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: 17DR164
# Created Mon Apr 28 01:11:05 2025
# Orbit generated from Bernstein formalism
# Fitting 21 observations of 21
# Arc: 3.00y
# First observation: 2016/04/04
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000021 0.023045 -0.000003 0.000913 0.023683 0.000000
# Chi-squared of fit: 9.48 DOF: 36 RMS: 0.12
# Min/Max residuals: -0.34 0.33
# Exact a, adot, b, bdot, g, gdot:
1.511230E-05 2.310656E-02 9.002934E-07 9.138657E-04 2.384081E-02 1.440192E-03
# Covariance matrix:
7.3231E-13 -9.6579E-13 1.7157E-14 -3.1798E-14 -3.2046E-13 -1.0460E-11
-9.6579E-13 1.9499E-12 -4.6264E-14 7.4887E-14 7.9035E-14 2.4206E-11
1.7157E-14 -4.6264E-14 2.2399E-13 -1.5035E-13 5.7144E-15 -6.3399E-13
-3.1798E-14 7.4887E-14 -1.5035E-13 1.4779E-13 -1.0316E-15 1.0118E-12
-3.2046E-13 7.9035E-14 5.7144E-15 -1.0316E-15 5.8450E-13 3.6500E-14
-1.0460E-11 2.4206E-11 -6.3399E-13 1.0118E-12 3.6500E-14 3.2639E-10
# lat0 lon0 xBary yBary zBary JD0
3.640077 -171.370620 -0.107236 0.063010 -0.988380 2457482.943323
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 59.53897 +/- 0.113
Argument of Peri: 350.62878 +/- 0.179
Long of Asc Node: 131.18003 +/- 0.011
Inclination: 4.20956 +/- 0.000
Eccentricity: 0.07254856 +/- 0.0008
Semi-Major Axis: 44.38641689 +/- 0.0116
Time of Perihelion: 2439616.7614 +/- 33.2
Perihelion: 41.16624645 +/- 0.0365
Aphelion: 47.60658732 +/- 0.0371
Period (y) 295.7218 +/- 0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -42.35314523 +/- 0.0013
Ecliptic Y -6.53811956 +/- 0.0002
Ecliptic Z 2.66309045 +/- 0.0001
Ecliptic XDOT 0.00024167 +/- 0.0000
Ecliptic YDOT -0.00265424 +/- 0.0000
Ecliptic ZDOT 0.00011524 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.93748909 +/- 0.0013
Geocenter to KBO 41.94488487 +/- 0.0013
# Hcoef: 8.06
The following table shows the complete astrometric record for 17DR164. 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 (17DR164) followed by the observatory code and reference code for the source of the astrometry.
2016 04 04.442534 12 37 26.41 -00 04 30.9 17DR164 T09 C~83F2 2016 04 04.545119 12 37 25.95 -00 04 28.0 17DR164 T09 C~83F2 2017 02 21.48870 12 45 12.73 -00 52 26.3 24.3z 17DR164 T09 C~81Bw 2017 02 21.53656 12 45 12.57 -00 52 25.2 24.6z 17DR164 T09 C~81Bw 2017 02 21.56076 12 45 12.50 -00 52 24.3 24.7z 17DR164 T09 C~81Bw 2017 02 21.58766 12 45 12.43 -00 52 24.0 24.4z 17DR164 T09 C~81Bw 2017 02 21.60643 12 45 12.35 -00 52 23.5 24.1z 17DR164 T09 C~81Bw 2017 02 21.60910 12 45 12.35 -00 52 23.5 23.7z 17DR164 T09 C~81Bw 2017 02 23.56973 12 45 05.99 -00 51 34.9 24.7r 17DR164 T09 C~81Bw 2017 02 23.60376 12 45 05.87 -00 51 33.9 24.6r 17DR164 T09 C~81Bw 2017 02 23.61219 12 45 05.85 -00 51 33.6 24.3r 17DR164 T09 C~81Bw 2017 02 23.64192 12 45 05.75 -00 51 33.1 23.9r 17DR164 T09 C~81Bw 2017 02 23.64401 12 45 05.74 -00 51 32.8 24.3r 17DR164 T09 C~81Bw 2017 03 04.54160 12 44 34.26 -00 47 39.9 24.0y 17DR164 T09 C~81Bw 2017 03 04.58510 12 44 34.12 -00 47 38.9 24.2y 17DR164 T09 C~81Bw 2017 03 04.59585 12 44 34.07 -00 47 38.7 23.9y 17DR164 T09 C~81Bw 2017 03 04.63382 12 44 33.91 -00 47 37.4 24.0y 17DR164 T09 C~81Bw 2017 04 27.380876 12 40 49.33 -00 23 12.8 17DR164 T09 C~83F2 2017 04 27.426120 12 40 49.15 -00 23 11.7 17DR164 T09 C~83F2 2019 04 06.350099 12 52 10.92 -01 28 46.6 17DR164 T09 C~83F2 2019 04 06.501697 12 52 10.24 -01 28 42.4 17DR164 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 0.04 0.00 -0.06
2 0.0003 -7.48 -0.04 -0.05 -0.07
3 0.8845 7565.12 -0.03 106.34 0.01
4 0.8846 7562.47 -0.06 106.41 -0.08
5 0.8846 7561.15 -0.06 106.82 0.26
6 0.8847 7560.07 0.33 106.69 0.03
7 0.8848 7558.77 0.05 106.67 -0.04
8 0.8848 7558.77 0.20 106.67 -0.05
9 0.8901 7451.81 0.05 113.88 -0.05
10 0.8902 7449.76 -0.08 114.09 0.05
11 0.8903 7449.37 -0.00 114.25 0.18
12 0.8903 7447.79 0.10 114.12 -0.04
13 0.8904 7447.53 -0.04 114.34 0.17
14 0.9147 6921.20 -0.34 142.93 -0.01
15 0.9148 6918.88 0.10 143.02 -0.02
16 0.9149 6918.11 0.01 142.91 -0.16
17 0.9150 6915.39 -0.30 143.16 0.00
18 1.0621 3239.99 0.07 165.48 -0.08
19 1.0622 3237.08 0.00 165.43 -0.01
20 3.0032 14208.02 0.04 565.46 0.00
21 3.0036 14196.94 -0.03 565.32 -0.05
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.
17DR164 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.920 43.957 43.884 ecceobj 0.069 0.072 0.068 incobj 4.216 4.217 4.216 qmin 39.952 39.870 40.011 qmax 48.552 48.684 48.455 amean 44.135 44.171 44.099 amin 43.792 43.819 43.755 amax 44.512 44.548 44.474 emean 0.075 0.077 0.074 emin 0.060 0.062 0.059 emax 0.091 0.094 0.090 imean 3.204 3.200 3.208 imin 2.538 2.540 2.539 imax 3.868 3.861 3.875 excite_mean 0.094 0.096 0.093 fracstop 1.000 1.000 1.000 cjmean 3.092 3.093 3.092 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 177.9 178.6 177.7 kozaiamp 180.0 180.0 180.0