Orbit Fit and Astrometric record for 17BH231

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: 17BH231   
# Created Tue Apr  1 01:11:01 2025
# Orbit generated from Bernstein formalism
# Fitting     36 observations of     41
# Arc:   2.37y
# First observation: 2016/12/23
#  Last observation: 2019/05/09
Preliminary a, adot, b, bdot, g, gdot:
   0.000028   0.024183   0.000004  -0.000496   0.024554   0.000000
# Chi-squared of fit:    20.14 DOF:     66 RMS:  0.13
# Min/Max residuals:    -0.32    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.529223E-05  2.394176E-02 -1.041648E-06 -4.874359E-04  2.424198E-02 -2.341705E-03
# Covariance matrix:
  2.8388E-13  2.5711E-12  6.6205E-14 -1.1006E-13  1.4342E-12  1.2865E-10
  2.5711E-12  3.5347E-11  7.8146E-13 -1.4609E-12  1.7789E-11  1.8013E-09
  6.6205E-14  7.8146E-13  7.1971E-14 -6.6324E-14  4.2060E-13  3.8956E-11
 -1.1006E-13 -1.4609E-12 -6.6324E-14  1.4925E-13 -7.4373E-13 -7.4391E-11
  1.4342E-12  1.7789E-11  4.2060E-13 -7.4373E-13  9.3482E-12  8.9507E-10
  1.2865E-10  1.8013E-09  3.8956E-11 -7.4391E-11  8.9507E-10  9.2526E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   -9.666753  152.342565    0.861188   -0.080923   -0.476254  2457745.976620
# Heliocentric elements and errors
Epoch:              2457740.5000  =  2016/12/18
Mean Anomaly:          297.71669 +/-     0.556
Argument of Peri:      338.01606 +/-     1.708
Long of Asc Node:      249.37311 +/-     0.009
Inclination:             9.65053 +/-     0.000
Eccentricity:         0.12776745 +/-    0.0125
Semi-Major Axis:     43.72988956 +/-    0.1190
Time of Perihelion: 2476014.5663 +/-     144.9
Perihelion:          38.14263301 +/-    0.5575
Aphelion:            49.31714611 +/-    0.5640
Period (y)              289.1850 +/-      1.18
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -36.05043233 +/-    0.0045
Ecliptic Y           19.85865446 +/-    0.0024
Ecliptic Z           -6.92680358 +/-    0.0009
Ecliptic XDOT        -0.00101347 +/-    0.0000
Ecliptic YDOT        -0.00252701 +/-    0.0000
Ecliptic ZDOT        -0.00000991 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.73703914 +/-    0.0041
Geocenter to KBO     41.25076353 +/-    0.0052
# Hcoef:  9.24

The following table shows the complete astrometric record for 17BH231. 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 (17BH231) followed by the observatory code and reference code for the source of the astrometry.

