Orbit Fit and Astrometric record for 20UE74

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: 20UE74    
# Created Tue Apr  1 01:11:22 2025
# Orbit generated from Bernstein formalism
# Fitting     10 observations of     10
# Arc:   2.03y
# First observation: 2019/08/30
#  Last observation: 2021/09/09
Preliminary a, adot, b, bdot, g, gdot:
  -0.000002   0.022918  -0.000000   0.000286   0.023781   0.000000
# Chi-squared of fit:     8.10 DOF:     14 RMS:  0.16
# Min/Max residuals:    -0.33    0.36
# Exact a, adot, b, bdot, g, gdot:
  1.500574E-05  2.295716E-02  2.752717E-07  2.876662E-04  2.379505E-02  1.627765E-03
# Covariance matrix:
  7.3903E-13  7.3879E-13 -3.8936E-15  1.0864E-14  1.6714E-12  2.2710E-11
  7.3879E-13  4.5348E-12 -1.3729E-14  5.2723E-14  5.5613E-12  1.0549E-10
 -3.8936E-15 -1.3729E-14  3.4447E-13 -2.2465E-13 -1.9738E-14 -3.3379E-13
  1.0864E-14  5.2723E-14 -2.2465E-13  2.5674E-13  6.6153E-14  1.3057E-12
  1.6714E-12  5.5613E-12 -1.9738E-14  6.6153E-14  8.2177E-12  1.3466E-10
  2.2710E-11  1.0549E-10 -3.3379E-13  1.3057E-12  1.3466E-10  2.6069E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -2.806497   -7.976518    0.266651   -0.047405   -0.967141  2458725.713221
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:           68.91186 +/-     0.286
Argument of Peri:      207.58046 +/-     0.531
Long of Asc Node:       67.35863 +/-     0.025
Inclination:             2.83057 +/-     0.000
Eccentricity:         0.07061274 +/-    0.0022
Semi-Major Axis:     43.91462235 +/-    0.0089
Time of Perihelion: 2438373.3478 +/-      84.1
Perihelion:          40.81369045 +/-    0.0949
Aphelion:            47.01555425 +/-    0.0950
Period (y)              291.0194 +/-      0.09
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           42.49380272 +/-    0.0050
Ecliptic Y           -6.23018952 +/-    0.0007
Ecliptic Z           -2.05768703 +/-    0.0002
Ecliptic XDOT         0.00056187 +/-    0.0000
Ecliptic YDOT         0.00259029 +/-    0.0000
Ecliptic ZDOT         0.00002366 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.99735581 +/-    0.0049
Geocenter to KBO     42.02554427 +/-    0.0051
# Hcoef:  9.15

The following table shows the complete astrometric record for 20UE74. 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 (20UE74) followed by the observatory code and reference code for the source of the astrometry.

2019 08  30.212420 23 35 08.803  -05 44 32.40  25.4r 20UE74    W84  C~7XOQ      
2019 08  30.387214 23 35 08.061  -05 44 37.38  25.4r 20UE74    W84  C~7XOQ      
2019 09  28.012277 23 33 04.511  -05 57 47.69  25.2r 20UE74    W84  C~7XOQ      
2019 09  28.177548 23 33 03.753  -05 57 52.26  25.2r 20UE74    W84  C~7XOQ      
2020 10  20.004233 23 36 24.451  -05 34 31.18  25.9r 20UE74    W84  C~7XOQ      
2020 10  20.172968 23 36 23.815  -05 34 34.74  25.9r 20UE74    W84  C~7XOQ      
2020 10  22.003924 23 36 17.524  -05 35 10.35  25.4r 20UE74    W84  C~7XOQ      
2020 10  22.173214 23 36 16.932  -05 35 13.49  25.4r 20UE74    W84  C~7XOQ      
2021 09  09.073508 23 44 03.329  -04 44 49.77  25.1r 20UE74    W84  C~7XOQ      
2021 09  09.192572 23 44 02.810  -04 44 52.86  25.1r 20UE74    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    -0.02
     2   0.0005    -12.14    -0.07      -0.19    -0.13
     3   0.0788  -2018.04     0.34       3.06     0.00
     4   0.0793  -2030.24    -0.33       3.33     0.03
     5   1.1411   1275.00     0.36     104.68     0.13
     6   1.1416   1264.87    -0.18     105.18     0.12
     7   1.1466   1164.53    -0.07     109.71    -0.05
     8   1.1471   1155.17    -0.11     110.33     0.05
     9   2.0284   8755.69    -0.05     112.83    -0.20
    10   2.0287   8747.33     0.05     113.10     0.05

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.

20UE74    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.941    43.974    43.909
ecceobj         0.067     0.071     0.063
incobj          2.831     2.831     2.831
qmin           40.389    40.218    40.495
qmax           47.513    47.675    47.329
amean          43.827    43.861    43.794
amin           43.475    43.514    43.449
amax           44.194    44.227    44.150
emean           0.057     0.061     0.053
emin            0.040     0.044     0.035
emax            0.076     0.079     0.072
imean           1.239     1.237     1.241
imin            0.368     0.367     0.367
imax            1.923     1.921     1.923
excite_mean     0.062     0.065     0.058
fracstop        1.000     1.000     1.000
cjmean          3.095     3.095     3.095

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       196.3     202.0     191.5
kozaiamp        180.0     180.0     180.0