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: 20DH6
# Created Wed Dec 25 02:11:07 2024
# Orbit generated from Bernstein formalism
# Fitting 17 observations of 17
# Arc: 3.15y
# First observation: 2020/02/28
# Last observation: 2023/04/24
Preliminary a, adot, b, bdot, g, gdot:
0.000010 0.023926 -0.000001 0.000324 0.024242 0.000000
# Chi-squared of fit: 28.08 DOF: 28 RMS: 0.23
# Min/Max residuals: -0.48 0.48
# Exact a, adot, b, bdot, g, gdot:
1.621939E-05 2.388560E-02 -8.762913E-07 3.231312E-04 2.415970E-02 2.134825E-03
# Covariance matrix:
2.4300E-13 -1.8496E-13 2.7264E-16 -1.9062E-15 9.5651E-15 -1.8667E-12
-1.8496E-13 1.2125E-12 -3.0107E-15 1.3809E-14 1.6211E-12 1.5130E-11
2.7264E-16 -3.0107E-15 2.2855E-13 -8.6157E-14 -3.8103E-15 -4.0804E-14
-1.9062E-15 1.3809E-14 -8.6157E-14 5.2350E-14 1.4587E-15 2.4984E-13
9.5651E-15 1.6211E-12 -3.8103E-15 1.4587E-15 5.8711E-12 7.0201E-12
-1.8667E-12 1.5130E-11 -4.0804E-14 2.4984E-13 7.0201E-12 2.5253E-10
# lat0 lon0 xBary yBary zBary JD0
0.775734 -160.873392 0.648840 0.010246 -0.757048 2458907.746241
# Heliocentric elements and errors
Epoch: 2458900.5000 = 2020/02/21
Mean Anomaly: 49.65432 +/- 0.188
Argument of Peri: 346.27143 +/- 0.256
Long of Asc Node: 154.10434 +/- 0.021
Inclination: 1.09336 +/- 0.000
Eccentricity: 0.08761097 +/- 0.0006
Semi-Major Axis: 44.45590683 +/- 0.0178
Time of Perihelion: 2443967.4974 +/- 55.9
Perihelion: 40.56108174 +/- 0.0325
Aphelion: 48.35073191 +/- 0.0342
Period (y) 296.4165 +/- 0.18
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -40.02615507 +/- 0.0039
Ecliptic Y -13.20387151 +/- 0.0014
Ecliptic Z 0.56031539 +/- 0.0001
Ecliptic XDOT 0.00066704 +/- 0.0000
Ecliptic YDOT -0.00263393 +/- 0.0000
Ecliptic ZDOT 0.00003966 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.15150372 +/- 0.0037
Geocenter to KBO 41.39124937 +/- 0.0042
# Hcoef: 7.97
The following table shows the complete astrometric record for 20DH6. 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 (20DH6) followed by the observatory code and reference code for the source of the astrometry.
2020 02 28.24544 13 11 47.12 -06 46 15.5 20DH6 W93 C~44Aa 2020 02 28.28222 13 11 46.99 -06 46 14.7 20DH6 W93 C~44Aa 2020 03 01.20628 13 11 40.74 -06 45 35.4 20DH6 W93 C~44Aa 2020 03 01.28328 13 11 40.48 -06 45 33.5 24.1R 20DH6 W93 C~44Aa 2020 03 03.23509 13 11 33.91 -06 44 51.4 20DH6 W93 C~44Aa 2020 03 03.27422 13 11 33.77 -06 44 50.1 24.5R 20DH6 W93 C~44Aa 2022 03 26.14496 13 20 22.44 -07 35 26.6 23.9R 20DH6 W93 C~5Xxg 2022 03 26.18023 13 20 22.26 -07 35 25.8 24.2R 20DH6 W93 C~5Xxg 2022 03 26.21168 13 20 22.10 -07 35 24.4 23.7R 20DH6 W93 C~5Xxg 2022 03 28.14190 13 20 13.80 -07 34 33.8 20DH6 W93 C~5Xxg 2022 03 28.17563 13 20 13.67 -07 34 32.7 20DH6 W93 C~5Xxg 2022 03 28.21163 13 20 13.52 -07 34 31.8 23.2R 20DH6 W93 C~5Xxg 2023 03 28.18352 13 25 22.09 -08 04 03.1 23.7R 20DH6 W93 C~7xXX 2023 03 28.22185 13 25 21.91 -08 04 02.0 20DH6 W93 C~7xXX 2023 04 24.178770 13 23 21.986 -07 52 02.91 23.8G 20DH6 G37 C~6hbE 2023 04 24.241510 13 23 21.694 -07 52 01.64 20DH6 G37 C~6hbE 2023 04 24.301370 13 23 21.470 -07 51 59.63 20DH6 G37 C~6hbE
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 -0.12 0.00 0.22
2 0.0001 -2.10 -0.27 0.01 0.21
3 0.0054 -103.14 0.13 1.15 -0.48
4 0.0056 -107.44 0.04 1.44 -0.22
5 0.0109 -213.97 0.21 3.36 -0.08
6 0.0110 -216.39 0.00 3.78 0.32
7 2.0723 8220.24 0.48 152.05 -0.04
8 2.0724 8217.46 0.15 151.79 -0.30
9 2.0725 8214.72 -0.38 152.20 0.10
10 2.0777 8081.14 -0.24 152.94 -0.09
11 2.0778 8078.93 -0.07 153.24 0.21
12 2.0779 8076.52 0.07 153.24 0.21
13 3.0772 13004.85 0.11 219.27 -0.19
14 3.0773 13001.94 -0.10 219.30 -0.17
15 3.1511 11074.24 -0.14 224.16 0.15
16 3.1513 11069.73 -0.16 223.72 -0.26
17 3.1514 11065.88 0.28 224.35 0.40
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.
20DH6 quality flag:2 Type: CLASSICAL 9:5EEEE CLASSICAL axisobj 44.237 44.293 44.181 ecceobj 0.088 0.089 0.086 incobj 1.099 1.099 1.099 qmin 39.425 39.708 39.464 qmax 49.786 49.745 49.594 amean 44.476 44.554 44.419 amin 44.104 44.173 44.053 amax 44.863 44.966 44.800 emean 0.094 0.093 0.092 emin 0.076 0.080 0.075 emax 0.110 0.106 0.107 imean 1.573 1.678 1.576 imin 0.790 1.021 0.769 imax 2.285 2.264 2.300 excite_mean 0.098 0.098 0.096 fracstop 1.000 1.000 1.000 cjmean 3.096 3.097 3.095 libcent 0 -180.0 179.7 -180.0 libamp 0 -180.0 155.5 -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 168.4 164.8 180.6 kozaiamp 180.0 180.0 180.0