Orbit Fit and Astrometric record for 17BK235

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: 17BK235   
# Created Tue Apr  1 01:11:01 2025
# Orbit generated from Bernstein formalism
# Fitting     53 observations of     53
# Arc:   4.05y
# First observation: 2015/03/18
#  Last observation: 2019/04/05
Preliminary a, adot, b, bdot, g, gdot:
  -0.000283   0.013690  -0.000045   0.001990   0.017373   0.000000
# Chi-squared of fit:   534.50 DOF:    100 RMS:  0.56
# Min/Max residuals:    -5.41    0.56
# Exact a, adot, b, bdot, g, gdot:
  1.209486E-05  1.325540E-02  1.291484E-06  1.931913E-03  1.728960E-02 -6.434215E-03
# Covariance matrix:
  2.0458E-13 -1.3777E-13  1.0571E-14 -1.3691E-14 -7.6952E-14 -1.5444E-12
 -1.3777E-13  1.7757E-13 -1.7241E-14  2.1889E-14  1.0015E-14  2.4728E-12
  1.0571E-14 -1.7241E-14  1.1629E-13 -4.1232E-14 -9.1886E-16 -2.6590E-13
 -1.3691E-14  2.1889E-14 -4.1232E-14  2.0250E-14  1.8229E-15  3.3777E-13
 -7.6952E-14  1.0015E-14 -9.1886E-16  1.8229E-15  1.7252E-13  2.0044E-13
 -1.5444E-12  2.4728E-12 -2.6590E-13  3.3777E-13  2.0044E-13  3.8156E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   -8.530561  149.942453   -0.455372   -0.130617   -0.871720  2457099.891538
# Heliocentric elements and errors
Epoch:              2457090.5000  =  2015/03/09
Mean Anomaly:          308.05812 +/-     0.039
Argument of Peri:       57.14427 +/-     0.012
Long of Asc Node:      195.21407 +/-     0.002
Inclination:            11.83485 +/-     0.000
Eccentricity:         0.43498163 +/-    0.0004
Semi-Major Axis:     65.55568002 +/-    0.0266
Time of Perihelion: 2485062.8605 +/-      12.2
Perihelion:          37.04016333 +/-    0.0306
Aphelion:            94.07119671 +/-    0.0466
Period (y)              530.7912 +/-      0.32
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -50.50096930 +/-    0.0012
Ecliptic Y           28.69611270 +/-    0.0007
Ecliptic Z           -8.57946440 +/-    0.0002
Ecliptic XDOT        -0.00022193 +/-    0.0000
Ecliptic YDOT        -0.00230447 +/-    0.0000
Ecliptic ZDOT         0.00045376 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   58.71475107 +/-    0.0011
Geocenter to KBO     57.83823571 +/-    0.0014
# Hcoef:  7.50

The following table shows the complete astrometric record for 17BK235. 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 (17BK235) followed by the observatory code and reference code for the source of the astrometry.

