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: 21LW44
# Created Tue Apr 1 01:11:25 2025
# Orbit generated from Bernstein formalism
# Fitting 18 observations of 18
# Arc: 1.37y
# First observation: 2021/06/09
# Last observation: 2022/10/23
Preliminary a, adot, b, bdot, g, gdot:
-0.000010 0.020623 -0.000001 -0.000692 0.022377 0.000000
# Chi-squared of fit: 0.03 DOF: 30 RMS: 0.01
# Min/Max residuals: -0.01 0.02
# Exact a, adot, b, bdot, g, gdot:
1.454567E-05 2.071581E-02 -4.782136E-07 -7.154448E-04 2.253952E-02 -9.358220E-04
# Covariance matrix:
3.7407E-13 2.5967E-13 4.1320E-14 -6.0982E-13 2.1619E-12 4.0056E-10
2.5967E-13 1.0717E-12 8.3600E-14 -1.2321E-12 4.4376E-12 8.1012E-10
4.1320E-14 8.3600E-14 2.0254E-13 -3.8737E-13 7.6547E-13 1.5887E-10
-6.0982E-13 -1.2321E-12 -3.8737E-13 3.8323E-12 -1.1393E-11 -2.3679E-09
2.1619E-12 4.4376E-12 7.6547E-13 -1.1393E-11 3.6470E-11 7.4384E-09
4.0056E-10 8.1012E-10 1.5887E-10 -2.3679E-09 7.4384E-09 1.5444E-06
# lat0 lon0 xBary yBary zBary JD0
1.450144 -73.165250 0.487285 0.022229 -0.886587 2459374.942811
# Heliocentric elements and errors
Epoch: 2459370.5000 = 2021/06/05
Mean Anomaly: 251.98794 +/- 22.625
Argument of Peri: 258.61163 +/- 22.035
Long of Asc Node: 142.15272 +/- 0.035
Inclination: 2.42172 +/- 0.002
Eccentricity: 0.06181680 +/- 0.0532
Semi-Major Axis: 44.26869406 +/- 0.2798
Time of Perihelion: 2491648.9923 +/- 6754.3
Perihelion: 41.53214523 +/- 2.3707
Aphelion: 47.00524288 +/- 2.3748
Period (y) 294.5461 +/- 2.79
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 12.64368386 +/- 0.0034
Ecliptic Y -43.44630559 +/- 0.0114
Ecliptic Z 1.12284272 +/- 0.0003
Ecliptic XDOT 0.00238179 +/- 0.0000
Ecliptic YDOT 0.00084255 +/- 0.0001
Ecliptic ZDOT -0.00008994 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 45.26262240 +/- 0.0110
Geocenter to KBO 44.36651180 +/- 0.0119
# Hcoef: 7.58
The following table shows the complete astrometric record for 21LW44. 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 (21LW44) followed by the observatory code and reference code for the source of the astrometry.
2021 06 09.44201 19 12 14.113 -20 56 23.82 24.9r 21LW44 266 C~6Ip3 2021 06 09.52601 19 12 13.764 -20 56 24.38 24.9r 21LW44 266 C~6Ip3 2021 06 09.61426 19 12 13.398 -20 56 24.94 24.9r 21LW44 266 C~6Ip3 2021 06 17.43605 19 11 40.229 -20 57 19.10 24.7r 21LW44 266 C~6Ip3 2021 06 17.50053 19 11 39.940 -20 57 19.58 24.7r 21LW44 266 C~6Ip3 2021 06 17.57953 19 11 39.587 -20 57 20.14 24.7r 21LW44 266 C~6Ip3 2021 09 06.23258 19 06 14.765 -21 07 41.01 25.1r 21LW44 266 C~6Ip3 2021 09 06.31281 19 06 14.595 -21 07 41.44 25.1r 21LW44 266 C~6Ip3 2021 09 06.39352 19 06 14.426 -21 07 41.85 25.1r 21LW44 266 C~6Ip3 2022 10 20.21696 19 11 09.832 -21 03 35.64 23.6V 21LW44 266 C~7um8 2022 10 20.26058 19 11 09.911 -21 03 35.59 23.6V 21LW44 266 C~7um8 2022 10 20.29842 19 11 09.980 -21 03 35.54 23.6V 21LW44 266 C~7um8 2022 10 21.20926 19 11 11.741 -21 03 34.61 23.4V 21LW44 266 C~7um8 2022 10 21.25420 19 11 11.826 -21 03 34.55 23.4V 21LW44 266 C~7um8 2022 10 21.29846 19 11 11.911 -21 03 34.48 23.4V 21LW44 266 C~7um8 2022 10 23.20599 19 11 15.860 -21 03 32.00 23.5V 21LW44 266 C~7um8 2022 10 23.25093 19 11 15.954 -21 03 31.92 23.5V 21LW44 266 C~7um8 2022 10 23.29489 19 11 16.046 -21 03 31.84 23.5V 21LW44 266 C~7um8
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 -0.00
2 0.0002 -4.92 -0.01 0.05 -0.01
3 0.0005 -10.08 0.00 0.12 -0.01
4 0.0219 -477.86 0.01 3.48 0.01
5 0.0221 -481.94 -0.00 3.50 0.00
6 0.0223 -486.92 0.00 3.55 0.01
7 0.2431 -5076.87 -0.00 -75.23 -0.00
8 0.2433 -5079.29 -0.00 -75.39 -0.00
9 0.2435 -5081.68 0.01 -75.53 -0.00
10 1.3628 -946.30 0.00 -318.28 0.02
11 1.3630 -945.20 0.01 -318.37 0.01
12 1.3631 -944.24 0.00 -318.44 0.01
13 1.3656 -919.65 0.00 -320.51 -0.00
14 1.3657 -918.47 -0.01 -320.60 -0.00
15 1.3658 -917.28 -0.00 -320.67 0.00
16 1.3710 -862.11 -0.00 -324.94 -0.01
17 1.3711 -860.79 0.00 -325.02 -0.01
18 1.3713 -859.50 -0.01 -325.10 -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.
21LW44 quality flag:2 Type: CLASSICAL SCATNEAR CLASSICAL axisobj 43.795 45.135 43.758 ecceobj 0.068 0.212 0.047 incobj 2.423 2.417 2.424 qmin 39.920 31.721 40.880 qmax 48.281 61.749 47.309 amean 44.008 45.699 43.973 amin 43.656 44.394 43.633 amax 44.380 47.509 44.341 emean 0.073 0.264 0.051 emin 0.056 0.200 0.035 emax 0.089 0.311 0.067 imean 2.178 8.059 2.072 imin 1.389 1.318 1.391 imax 2.881 13.488 2.713 excite_mean 0.082 0.304 0.063 fracstop 1.000 1.000 1.000 cjmean 3.093 3.004 3.096 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 188.6 180.6 192.7 kozaiamp 179.9 180.0 179.9