Orbit Fit and Astrometric record for 19SK235

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: 19SK235   
# Created Tue Apr  1 01:11:16 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.10y
# First observation: 2019/08/28
#  Last observation: 2021/10/04
Preliminary a, adot, b, bdot, g, gdot:
   0.000017   0.024168  -0.000000  -0.000054   0.024416   0.000000
# Chi-squared of fit:    10.24 DOF:     10 RMS:  0.20
# Min/Max residuals:    -0.45    0.45
# Exact a, adot, b, bdot, g, gdot:
  1.541928E-05  2.410419E-02 -2.886801E-07 -5.405502E-05  2.433425E-02 -8.642838E-04
# Covariance matrix:
  7.4078E-13  1.6098E-12  3.5336E-16 -4.7957E-15  1.7139E-12  4.0825E-11
  1.6098E-12  1.8658E-11  2.9418E-15 -5.1151E-14  1.0386E-11  4.3136E-10
  3.5336E-16  2.9418E-15  3.8279E-13 -1.8914E-13  1.9108E-15  6.8243E-14
 -4.7957E-15 -5.1151E-14 -1.8914E-13  1.7922E-13 -2.8042E-14 -1.1952E-12
  1.7139E-12  1.0386E-11  1.9108E-15 -2.8042E-14  8.5382E-12  2.3795E-10
  4.0825E-11  4.3136E-10  6.8243E-14 -1.1952E-12  2.3795E-10  1.0077E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.911965   -7.786448    0.302616   -0.015243   -0.957835  2458723.711696
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:          322.29416 +/-     2.581
Argument of Peri:      303.64917 +/-     3.052
Long of Asc Node:       90.48741 +/-     0.064
Inclination:             0.90146 +/-     0.000
Eccentricity:         0.06232757 +/-    0.0028
Semi-Major Axis:     44.16610358 +/-    0.0192
Time of Perihelion: 2469949.4239 +/-     768.6
Perihelion:          41.41333774 +/-    0.1267
Aphelion:            46.91886942 +/-    0.1271
Period (y)              293.5228 +/-      0.19
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           41.62123693 +/-    0.0049
Ecliptic Y           -6.00339101 +/-    0.0007
Ecliptic Z           -0.65407216 +/-    0.0001
Ecliptic XDOT         0.00027945 +/-    0.0000
Ecliptic YDOT         0.00270071 +/-    0.0000
Ecliptic ZDOT        -0.00000476 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.05705503 +/-    0.0048
Geocenter to KBO     41.09434053 +/-    0.0049
# Hcoef:  9.15

The following table shows the complete astrometric record for 19SK235. 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 (19SK235) followed by the observatory code and reference code for the source of the astrometry.

2019 08  28.210895 23 32 50.376  -03 55 37.58  25.3r 19SK235   W84  C~7XM7      
2019 08  28.388381 23 32 49.620  -03 55 42.56  25.3r 19SK235   W84  C~7XM7      
2019 09  29.013696 23 30 31.528  -04 10 32.39  25.2r 19SK235   W84  C~7XM7      
2019 09  29.177510 23 30 30.814  -04 10 36.75  25.2r 19SK235   W84  C~7XM7      
2021 09  06.108763 23 42 23.414  -02 54 22.60  25.4r 19SK235   W84  C~7XM7      
2021 09  06.196686 23 42 22.988  -02 54 26.00  25.4r 19SK235   W84  C~7XM7      
2021 10  04.002582 23 40 21.139  -03 07 32.34  25.2r 19SK235   W84  C~7XM7      
2021 10  04.175328 23 40 20.396  -03 07 36.80  25.2r 19SK235   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     0.05       0.00     0.05
     2   0.0005    -12.36    -0.05      -0.11    -0.06
     3   0.0871  -2262.11    -0.03      -2.13    -0.05
     4   0.0875  -2273.65     0.03      -1.93     0.05
     5   2.0257   9340.41     0.45     -25.60     0.37
     6   2.0260   9333.19    -0.45     -26.19    -0.23
     7   2.1021   7342.55    -0.03     -23.06    -0.15
     8   2.1026   7330.55     0.04     -22.74     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.

19SK235    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.247    44.285    44.209
ecceobj         0.067     0.066     0.067
incobj          0.901     0.901     0.901
qmin           40.179    40.285    40.109
qmax           48.276    48.253    48.252
amean          44.113    44.151    44.076
amin           43.765    43.795    43.716
amax           44.483    44.527    44.454
emean           0.069     0.069     0.070
emin            0.053     0.052     0.053
emax            0.086     0.084     0.086
imean           0.949     0.944     0.954
imin            0.077     0.091     0.066
imax            1.547     1.530     1.562
excite_mean     0.072     0.071     0.072
fracstop        1.000     1.000     1.000
cjmean          3.097     3.097     3.096

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       206.0     204.3     207.9
kozaiamp        180.0     179.9     179.9