2015 03  18.39076  09 56 09.98   +03 29 36.3   25.5r 17BK235   T09  C~8eW4      
2015 03  18.42974  09 56 09.87   +03 29 37.1   25.4r 17BK235   T09  C~8eW4      
2015 03  18.44789  09 56 09.80   +03 29 37.5   24.9r 17BK235   T09  C~8eW4      
2015 03  20.33757  09 56 04.46   +03 30 17.5   25.3i 17BK235   T09  C~8eW4      
2015 03  20.35412  09 56 04.39   +03 30 17.8   25.0i 17BK235   T09  C~8eW4      
2015 03  20.36873  09 56 04.37   +03 30 18.1   24.9i 17BK235   T09  C~8eW4      
2015 03  20.38334  09 56 04.32   +03 30 18.5   24.6i 17BK235   T09  C~8eW4      
2017 01  21.43262  10 05 18.09   +02 52 33.2   24.4z 17BK235   T09  C~7zpf      
2017 01  21.47848  10 05 17.95   +02 52 33.9   24.5z 17BK235   T09  C~7zpf      
2017 01  21.53071  10 05 17.80   +02 52 34.4   25.0z 17BK235   T09  C~7zpf      
2017 01  21.55293  10 05 17.74   +02 52 34.9   25.1z 17BK235   T09  C~7zpf      
2017 01  23.35766  10 05 12.32   +02 52 58.6   25.5r 17BK235   T09  C~7zpf      
2017 01  23.38262  10 05 12.26   +02 52 59.2   25.7r 17BK235   T09  C~7zpf      
2017 01  23.39135  10 05 12.22   +02 52 59.2   25.3r 17BK235   T09  C~7zpf      
2017 01  23.40520  10 05 12.19   +02 52 59.2   24.9r 17BK235   T09  C~7zpf      
2017 01  23.42098  10 05 12.14   +02 52 59.8   24.9r 17BK235   T09  C~7zpg      
2017 01  23.45863  10 05 12.01   +02 52 59.9   25.5r 17BK235   T09  C~7zpg      
2017 01  23.51343  10 05 11.85   +02 53 01.1   24.9i 17BK235   T09  C~7zpg      
2017 01  23.55452  10 05 11.72   +02 53 01.3   24.7i 17BK235   T09  C~7zpg      
2017 01  23.58486  10 05 11.64   +02 53 01.8   25.0i 17BK235   T09  C~7zpg      
2017 01  30.40987  10 04 50.28   +02 54 42.1   24.5i 17BK235   T09  C~7zpg      
2017 01  30.45397  10 04 50.11   +02 54 42.9   25.0i 17BK235   T09  C~7zpg      
2017 01  30.49820  10 04 49.97   +02 54 43.2   24.7z 17BK235   T09  C~7zpg      
2017 01  30.56119  10 04 49.76   +02 54 44.8   24.9z 17BK235   T09  C~7zpg      
2017 02  21.34603  10 03 36.34   +03 01 24.8   24.5z 17BK235   T09  C~7zpg      
2017 02  21.37159  10 03 36.25   +03 01 25.2   24.9z 17BK235   T09  C~7zpg      
2017 02  21.39722  10 03 36.15   +03 01 25.8   24.7z 17BK235   T09  C~7zpg      
2017 02  21.41923  10 03 36.08   +03 01 26.3   25.1z 17BK235   T09  C~7zpg      
2017 02  23.33107  10 03 29.18   +03 02 06.5   25.6g 17BK235   T09  C~81Bn      
2017 02  23.47842  10 03 29.04   +03 02 08.5   25.9r 17BK235   T09  C~81Bn      
2017 02  23.49203  10 03 29.00   +03 02 08.5   25.8r 17BK235   T09  C~81Bn      
2017 03  04.28899  10 02 59.41   +03 05 15.7   24.7z 17BK235   T09  C~7zpg      
2017 03  04.31448  10 02 59.36   +03 05 16.2   24.8z 17BK235   T09  C~7zpg      
2017 03  04.34002  10 02 59.26   +03 05 16.7   24.7z 17BK235   T09  C~7zpg      
2017 03  04.45244  10 02 58.88   +03 05 19.2   25.0i 17BK235   T09  C~7zpg      
2017 03  22.38749  10 02 03.81   +03 11 49.4   24.4z 17BK235   T09  C~7zpg      
2017 03  22.43886  10 02 03.65   +03 11 50.6   24.8z 17BK235   T09  C~7zpg      
2017 03  22.48627  10 02 03.54   +03 11 51.9   24.6z 17BK235   T09  C~7zpg      
2019 02  05.36641  10 10 49.38   +02 35 57.5   24.9i 17BK235   T09  C~7zpg      
2019 02  05.38256  10 10 49.34   +02 35 57.5   24.7i 17BK235   T09  C~7zpg      
2019 02  05.39592  10 10 49.28   +02 35 57.6   24.7i 17BK235   T09  C~7zpg      
2019 02  05.40928  10 10 49.24   +02 35 58.0   24.9i 17BK235   T09  C~7zpg      
2019 02  05.41196  10 10 49.23   +02 35 58.0   24.3i 17BK235   T09  C~7zpg      
2019 02  05.42003  10 10 49.20   +02 35 58.0   24.6i 17BK235   T09  C~7zpg      
2019 02  05.43354  10 10 49.16   +02 35 58.5   24.4i 17BK235   T09  C~7zpg      
2019 03  03.28745  10 09 20.65   +02 44 36.0   24.4z 17BK235   T09  C~7zpg      
2019 03  03.29758  10 09 20.62   +02 44 36.2   24.6z 17BK235   T09  C~7zpg      
2019 03  03.32504  10 09 20.53   +02 44 37.1   24.5z 17BK235   T09  C~7zpg      
2019 03  03.32771  10 09 20.52   +02 44 36.9   24.6z 17BK235   T09  C~7zpg      
2019 04  05.34328  10 07 43.70   +02 56 39.0   25.3r 17BK235   T09  C~7zpg      
2019 04  05.36539  10 07 43.66   +02 56 39.3   26.0r 17BK235   T09  C~7zpg      
2019 04  05.36748  10 07 43.64   +02 56 39.7   25.4r 17BK235   T09  C~7zpg      
2019 04  05.37599  10 07 43.63   +02 56 39.7   25.3r 17BK235   T09  C~7zpg      