2016 12  23.475831 10 03 28.41   +01 36 07.7         17BH231   T09  C~81Bm      
2017 01  02.526894 10 03 02.69   +01 36 19.6         17BH231   T09  C~81Bm      
2017 01  02.549453 10 03 02.62   +01 36 19.9         17BH231   T09  C~81Bm      
2017 01  02.586101 10 03 02.50   +01 36 20.1         17BH231   T09  C~81Bm      
2017 01  02.635162 10 03 02.34   +01 36 20.4         17BH231   T09  C~81Bm      
2017 01  21.48580  10 01 55.58   +01 39 17.2   25.8z 17BH231   T09  C~7xTl      
2017 01  21.51187  10 01 55.47   +01 39 17.7   24.8z 17BH231   T09  C~7xTl      
2017 01  21.51563  10 01 55.45   +01 39 17.9   25.8z 17BH231   T09  C~7xTl      
2017 01  21.52330  10 01 55.43   +01 39 17.6   24.7z 17BH231   T09  C~7xTl      
2017 01  21.53790  10 01 55.37   +01 39 17.7   25.2z 17BH231   T09  C~7xTl      
2017 01  21.54162  10 01 55.36   +01 39 18.1   24.5z 17BH231   T09  C~7xTl      
2017 01  21.54547  10 01 55.34   +01 39 18.1   24.9z 17BH231   T09  C~7xTl      
2017 01  21.56003  10 01 55.28   +01 39 18.4   25.2z 17BH231   T09  C~7xTl      
2017 01  21.57598  10 01 55.21   +01 39 18.1   24.8z 17BH231   T09  C~7xTl      
2017 01  21.58402  10 01 55.17   +01 39 18.7   24.8z 17BH231   T09  C~7xTl      
2017 01  21.60021  10 01 55.12   +01 39 18.7   25.2z 17BH231   T09  C~7xTl      
2017 01  23.35198  10 01 47.97   +01 39 44.4   25.9r 17BH231   T09  C~7xTl      
2017 01  23.41024  10 01 47.69   +01 39 45.5   26.4r 17BH231   T09  C~7xTl      
2017 01  23.56544  10 01 47.06   +01 39 48.1   25.9i 17BH231   T09  C~7xTl      
2017 01  23.59193  10 01 46.92   +01 39 48.5   26.2i 17BH231   T09  C~7xTl      
2017 01  30.39870  10 01 17.77   +01 41 43.6   24.8i 17BH231   T09  C~7xTl      
2017 01  30.41709  10 01 17.68   +01 41 43.9   25.2i 17BH231   T09  C~7xTl      
2017 01  30.44278  10 01 17.61   +01 41 44.8   25.4i 17BH231   T09  C~7xTl      
2017 01  30.50920  10 01 17.27   +01 41 45.6   25.9z 17BH231   T09  C~7xTl      
2017 01  30.54618  10 01 17.11   +01 41 46.3   24.8z 17BH231   T09  C~7xTl      
2017 01  30.56834  10 01 17.02   +01 41 46.9   24.9z 17BH231   T09  C~7xTl      
2017 01  30.57591  10 01 16.99   +01 41 46.9   25.8z 17BH231   T09  C~7xTl      
2017 01  30.57975  10 01 16.96   +01 41 46.8   24.9z 17BH231   T09  C~7xTl      
2017 01  30.59415  10 01 16.89   +01 41 47.1   24.9z 17BH231   T09  C~7xTl      
2017 01  30.60170  10 01 16.90   +01 41 47.4   25.4z 17BH231   T09  C~7xTl      
2017 02  02.42933  10 01 04.34   +01 42 41.5   25.5r 17BH231   T09  C~7xTl      
2017 02  02.44070  10 01 04.29   +01 42 41.4   24.8r 17BH231   T09  C~7xTl      
2017 02  02.47020  10 01 04.12   +01 42 42.2   25.3r 17BH231   T09  C~7xTl      
2017 02  02.47353  10 01 04.10   +01 42 42.4   24.9r 17BH231   T09  C~7xTl      
2018 01  17.461210 10 07 21.69   +01 07 21.6         17BH231   T09  C~81Bm      
2018 01  17.518288 10 07 21.47   +01 07 22.2         17BH231   T09  C~81Bm      
2018 01  17.545345 10 07 21.37   +01 07 22.5         17BH231   T09  C~81Bm      
2018 01  17.572223 10 07 21.26   +01 07 22.6         17BH231   T09  C~81Bm      
2019 05  09.256100 10 06 06.73   +01 20 22.4         17BH231   T09  C~81Bm      
2019 05  09.305828 10 06 06.72   +01 20 22.9         17BH231   T09  C~81Bm      
2019 05  09.378044 10 06 06.69   +01 20 24.1         17BH231   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     0.07       0.00     0.15
     2   0.0275   -365.10     0.25    -124.78    -0.12
     3   0.0276   -366.19     0.16    -124.87     0.07
     4   0.0277   -367.94     0.01    -125.32     0.06
     5   0.0278   -370.29    -0.18    -125.88     0.09
     6   0.0794  -1369.41    -0.08    -313.13     0.02
     7   0.0795  -1371.13    -0.16    -313.24     0.13
     8   0.0795  -1371.48    -0.27    -313.16     0.25
     9   0.0795  -1371.65     0.04    -313.54    -0.08
    10   0.0796  -1372.53     0.09    -313.77    -0.17
    11   0.0796  -1372.81     0.04    -313.45     0.18
    12   0.0796  -1373.09     0.00    -313.55     0.11
    13   0.0796  -1374.04    -0.02    -313.59     0.19
    14   0.0797  -1374.92     0.11    -314.24    -0.32
    15   0.0797  -1375.69    -0.16    -313.89     0.09
    16   0.0797  -1376.39     0.16    -314.15    -0.03
    17   0.0845  -1485.78 (   0.54)   -327.87 (  -0.14)
    18   0.0847  -1490.10    -0.03    -328.32    -0.13
    19   0.0851  -1499.86     0.26    -329.21     0.22
    20   0.0852  -1501.96    -0.13    -329.58     0.07
    21   0.1038  -1951.59    -0.08    -375.81    -0.06
    22   0.1039  -1952.96    -0.17    -376.00    -0.13
    23   0.1039  -1954.26 (   0.31)   -375.53 (   0.50)
    24   0.1041  -1959.31    -0.12    -376.58    -0.12
    25   0.1042  -1961.80    -0.04    -376.77    -0.07
    26   0.1043  -1963.28     0.02    -376.68     0.15
    27   0.1043  -1963.70     0.13    -376.84     0.04
    28   0.1043  -1964.08     0.01    -377.09    -0.18
    29   0.1044  -1965.17    -0.08    -377.18    -0.18
    30   0.1044  -1965.14 (   0.48)   -376.84 (   0.20)
    31   0.1121  -2160.46 (   0.60)   -392.54 (   0.23)
    32   0.1122  -2161.13 (   0.75)   -392.90 (  -0.07)
    33   0.1122  -2163.79     0.18    -393.04    -0.05
    34   0.1122  -2164.15     0.06    -392.96     0.05
    35   1.0677   3882.64    -0.10    -381.55    -0.01
    36   1.0679   3879.34    -0.06    -382.16    -0.07
    37   1.0680   3877.83     0.01    -382.40    -0.06
    38   1.0680   3876.25     0.00    -382.89    -0.30
    39   2.3731   2554.99    -0.09     -47.49     0.22
    40   2.3733   2554.67     0.13     -47.08    -0.01
    41   2.3734   2553.82     0.03     -46.11    -0.01

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.

17BH231    quality flag:2

Type:      CLASSICAL    7:4EEE CLASSICAL

axisobj        43.475    43.731    43.327
ecceobj         0.121     0.154     0.090
incobj          9.635     9.634     9.636
qmin           37.000    35.788    38.721
qmax           50.528    52.183    48.269
amean          43.575    43.726    43.391
amin           43.192    43.280    43.056
amax           43.980    44.208    43.759
emean           0.125     0.152     0.089
emin            0.105     0.113     0.075
emax            0.149     0.182     0.104
imean          11.321    11.425    11.245
imin           10.486     9.935    10.563
imax           12.145    12.992    11.872
excite_mean     0.233     0.251     0.215
fracstop        1.000     1.000     1.000
cjmean          3.031     3.022     3.039

libcent 0      -180.0     182.1    -180.0
libamp  0      -180.0     149.8    -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       175.0     143.9     175.2
kozaiamp        180.0     180.0     180.0