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: 17BW236
# Created Mon Apr 28 01:11:03 2025
# Orbit generated from Bernstein formalism
# Fitting 26 observations of 26
# Arc: 0.92y
# First observation: 2016/04/02
# Last observation: 2017/03/04
Preliminary a, adot, b, bdot, g, gdot:
-0.000055 0.024813 0.000000 0.000003 0.024265 0.000000
# Chi-squared of fit: 11.82 DOF: 46 RMS: 0.12
# Min/Max residuals: -0.32 0.23
# Exact a, adot, b, bdot, g, gdot:
1.546985E-05 2.470774E-02 3.243605E-07 4.785305E-06 2.467137E-02 -8.997032E-05
# Covariance matrix:
2.5616E-13 2.5946E-12 7.4747E-15 -1.6524E-14 1.2324E-12 9.9464E-11
2.5946E-12 1.8753E-10 3.8106E-13 -1.0651E-12 6.6751E-11 6.2414E-09
7.4747E-15 3.8106E-13 1.4782E-13 -1.8126E-13 1.4243E-13 1.2894E-11
-1.6524E-14 -1.0651E-12 -1.8126E-13 3.6328E-13 -3.8250E-13 -3.5593E-11
1.2324E-12 6.6751E-11 1.4243E-13 -3.8250E-13 2.4675E-11 2.2508E-09
9.9464E-11 6.2414E-09 1.2894E-11 -3.5593E-11 2.2508E-09 2.0884E-07
# lat0 lon0 xBary yBary zBary JD0
2.101551 -173.854404 -0.115043 0.036405 -0.988276 2457480.894196
# Heliocentric elements and errors
Epoch: 2457480.5000 = 2016/04/02
Mean Anomaly: 359.48729 +/- 16.430
Argument of Peri: 90.44513 +/- 18.595
Long of Asc Node: 96.44064 +/- 0.044
Inclination: 2.05136 +/- 0.000
Eccentricity: 0.06036206 +/- 0.0003
Semi-Major Axis: 44.19268960 +/- 0.0136
Time of Perihelion: 2457633.3248 +/- 4897.3
Perihelion: 41.52512783 +/- 0.0178
Aphelion: 46.86025136 +/- 0.0190
Period (y) 293.7879 +/- 0.14
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -41.24742412 +/- 0.0081
Ecliptic Y -4.55925845 +/- 0.0009
Ecliptic Z 1.48640566 +/- 0.0003
Ecliptic XDOT 0.00030358 +/- 0.0001
Ecliptic YDOT -0.00273204 +/- 0.0000
Ecliptic ZDOT 0.00000017 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 41.52524817 +/- 0.0081
Geocenter to KBO 40.53281940 +/- 0.0082
# Hcoef: 8.88
The following table shows the complete astrometric record for 17BW236. 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 (17BW236) followed by the observatory code and reference code for the source of the astrometry.
2016 04 02.393407 12 25 53.68 -00 30 38.0 17BW236 T09 C~86uj 2016 04 02.517894 12 25 53.11 -00 30 34.5 17BW236 T09 C~86uj 2016 04 04.34883 12 25 44.91 -00 29 42.0 26.5g 17BW236 T09 C~89UT 2016 04 04.38940 12 25 44.74 -00 29 40.8 25.9g 17BW236 T09 C~89UT 2016 04 04.40858 12 25 44.64 -00 29 40.3 26.0g 17BW236 T09 C~89UT 2016 04 06.464987 12 25 35.50 -00 28 42.6 17BW236 T09 C~86uj 2016 04 06.568131 12 25 35.04 -00 28 39.6 17BW236 T09 C~86uj 2016 06 05.31150 12 22 30.26 -00 10 48.7 25.4r 17BW236 T09 C~8COq 2016 06 05.32429 12 22 30.25 -00 10 48.9 24.7r 17BW236 T09 C~8COq 2016 06 05.32639 12 22 