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     0.10
     2   0.0001     -1.82     0.08       0.18     0.09
     3   0.0002     -2.94    -0.17       0.20     0.02
     4   0.0053    -91.78     0.14      10.17    -0.04
     5   0.0054    -92.87    -0.16      10.09    -0.21
     6   0.0054    -93.26     0.16      10.26    -0.10
     7   0.0055    -94.10     0.01      10.38    -0.06
     8   1.8482   8475.88     0.02     754.91    -0.04
     9   1.8483   8473.67    -0.04     754.84     0.05
    10   1.8484   8471.38     0.14     754.53    -0.07
    11   1.8485   8470.36     0.17     754.69     0.16
    12   1.8534   8385.85     0.01     748.73    -0.14
    13   1.8535   8384.79     0.15     748.98     0.19
    14   1.8535   8384.23     0.00     748.77     0.01
    15   1.8536   8383.81     0.25     748.62    -0.10
    16   1.8536   8382.90     0.09     748.92     0.25
    17   1.8537   8381.03     0.04     748.34    -0.21
    18   1.8539   8378.36     0.02     748.63     0.27
    19   1.8540   8376.46     0.10     748.14    -0.08
    20   1.8541   8375.16     0.26     748.19     0.07
    21   1.8727   8039.72     0.40     731.21     0.14
    22   1.8729   8037.05     0.01     731.07     0.10
    23   1.8730   8034.97     0.22     730.63    -0.24
    24   1.8732   8031.46    -0.04     731.04     0.31
    25   1.9328   6859.64     0.15     724.73     0.21
    26   1.9329   6858.23     0.18     724.64     0.09
    27   1.9329   6856.62     0.00     724.69     0.10
    28   1.9330   6855.46     0.08     724.79     0.18
    29   1.9382   6744.46    -5.41     726.67    -1.01
    30   1.9386   6741.80     0.18     727.82    -0.07
    31   1.9387   6741.23     0.38     727.61    -0.30
    32   1.9628   6260.13     0.04     749.58    -0.01
    33   1.9628   6259.25     0.56     749.79     0.12
    34   1.9629   6257.67     0.37     749.74    -0.00
    35   1.9632   6251.46     0.31     750.11     0.05
    36   2.0123   5341.83     0.48     830.39    -0.01
    37   2.0125   5339.16     0.25     830.69     0.00
    38   2.0126   5337.17     0.50     831.34     0.39
    39   3.8877  13490.79    -0.16    1548.44     0.20
    40   3.8877  13490.22     0.14    1548.23     0.01
    41   3.8878  13489.34    -0.02    1548.01    -0.19
    42   3.8878  13488.64    -0.01    1548.18    -0.00
    43   3.8878  13488.50    -0.00    1548.12    -0.05
    44   3.8878  13488.07     0.01    1547.97    -0.20
    45   3.8879  13487.34    -0.00    1548.23     0.08
    46   3.9586  12058.44    -0.07    1571.59    -0.10
    47   3.9587  12057.94     0.00    1571.62    -0.10
    48   3.9588  12056.36    -0.04    1572.00     0.20
    49   3.9588  12056.29     0.04    1571.76    -0.04
    50   4.0492  10440.39    -0.01    1744.33    -0.04
    51   4.0492  10439.72     0.22    1744.40    -0.12
    52   4.0492  10439.30    -0.12    1744.68     0.13
    53   4.0492  10439.16     0.08    1744.62     0.02

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.

17BK235    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        64.778    64.851    64.705
ecceobj         0.432     0.433     0.431
incobj         11.882    11.882    11.882
qmin           35.629    35.890    35.888
qmax           97.055    96.454    95.759
amean          65.319    65.376    64.980
amin           64.304    64.493    64.053
amax           66.627    66.533    66.216
emean           0.438     0.435     0.433
emin            0.423     0.422     0.420
emax            0.457     0.450     0.447
imean          11.633    12.148    11.793
imin           10.373    11.296    11.025
imax           12.660    12.962    12.661
excite_mean     0.482     0.484     0.479
fracstop        1.000     1.000     1.000
cjmean          3.055     3.054     3.055

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       176.1     189.3     174.0
kozaiamp        180.0     180.0     180.0