Orbit Fit and Astrometric record for 20UY73

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: 20UY73    
# Created Tue Apr  1 01:11:22 2025
# Orbit generated from Bernstein formalism
# Fitting     10 observations of     10
# Arc:   2.11y
# First observation: 2019/08/28
#  Last observation: 2021/10/07
Preliminary a, adot, b, bdot, g, gdot:
   0.000000   0.024342  -0.000001   0.000410   0.024603   0.000000
# Chi-squared of fit:     8.47 DOF:     14 RMS:  0.16
# Min/Max residuals:    -0.27    0.33
# Exact a, adot, b, bdot, g, gdot:
  1.560689E-05  2.439260E-02 -3.676129E-08  4.116579E-04  2.463361E-02  1.179120E-03
# Covariance matrix:
  7.4234E-13  3.9958E-12 -2.1947E-14  6.8087E-14  5.5928E-12  7.4284E-11
  3.9958E-12  2.5027E-09 -1.2834E-11  4.1249E-11  2.9680E-09  4.4995E-08
 -2.1947E-14 -1.2834E-11  6.2061E-13 -5.2543E-13 -1.5221E-11 -2.3076E-10
  6.8087E-14  4.1249E-11 -5.2543E-13  9.2196E-13  4.8915E-11  7.4173E-10
  5.5928E-12  2.9680E-09 -1.5221E-11  4.8915E-11  3.5214E-09  5.3357E-08
  7.4284E-11  4.4995E-08 -2.3076E-10  7.4173E-10  5.3357E-08  8.0909E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.071346   -8.423952    0.291938   -0.017970   -0.961096  2458723.711696
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:           47.70730 +/-    20.599
Argument of Peri:      259.57749 +/-    24.983
Long of Asc Node:       38.75812 +/-     0.048
Inclination:             1.41708 +/-     0.001
Eccentricity:         0.05735578 +/-    0.0286
Semi-Major Axis:     43.14341402 +/-    0.0699
Time of Perihelion: 2445003.7079 +/-    5922.5
Perihelion:          40.66888997 +/-    1.2348
Aphelion:            45.61793806 +/-    1.2352
Period (y)              283.3870 +/-      0.69
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           41.06090878 +/-    0.0967
Ecliptic Y           -6.38256617 +/-    0.0143
Ecliptic Z           -0.75902018 +/-    0.0018
Ecliptic XDOT         0.00053608 +/-    0.0001
Ecliptic YDOT         0.00266306 +/-    0.0000
Ecliptic ZDOT         0.00004307 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.56093709 +/-    0.0956
Geocenter to KBO     40.59494600 +/-    0.0978
# Hcoef:  9.77

The following table shows the complete astrometric record for 20UY73. 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 (20UY73) followed by the observatory code and reference code for the source of the astrometry.

2019 08  28.210895 23 30 44.603  -04 19 30.73  25.7r 20UY73    W84  C~7XOQ      
2019 08  28.388381 23 30 43.843  -04 19 35.87  25.7r 20UY73    W84  C~7XOQ      
2020 10  17.010669 23 32 14.461  -04 07 55.47  26.3r 20UY73    W84  C~7XOQ      
2020 10  17.174574 23 32 13.865  -04 07 59.69  26.3r 20UY73    W84  C~7XOQ      
2020 10  18.012125 23 32 10.811  -04 08 18.16  25.8r 20UY73    W84  C~7XOQ      
2020 10  18.176134 23 32 10.175  -04 08 21.55  25.8r 20UY73    W84  C~7XOQ      
2021 10  04.002582 23 38 13.638  -03 28 00.11  25.8r 20UY73    W84  C~7XOQ      
2021 10  04.175328 23 38 12.901  -03 28 04.96  25.8r 20UY73    W84  C~7XOQ      
2021 10  07.004805 23 38 00.987  -03 29 19.60  25.8r 20UY73    W84  C~7XOQ      
2021 10  07.169933 23 38 00.297  -03 29 23.58  25.8r 20UY73    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     0.01       0.00     0.06
     2   0.0005    -12.47    -0.00      -0.24    -0.21
     3   1.1384   1509.53    -0.11     108.04     0.33
     4   1.1388   1499.67    -0.01     107.69    -0.27
     5   1.1411   1450.39     0.18     108.77    -0.06
     6   1.1416   1440.31    -0.08     109.41     0.33
     7   2.1021   7397.54    -0.09     179.65     0.10
     8   2.1026   7385.47    -0.04     179.57    -0.18
     9   2.1103   7191.87    -0.07     181.80    -0.17
    10   2.1108   7180.80     0.20     182.25     0.07

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.

20UY73    quality flag:2

Type:      CLASSICAL  SCATNEAR CLASSICAL

axisobj        43.171    43.594    43.135
ecceobj         0.056     0.137     0.048
incobj          1.418     1.415     1.418
qmin           40.058    34.060    40.346
qmax           46.283    53.404    45.882
amean          43.070    43.534    43.030
amin           42.737    43.129    42.699
amax           43.418    44.027    43.363
emean           0.048     0.172     0.042
emin            0.027     0.129     0.020
emax            0.066     0.216     0.058
imean           1.534     5.666     1.504
imin            0.341     1.694     0.287
imax            2.219     9.066     2.204
excite_mean     0.056     0.201     0.050
fracstop        1.000     1.000     1.000
cjmean          3.087     3.045     3.087

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       184.2     182.3     184.8
kozaiamp        180.0     180.0     180.0