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: 17DD162
# Created Tue Apr 1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting 18 observations of 19
# Arc: 2.08y
# First observation: 2015/03/30
# Last observation: 2017/04/27
Preliminary a, adot, b, bdot, g, gdot:
0.000014 0.023552 0.000000 0.000227 0.024015 0.000000
# Chi-squared of fit: 7.29 DOF: 30 RMS: 0.11
# Min/Max residuals: -0.26 0.22
# Exact a, adot, b, bdot, g, gdot:
1.518680E-05 2.361075E-02 9.008104E-08 2.275430E-04 2.420065E-02 -2.968414E-05
# Covariance matrix:
7.3229E-13 -1.1523E-12 1.3296E-15 -7.8041E-15 -7.2998E-13 -1.6765E-11
-1.1523E-12 5.3428E-12 -8.0829E-15 4.7531E-14 4.4103E-12 1.0297E-10
1.3296E-15 -8.0829E-15 5.9602E-13 -3.1549E-13 -7.7163E-15 -1.6340E-13
-7.8041E-15 4.7531E-14 -3.1549E-13 1.9398E-13 4.4660E-14 9.5927E-13
-7.2998E-13 4.4103E-12 -7.7163E-15 4.4660E-14 4.4371E-12 8.9659E-11
-1.6765E-11 1.0297E-10 -1.6340E-13 9.5927E-13 8.9659E-11 2.0624E-09
# lat0 lon0 xBary yBary zBary JD0
3.912922 -171.206976 -0.006514 0.068061 -0.993190 2457111.860316
# Heliocentric elements and errors
Epoch: 2457110.5000 = 2015/03/29
Mean Anomaly: 0.98824 +/- 4.385
Argument of Peri: 80.83184 +/- 4.609
Long of Asc Node: 106.94490 +/- 0.016
Inclination: 3.85949 +/- 0.000
Eccentricity: 0.02446567 +/- 0.0001
Semi-Major Axis: 43.37864961 +/- 0.0083
Time of Perihelion: 2456824.0334 +/- 1271.0
Perihelion: 42.31736184 +/- 0.0093
Aphelion: 44.43993737 +/- 0.0097
Period (y) 285.7079 +/- 0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -41.72626199 +/- 0.0035
Ecliptic Y -6.46073567 +/- 0.0006
Ecliptic Z 2.81979440 +/- 0.0002
Ecliptic XDOT 0.00041006 +/- 0.0000
Ecliptic YDOT -0.00264479 +/- 0.0000
Ecliptic ZDOT 0.00002554 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.31752929 +/- 0.0035
Geocenter to KBO 41.32121036 +/- 0.0036
# Hcoef: 7.86
The following table shows the complete astrometric record for 17DD162. 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 (17DD162) followed by the observatory code and reference code for the source of the astrometry.
2015 03 30.359538 12 38 28.19 +00 06 41.1 17DD162 T09 C~83F2 2015 03 30.398433 12 38 28.01 +00 06 42.3 17DD162 T09 C~83F2 2016 04 04.445379 12 43 02.71 -00 21 49.1 17DD162 T09 C~83F2 2016 04 04.547236 12 43 02.25 -00 21 46.5 17DD162 T09 C~83F2 2017 02 21.49208 12 50 53.33 -01 12 31.2 23.9z 17DD162 T09 C~7xU4 2017 02 21.51771 12 50 53.25 -01 12 30.5 24.3z 17DD162 T09 C~7xU4 2017 02 21.53924 12 50 53.18 -01 12 30.2 23.9z 17DD162 T09 C~7xU4 2017 02 21.59034 12 50 53.01 -01 12 28.9 23.9z 17DD162 T09 C~7xU4 2017 02 21.60376 12 50 52.97 -01 12 28.5 23.7z 17DD162 T09 C~7xU4 2017 02 23.53285 12 50 46.78 -01 11 41.5 24.8r 17DD162 T09 C~7xU4 2017 02 23.57183 12 50 46.66 -01 11 40.5 24.4r 17DD162 T09 C~7xU4 2017 02 23.63562 12 50 46.43 -01 11 39.1 23.9r 17DD162 T09 C~7xU4 2017 02 23.64611 12 50 46.39 -01 11 38.8 23.6r 17DD162 T09 C~7xU4 2017 03 25.37615 12 48 49.12 -00 57 59.4 23.4y 17DD162 T09 C~7xU4 2017 03 25.41476 12 48 49.02 -00 57 58.2 23.6y 17DD162 T09 C~7xU4 2017 03 25.41743 12 48 48.94 -00 57 58.2 23.4y 17DD162 T09 C~7xU4 2017 04 27.40255 12 46 26.25 -00 43 19.8 24.0i 17DD162 T09 C~7xU4 2017 04 27.42613 12 46 26.16 -00 43 19.2 24.3i 17DD162 T09 C~7xU4 2017 04 27.42903 12 46 26.15 -00 43 19.4 24.1i 17DD162 T09 C~7xU4
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 0.05 0.00 0.01
2 0.0001 -2.95 -0.04 0.04 0.06
3 1.0160 4459.25 -0.06 46.16 0.02
4 1.0163 4451.88 0.04 45.84 -0.22
5 1.9004 12158.78 0.07 21.87 0.12
6 1.9005 12157.40 0.07 22.05 0.22
7 1.9006 12156.31 0.15 21.91 0.01
8 1.9007 12153.45 0.05 22.11 0.04
9 1.9007 12152.74 0.06 22.24 0.13
10 1.9060 12048.55 -0.04 29.03 0.00
11 1.9061 12046.50 0.10 29.24 0.10
12 1.9063 12042.76 -0.06 29.17 -0.16
13 1.9063 12042.09 -0.15 29.21 -0.15
14 1.9877 10097.26 -0.26 92.17 -0.02
15 1.9878 10095.41 ( 0.71) 92.69 ( 0.48)
16 1.9878 10094.30 -0.20 92.22 0.01
17 2.0781 7776.80 -0.00 59.16 -0.04
18 2.0782 7775.32 0.05 59.18 0.05
19 2.0782 7775.26 0.18 58.94 -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.
17DD162 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 42.972 42.991 42.953 ecceobj 0.015 0.015 0.015 incobj 3.860 3.860 3.860 qmin 41.578 41.617 41.482 qmax 44.994 44.995 45.040 amean 43.196 43.216 43.177 amin 42.864 42.884 42.843 amax 43.533 43.555 43.512 emean 0.017 0.016 0.018 emin 0.000 0.000 0.000 emax 0.034 0.033 0.035 imean 2.369 2.364 2.373 imin 1.497 1.501 1.493 imax 3.129 3.116 3.139 excite_mean 0.045 0.045 0.045 fracstop 1.000 1.000 1.000 cjmean 3.089 3.090 3.089 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 193.4 194.9 192.1 kozaiamp 180.0 180.0 180.0