Orbit Fit and Astrometric record for 17BJ232

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: 17BJ232   
# Created Thu Oct 31 01:10:31 2024
# Orbit generated from Bernstein formalism
# Fitting     27 observations of     27
# Arc:   3.00y
# First observation: 2016/04/02
#  Last observation: 2019/04/03
Preliminary a, adot, b, bdot, g, gdot:
  -0.000109   0.036590  -0.000016   0.002843   0.029937   0.000000
# Chi-squared of fit:    11.38 DOF:     48 RMS:  0.11
# Min/Max residuals:    -0.27    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.849084E-05  3.638550E-02  1.775304E-06  2.831557E-03  3.067170E-02 -5.822204E-04
# Covariance matrix:
  1.4890E-13 -4.6037E-13  8.2092E-15 -2.9271E-14  6.8758E-14 -3.7337E-12
 -4.6037E-13  2.8691E-12 -5.6602E-14  1.9738E-13 -6.0691E-13  2.5171E-11
  8.2092E-15 -5.6602E-14  8.7655E-14 -5.6785E-14  1.3033E-14 -5.1098E-13
 -2.9271E-14  1.9738E-13 -5.6785E-14  1.0285E-13 -4.0523E-14  1.7925E-12
  6.8758E-14 -6.0691E-13  1.3033E-14 -4.0523E-14  2.8690E-13 -5.1618E-12
 -3.7337E-12  2.5171E-11 -5.1098E-13  1.7925E-12 -5.1618E-12  2.2860E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.971481 -176.354668   -0.158195    0.033955   -0.982383  2457480.901124
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          357.65850 +/-     0.088
Argument of Peri:       27.06096 +/-     0.138
Long of Asc Node:      160.60098 +/-     0.002
Inclination:             4.82485 +/-     0.000
Eccentricity:         0.21040715 +/-    0.0001
Semi-Major Axis:     42.52579350 +/-    0.0085
Time of Perihelion: 2458139.3236 +/-      24.8
Perihelion:          33.57806230 +/-    0.0086
Aphelion:            51.47352471 +/-    0.0117
Period (y)              277.3236 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -33.49277458 +/-    0.0006
Ecliptic Y           -2.29471714 +/-    0.0000
Ecliptic Z            1.12170361 +/-    0.0000
Ecliptic XDOT         0.00026712 +/-    0.0000
Ecliptic YDOT        -0.00324444 +/-    0.0000
Ecliptic ZDOT         0.00025082 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   33.59002671 +/-    0.0006
Geocenter to KBO     32.60334676 +/-    0.0006
# Hcoef:  9.76

The following table shows the complete astrometric record for 17BJ232. 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 (17BJ232) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.400335 12 16 30.72   +00 21 36.9         17BJ232   T09  C~81Bn      
2016 04  02.523267 12 16 30.05   +00 21 41.3         17BJ232   T09  C~81Bn      
2016 04  04.34312  12 16 20.44   +00 22 45.9   25.4g 17BJ232   T09  C~89UT      
2016 04  04.35452  12 16 20.38   +00 22 45.9   26.4g 17BJ232   T09  C~89UT      
2016 04  04.36588  12 16 20.33   +00 22 46.6   25.7g 17BJ232   T09  C~89UT      
2016 04  04.38727  12 16 20.21   +00 22 47.1   25.8g 17BJ232   T09  C~89UT      
2016 04  05.428310 12 16 14.74   +00 23 23.8         17BJ232   T09  C~81Bn      
2016 04  05.487196 12 16 14.42   +00 23 25.8         17BJ232   T09  C~81Bn      
2016 04  06.454378 12 16 09.37   +00 23 59.5         17BJ232   T09  C~81Bn      
2016 04  06.551247 12 16 08.85   +00 24 02.9         17BJ232   T09  C~81Bn      
2016 06  04.30815  12 12 45.65   +00 45 14.5   24.3z 17BJ232   T09  C~8COq      
2016 06  04.31085  12 12 45.65   +00 45 14.3   24.1z 17BJ232   T09  C~8COq      
2016 06  04.32438  12 12 45.65   +00 45 14.3   24.2z 17BJ232   T09  C~8COq      
2016 06  04.34057  12 12 45.62   +00 45 14.5   24.5z 17BJ232   T09  C~8COq      
2017 01  23.60759  12 29 13.95   -00 54 21.6   25.0i 17BJ232   T09  C~7xTo      
2017 01  23.61026  12 29 13.95   -00 54 21.6   25.0i 17BJ232   T09  C~7xTo      
2017 01  23.62095  12 29 13.94   -00 54 21.2   24.9i 17BJ232   T09  C~7xTo      
2017 01  23.64653  12 29 13.87   -00 54 20.9   25.1i 17BJ232   T09  C~7xTo      
2017 01  28.59194  12 29 04.86   -00 52 55.7   24.6z 17BJ232   T09  C~7xTo      
2017 01  28.60345  12 29 04.83   -00 52 55.6   24.6z 17BJ232   T09  C~7xTo      
2017 01  28.61691  12 29 04.81   -00 52 55.2   24.6z 17BJ232   T09  C~7xTo      
2017 01  28.65069  12 29 04.73   -00 52 54.7   24.6z 17BJ232   T09  C~7xTo      
2017 02  23.52167  12 27 40.02   -00 41 45.6   25.2r 17BJ232   T09  C~81Bn      
2017 02  23.59538  12 27 39.67   -00 41 43.2   26.2r 17BJ232   T09  C~81Bn      
2017 02  23.60592  12 27 39.65   -00 41 42.7   25.3r 17BJ232   T09  C~81Bn      
2019 04  03.442715 12 40 17.25   -01 40 37.1         17BJ232   T09  C~81Bn      
2019 04  03.464217 12 40 17.13   -01 40 36.3         17BJ232   T09  C~81Bn      

