
15 1.0599 4636.87 -0.01 -2153.69 -0.03
16 1.1086 3178.26 0.00 -2244.72 -0.01
17 1.1088 3170.64 0.00 -2245.21 -0.02
18 1.1091 3163.27 0.01 -2245.66 -0.02
19 1.2807 -1132.64 0.00 -2666.51 0.00
20 1.2810 -1135.59 0.00 -2667.10 0.01
21 1.2812 -1138.54 -0.01 -2667.68 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.
21LO44 quality flag:2 Type: 3:2E CENTAURR CENTAURR axisobj 38.937 39.535 38.386 ecceobj 0.244 0.263 0.224 incobj 18.577 18.567 18.586 qmin 29.077 28.630 28.773 qmax 50.615 50.988 57.662 amean 39.456 39.136 40.875 amin 38.911 37.905 37.862 amax 40.092 40.116 44.021 emean 0.236 0.237 0.253 emin 0.200 0.197 0.169 emax 0.264 0.273 0.318 imean 17.833 17.904 13.898 imin 16.834 16.829 11.461 imax 19.124 18.781 18.157 excite_mean 0.387 0.389 0.350 fracstop 1.000 0.018 0.590 cjmean 2.881 2.877 2.921 libcent 0 178.7 -180.0 -180.0 libamp 0 138.1 -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 234.5 123.7 180.3 kozaiamp 107.7 26.7 180.0