Orbit Fit and Astrometric record for 19SM235

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: 19SM235   
# Created Tue Apr  1 01:11:16 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.11y
# First observation: 2019/08/28
#  Last observation: 2021/10/07
Preliminary a, adot, b, bdot, g, gdot:
   0.000000   0.023412  -0.000000   0.000626   0.024097   0.000000
# Chi-squared of fit:     1.18 DOF:     10 RMS:  0.07
# Min/Max residuals:    -0.14    0.09
# Exact a, adot, b, bdot, g, gdot:
  1.491918E-05  2.336693E-02 -3.969779E-08  6.242178E-04  2.407963E-02 -1.132592E-03
# Covariance matrix:
  7.4095E-13  1.9396E-12 -2.6237E-15  6.9510E-14  1.7856E-12  5.1664E-11
  1.9396E-12  6.4414E-10 -9.6642E-13  2.4139E-11  1.4204E-10  1.7839E-08
 -2.6237E-15 -9.6642E-13  3.8406E-13 -2.2148E-13 -2.1105E-13 -2.6784E-11
  6.9510E-14  2.4139E-11 -2.2148E-13  1.0771E-12  5.2864E-12  6.6891E-10
  1.7856E-12  1.4204E-10 -2.1105E-13  5.2864E-12  3.6267E-11  3.9079E-09
  5.1664E-11  1.7839E-08 -2.6784E-11  6.6891E-10  3.9079E-09  4.9435E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.249193   -8.016697    0.298764   -0.020907   -0.958937  2458723.711696
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:          291.70396 +/-     7.171
Argument of Peri:       35.56406 +/-    10.481
Long of Asc Node:       30.30990 +/-     0.020
Inclination:             1.95052 +/-     0.001
Eccentricity:         0.05532968 +/-    0.0288
Semi-Major Axis:     43.26058858 +/-    0.0670
Time of Perihelion: 2478437.0105 +/-    2069.6
Perihelion:          40.86699419 +/-    1.2483
Aphelion:            45.65418298 +/-    1.2487
Period (y)              284.5423 +/-      0.66
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           42.02420105 +/-    0.0103
Ecliptic Y           -6.22690787 +/-    0.0015
Ecliptic Z           -0.90536197 +/-    0.0002
Ecliptic XDOT         0.00025303 +/-    0.0001
Ecliptic YDOT         0.00264916 +/-    0.0000
Ecliptic ZDOT         0.00007354 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.49267626 +/-    0.0102
Geocenter to KBO     41.52886881 +/-    0.0104
# Hcoef:  9.05

The following table shows the complete astrometric record for 19SM235. 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 (19SM235) followed by the observatory code and reference code for the source of the astrometry.

2019 08  28.210895 23 32 31.542  -04 19 40.24  25.2r 19SM235   W84  C~7XM7      
2019 08  28.388381 23 32 30.783  -04 19 45.16  25.2r 19SM235   W84  C~7XM7      
2019 09  29.013696 23 30 13.213  -04 34 18.18  25.1r 19SM235   W84  C~7XM7      
2019 09  29.177510 23 30 12.494  -04 34 22.39  25.1r 19SM235   W84  C~7XM7      
2021 10  04.002582 23 39 37.274  -03 28 55.71  25.4r 19SM235   W84  C~7XM8      
2021 10  04.175328 23 39 36.540  -03 29 00.19  25.4r 19SM235   W84  C~7XM8      
2021 10  07.004805 23 39 24.758  -03 30 13.37  25.2r 19SM235   W84  C~7XM8      
2021 10  07.169933 23 39 24.059  -03 30 17.77  25.2r 19SM235   W84  C~7XM8      

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     0.09
     2   0.0005    -12.37    -0.09      -0.04     0.01
     3   0.0871  -2247.34     0.02       9.75    -0.14
     4   0.0875  -2258.88    -0.02      10.12     0.03
     5   2.1021   7058.66    -0.05     272.64    -0.04
     6   2.1026   7046.78     0.04     272.89    -0.02
     7   2.1103   6855.60     0.08     275.74     0.09
     8   2.1108   6844.24    -0.07     275.86    -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.

19SM235    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.340    43.706    43.289
ecceobj         0.060     0.038     0.072
incobj          1.950     1.949     1.950
qmin           39.239    41.316    38.430
qmax           47.468    46.068    48.146
amean          43.216    43.590    43.164
amin           42.864    43.248    42.812
amax           43.582    43.936    43.537
emean           0.070     0.032     0.084
emin            0.048     0.013     0.062
emax            0.089     0.049     0.107
imean           1.579     1.744     1.657
imin            0.413     0.914     0.176
imax            2.501     2.441     2.543
excite_mean     0.076     0.045     0.090
fracstop        1.000     1.000     1.000
cjmean          3.085     3.094     3.082

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       178.7     200.2     174.9
kozaiamp        180.0     179.9     180.0