Orbit Fit and Astrometric record for 20UF74

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: 20UF74    
# Created Tue Apr  1 01:11:22 2025
# Orbit generated from Bernstein formalism
# Fitting     10 observations of     10
# Arc:   2.02y
# First observation: 2019/09/29
#  Last observation: 2021/10/04
Preliminary a, adot, b, bdot, g, gdot:
   0.000000   0.025576  -0.000002   0.000828   0.025353   0.000000
# Chi-squared of fit:     2.13 DOF:     14 RMS:  0.08
# Min/Max residuals:    -0.16    0.17
# Exact a, adot, b, bdot, g, gdot:
  1.584867E-05  2.556858E-02  8.114024E-07  8.271556E-04  2.509727E-02 -3.287975E-05
# Covariance matrix:
  7.3407E-13 -5.5842E-13  1.9661E-15 -7.8598E-15  7.2239E-13 -4.4905E-12
 -5.5842E-13  1.5945E-10 -1.3756E-12  5.2323E-12  3.3561E-10  2.9466E-09
  1.9661E-15 -1.3756E-12  5.5483E-13 -3.6727E-13 -2.9006E-12 -2.5463E-11
 -7.8598E-15  5.2323E-12 -3.6727E-13  4.3412E-13  1.1030E-11  9.6852E-11
  7.2239E-13  3.3561E-10 -2.9006E-12  1.1030E-11  7.1535E-10  6.2115E-09
 -4.4905E-12  2.9466E-09 -2.5463E-11  9.6852E-11  6.2115E-09  5.4543E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.114208   -9.114678   -0.256580   -0.001911   -0.966278  2458755.514497
# Heliocentric elements and errors
Epoch:              2458750.5000  =  2019/09/24
Mean Anomaly:            5.37790 +/-     6.420
Argument of Peri:      350.24360 +/-     7.513
Long of Asc Node:      354.68759 +/-     0.001
Inclination:             1.85111 +/-     0.001
Eccentricity:         0.07637717 +/-    0.0014
Semi-Major Axis:     44.17243889 +/-    0.1571
Time of Perihelion: 2457148.5979 +/-    1912.4
Perihelion:          40.79867320 +/-    0.1579
Aphelion:            47.54620457 +/-    0.1802
Period (y)              293.5860 +/-      1.57
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           40.33960975 +/-    0.0419
Ecliptic Y           -6.21855334 +/-    0.0067
Ecliptic Z           -0.07940675 +/-    0.0001
Ecliptic XDOT         0.00044698 +/-    0.0000
Ecliptic YDOT         0.00275551 +/-    0.0000
Ecliptic ZDOT         0.00009001 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.81618338 +/-    0.0414
Geocenter to KBO     39.84497029 +/-    0.0425
# Hcoef:  9.32

The following table shows the complete astrometric record for 20UF74. 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 (20UF74) followed by the observatory code and reference code for the source of the astrometry.

2019 09  29.013696 23 26 41.125  -03 43 03.80  25.4r 20UF74    W84  C~7XOQ      
2019 09  29.177510 23 26 40.386  -03 43 08.30  25.4r 20UF74    W84  C~7XOQ      
2020 10  17.010669 23 30 43.595  -03 13 51.51  25.3r 20UF74    W84  C~7XOQ      
2020 10  17.174574 23 30 42.976  -03 13 55.19  25.3r 20UF74    W84  C~7XOQ      
2020 10  21.004397 23 30 29.125  -03 15 22.02  25.5r 20UF74    W84  C~7XOQ      
2020 10  21.174149 23 30 28.542  -03 15 25.84  25.5r 20UF74    W84  C~7XOQ      
2021 10  03.011907 23 37 00.618  -02 30 24.00  25.2r 20UF74    W84  C~7XOQ      
2021 10  03.165173 23 36 59.950  -02 30 28.29  25.2r 20UF74    W84  C~7XOQ      
2021 10  04.002582 23 36 56.344  -02 30 51.26  25.3r 20UF74    W84  C~7XOQ      
2021 10  04.175328 23 36 55.581  -02 30 55.86  25.3r 20UF74    W84  C~7XOQ      

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    -0.06
     2   0.0004    -11.94    -0.05       0.22     0.01
     3   1.0513   4027.63    -0.05     179.84    -0.06
     4   1.0518   4017.65     0.06     180.11     0.06
     5   1.0623   3792.71    -0.16     182.16     0.17
     6   1.0627   3783.18     0.15     182.10    -0.06
     7   2.0123  10254.48    -0.09     342.99     0.06
     8   2.0127  10243.56    -0.00     343.01    -0.06
     9   2.0150  10184.70     0.06     343.30    -0.10
    10   2.0155  10172.35     0.03     343.61     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.

20UF74    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.207    44.587    43.870
ecceobj         0.078     0.082     0.079
incobj          1.855     1.854     1.855
qmin           39.974    40.087    39.419
qmax           48.399    49.056    48.352
amean          44.086    44.456    43.715
amin           43.736    44.098    43.334
amax           44.470    44.838    44.141
emean           0.074     0.079     0.070
emin            0.057     0.063     0.040
emax            0.089     0.095     0.096
imean           2.579     2.600     2.485
imin            1.790     1.855     1.498
imax            3.260     3.219     3.343
excite_mean     0.086     0.091     0.083
fracstop        1.000     1.000     1.000
cjmean          3.093     3.097     3.090

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       183.1     183.1     184.4
kozaiamp        180.0     180.0     180.0