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: 21LW43
# Created Mon Apr 28 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting 18 observations of 18
# Arc: 1.37y
# First observation: 2021/06/09
# Last observation: 2022/10/21
Preliminary a, adot, b, bdot, g, gdot:
-0.000032 0.022852 0.000015 0.009994 0.023101 0.000000
# Chi-squared of fit: 0.55 DOF: 30 RMS: 0.03
# Min/Max residuals: -0.06 0.06
# Exact a, adot, b, bdot, g, gdot:
1.560532E-05 2.297287E-02 6.654406E-06 1.023485E-02 2.327827E-02 -5.784628E-04
# Covariance matrix:
2.5121E-13 2.1273E-13 -4.4724E-14 6.8206E-13 4.9140E-13 4.8590E-11
2.1273E-13 1.2614E-12 -1.9707E-13 3.0033E-12 1.6991E-12 2.1475E-10
-4.4724E-14 -1.9707E-13 2.0824E-13 -1.1655E-12 -4.0334E-13 -7.5598E-11
6.8206E-13 3.0033E-12 -1.1655E-12 1.6254E-11 6.1443E-12 1.1511E-09
4.9140E-13 1.6991E-12 -4.0334E-13 6.1443E-12 2.9920E-12 4.4020E-10
4.8590E-11 2.1475E-10 -7.5598E-11 1.1511E-09 4.4020E-10 8.2673E-08
# lat0 lon0 xBary yBary zBary JD0
0.925181 -72.886190 0.491598 0.014067 -0.884370 2459374.942811
# Heliocentric elements and errors
Epoch: 2459370.5000 = 2021/06/05
Mean Anomaly: 355.63761 +/- 1.395
Argument of Peri: 10.80320 +/- 2.766
Long of Asc Node: 284.44141 +/- 0.000
Inclination: 23.98708 +/- 0.005
Eccentricity: 0.30515411 +/- 0.0019
Semi-Major Axis: 62.94637073 +/- 0.0725
Time of Perihelion: 2461580.9279 +/- 707.1
Perihelion: 43.73802714 +/- 0.1315
Aphelion: 82.15471432 +/- 0.1540
Period (y) 499.4181 +/- 0.86
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 12.43851417 +/- 0.0009
Ecliptic Y -42.04579850 +/- 0.0031
Ecliptic Z 0.69400316 +/- 0.0001
Ecliptic XDOT 0.00256213 +/- 0.0000
Ecliptic YDOT 0.00088582 +/- 0.0000
Ecliptic ZDOT 0.00120232 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 43.85256488 +/- 0.0029
Geocenter to KBO 42.95851390 +/- 0.0032
# Hcoef: 9.84
The following table shows the complete astrometric record for 21LW43. 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 (21LW43) followed by the observatory code and reference code for the source of the astrometry.
2021 06 09.44201 19 13 42.195 -21 25 33.88 26.2r 21LW43 266 C~6Ip2 2021 06 09.52601 19 13 41.836 -21 25 33.97 26.2r 21LW43 266 C~6Ip2 2021 06 09.61426 19 13 41.459 -21 25 34.04 26.2r 21LW43 266 C~6Ip2 2021 06 17.43605 19 13 07.273 -21 25 44.42 26.1r 21LW43 266 C~6Ip2 2021 06 17.50053 19 13 06.975 -21 25 44.52 26.1r 21LW43 266 C~6Ip2 2021 06 17.57953 19 13 06.610 -21 25 44.64 26.1r 21LW43 266 C~6Ip2 2021 07 05.35106 19 11 42.008 -21 26 23.00 25.8r 21LW43 266 C~6Ip2 2021 07 05.43951 19 11 41.567 -21 26 23.23 25.8r 21LW43 266 C~6Ip2 2021 07 05.52517 19 11 41.139 -21 26 23.44 25.8r 21LW43 266 C~6Ip2 2021 09 06.23258 19 07 30.377 -21 27 58.63 26.6r 21LW43 266 C~6Ip2 2021 09 06.31281 19 07 30.203 -21 27 58.54 26.6r 21LW43 266 C~6Ip2 2021 09 06.39352 19 07 30.029 -21 27 58.44 26.6r 21LW43 266 C~6Ip2 2022 10 20.21696 19 12 37.642 -20 41 34.40 21LW43 266 C~8ebm 2022 10 20.26058 19 12 37.722 -20 41 34.10 21LW43 266 C~8ebm 2022 10 20.29842 19 12 37.793 -20 41 33.83 21LW43 266 C~8ebm 2022 10 21.20926 19 12 39.581 -20 41 27.66 21LW43 266 C~8ebm 2022 10 21.25420 19 12 39.668 -20 41 27.34 21LW43 266 C~8ebm 2022 10 21.29846 19 12 39.754 -20 41 27.02 21LW43 266 C~8ebm
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 0.06
2 0.0002 -4.98 0.00 0.54 0.06
3 0.0005 -10.22 0.01 1.13 0.06
4 0.0219 -485.10 -0.02 50.63 -0.04
5 0.0221 -489.24 -0.02 51.05 -0.02
6 0.0223 -494.32 -0.03 51.57 -0.02
7 0.0709 -1671.28 0.02 159.62 -0.06
8 0.0712 -1677.42 0.03 160.15 -0.06
9 0.0714 -1683.38 0.02 160.67 -0.06
10 0.2431 -5171.63 -0.05 483.71 0.03
11 0.2433 -5174.03 -0.00 484.08 0.03
12 0.2435 -5176.44 0.03 484.46 0.03
13 1.3628 -566.89 -0.00 2731.84 -0.01
14 1.3630 -565.74 -0.01 2732.00 -0.01
15 1.3631 -564.72 0.01 2732.14 -0.01
16 1.3656 -539.06 -0.00 2735.15 0.01
17 1.3657 -537.81 0.00 2735.32 0.01
18 1.3658 -536.57 -0.00 2735.49 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.
21LW43 quality flag:2 Type: SCATNEAR 3:1II SCATNEAR axisobj 61.935 62.239 61.825 ecceobj 0.295 0.298 0.296 incobj 24.075 24.091 24.061 qmin 42.150 43.354 42.229 qmax 83.417 82.981 83.064 amean 62.334 62.630 62.194 amin 61.650 62.006 61.541 amax 63.184 63.402 63.005 emean 0.305 0.214 0.303 emin 0.289 0.162 0.290 emax 0.322 0.309 0.319 imean 25.341 28.187 25.404 imin 24.895 25.552 25.021 imax 25.826 29.359 25.836 excite_mean 0.525 0.520 0.525 fracstop 1.000 1.000 1.000 cjmean 2.959 2.961 2.957 libcent 0 -180.0 198.6 -180.0 libamp 0 -180.0 103.1 -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 168.2 149.3 179.4 kozaiamp 179.9 180.0 180.0