Orbit Fit and Astrometric record for 17BJ230

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: 17BJ230   
# Created Fri Nov 22 02:10:48 2024
# Orbit generated from Bernstein formalism
# Fitting     36 observations of     36
# Arc:   2.01y
# First observation: 2016/01/15
#  Last observation: 2018/01/17
Preliminary a, adot, b, bdot, g, gdot:
   0.000026   0.022177  -0.000055  -0.011582   0.025022   0.000000
# Chi-squared of fit:    22.28 DOF:     66 RMS:  0.14
# Min/Max residuals:    -0.38    0.31
# Exact a, adot, b, bdot, g, gdot:
  1.338803E-05  2.232142E-02 -7.741411E-06 -1.167488E-02  2.517527E-02  4.502261E-03
# Covariance matrix:
  4.0351E-13 -4.7600E-13 -6.5948E-14  1.4602E-13 -1.0904E-13 -5.6987E-12
 -4.7600E-13  9.1256E-13  1.8514E-13 -4.0495E-13  5.2082E-13  1.5807E-11
 -6.5948E-14  1.8514E-13  3.2753E-13 -3.1908E-13  1.3762E-13  4.0705E-12
  1.4602E-13 -4.0495E-13 -3.1908E-13  4.2126E-13 -2.9606E-13 -8.9005E-12
 -1.0904E-13  5.2082E-13  1.3762E-13 -2.9606E-13  5.9949E-13  1.1560E-11
 -5.6987E-12  1.5807E-11  4.0705E-12 -8.9005E-12  1.1560E-11  3.4743E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -9.553331  151.251789    0.589507   -0.130474   -0.776323  2457403.111008
# Heliocentric elements and errors
Epoch:              2457400.5000  =  2016/01/13
Mean Anomaly:           58.99373 +/-     0.032
Argument of Peri:      121.84827 +/-     0.050
Long of Asc Node:      313.15831 +/-     0.001
Inclination:            29.08202 +/-     0.001
Eccentricity:         0.17255721 +/-    0.0007
Semi-Major Axis:     43.28055980 +/-    0.0122
Time of Perihelion: 2440357.6940 +/-       5.7
Perihelion:          35.81218719 +/-    0.0338
Aphelion:            50.74893241 +/-    0.0353
Period (y)              284.7394 +/-      0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -34.75314483 +/-    0.0011
Ecliptic Y           19.73303448 +/-    0.0006
Ecliptic Z           -6.59272398 +/-    0.0002
Ecliptic XDOT        -0.00140681 +/-    0.0000
Ecliptic YDOT        -0.00200434 +/-    0.0000
Ecliptic ZDOT        -0.00133329 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.50478657 +/-    0.0010
Geocenter to KBO     39.72151432 +/-    0.0012
# Hcoef:  8.97

The following table shows the complete astrometric record for 17BJ230. 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 (17BJ230) followed by the observatory code and reference code for the source of the astrometry.

2016 01  15.610219 09 59 36.12   +02 05 08.0         17BJ230   T09  C~81Bm      
2016 01  15.664261 09 59 35.88   +02 05 08.5         17BJ230   T09  C~81Bm      
2016 03  04.422338 09 55 41.06   +02 18 30.0         17BJ230   T09  C~81Bm      
2016 12  25.51821  10 04 35.85   +01 01 05.8   26.1r 17BJ230   T09  C~7ujA      
2016 12  25.54616  10 04 35.76   +01 01 05.6   25.6r 17BJ230   T09  C~7ujA      
2016 12  25.61625  10 04 35.60   +01 01 04.8   25.5i 17BJ230   T09  C~7ujA      
2017 01  21.44099  10 02 59.70   +01 01 41.9   25.1z 17BJ230   T09  C~7ujA      
2017 01  21.51187  10 02 59.36   +01 01 43.0   24.5z 17BJ230   T09  C~7ujA      
2017 01  21.53790  10 02 59.26   +01 01 43.0   25.0z 17BJ230   T09  C~7ujA      
2017 01  21.56003  10 02 59.16   +01 01 43.2   24.4z 17BJ230   T09  C~7ujA      
2017 01  23.36273  10 02 51.19   +01 02 00.0   24.8r 17BJ230   T09  C~7ujA      
2017 01  23.39642  10 02 51.05   +01 02 00.5   25.4r 17BJ230   T09  C~7ujA      
2017 01  23.41024  10 02 50.96   +01 02 00.7   25.2r 17BJ230   T09  C~7ujA      
2017 01  23.52068  10 02 50.47   +01 02 01.7   25.3i 17BJ230   T09  C~7ujA      
2017 01  23.59193  10 02 50.13   +01 02 02.3   25.5i 17BJ230   T09  C~7ujA      
2017 01  30.43912  10 02 18.50   +01 03 22.4   24.3i 17BJ230   T09  C~7ujA      
2017 01  30.46126  10 02 18.41   +01 03 22.6   24.8i 17BJ230   T09  C~7ujA      
2017 01  30.50547  10 02 18.19   +01 03 23.4   24.2z 17BJ230   T09  C~7ujA      
2017 01  30.56834  10 02 17.88   +01 03 24.1   24.5z 17BJ230   T09  C~7ujA      
2017 01  30.59415  10 02 17.76   +01 03 24.2   24.4z 17BJ230   T09  C~7ujA      
2017 01  30.61597  10 02 17.63   +01 03 24.6   23.8z 17BJ230   T09  C~7ujA      
2017 03  04.34360  09 59 35.97   +01 13 53.0   24.5z 17BJ230   T09  C~7ujA      
2017 03  04.45601  09 59 35.42   +01 13 55.7   24.3i 17BJ230   T09  C~7ujA      
2017 03  04.47782  09 59 35.32   +01 13 56.2   24.4i 17BJ230   T09  C~7ujA      
2017 03  04.49952  09 59 35.21   +01 13 56.5   24.5i 17BJ230   T09  C~7ujA      
2017 03  22.39100  09 58 15.41   +01 21 05.1   24.2z 17BJ230   T09  C~7ujA      
2017 03  22.41670  09 58 15.30   +01 21 05.6   24.8z 17BJ230   T09  C~7ujA      
2017 03  22.44235  09 58 15.18   +01 21 06.3   24.8z 17BJ230   T09  C~7ujA      
2017 03  25.24634  09 58 04.11   +01 22 13.1   24.8r 17BJ230   T09  C~7ujA      
2017 03  25.27375  09 58 04.00   +01 22 13.9   25.8r 17BJ230   T09  C~7ujA      
2017 03  25.28747  09 58 03.94   +01 22 14.6   25.5r 17BJ230   T09  C~7ujA      
2018 01  17.45108  10 07 06.91   -00 02 32.7   25.1i 17BJ230   T09  C~81Bm      
2018 01  17.48332  10 07 06.78   -00 02 32.7   24.9i 17BJ230   T09  C~81Bm      
2018 01  17.50222  10 07 06.71   -00 02 32.5   25.0i 17BJ230   T09  C~81Bm      
2018 01  17.51028  10 07 06.66   -00 02 32.5   25.2i 17BJ230   T09  C~81Bm      
2018 01  17.57223  10 07 06.42   -00 02 32.2   25.3i 17BJ230   T09  C~81Bm      

