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: 21DH17
# Created Sun Nov 24 02:11:06 2024
# Orbit generated from Bernstein formalism
# Fitting 15 observations of 15
# Arc: 4.95y
# First observation: 2019/01/28
# Last observation: 2024/01/09
Preliminary a, adot, b, bdot, g, gdot:
0.000093 0.015462 0.000015 0.002952 0.019498 0.000000
# Chi-squared of fit: 10.78 DOF: 24 RMS: 0.15
# Min/Max residuals: -0.33 0.33
# Exact a, adot, b, bdot, g, gdot:
1.271929E-05 1.552859E-02 1.547585E-06 2.964997E-03 1.952532E-02 5.453238E-04
# Covariance matrix:
9.9668E-13 -6.2921E-13 1.0032E-13 -9.2215E-14 -2.9922E-13 -5.4949E-12
-6.2921E-13 8.3161E-13 -1.7381E-13 1.5969E-13 1.0081E-12 9.4625E-12
1.0032E-13 -1.7381E-13 5.3200E-13 -1.8001E-13 -2.3781E-13 -2.1268E-12
-9.2215E-14 1.5969E-13 -1.8001E-13 8.5611E-14 2.1844E-13 1.9541E-12
-2.9922E-13 1.0081E-12 -2.3781E-13 2.1844E-13 1.8397E-12 1.2893E-11
-5.4949E-12 9.4625E-12 -2.1268E-12 1.9541E-12 1.2893E-11 1.1572E-10
# lat0 lon0 xBary yBary zBary JD0
1.359218 150.764778 0.390851 0.021724 -0.910746 2458511.762283
# Heliocentric elements and errors
Epoch: 2458510.5000 = 2019/01/27
Mean Anomaly: 168.83035 +/- 0.237
Argument of Peri: 195.63208 +/- 0.238
Long of Asc Node: 143.39541 +/- 0.001
Inclination: 10.91038 +/- 0.001
Eccentricity: 0.13744171 +/- 0.0002
Semi-Major Axis: 45.90627063 +/- 0.0065
Time of Perihelion: 2405231.6958 +/- 74.0
Perihelion: 39.59683417 +/- 0.0095
Aphelion: 52.21570710 +/- 0.0106
Period (y) 311.0400 +/- 0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -45.28266189 +/- 0.0031
Ecliptic Y 25.78439077 +/- 0.0017
Ecliptic Z 1.21488028 +/- 0.0001
Ecliptic XDOT -0.00111355 +/- 0.0000
Ecliptic YDOT -0.00186929 +/- 0.0000
Ecliptic ZDOT 0.00041724 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 52.12322140 +/- 0.0028
Geocenter to KBO 51.21555512 +/- 0.0036
# Hcoef: 6.47
The following table shows the complete astrometric record for 21DH17. 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 (21DH17) followed by the observatory code and reference code for the source of the astrometry.
2019 01 28.261482 10 13 14.85 +12 28 23.2 23.4i 21DH17 W84 C~5zHK 2020 03 05.135421 10 14 35.36 +12 32 59.5 22.9i 21DH17 W84 C~5zHK 2021 01 27.228479 10 20 33.24 +12 09 02.1 22.8i 21DH17 W84 C~5zHK 2021 02 17.29281 10 19 15.665 +12 17 10.92 23.5r 21DH17 568 C~5fvg 2021 02 17.36006 10 19 15.413 +12 17 12.60 23.3r 21DH17 568 C~5fvg 2021 02 22.228061 10 18 56.63 +12 19 08.0 23.0i 21DH17 W84 C~5zHK 2021 04 12.19511 10 16 14.653 +12 35 02.01 24.0r 21DH17 304 C~5fvg 2021 04 13.13408 10 16 12.554 +12 35 13.88 23.7r 21DH17 304 C~5fvg 2022 03 07.23886 10 21 45.821 +12 14 19.48 23.8G 21DH17 304 C~5fvg 2022 03 07.28579 10 21 45.631 +12 14 20.88 21DH17 304 C~5fvg 2022 04 07.99502 10 20 02.396 +12 24 26.90 24.0r 21DH17 304 C~5fvg 2022 04 08.99563 10 19 59.866 +12 24 41.17 23.5r 21DH17 304 C~5fvg 2024 01 09.457450 10 32 17.089 +11 32 49.59 23.8G 21DH17 G37 C~7gyj 2024 01 09.497470 10 32 16.978 +11 32 50.39 21DH17 G37 C~7gyj 2024 01 09.535520 10 32 16.886 +11 32 51.28 21DH17 G37 C~7gyj
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 -0.03 0.00 0.18
2 1.1003 1003.31 0.09 678.02 -0.33
3 1.9985 6415.70 0.07 1221.01 0.33
4 2.0562 5177.64 -0.23 1265.83 -0.09
5 2.0564 5173.59 -0.11 1266.06 0.03
6 2.0697 4875.04 0.25 1274.41 0.07
7 2.2038 2317.33 -0.10 1312.08 -0.01
8 2.2064 2284.39 -0.04 1312.16 -0.01
9 3.1047 7293.58 0.18 1902.97 -0.29
10 3.1048 7290.48 -0.10 1903.26 -0.03
11 3.1916 5659.17 -0.10 1919.97 0.06
12 3.1943 5619.42 0.15 1919.87 -0.04
13 4.9478 16861.56 0.16 2996.08 -0.03
14 4.9479 16859.74 -0.06 2996.21 -0.02
15 4.9480 16858.14 -0.14 2996.54 0.18
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.
21DH17 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 45.978 45.996 45.960 ecceobj 0.139 0.138 0.139 incobj 10.914 10.914 10.915 qmin 38.890 38.959 38.847 qmax 53.439 53.443 53.427 amean 46.011 46.030 45.988 amin 45.604 45.642 45.594 amax 46.437 46.465 46.411 emean 0.139 0.139 0.139 emin 0.127 0.126 0.127 emax 0.152 0.151 0.152 imean 9.811 9.815 9.815 imin 9.304 9.302 9.293 imax 10.265 10.270 10.282 excite_mean 0.220 0.220 0.220 fracstop 1.000 1.000 1.000 cjmean 3.067 3.067 3.066 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 182.8 182.9 182.4 kozaiamp 180.0 180.0 180.0