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: 21LS44
# Created Sun Apr 27 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting 21 observations of 21
# Arc: 1.37y
# First observation: 2021/06/09
# Last observation: 2022/10/23
Preliminary a, adot, b, bdot, g, gdot:
0.000019 0.021909 -0.000004 -0.000698 0.023178 0.000000
# Chi-squared of fit: 1.29 DOF: 36 RMS: 0.04
# Min/Max residuals: -0.10 0.07
# Exact a, adot, b, bdot, g, gdot:
1.486443E-05 2.195094E-02 -3.558794E-07 -7.161875E-04 2.328810E-02 2.837295E-04
# Covariance matrix:
2.7833E-13 8.3361E-14 2.1225E-15 -1.7593E-14 3.2458E-13 1.6046E-11
8.3361E-14 8.3998E-13 5.8500E-15 -4.8562E-14 8.2791E-13 4.3790E-11
2.1225E-15 5.8500E-15 1.8427E-13 -1.5744E-13 7.2966E-15 4.9094E-13
-1.7593E-14 -4.8562E-14 -1.5744E-13 2.2203E-13 -6.0477E-14 -4.0908E-12
3.2458E-13 8.2791E-13 7.2966E-15 -6.0477E-14 1.1193E-12 5.5183E-11
1.6046E-11 4.3790E-11 4.9094E-13 -4.0908E-12 5.5183E-11 3.5818E-09
# lat0 lon0 xBary yBary zBary JD0
1.168233 -73.278263 0.485534 0.017886 -0.887645 2459374.942811
# Heliocentric elements and errors
Epoch: 2459370.5000 = 2021/06/05
Mean Anomaly: 180.36767 +/- 23.523
Argument of Peri: 327.90568 +/- 23.523
Long of Asc Node: 137.79345 +/- 0.016
Inclination: 2.17722 +/- 0.001
Eccentricity: 0.00657243 +/- 0.0001
Semi-Major Axis: 43.55137073 +/- 0.0035
Time of Perihelion: 2511752.6332 +/- 6859.3
Perihelion: 43.26513218 +/- 0.0044
Aphelion: 43.83760927 +/- 0.0045
Period (y) 287.4160 +/- 0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 12.15110827 +/- 0.0005
Ecliptic Y -42.11079957 +/- 0.0019
Ecliptic Z 0.87553452 +/- 0.0000
Ecliptic XDOT 0.00248718 +/- 0.0000
Ecliptic YDOT 0.00071606 +/- 0.0000
Ecliptic ZDOT -0.00008369 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 43.83760296 +/- 0.0018
Geocenter to KBO 42.94038274 +/- 0.0020
# Hcoef: 8.40
The following table shows the complete astrometric record for 21LS44. 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 (21LS44) followed by the observatory code and reference code for the source of the astrometry.
2021 06 09.44201 19 11 54.196 -21 14 01.04 25.4r 21LS44 266 C~6Ip3 2021 06 09.52741 19 11 53.831 -21 14 01.64 25.4r 21LS44 266 C~6Ip3 2021 06 09.61426 19 11 53.459 -21 14 02.22 25.4r 21LS44 266 C~6Ip3 2021 06 17.43605 19 11 19.260 -21 14 58.84 25.3r 21LS44 266 C~6Ip3 2021 06 17.50053 19 11 18.963 -21 14 59.33 25.3r 21LS44 266 C~6Ip3 2021 06 17.57953 19 11 18.598 -21 14 59.92 25.3r 21LS44 266 C~6Ip3 2021 09 06.23258 19 05 44.452 -21 25 23.89 25.5r 21LS44 266 C~6Ip3 2021 09 06.31281 19 05 44.277 -21 25 24.30 25.5r 21LS44 266 C~6Ip3 2021 09 06.39352 19 05 44.104 -21 25 24.70 25.5r 21LS44 266 C~6Ip3 2022 06 29.45229 19 15 48.124 -21 09 32.58 24.6r 21LS44 266 C~7um8 2022 06 29.51531 19 15 47.816 -21 09 33.14 24.6r 21LS44 266 C~7um8 2022 06 29.57696 19 15 47.515 -21 09 33.67 24.6r 21LS44 266 C~7um8 2022 06 30.45132 19 15 43.330 -21 09 41.59 24.9r 21LS44 266 C~7um8 2022 06 30.51472 19 15 43.019 -21 09 42.15 24.9r 21LS44 266 C~7um8 2022 06 30.57688 19 15 42.715 -21 09 42.70 24.9r 21LS44 266 C~7um8 2022 10 20.21696 19 10 58.885 -21 20 35.99 24.1V 21LS44 266 C~7um8 2022 10 20.26058 19 10 58.968 -21 20 35.91 24.1V 21LS44 266 C~7um8 2022 10 20.29842 19 10 59.040 -21 20 35.85 24.1V 21LS44 266 C~7um8 2022 10 23.20599 19 11 05.182 -21 20 30.88 23.9V 21LS44 266 C~7um8 2022 10 23.25093 19 11 05.281 -21 20 30.78 23.9V 21LS44 266 C~7um8 2022 10 23.29489 19 11 05.377 -21 20 30.68 23.9V 21LS44 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 0.01 0.00 -0.03
2 0.0002 -5.14 0.02 0.03 -0.03
3 0.0005 -10.37 0.02 0.09 -0.03
4 0.0219 -491.84 -0.02 2.38 0.04
5 0.0221 -496.02 -0.01 2.40 0.04
6 0.0223 -501.16 -0.02 2.44 0.04
7 0.2431 -5211.87 0.02 -68.79 0.00
8 0.2433 -5214.35 -0.00 -68.92 0.00
9 0.2435 -5216.79 -0.01 -69.05 -0.00
10 1.0541 3279.58 -0.06 -145.37 0.05
11 1.0543 3275.23 -0.06 -145.37 0.04
12 1.0544 3270.99 -0.06 -145.36 0.05
13 1.0568 3211.90 0.07 -145.67 -0.10
14 1.0570 3207.51 0.07 -145.66 -0.10
15 1.0572 3203.22 0.07 -145.66 -0.10
16 1.3628 -815.48 0.02 -297.64 -0.00
17 1.3630 -814.32 0.03 -297.70 0.01
18 1.3631 -813.32 0.03 -297.76 -0.00
19 1.3710 -727.54 -0.04 -303.25 0.04
20 1.3711 -726.15 -0.02 -303.32 0.04
21 1.3713 -724.81 -0.03 -303.38 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.
21LS44 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.070 43.092 43.051 ecceobj 0.016 0.016 0.019 incobj 2.178 2.178 2.178 qmin 41.387 41.499 41.243 qmax 45.368 45.323 45.474 amean 43.295 43.319 43.274 amin 42.956 42.989 42.945 amax 43.642 43.655 43.618 emean 0.024 0.022 0.027 emin 0.004 0.003 0.007 emax 0.040 0.039 0.043 imean 1.994 1.969 2.022 imin 1.096 1.088 1.096 imax 2.694 2.669 2.721 excite_mean 0.042 0.041 0.045 fracstop 1.000 1.000 1.000 cjmean 3.091 3.091 3.090 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 186.1 182.7 188.0 kozaiamp 180.0 180.0 180.0