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: 21LY44
# 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: 2022/10/23
Preliminary a, adot, b, bdot, g, gdot:
-0.000012 0.022283 -0.000004 -0.001461 0.022579 0.000000
# Chi-squared of fit: 0.28 DOF: 30 RMS: 0.02
# Min/Max residuals: -0.03 0.06
# Exact a, adot, b, bdot, g, gdot:
1.563057E-05 2.244412E-02 -1.171047E-06 -1.527212E-03 2.279621E-02 7.824929E-03
# Covariance matrix:
3.4551E-13 9.1193E-13 5.1219E-14 -7.6544E-13 1.7494E-12 2.8916E-10
9.1193E-13 1.0525E-11 5.8534E-13 -8.8057E-12 1.7906E-11 3.3114E-09
5.1219E-14 5.8534E-13 2.2112E-13 -6.6661E-13 1.0296E-12 1.9626E-10
-7.6544E-13 -8.8057E-12 -6.6661E-13 8.0776E-12 -1.5498E-11 -2.9574E-09
1.7494E-12 1.7906E-11 1.0296E-12 -1.5498E-11 3.1201E-11 5.8259E-09
2.8916E-10 3.3114E-09 1.9626E-10 -2.9574E-09 5.8259E-09 1.1109E-06
# lat0 lon0 xBary yBary zBary JD0
1.521864 -73.226871 0.486331 0.023353 -0.887082 2459374.942811
# Heliocentric elements and errors
Epoch: 2459370.5000 = 2021/06/05
Mean Anomaly: 34.09117 +/- 2.415
Argument of Peri: 86.39413 +/- 2.205
Long of Asc Node: 127.33980 +/- 0.017
Inclination: 4.12153 +/- 0.003
Eccentricity: 0.39084492 +/- 0.0498
Semi-Major Axis: 59.08716445 +/- 2.7331
Time of Perihelion: 2443660.4511 +/- 224.4
Perihelion: 35.99324642 +/- 3.3798
Aphelion: 82.18108249 +/- 4.8064
Period (y) 454.2008 +/- 31.51
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 12.45352915 +/- 0.0031
Ecliptic Y -42.98056495 +/- 0.0103
Ecliptic Z 1.16506225 +/- 0.0003
Ecliptic XDOT 0.00285897 +/- 0.0000
Ecliptic YDOT -0.00011913 +/- 0.0001
Ecliptic ZDOT -0.00015858 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 44.76356466 +/- 0.0099
Geocenter to KBO 43.86694757 +/- 0.0107
# Hcoef: 8.47
The following table shows the complete astrometric record for 21LY44. 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 (21LY44) followed by the observatory code and reference code for the source of the astrometry.
2021 06 09.44201 19 11 56.139 -20 52 34.89 25.5r 21LY44 266 C~6Ip3 2021 06 09.52601 19 11 55.791 -20 52 35.48 25.5r 21LY44 266 C~6Ip3 2021 06 09.61426 19 11 55.426 -20 52 36.08 25.5r 21LY44 266 C~6Ip3 2021 06 17.43605 19 11 22.376 -20 53 33.10 25.7r 21LY44 266 C~6Ip3 2021 06 17.50053 19 11 22.088 -20 53 33.60 25.7r 21LY44 266 C~6Ip3 2021 06 17.57953 19 11 21.736 -20 53 34.19 25.7r 21LY44 266 C~6Ip3 2021 09 06.23258 19 05 59.356 -21 04 28.83 26.0r 21LY44 266 C~6Ip3 2021 09 06.31281 19 05 59.190 -21 04 29.29 26.0r 21LY44 266 C~6Ip3 2021 09 06.39352 19 05 59.025 -21 04 29.74 26.0r 21LY44 266 C~6Ip3 2022 10 20.21696 19 11 22.969 -21 02 38.97 24.5V 21LY44 266 C~7um8 2022 10 20.26058 19 11 23.050 -21 02 38.93 24.5V 21LY44 266 C~7um8 2022 10 20.29842 19 11 23.122 -21 02 38.89 24.5V 21LY44 266 C~7um8 2022 10 21.20926 19 11 24.934 -21 02 38.32 24.4V 21LY44 266 C~7um8 2022 10 21.25420 19 11 25.022 -21 02 38.28 24.4V 21LY44 266 C~7um8 2022 10 21.29846 19 11 25.110 -21 02 38.23 24.4V 21LY44 266 C~7um8 2022 10 23.20599 19 11 29.163 -21 02 36.38 24.3V 21LY44 266 C~7um8 2022 10 23.25093 19 11 29.260 -21 02 36.32 24.3V 21LY44 266 C~7um8 2022 10 23.29489 19 11 29.355 -21 02 36.26 24.3V 21LY44 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 0.02
2 0.0002 -4.91 -0.02 0.01 0.02
3 0.0005 -10.06 -0.02 0.05 0.01
4 0.0219 -476.74 0.02 0.15 -0.01
5 0.0221 -480.81 0.01 0.15 -0.01
6 0.0223 -485.77 0.02 0.17 -0.01
7 0.2431 -5047.45 0.00 -118.02 -0.01
8 0.2433 -5049.82 -0.00 -118.22 -0.01
9 0.2435 -5052.16 -0.00 -118.40 -0.01
10 1.3628 -535.09 0.01 -542.65 0.05
11 1.3630 -533.96 0.00 -542.75 0.05
12 1.3631 -532.95 0.02 -542.84 0.06
13 1.3656 -507.71 0.00 -545.37 -0.02
14 1.3657 -506.48 0.00 -545.48 -0.02
15 1.3658 -505.25 0.01 -545.58 -0.02
16 1.3710 -448.71 -0.02 -550.67 -0.03
17 1.3711 -447.35 -0.01 -550.78 -0.03
18 1.3713 -446.03 -0.01 -550.88 -0.03
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.
21LY44 quality flag:1 Type: SCATNEAR 7:2EEEEE SCATNEAR axisobj 58.112 68.209 52.237 ecceobj 0.384 0.513 0.255 incobj 4.129 4.139 4.119 qmin 35.258 32.577 38.403 qmax 83.471 109.085 67.517 amean 58.552 69.408 52.634 amin 57.650 68.068 52.104 amax 59.666 71.156 53.248 emean 0.385 0.521 0.257 emin 0.372 0.510 0.246 emax 0.399 0.533 0.268 imean 2.759 2.816 2.755 imin 2.087 2.638 2.417 imax 3.535 2.939 3.149 excite_mean 0.388 0.523 0.262 fracstop 1.000 1.000 1.000 cjmean 3.085 3.023 3.124 libcent 0 -180.0 180.1 -180.0 libamp 0 -180.0 152.7 -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 180.7 163.7 192.8 kozaiamp 180.0 179.9 180.0