30.25 -00 10 48.7 24.9r 17BW236 T09 C~8COq 2016 06 05.34129 12 22 30.23 -00 10 48.7 25.3r 17BW236 T09 C~8COq 2016 06 05.35188 12 22 30.22 -00 10 48.6 25.4r 17BW236 T09 C~8COq 2017 01 28.64259 12 34 58.30 -01 30 44.1 24.9z 17BW236 T09 C~81Bp 2017 01 28.64528 12 34 58.29 -01 30 44.3 24.2z 17BW236 T09 C~81Bp 2017 01 28.65605 12 34 58.28 -01 30 44.1 24.5z 17BW236 T09 C~81Bp 2017 02 02.60942 12 34 48.62 -01 29 27.8 24.9i 17BW236 T09 C~81Bp 2017 02 02.61925 12 34 48.60 -01 29 27.4 24.8i 17BW236 T09 C~81Bp 2017 02 02.64454 12 34 48.55 -01 29 27.2 24.6i 17BW236 T09 C~81Bp 2017 02 02.65294 12 34 48.52 -01 29 27.1 24.4i 17BW236 T09 C~81Bp 2017 02 23.52446 12 33 47.97 -01 22 07.8 24.9r 17BW236 T09 C~81Bp 2017 02 23.56555 12 33 47.84 -01 22 06.8 24.7r 17BW236 T09 C~81Bp 2017 02 23.59748 12 33 47.72 -01 22 06.0 25.2r 17BW236 T09 C~81Bp 2017 02 23.59957 12 33 47.72 -01 22 06.0 25.0r 17BW236 T09 C~81Bp 2017 02 23.62935 12 33 47.59 -01 22 05.0 24.9r 17BW236 T09 C~81Bp 2017 03 04.536238 12 33 13.79 -01 18 12.9 17BW236 T09 C~85Iq 2017 03 04.614895 12 33 13.48 -01 18 10.8 17BW236 T09 C~85Iq
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 0.08 0.00 -0.07
2 0.0003 -9.24 0.08 -0.17 -0.13
3 0.0054 -142.97 -0.25 -0.59 0.06
4 0.0055 -145.78 -0.07 -0.50 0.19
5 0.0055 -147.36 -0.23 -0.63 0.07
6 0.0111 -296.10 0.17 -1.86 -0.11
7 0.0114 -303.62 0.19 -1.84 0.01
8 0.1750 -3273.10 -0.10 -114.64 0.05
9 0.1750 -3273.16 0.07 -114.88 -0.15
10 0.1750 -3273.23 0.03 -114.70 0.04
11 0.1751 -3273.51 0.01 -114.82 -0.03
12 0.1751 -3273.69 0.02 -114.78 0.04
13 0.8248 8933.73 -0.02 -84.26 0.19
14 0.8248 8933.67 0.01 -84.50 -0.06
15 0.8248 8933.45 0.12 -84.38 0.04
16 0.8384 8769.94 0.03 -71.46 -0.06
17 0.8384 8769.51 -0.03 -71.21 0.17
18 0.8385 8768.74 0.14 -71.33 0.00
19 0.8385 8768.29 0.00 -71.41 -0.10
20 0.8956 7759.02 -0.28 -26.37 -0.08
21 0.8957 7756.83 0.00 -26.22 0.02
22 0.8958 7754.85 -0.05 -26.20 0.01
23 0.8958 7754.85 0.08 -26.20 0.00
24 0.8959 7752.67 -0.32 -26.05 0.12
25 0.9203 7194.61 0.07 -13.03 -0.12
26 0.9205 7189.50 0.23 -12.94 -0.10
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.
17BW236 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.715 43.993 43.640 ecceobj 0.050 0.075 0.056 incobj 2.051 2.051 2.051 qmin 40.837 39.799 40.697 qmax 47.286 48.873 47.280 amean 43.932 44.199 43.866 amin 43.589 43.849 43.521 amax 44.293 44.576 44.230 emean 0.051 0.081 0.053 emin 0.035 0.064 0.036 emax 0.068 0.097 0.070 imean 0.697 0.737 0.704 imin 0.216 0.203 0.236 imax 1.088 1.139 1.094 excite_mean 0.053 0.082 0.055 fracstop 1.000 1.000 1.000 cjmean 3.097 3.096 3.096 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 188.8 178.4 188.0 kozaiamp 179.9 180.0 179.9