Orbit Fit and Astrometric record for 17BM235

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: 17BM235   
# Created Tue Apr  1 01:11:01 2025
# Orbit generated from Bernstein formalism
# Fitting     19 observations of     19
# Arc:   0.90y
# First observation: 2016/04/02
#  Last observation: 2017/02/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000042   0.024682  -0.000001  -0.001226   0.024068   0.000000
# Chi-squared of fit:     5.66 DOF:     32 RMS:  0.10
# Min/Max residuals:    -0.19    0.16
# Exact a, adot, b, bdot, g, gdot:
  1.542826E-05  2.465975E-02 -1.485537E-06 -1.234487E-03  2.450913E-02  1.176211E-03
# Covariance matrix:
  3.3620E-13  4.3050E-12  1.5427E-14 -2.0710E-13  1.9178E-12  1.5965E-10
  4.3050E-12  5.1313E-10  1.4768E-12 -2.2052E-11  1.7876E-10  1.6810E-08
  1.5427E-14  1.4768E-12  2.4146E-13 -3.5151E-13  5.2697E-13  4.8770E-11
 -2.0710E-13 -2.2052E-11 -3.5151E-13  1.4717E-12 -7.7420E-12 -7.2462E-10
  1.9178E-12  1.7876E-10  5.2697E-13 -7.7420E-12  6.4063E-11  5.9112E-09
  1.5965E-10  1.6810E-08  4.8770E-11 -7.2462E-10  5.9112E-09  5.5264E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.506036 -174.299508   -0.122722    0.043340   -0.987072  2457480.894196
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:           28.66561 +/-    12.270
Argument of Peri:      104.87648 +/-    15.609
Long of Asc Node:       46.34517 +/-     0.025
Inclination:             3.76599 +/-     0.002
Eccentricity:         0.09655522 +/-    0.0190
Semi-Major Axis:     45.53893029 +/-    0.1859
Time of Perihelion: 2448542.6844 +/-    3825.4
Perihelion:          41.14190889 +/-    0.8819
Aphelion:            49.93595168 +/-    0.8895
Period (y)              307.3141 +/-      1.88
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -41.53518198 +/-    0.0132
Ecliptic Y           -4.27175633 +/-    0.0013
Ecliptic Z            1.78397718 +/-    0.0006
Ecliptic XDOT         0.00013711 +/-    0.0001
Ecliptic YDOT        -0.00276167 +/-    0.0000
Ecliptic ZDOT        -0.00013202 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.79236556 +/-    0.0132
Geocenter to KBO     40.80112590 +/-    0.0133
# Hcoef:  8.98

The following table shows the complete astrometric record for 17BM235. 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 (17BM235) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.393407 12 24 54.06   +00 02 12.8         17BM235   T09  C~83Eq      
2016 04  02.444565 12 24 53.83   +00 02 14.2         17BM235   T09  C~83Eq      
2016 04  04.37012  12 24 45.22   +00 03 07.1   25.5g 17BM235   T09  C~89UT      
2016 04  04.38940  12 24 45.14   +00 03 07.6   26.1g 17BM235   T09  C~89UT      
2016 04  04.41508  12 24 45.03   +00 03 08.3   25.9g 17BM235   T09  C~89UT      
2016 06  05.311488 12 21 32.01   +00 20 41.5         17BM235   T09  C~83Eq      
2016 06  05.358251 12 21 31.96   +00 20 41.6         17BM235   T09  C~83Eq      
2017 01  28.62228  12 33 50.90   -01 01 11.0   24.8z 17BM235   T09  C~7zpg      
2017 01  28.64259  12 33 50.87   -01 01 10.6   24.7z 17BM235   T09  C~7zpg      
2017 01  28.64528  12 33 50.87   -01 01 10.6   24.8z 17BM235   T09  C~7zpg      
2017 01  28.65069  12 33 50.86   -01 01 10.5   24.2z 17BM235   T09  C~7zpg      
2017 01  28.65605  12 33 50.85   -01 01 10.6   24.8z 17BM235   T09  C~7zpg      
2017 02  02.60942  12 33 41.07   -00 59 54.9   25.1i 17BM235   T09  C~7zpg      
2017 02  02.61925  12 33 41.05   -00 59 54.5   25.3i 17BM235   T09  C~7zpg      
2017 02  02.62764  12 33 41.02   -00 59 54.4   24.8i 17BM235   T09  C~7zpg      
2017 02  02.63614  12 33 41.00   -00 59 54.4   24.6i 17BM235   T09  C~7zpg      
2017 02  23.52446  12 32 40.14   -00 52 41.1   25.5r 17BM235   T09  C~7zpg      
2017 02  23.56555  12 32 39.99   -00 52 40.0   25.8r 17BM235   T09  C~7zpg      
2017 02  23.60801  12 32 39.84   -00 52 38.8   25.6r 17BM235   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     0.10       0.00     0.14
     2   0.0001     -3.72     0.15      -0.08     0.14
     3   0.0054   -143.26    -0.19      -2.62    -0.16
     4   0.0055   -144.56    -0.08      -2.63    -0.14
     5   0.0055   -146.36     0.01      -2.64    -0.11
     6   0.1750  -3222.32    -0.02    -181.40     0.07
     7   0.1751  -3223.05     0.03    -181.60     0.07
     8   0.8247   8905.67    -0.10    -307.16    -0.07
     9   0.8248   8905.10    -0.04    -306.97     0.08
    10   0.8248   8905.10     0.05    -306.97     0.07
    11   0.8248   8904.92     0.04    -306.94     0.09
    12   0.8248   8904.82     0.11    -307.09    -0.07
    13   0.8384   8739.86     0.09    -295.56    -0.07
    14   0.8384   8739.43     0.03    -295.31     0.16
    15   0.8384   8738.97    -0.11    -295.40     0.06
    16   0.8384   8738.70    -0.07    -295.52    -0.08
    17   0.8956   7727.36     0.02    -258.54    -0.18
    18   0.8957   7724.85    -0.02    -258.42    -0.09
    19   0.8959   7722.31    -0.01    -258.21     0.09

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.

17BM235    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.043    46.108    44.646
ecceobj         0.088     0.160     0.064
incobj          3.776     3.771     3.780
qmin           40.253    37.806    41.168
qmax           50.573    55.190    48.804
amean          45.259    46.313    44.875
amin           44.901    45.917    44.521
amax           45.649    46.769    45.246
emean           0.093     0.165     0.065
emin            0.079     0.151     0.051
emax            0.108     0.181     0.079
imean           2.946     3.048     2.886
imin            2.374     2.327     2.334
imax            3.480     3.756     3.386
excite_mean     0.106     0.174     0.082
fracstop        1.000     1.000     1.000
cjmean          3.103     3.093     3.104

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       182.5     183.0     186.2
kozaiamp        180.0     180.0     180.0