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: 17DP164
# Created Tue Apr 1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting 27 observations of 27
# Arc: 4.02y
# First observation: 2015/03/30
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
-0.000235 0.021553 -0.000070 0.003869 0.022772 0.000000
# Chi-squared of fit: 10.48 DOF: 48 RMS: 0.11
# Min/Max residuals: -0.33 0.23
# Exact a, adot, b, bdot, g, gdot:
1.467101E-05 2.132660E-02 2.538112E-06 3.822165E-03 2.304398E-02 -1.860764E-03
# Covariance matrix:
6.4147E-13 -5.2971E-13 7.0635E-14 -7.6980E-14 -1.4940E-13 -4.3734E-12
-5.2971E-13 6.4199E-13 -1.0429E-13 1.1146E-13 -2.6550E-14 6.3220E-12
7.0635E-14 -1.0429E-13 2.9969E-13 -1.3154E-13 1.4481E-14 -1.1306E-12
-7.6980E-14 1.1146E-13 -1.3154E-13 7.6167E-14 -1.1474E-14 1.2052E-12
-1.4940E-13 -2.6550E-14 1.4481E-14 -1.1474E-14 4.5266E-13 -6.3222E-13
-4.3734E-12 6.3220E-12 -1.1306E-12 1.2052E-12 -6.3222E-13 6.8345E-11
# lat0 lon0 xBary yBary zBary JD0
3.495678 -172.332425 -0.026011 0.060807 -0.993340 2457111.857159
# Heliocentric elements and errors
Epoch: 2457110.5000 = 2015/03/29
Mean Anomaly: 278.33596 +/- 0.047
Argument of Peri: 110.00409 +/- 0.077
Long of Asc Node: 169.24632 +/- 0.001
Inclination: 10.68253 +/- 0.001
Eccentricity: 0.08366535 +/- 0.0004
Semi-Major Axis: 44.62331591 +/- 0.0051
Time of Perihelion: 2481808.9415 +/- 13.5
Perihelion: 40.88989075 +/- 0.0175
Aphelion: 48.35674107 +/- 0.0177
Period (y) 298.0924 +/- 0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -43.91315504 +/- 0.0013
Ecliptic Y -5.93808425 +/- 0.0002
Ecliptic Z 2.64607943 +/- 0.0001
Ecliptic XDOT 0.00058089 +/- 0.0000
Ecliptic YDOT -0.00248387 +/- 0.0000
Ecliptic ZDOT 0.00043987 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 44.39175336 +/- 0.0012
Geocenter to KBO 43.39527425 +/- 0.0013
# Hcoef: 7.59
The following table shows the complete astrometric record for 17DP164. 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 (17DP164) followed by the observatory code and reference code for the source of the astrometry.
2015 03 30.356381 12 33 40.99 +00 10 12.0 17DP164 T09 C~83F2 2015 03 30.395233 12 33 40.82 +00 10 13.0 17DP164 T09 C~83F2 2016 04 04.442534 12 38 07.79 -00 03 53.9 17DP164 T09 C~83F2 2016 04 04.515201 12 38 07.47 -00 03 51.6 17DP164 T09 C~83F2 2017 02 21.48870 12 45 43.68 -00 41 07.6 23.5z 17DP164 T09 C~81Bw 2017 02 21.49884 12 45 43.66 -00 41 07.3 23.9z 17DP164 T09 C~81Bw 2017 02 21.51504 12 45 43.60 -00 41 06.9 23.9z 17DP164 T09 C~81Bw 2017 02 21.53656 12 45 43.53 -00 41 06.6 23.5z 17DP164 T09 C~81Bw 2017 02 21.53924 12 45 43.53 -00 41 06.3 23.7z 17DP164 T09 C~81Bw 2017 02 21.56076 12 45 43.46 -00 41 05.9 23.6z 17DP164 T09 C~81Bw 2017 02 21.58766 12 45 43.37 -00 41 05.3 23.5z 