Orbit Fit and Astrometric record for 17BL235

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: 17BL235   
# Created Tue Apr  1 01:11:01 2025
# Orbit generated from Bernstein formalism
# Fitting     26 observations of     26
# Arc:   0.90y
# First observation: 2016/04/02
#  Last observation: 2017/02/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000046   0.023671  -0.000000   0.000441   0.023892   0.000000
# Chi-squared of fit:    10.33 DOF:     46 RMS:  0.11
# Min/Max residuals:    -0.29    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.496361E-05  2.367083E-02  4.313404E-07  4.469887E-04  2.428000E-02  9.966633E-04
# Covariance matrix:
  2.8267E-13  3.1916E-12  9.4661E-15  1.9521E-14  1.4557E-12  1.2324E-10
  3.1916E-12  3.2637E-10  6.4935E-13  1.6482E-12  1.1207E-10  1.0948E-08
  9.4661E-15  6.4935E-13  1.5431E-13 -1.8907E-13  2.3167E-13  2.2084E-11
  1.9521E-14  1.6482E-12 -1.8907E-13  3.9615E-13  5.7410E-13  5.5599E-11
  1.4557E-12  1.1207E-10  2.3167E-13  5.7410E-13  3.9434E-11  3.7936E-09
  1.2324E-10  1.0948E-08  2.2084E-11  5.5599E-11  3.7936E-09  3.6866E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.391973 -174.250121   -0.121870    0.041380   -0.987262  2457480.894196
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:           60.43369 +/-     8.884
Argument of Peri:      359.68246 +/-    11.587
Long of Asc Node:      120.62582 +/-     0.036
Inclination:             2.57084 +/-     0.001
Eccentricity:         0.05058842 +/-    0.0240
Semi-Major Axis:     43.16840108 +/-    0.1209
Time of Perihelion: 2440089.5228 +/-    2555.5
Perihelion:          40.98457993 +/-    1.0443
Aphelion:            45.35222223 +/-    1.0457
Period (y)              283.6333 +/-      1.19
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -41.91788704 +/-    0.0106
Ecliptic Y           -4.34559144 +/-    0.0011
Ecliptic Z            1.71897315 +/-    0.0004
Ecliptic XDOT         0.00015789 +/-    0.0001
Ecliptic YDOT        -0.00267375 +/-    0.0000
Ecliptic ZDOT         0.00005506 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.17758039 +/-    0.0105
Geocenter to KBO     41.18615618 +/-    0.0107
# Hcoef:  8.46

