Orbit Fit and Astrometric record for 19SL235

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: 19SL235   
# Created Tue Apr  1 01:11:16 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   1.14y
# First observation: 2019/08/28
#  Last observation: 2020/10/18
Preliminary a, adot, b, bdot, g, gdot:
  -0.000000   0.021448   0.000000   0.000072   0.022969   0.000000
# Chi-squared of fit:     1.09 DOF:     10 RMS:  0.07
# Min/Max residuals:    -0.09    0.17
# Exact a, adot, b, bdot, g, gdot:
  1.474140E-05  2.145040E-02  3.795189E-07  7.232214E-05  2.296325E-02 -1.196949E-03
# Covariance matrix:
  7.4122E-13  1.9824E-12 -8.7837E-16  2.4916E-14  2.0629E-12  2.1384E-10
  1.9824E-12  1.0239E-09 -7.0109E-13  1.8047E-11  4.0652E-10  1.3926E-07
 -8.7837E-16 -7.0109E-13  3.9696E-13 -3.7255E-13 -2.7609E-13 -9.5634E-11
  2.4916E-14  1.8047E-11 -3.7255E-13  9.2910E-13  7.1147E-12  2.4611E-09
  2.0629E-12  4.0652E-10 -2.7609E-13  7.1147E-12  1.6527E-10  5.4972E-08
  2.1384E-10  1.3926E-07 -9.5634E-11  2.4611E-09  5.4972E-08  1.8984E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.949680   -8.358170    0.293042   -0.015923   -0.960797  2458723.711696
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:          261.91973 +/-    47.197
Argument of Peri:       26.14982 +/-    44.676
Long of Asc Node:       69.93573 +/-     0.227
Inclination:             0.94748 +/-     0.001
Eccentricity:         0.06036578 +/-    0.1942
Semi-Major Axis:     43.98594236 +/-    0.8796
Time of Perihelion: 2487750.5942 +/-   13942.5
Perihelion:          41.33069680 +/-    8.5820
Aphelion:            46.64118792 +/-    8.5929
Period (y)              291.7286 +/-      8.75
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           43.99034391 +/-    0.0241
Ecliptic Y           -6.76585419 +/-    0.0036
Ecliptic Z           -0.72175514 +/-    0.0004
Ecliptic XDOT         0.00023918 +/-    0.0005
Ecliptic YDOT         0.00255160 +/-    0.0001
Ecliptic ZDOT         0.00001076 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.51345943 +/-    0.0238
Geocenter to KBO     43.54784086 +/-    0.0244
# Hcoef:  8.50

The following table shows the complete astrometric record for 19SL235. 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 (19SL235) followed by the observatory code and reference code for the source of the astrometry.

2019 08  28.210895 23 30 47.593  -04 11 14.84  24.9r 19SL235   W84  C~7XM7      
2019 08  28.388381 23 30 46.869  -04 11 19.40  24.9r 19SL235   W84  C~7XM7      
2019 09  29.013696 23 28 34.977  -04 25 24.89  24.9r 19SL235   W84  C~7XM7      
2019 09  29.177510 23 28 34.303  -04 25 29.36  24.9r 19SL235   W84  C~7XM7      
2020 10  17.010669 23 31 54.976  -04 03 32.92  24.9r 19SL235   W84  C~7XM7      
2020 10  17.174574 23 31 54.385  -04 03 36.44  24.9r 19SL235   W84  C~7XM7      
2020 10  18.012125 23 31 51.506  -04 03 54.37  24.9r 19SL235   W84  C~7XM7      
2020 10  18.176134 23 31 50.917  -04 03 57.87  24.9r 19SL235   W84  C~7XM7      

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    -0.07
     2   0.0005    -11.75    -0.01       0.08     0.00
     3   0.0871  -2158.17     0.00       0.91     0.17
     4   0.0875  -2169.20    -0.00       0.77    -0.09
     5   1.1384   1108.61     0.04      26.43    -0.04
     6   1.1388   1099.10    -0.06      26.68     0.02
     7   1.1411   1052.44     0.10      27.22    -0.03
     8   1.1416   1042.96    -0.08      27.49     0.04

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.

19SL235    quality flag:1

Type:      CLASSICAL  CENTAURR CLASSICAL

axisobj        44.072    64.342    44.000
ecceobj         0.064     0.586     0.035
incobj          0.948     0.950     0.948
qmin           39.915    26.236    41.173
qmax           48.244   111.439    46.794
amean          43.942    66.138    43.876
amin           43.584    63.624    43.539
amax           44.310    69.132    44.227
emean           0.072     0.595     0.043
emin            0.055     0.579     0.026
emax            0.089     0.612     0.059
imean           0.956     1.263     0.986
imin            0.000     1.022     0.143
imax            1.579     1.558     1.548
excite_mean     0.075     0.596     0.047
fracstop        1.000     0.010     1.000
cjmean          3.094     2.836     3.097

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       178.2     217.5     174.5
kozaiamp        180.0     166.4     180.0