Orbit Fit and Astrometric record for 17BN235

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: 17BN235   
# Created Tue Apr  1 01:11:01 2025
# Orbit generated from Bernstein formalism
# Fitting     23 observations of     23
# Arc:   0.90y
# First observation: 2016/04/02
#  Last observation: 2017/02/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000031   0.020639  -0.000000   0.000813   0.022080   0.000000
# Chi-squared of fit:     7.61 DOF:     40 RMS:  0.10
# Min/Max residuals:    -0.31    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.403678E-05  2.061865E-02  8.135417E-07  8.218610E-04  2.244403E-02  9.049231E-04
# Covariance matrix:
  2.8339E-13  3.0825E-12  2.0182E-15  7.4973E-14  1.4796E-12  1.3475E-10
  3.0825E-12  3.2893E-10  1.0443E-13  6.7131E-12  1.1873E-10  1.2413E-08
  2.0182E-15  1.0443E-13  2.0442E-13 -2.4494E-13  4.3597E-14  4.1352E-12
  7.4973E-14  6.7131E-12 -2.4494E-13  5.7607E-13  2.4686E-12  2.5503E-10
  1.4796E-12  1.1873E-10  4.3597E-14  2.4686E-12  4.4598E-11  4.5409E-09
  1.3475E-10  1.2413E-08  4.1352E-12  2.5503E-10  4.5409E-09  4.7078E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.119206 -173.873678   -0.115375    0.036708   -0.988226  2457480.894196
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          107.88960 +/-    15.851
Argument of Peri:      289.19217 +/-    15.504
Long of Asc Node:      143.92782 +/-     0.025
Inclination:             3.07595 +/-     0.001
Eccentricity:         0.04964270 +/-    0.0296
Semi-Major Axis:     44.76739193 +/-    0.1510
Time of Perihelion: 2424692.2517 +/-    4814.4
Perihelion:          42.54501780 +/-    1.3335
Aphelion:            46.98976606 +/-    1.3352
Period (y)              299.5373 +/-      1.52
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -45.24518326 +/-    0.0132
Ecliptic Y           -4.97464735 +/-    0.0014
Ecliptic Z            1.64765545 +/-    0.0005
Ecliptic XDOT         0.00016253 +/-    0.0001
Ecliptic YDOT        -0.00251917 +/-    0.0000
Ecliptic ZDOT         0.00010428 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.54765079 +/-    0.0131
Geocenter to KBO     44.55528751 +/-    0.0133
# Hcoef:  8.78

The following table shows the complete astrometric record for 17BN235. 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 (17BN235) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.393407 12 25 51.11   -00 29 12.2         17BN235   T09  C~81Bn      
2016 04  02.517894 12 25 50.59   -00 29 08.9         17BN235   T09  C~81Bn      
2016 04  04.34883  12 25 43.02   -00 28 19.7   26.0g 17BN235   T09  C~8COq      
2016 04  04.38940  12 25 42.86   -00 28 18.4   26.0g 17BN235   T09  C~8COq      
2016 04  04.40858  12 25 42.80   -00 28 18.2   26.3g 17BN235   T09  C~8COq      
2016 04  04.41735  12 25 42.76   -00 28 18.0   26.0g 17BN235   T09  C~8COq      
2016 06  05.311488 12 22 42.59   -00 10 17.4         17BN235   T09  C~81Bn      
2016 06  05.351866 12 22 42.54   -00 10 17.2         17BN235   T09  C~81Bn      
2017 01  28.64259  12 33 51.19   -01 19 45.4   24.8z 17BN235   T09  C~7zpg      
2017 01  28.64528  12 33 51.19   -01 19 45.4   24.5z 17BN235   T09  C~7zpg      
2017 01  28.65069  12 33 51.17   -01 19 45.4   25.2z 17BN235   T09  C~7zpg      
2017 01  28.65336  12 33 51.18   -01 19 45.4   25.1z 17BN235   T09  C~7zpg      
2017 01  28.65605  12 33 51.17   -01 19 45.4   24.7z 17BN235   T09  C~7zpg      
2017 02  02.60942  12 33 42.01   -01 18 30.7   25.0i 17BN235   T09  C~7zpg      
2017 02  02.61925  12 33 42.00   -01 18 30.5   25.6i 17BN235   T09  C~7zpg      
2017 02  02.62764  12 33 41.98   -01 18 30.3   24.8i 17BN235   T09  C~7zpg      
2017 02  02.63614  12 33 41.97   -01 18 30.0   25.2i 17BN235   T09  C~7zpg      
2017 02  02.64454  12 33 41.95   -01 18 30.0   25.2i 17BN235   T09  C~7zpg      
2017 02  02.64725  12 33 41.94   -01 18 30.0   25.4i 17BN235   T09  C~7zpg      
2017 02  02.65294  12 33 41.92   -01 18 29.8   24.9i 17BN235   T09  C~7zpg      
2017 02  23.52446  12 32 45.40   -01 11 29.1   25.8r 17BN235   T09  C~7zpg      
2017 02  23.56555  12 32 45.27   -01 11 28.2   25.4r 17BN235   T09  C~7zpg      
2017 02  23.63774  12 32 45.01   -01 11 26.5   25.4r 17BN235   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    -0.05
     2   0.0003     -8.47     0.17      -0.05    -0.07
     3   0.0054   -132.22    -0.31       0.22    -0.07
     4   0.0055   -134.93    -0.26       0.47     0.19
     5   0.0055   -135.84     0.15       0.30     0.03
     6   0.0055   -136.47     0.12       0.24    -0.02
     7   0.1750  -3046.22     0.05     -76.31    -0.01
     8   0.1751  -3046.99    -0.03     -76.42    -0.02
     9   0.8248   7816.55    -0.08      60.17     0.06
    10   0.8248   7816.55     0.00      60.17     0.06
    11   0.8248   7816.27    -0.11      60.05    -0.08
    12   0.8248   7816.41     0.10      60.11    -0.02
    13   0.8248   7816.27     0.05      60.05    -0.09
    14   0.8384   7660.35    -0.06      74.42    -0.15
    15   0.8384   7660.14     0.07      74.55    -0.04
    16   0.8384   7659.78     0.01      74.61     0.00
    17   0.8384   7659.53     0.06      74.83     0.20
    18   0.8385   7659.25     0.08      74.71     0.06
    19   0.8385   7659.11     0.04      74.65    -0.01
    20   0.8385   7658.76    -0.12      74.72     0.04
    21   0.8956   6712.76    -0.04     126.36     0.03
    22   0.8957   6710.61     0.11     126.41     0.02
    23   0.8959   6706.35    -0.11     126.43    -0.08

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.

17BN235    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.320    45.194    44.093
ecceobj         0.055     0.135     0.040
incobj          3.086     3.088     3.085
qmin           41.019    38.219    41.815
qmax           48.225    52.888    46.978
amean          44.527    45.393    44.314
amin           44.177    45.004    43.976
amax           44.894    45.812    44.671
emean           0.059     0.139     0.038
emin            0.044     0.125     0.023
emax            0.075     0.155     0.052
imean           2.501     2.586     2.544
imin            1.964     1.982     1.959
imax            3.086     3.274     3.140
excite_mean     0.073     0.147     0.059
fracstop        1.000     1.000     1.000
cjmean          3.101     3.092     3.101

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       183.9     183.3     175.0
kozaiamp        180.0     180.0     180.0