The following table shows the complete astrometric record for 17BL235. 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 (17BL235) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.393407 12 24 54.10   -00 05 14.6         17BL235   T09  C~83Eq      
2016 04  02.525980 12 24 53.51   -00 05 10.9         17BL235   T09  C~83Eq      
2016 04  04.34883  12 24 45.45   -00 04 18.9   26.3g 17BL235   T09  C~89UT      
2016 04  04.37012  12 24 45.35   -00 04 18.5   25.9g 17BL235   T09  C~89UT      
2016 04  04.38940  12 24 45.28   -00 04 17.9   25.5g 17BL235   T09  C~89UT      
2016 04  04.41508  12 24 45.15   -00 04 17.2   25.2g 17BL235   T09  C~89UT      
2016 06  04.25539  12 21 34.99   +00 14 11.9   24.0z 17BL235   T09  C~8COq      
2016 06  04.27307  12 21 34.97   +00 14 11.9   24.5z 17BL235   T09  C~8COq      
2016 06  04.28926  12 21 34.96   +00 14 12.0   24.4z 17BL235   T09  C~8COq      
2016 06  04.34327  12 21 34.87   +00 14 12.4   23.9z 17BL235   T09  C~8COq      
2016 06  05.311488 12 21 33.83   +00 14 15.9         17BL235   T09  C~83Eq      
2016 06  05.358251 12 21 33.78   +00 14 16.1         17BL235   T09  C~83Eq      
2017 01  28.62228  12 33 45.68   -01 02 50.2   24.2z 17BL235   T09  C~7zpg      
2017 01  28.64259  12 33 45.65   -01 02 49.9   24.1z 17BL235   T09  C~7zpg      
2017 01  28.64528  12 33 45.64   -01 02 50.1   24.4z 17BL235   T09  C~7zpg      
2017 01  28.64799  12 33 45.64   -01 02 49.9   24.6z 17BL235   T09  C~7zpg      
2017 01  28.65069  12 33 45.63   -01 02 49.7   24.2z 17BL235   T09  C~7zpg      
2017 01  28.65605  12 33 45.64   -01 02 49.7   24.6z 17BL235   T09  C~7zpg      
2017 02  02.60942  12 33 35.92   -01 01 29.8   24.6i 17BL235   T09  C~7zpg      
2017 02  02.61925  12 33 35.89   -01 01 29.8   24.5i 17BL235   T09  C~7zpg      
2017 02  02.62764  12 33 35.87   -01 01 29.5   24.3i 17BL235   T09  C~7zpg      
2017 02  02.63614  12 33 35.86   -01 01 29.3   24.3i 17BL235   T09  C~7zpg      
2017 02  23.56555  12 32 35.35   -00 53 58.1   24.6r 17BL235   T09  C~7zpg      
2017 02  23.59748  12 32 35.25   -00 53 57.1   24.9r 17BL235   T09  C~7zpg      
2017 02  23.60801  12 32 35.19   -00 53 56.7   25.2r 17BL235   T09  C~7zpg      
2017 02  23.63774  12 32 35.08   -00 53 56.1   24.9r 17BL235   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     0.09       0.00    -0.03
     2   0.0004     -9.59     0.23      -0.10    -0.05
     3   0.0054   -141.20    -0.16      -0.20     0.14
     4   0.0054   -142.74    -0.14      -0.43    -0.07
     5   0.0055   -143.94     0.06      -0.29     0.08
     6   0.0055   -146.01    -0.13      -0.42    -0.03
     7   0.1721  -3204.71    -0.06    -110.79     0.01
     8   0.1722  -3204.98    -0.01    -110.91    -0.05
     9   0.1722  -3205.16     0.11    -110.88     0.04
    10   0.1723  -3206.56    -0.29    -111.04     0.05
    11   0.1750  -3222.27     0.13    -114.00    -0.06
    12   0.1751  -3223.04     0.16    -114.12    -0.02
    13   0.8247   8694.97    -0.08     -19.04     0.00
    14   0.8248   8694.43     0.02     -18.94     0.04
    15   0.8248   8694.37     0.05     -19.18    -0.21
    16   0.8248   8694.29     0.05     -19.00    -0.03
    17   0.8248   8694.08    -0.08     -18.87     0.08
    18   0.8248   8694.22     0.23     -18.81     0.13
    19   0.8384   8528.44     0.01      -3.06     0.03
    20   0.8384   8528.02    -0.03      -3.23    -0.17
    21   0.8384   8527.63    -0.11      -3.08    -0.04
    22   0.8384   8527.41    -0.01      -2.95     0.07
    23   0.8957   7513.90     0.05      52.60    -0.14
    24   0.8958   7512.13     0.19      52.93     0.13
    25   0.8959   7511.14    -0.16      52.94     0.12
    26   0.8959   7509.39    -0.14      52.84    -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.

17BL235    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        42.735    43.406    42.469
ecceobj         0.048     0.116     0.017
incobj          2.573     2.574     2.572
qmin           39.371    36.572    41.333
qmax           46.692    51.131    44.129
amean          42.931    43.617    42.674
amin           42.594    43.234    42.349
amax           43.281    44.054    42.995
emean           0.058     0.122     0.014
emin            0.038     0.091     0.001
emax            0.080     0.161     0.027
imean           1.874     1.875     1.918
imin            0.739     0.408     0.758
imax            2.865     3.163     2.866
excite_mean     0.067     0.127     0.038
fracstop        1.000     1.000     1.000
cjmean          3.083     3.077     3.084

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       182.6     181.0     176.7
kozaiamp        180.0     180.0     179.9