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     0.13       0.00     0.08
     2   0.0001     -3.55    -0.11      -0.79     0.16
     3   0.1336  -3582.20     0.05    -476.88    -0.08
     4   0.9443   5554.72    -0.18   -2030.98     0.05
     5   0.9444   5553.53    -0.38   -2031.64    -0.04
     6   0.9446   5551.56     0.14   -2033.23    -0.21
     7   1.0180   4190.21     0.24   -2501.07    -0.23
     8   1.0182   4185.04    -0.25   -2501.82     0.09
     9   1.0183   4183.64     0.07   -2502.35    -0.04
    10   1.0183   4182.16     0.05   -2502.68    -0.04
    11   1.0233   4064.24     0.19   -2528.69    -0.14
    12   1.0234   4062.10     0.31   -2528.96     0.09
    13   1.0234   4060.76    -0.09   -2529.24     0.01
    14   1.0237   4053.53     0.13   -2530.87    -0.01
    15   1.0239   4048.54    -0.04   -2532.09    -0.19
    16   1.0427   3575.88    -0.10   -2622.72     0.12
    17   1.0427   3574.54     0.17   -2623.00     0.12
    18   1.0428   3571.17     0.00   -2623.40     0.29
    19   1.0430   3566.57    -0.04   -2624.37     0.13
    20   1.0431   3564.85     0.11   -2624.90    -0.08
    21   1.0431   3562.88    -0.28   -2625.21    -0.10
    22   1.1327   1071.08    -0.04   -2882.68     0.03
    23   1.1330   1062.41    -0.07   -2883.02     0.10
    24   1.1331   1060.83     0.03   -2883.08     0.13
    25   1.1332   1059.18     0.04   -2883.37    -0.09
    26   1.1822   -211.99     0.11   -2899.21     0.03
    27   1.1822   -213.71     0.09   -2899.32    -0.10
    28   1.1823   -215.64    -0.14   -2899.29    -0.10
    29   1.1900   -394.54     0.05   -2894.59    -0.26
    30   1.1900   -396.36    -0.02   -2894.42    -0.13
    31   1.1901   -397.45    -0.24   -2894.07     0.19
    32   2.0064   9018.06    -0.12   -4820.24     0.12
    33   2.0065   9016.23     0.01   -4820.92    -0.03
    34   2.0065   9015.18     0.10   -4821.10     0.11
    35   2.0066   9014.47    -0.11   -4821.36    -0.02
    36   2.0067   9010.99     0.19   -4822.34     0.03

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.

17BJ230    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        43.123    43.161    43.085
ecceobj         0.175     0.177     0.174
incobj         29.142    29.141    29.142
qmin           34.648    33.215    34.967
qmax           51.949    53.428    51.511
amean          43.128    43.127    43.052
amin           42.739    42.763    42.678
amax           43.552    43.556    43.463
emean           0.174     0.194     0.166
emin            0.157     0.154     0.147
emax            0.194     0.228     0.186
imean          30.501    30.118    30.600
imin           30.123    29.504    30.166
imax           30.888    30.997    31.026
excite_mean     0.537     0.538     0.536
fracstop        1.000     1.000     1.000
cjmean          2.727     2.727     2.728

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       178.8     177.8     191.9
kozaiamp        180.0     179.9     179.9