Orbit Fit and Astrometric record for 17BW236

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 Tue Apr  1 01:11:02 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