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     0.06       0.00    -0.07
     2   0.0003    -10.97    -0.03       0.05    -0.07
     3   0.0053   -168.92    -0.20       2.12     0.09
     4   0.0054   -169.74    -0.03       1.76    -0.27
     5   0.0054   -170.71     0.01       2.10     0.07
     6   0.0054   -172.56     0.04       1.85    -0.19
     7   0.0083   -262.44     0.06       2.96     0.02
     8   0.0085   -267.64     0.01       2.89    -0.07
     9   0.0111   -350.54     0.11       3.75    -0.02
    10   0.0114   -359.05     0.01       3.78    -0.03
    11   0.1722  -3661.62    -0.14     -38.79     0.14
    12   0.1722  -3661.54    -0.02     -38.98    -0.04
    13   0.1723  -3661.54     0.19     -38.98    -0.01
    14   0.1723  -3662.04    -0.05     -38.97     0.03
    15   0.8110  12331.68     0.03     360.81    -0.04
    16   0.8110  12331.68     0.11     360.81    -0.06
    17   0.8110  12331.39     0.12     361.12     0.21
    18   0.8111  12330.30    -0.21     360.98    -0.05
    19   0.8246  12171.90     0.00     385.60     0.22
    20   0.8246  12171.44    -0.02     385.52     0.08
    21   0.8247  12171.01     0.05     385.77     0.28
    22   0.8248  12169.70     0.02     385.75     0.12
    23   0.8956  10733.56     0.10     495.86    -0.09
    24   0.8958  10727.78    -0.27     495.98    -0.19
    25   0.8958  10727.30     0.03     496.32     0.12
    26   3.0008  22640.06     0.03    1762.76    -0.09
    27   3.0009  22638.07    -0.01    1762.78    -0.07

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.

17BJ232    quality flag:3

Type:          5:3EE     5:3EE     5:3EE

axisobj        42.037    42.120    41.955
ecceobj         0.201     0.202     0.199
incobj          4.843     4.843     4.843
qmin           32.502    32.885    32.606
qmax           52.812    52.388    52.762
amean          42.328    42.327    42.328
amin           41.819    41.873    41.791
amax           42.906    42.851    42.951
emean           0.205     0.205     0.209
emin            0.138     0.187     0.182
emax            0.232     0.224     0.230
imean           4.583     4.448     5.371
imin            2.352     3.912     4.063
imax            8.958     5.405     7.150
excite_mean     0.223     0.219     0.230
fracstop        1.000     1.000     1.000
cjmean          3.023     3.025     3.019

libcent 0       177.0     180.4     177.4
libamp  0       120.3      81.9     133.7
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       240.9     189.1     146.2
kozaiamp        179.9     180.0      95.8