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: 17DT164
# Created Tue Apr 1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting 20 observations of 21
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000053 0.023258 0.000002 -0.000757 0.023614 0.000000
# Chi-squared of fit: 13.04 DOF: 34 RMS: 0.14
# Min/Max residuals: -0.35 0.36
# Exact a, adot, b, bdot, g, gdot:
1.582495E-05 2.314432E-02 -4.470593E-07 -7.542669E-04 2.382724E-02 -9.855275E-04
# Covariance matrix:
4.8819E-13 -6.4249E-13 -9.1809E-15 1.7336E-14 -2.1139E-13 -6.8735E-12
-6.4249E-13 2.0862E-12 2.5830E-14 -6.6466E-14 -4.6788E-13 2.7178E-11
-9.1809E-15 2.5830E-14 1.8908E-13 -1.0661E-13 -1.2483E-15 3.4635E-13
1.7336E-14 -6.6466E-14 -1.0661E-13 9.9358E-14 1.6941E-14 -9.0995E-13
-2.1139E-13 -4.6788E-13 -1.2483E-15 1.6941E-14 8.4723E-13 -7.3978E-12
-6.8735E-12 2.7178E-11 3.4635E-13 -9.0995E-13 -7.3978E-12 3.7273E-10
# lat0 lon0 xBary yBary zBary JD0
3.591617 -171.749199 -0.113777 0.062128 -0.987704 2457482.943323
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 313.95459 +/- 0.633
Argument of Peri: 168.67713 +/- 0.739
Long of Asc Node: 70.25529 +/- 0.010
Inclination: 3.97788 +/- 0.000
Eccentricity: 0.05266644 +/- 0.0006
Semi-Major Axis: 44.52081978 +/- 0.0083
Time of Perihelion: 2471358.5041 +/- 190.9
Perihelion: 42.17606683 +/- 0.0260
Aphelion: 46.86557274 +/- 0.0263
Period (y) 297.0660 +/- 0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -42.41955874 +/- 0.0016
Ecliptic Y -6.26830038 +/- 0.0002
Ecliptic Z 2.62912496 +/- 0.0001
Ecliptic XDOT 0.00048824 +/- 0.0000
Ecliptic YDOT -0.00262340 +/- 0.0000
Ecliptic ZDOT -0.00009359 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.96071288 +/- 0.0016
Geocenter to KBO 41.96877817 +/- 0.0016
# Hcoef: 8.16
The following table shows the complete astrometric record for 17DT164. 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 (17DT164) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.442534 12 35 58.47 +00 01 43.9 17DT164 T09 C~83F2 2016 04 04.545119 12 35 58.01 +00 01 46.6 17DT164 T09 C~83F2 2016 04 04.555772 12 35 57.98 +00 01 46.7 17DT164 T09 C~83F2 2017 02 21.48870 12 43 38.55 -00 51 02.0 24.0z 17DT164 T09 C~81Bw 2017 02 21.51504 12 43 38.46 -00 51 01.3 24.7z 17DT164 T09 C~81Bw 2017 02 21.53656 12 43 38.39 -00 51 01.0 23.8z 17DT164 T09 C~81Bw 2017 02 21.55809 12 43 38.32 -00 51 00.7 24.2z 17DT164 T09 C~81Bw 2017 02 21.58766 12 43 38.21 -00 50 59.1 24.0z 17DT164 T09 C~81Bw 2017 02 23.53005 12 43 31.83 -00 50 13.3 24.9r 17DT164 T09 C~81Bw 2017 02 23.56973 12 43 31.69 -00 50 12.3 25.2r 17DT164 T09 C~81Bw 2017 02 23.60167 12 43 31.58 -00 50 11.6 24.7r 17DT164 T09 C~81Bw 2017 02 23.61219 12 43 31.56 -00 50 11.3 24.5r 17DT164 T09 C~81Bw 2017 02 23.64192 12 43 31.45 -00 50 10.6 24.6r 17DT164 T09 C~81Bw 2017 03 04.54160 12 42 59.56 -00 46 24.9 23.9y 17DT164 T09 C~81Bw 2017 03 04.58243 12 42 59.41 -00 46 23.9 24.3y 17DT164 T09 C~81Bw 2017 03 04.63107 12 42 59.24 -00 46 23.1 24.2y 17DT164 T09 C~81Bw 2017 03 04.63382 12 42 59.19 -00 46 22.6 23.7y 17DT164 T09 C~81Bw 2017 04 27.380876 12 39 13.08 -00 22 42.9 17DT164 T09 C~83F2 2019 04 03.469560 12 50 36.27 -01 40 35.2 17DT164 T09 C~83F2 2019 04 06.460461 12 50 23.06 -01 39 13.6 17DT164 T09 C~83F2 2019 04 06.501697 12 50 22.86 -01 39 12.6 17DT164 T09 C~83F2
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 -0.10 0.00 -0.01
2 0.0003 -7.41 -0.11 -0.23 -0.10
3 0.0003 -7.86 0.20 -0.32 -0.17
4 0.8845 7593.45 0.07 -194.32 0.21
5 0.8845 7591.93 0.00 -194.20 0.26
6 0.8846 7590.84 0.10 -194.34 0.08
7 0.8846 7589.76 0.20 -194.48 -0.11
8 0.8847 7587.61 ( -0.32) -193.66 ( 0.65)
9 0.8900 7481.48 -0.04 -189.19 0.05
10 0.8901 7479.15 -0.12 -189.10 0.06
11 0.8902 7477.36 -0.09 -189.11 -0.01
12 0.8903 7476.96 0.11 -188.95 0.12
13 0.8903 7475.17 0.00 -188.95 0.05
14 0.9147 6945.99 -0.22 -169.63 0.07
15 0.9148 6943.53 -0.07 -169.60 0.05
16 0.9150 6940.87 0.36 -169.87 -0.29
17 0.9150 6939.98 -0.35 -169.70 -0.13
18 1.0621 3261.12 0.05 -199.28 0.01
19 2.9953 14542.78 0.06 -465.95 0.04
20 3.0035 14327.53 0.05 -468.70 0.02
21 3.0036 14324.36 -0.11 -468.96 -0.17
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.
17DT164 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 44.033 44.061 44.005 ecceobj 0.046 0.044 0.047 incobj 3.981 3.981 3.981 qmin 41.601 41.666 41.520 qmax 47.118 47.124 47.154 amean 44.270 44.298 44.242 amin 43.928 43.958 43.893 amax 44.623 44.664 44.599 emean 0.042 0.041 0.043 emin 0.028 0.026 0.027 emax 0.057 0.056 0.058 imean 2.386 2.393 2.381 imin 1.783 1.801 1.765 imax 2.934 2.933 2.934 excite_mean 0.060 0.059 0.060 fracstop 1.000 1.000 1.000 cjmean 3.100 3.101 3.100 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 185.6 185.4 185.7 kozaiamp 180.0 180.0 180.0