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: 17DP171
# Created Sun Apr 27 01:11:06 2025
# Orbit generated from Bernstein formalism
# Fitting 20 observations of 21
# Arc: 4.19y
# First observation: 2015/01/25
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000100 0.020935 -0.000006 0.001017 0.022435 0.000000
# Chi-squared of fit: 9.58 DOF: 34 RMS: 0.12
# Min/Max residuals: -0.32 0.36
# Exact a, adot, b, bdot, g, gdot:
1.464327E-05 2.067262E-02 1.041611E-06 1.000855E-03 2.225645E-02 1.835781E-04
# Covariance matrix:
4.4601E-13 -3.4000E-13 1.1354E-14 -1.5976E-14 -8.4045E-14 -3.2885E-12
-3.4000E-13 5.3439E-13 -2.5563E-14 2.6447E-14 4.3904E-13 6.2021E-12
1.1354E-14 -2.5563E-14 3.0613E-13 -1.2216E-13 -2.5399E-14 -3.3069E-13
-1.5976E-14 2.6447E-14 -1.2216E-13 6.4533E-14 1.3390E-14 3.8573E-13
-8.4045E-14 4.3904E-13 -2.5399E-14 1.3390E-14 7.7427E-13 4.5357E-12
-3.2885E-12 6.2021E-12 -3.3069E-13 3.8573E-13 4.5357E-12 8.5736E-11
# lat0 lon0 xBary yBary zBary JD0
5.727911 -171.103925 0.882242 0.043243 -0.429627 2457048.108763
# Heliocentric elements and errors
Epoch: 2457040.5000 = 2015/01/18
Mean Anomaly: 255.85939 +/- 0.830
Argument of Peri: 168.37543 +/- 0.821
Long of Asc Node: 124.66927 +/- 0.006
Inclination: 6.35461 +/- 0.000
Eccentricity: 0.00912088 +/- 0.0004
Semi-Major Axis: 45.26759393 +/- 0.0054
Time of Perihelion: 2489221.3239 +/- 256.5
Perihelion: 44.85471373 +/- 0.0203
Aphelion: 45.68047413 +/- 0.0204
Period (y) 304.5715 +/- 0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -44.73452580 +/- 0.0017
Ecliptic Y -6.10859749 +/- 0.0003
Ecliptic Z 4.48433143 +/- 0.0002
Ecliptic XDOT 0.00037938 +/- 0.0000
Ecliptic YDOT -0.00251941 +/- 0.0000
Ecliptic ZDOT 0.00012485 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 45.37181934 +/- 0.0017
Geocenter to KBO 44.93079461 +/- 0.0018
# Hcoef: 8.60
The following table shows the complete astrometric record for 17DP171. 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 (17DP171) followed by the observatory code and reference code for the source of the astrometry.
2015 01 25.607985 12 41 42.12 +01 44 23.7 17DP171 T14 C~89Ua 2015 01 25.626431 12 41 42.10 +01 44 24.1 17DP171 T14 C~89Ua 2015 01 25.635652 12 41 42.08 +01 44 24.1 17DP171 T14 C~89Ua 2016 04 04.493549 12 42 29.76 +01 48 31.1 17DP171 T09 C~89Ua 2016 04 04.495674 12 42 29.74 +01 48 31.1 17DP171 T09 C~89Ua 2017 02 21.51236 12 49 40.78 +01 04 03.4 24.9z 17DP171 T09 C~89Ua 2017 02 21.53383 12 49 40.71 +01 04 04.0 25.2z 17DP171 T09 C~89Ua 2017 02 21.55541 12 49 40.66 +01 04 04.9 24.8z 17DP171 T09 C~89Ua 2017 02 21.57695 12 49 40.59 +01 04 05.2 24.4z 17DP171 T09 C~89Ua 2017 02 21.61983 12 49 40.46 +01 04 06.0 24.5z 17DP171 T09 C~89Ua 2017 02 23.56125 12 49 34.58 +01 04 55.1 25.4r 17DP171 T09 C~89Ua 2017 02 23.59306 12 49 34.46 +01 04 55.8 25.6r 17DP171 T09 C~89Ua 2017 02 23.62494 12 49 34.40 +01 04 57.1 25.4r 17DP171 T09 C~89Ua 2017 02 23.65665 12 49 34.28 +01 04 57.6 25.3r 17DP171 T09 C~89Ua 2017 03 06.641649 12 48 57.27 +01 09 50.5 17DP171 T09 C~89Ua 2017 04 02.334134 12 47 10.93 +01 22 14.1 17DP171 T09 C~89Ua 2017 04 02.492036 12 47 10.26 +01 22 18.3 17DP171 T09 C~89Ua 2017 04 27.395922 12 45 30.20 +01 32 19.0 17DP171 T09 C~89Ua 2017 04 27.420264 12 45 30.11 +01 32 19.6 17DP171 T09 C~89Ua 2019 04 06.383910 12 55 58.17 +00 33 20.9 17DP171 T09 C~89Ua 2019 04 06.531186 12 55 57.54 +00 33 25.0 17DP171 T09 C~89Ua
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 -0.07
2 0.0001 -0.43 0.03 0.25 0.05
3 0.0001 -0.71 -0.03 0.13 -0.14
4 1.1907 559.44 0.07 508.33 0.08
5 1.1907 559.16 -0.06 508.22 -0.04
6 2.0750 7554.36 -0.13 600.45 0.06
7 2.0751 7553.16 -0.22 600.59 0.09
8 2.0751 7552.11 ( -0.14) 601.12 ( 0.51)
9 2.0752 7551.03 -0.11 600.98 0.26
10 2.0753 7548.92 0.01 600.95 0.01
11 2.0806 7448.39 0.10 611.34 -0.10
12 2.0807 7446.46 -0.12 611.27 -0.32
13 2.0808 7445.12 0.25 612.11 0.36
14 2.0809 7443.26 0.10 611.86 -0.04
15 2.1110 6816.97 0.10 662.43 -0.02
16 2.1841 5056.81 -0.01 717.80 0.01
17 2.1845 5045.92 0.03 717.71 -0.05
18 2.2527 3429.48 -0.02 679.13 -0.05
19 2.2527 3428.00 -0.03 679.15 0.06
20 4.1938 13498.58 0.07 1139.53 -0.15
21 4.1942 13488.24 -0.06 1139.57 0.01
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.
17DP171 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 44.860 44.876 44.845 ecceobj 0.015 0.015 0.015 incobj 6.362 6.363 6.362 qmin 43.767 43.787 43.743 qmax 46.566 46.587 46.565 amean 45.100 45.116 45.086 amin 44.756 44.764 44.738 amax 45.454 45.471 45.435 emean 0.013 0.013 0.014 emin 0.000 0.001 0.001 emax 0.025 0.025 0.025 imean 4.990 4.991 4.991 imin 4.573 4.577 4.573 imax 5.434 5.430 5.432 excite_mean 0.088 0.088 0.088 fracstop 1.000 1.000 1.000 cjmean 3.106 3.106 3.105 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 181.6 181.8 181.8 kozaiamp 180.0 179.9 179.9