17DP164 T09 C~81Bw 2017 02 21.60643 12 45 43.30 -00 41 04.7 23.3z 17DP164 T09 C~81Bw 2017 02 21.60910 12 45 43.30 -00 41 04.6 23.6z 17DP164 T09 C~81Bw 2017 02 23.56973 12 45 37.19 -00 40 13.8 24.2r 17DP164 T09 C~81Bw 2017 02 23.60376 12 45 37.07 -00 40 12.8 24.2r 17DP164 T09 C~81Bw 2017 02 23.61219 12 45 37.03 -00 40 12.7 24.0r 17DP164 T09 C~81Bw 2017 02 23.64401 12 45 36.92 -00 40 11.5 24.5r 17DP164 T09 C~81Bw 2017 03 04.54160 12 45 06.56 -00 36 08.9 24.1y 17DP164 T09 C~81Bw 2017 03 04.58510 12 45 06.40 -00 36 07.7 23.8y 17DP164 T09 C~81Bw 2017 03 04.59585 12 45 06.36 -00 36 07.6 23.9y 17DP164 T09 C~81Bw 2017 03 04.63382 12 45 06.23 -00 36 06.6 24.0y 17DP164 T09 C~81Bw 2017 04 27.380876 12 41 28.69 -00 10 50.8 17DP164 T09 C~83F2 2017 04 27.426120 12 41 28.51 -00 10 49.8 17DP164 T09 C~83F2 2019 04 06.35011 12 52 43.66 -00 54 24.6 23.8i 17DP164 T09 C~83F2 2019 04 06.44937 12 52 43.23 -00 54 21.8 23.9i 17DP164 T09 C~83F2 2019 04 06.46047 12 52 43.18 -00 54 21.4 24.2i 17DP164 T09 C~83F2 2019 04 06.51511 12 52 42.93 -00 54 19.9 23.8i 17DP164 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 -0.01 0.00 0.02
2 0.0001 -2.74 0.01 -0.09 -0.13
3 1.0160 4011.88 0.14 800.45 -0.16
4 1.0162 4006.56 -0.06 800.67 -0.02
5 1.9004 11187.51 -0.05 1444.07 0.08
6 1.9005 11187.11 0.10 1444.23 0.19
7 1.9005 11186.13 -0.02 1444.24 0.12
8 1.9006 11185.04 0.05 1444.10 -0.12
9 1.9006 11184.92 0.07 1444.38 0.14
10 1.9006 11183.80 0.10 1444.33 -0.01
11 1.9007 11182.31 0.06 1444.35 -0.13
12 1.9008 11181.11 -0.14 1444.49 -0.08
13 1.9008 11181.07 -0.03 1444.58 -0.00
14 1.9061 11076.52 0.20 1455.16 0.07
15 1.9062 11074.47 0.03 1455.37 0.12
16 1.9062 11073.87 -0.10 1455.23 -0.07
17 1.9063 11071.88 -0.33 1455.68 0.23
18 1.9307 10556.34 -0.10 1499.19 0.15
19 1.9308 10553.65 -0.07 1499.34 0.13
20 1.9308 10553.06 0.00 1499.20 -0.06
21 1.9309 10550.87 0.17 1499.35 -0.07
22 2.0781 6947.91 0.00 1605.88 -0.07
23 2.0782 6945.03 -0.08 1605.73 -0.17
24 4.0191 17322.01 0.06 3199.47 0.01
25 4.0194 17314.93 0.08 3199.50 -0.05
26 4.0194 17314.08 0.03 3199.57 0.01
27 4.0196 17310.01 -0.13 3199.47 -0.14
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.
17DP164 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 44.208 44.223 44.193 ecceobj 0.084 0.084 0.085 incobj 10.734 10.735 10.734 qmin 40.160 40.215 40.120 qmax 49.019 49.043 49.018 amean 44.452 44.468 44.437 amin 44.105 44.122 44.088 amax 44.834 44.837 44.812 emean 0.080 0.080 0.081 emin 0.068 0.066 0.067 emax 0.094 0.094 0.094 imean 10.465 10.465 10.464 imin 9.981 9.977 9.984 imax 10.961 10.954 10.966 excite_mean 0.199 0.199 0.199 fracstop 1.000 1.000 1.000 cjmean 3.059 3.059 3.059 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 179.6 179.4 179.7 kozaiamp 179.9 180.0 179.9