Orbit Fit and Astrometric record for 20UH74

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: 20UH74    
# Created Tue Apr  1 01:11:22 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   0.96y
# First observation: 2020/10/20
#  Last observation: 2021/10/06
Preliminary a, adot, b, bdot, g, gdot:
   0.000002   0.022032   0.000000   0.001131   0.023572   0.000000
# Chi-squared of fit:     1.24 DOF:     10 RMS:  0.07
# Min/Max residuals:    -0.11    0.11
# Exact a, adot, b, bdot, g, gdot:
  1.475750E-05  2.201121E-02  1.228462E-06  1.127330E-03  2.340686E-02  5.035680E-04
# Covariance matrix:
  8.4177E-13  5.1185E-11 -3.2611E-14  2.3738E-12  3.9252E-11  2.3213E-09
  5.1185E-11  5.6337E-09 -3.5551E-12  2.5900E-10  4.2766E-09  2.5333E-07
 -3.2611E-14 -3.5551E-12  3.7093E-13 -5.6314E-13 -2.7061E-12 -1.5999E-10
  2.3738E-12  2.5900E-10 -5.6314E-13  1.2775E-11  1.9689E-10  1.1652E-08
  3.9252E-11  4.2766E-09 -2.7061E-12  1.9689E-10  3.2581E-09  1.9251E-07
  2.3213E-09  2.5333E-07 -1.5999E-10  1.1652E-08  1.9251E-07  1.1396E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
   -3.104064   -7.267347   -0.563082   -0.044361   -0.816998  2459142.505034
# Heliocentric elements and errors
Epoch:              2459140.5000  =  2020/10/18
Mean Anomaly:          111.45349 +/-    84.879
Argument of Peri:      198.39988 +/-    84.446
Long of Asc Node:       39.17317 +/-     0.047
Inclination:             4.25045 +/-     0.003
Eccentricity:         0.04165970 +/-    0.1369
Semi-Major Axis:     42.83426548 +/-    0.2005
Time of Perihelion: 2427439.2360 +/-   24141.6
Perihelion:          41.04980283 +/-    5.8652
Aphelion:            44.61872812 +/-    5.8658
Period (y)              280.3465 +/-      1.97
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           43.20622301 +/-    0.1032
Ecliptic Y           -4.94715900 +/-    0.0132
Ecliptic Z           -2.31339093 +/-    0.0056
Ecliptic XDOT         0.00039837 +/-    0.0004
Ecliptic YDOT         0.00255070 +/-    0.0000
Ecliptic ZDOT         0.00012826 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.55001569 +/-    0.1024
Geocenter to KBO     42.72252503 +/-    0.1042
# Hcoef:  8.17

The following table shows the complete astrometric record for 20UH74. 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 (20UH74) followed by the observatory code and reference code for the source of the astrometry.

2020 10  20.004233 23 38 14.091  -05 44 05.68  24.5r 20UH74    W84  C~7XOQ      
2020 10  20.172968 23 38 13.477  -05 44 08.74  24.5r 20UH74    W84  C~7XOQ      
2020 10  22.003924 23 38 07.146  -05 44 43.20  24.5r 20UH74    W84  C~7XOQ      
2020 10  22.173214 23 38 06.548  -05 44 46.33  24.5r 20UH74    W84  C~7XOQ      
2021 09  09.073508 23 45 38.121  -04 53 13.49  24.4r 20UH74    W84  C~7XOQ      
2021 09  09.192572 23 45 37.587  -04 53 16.72  24.4r 20UH74    W84  C~7XOQ      
2021 10  06.002765 23 43 42.703  -05 05 07.75  24.5r 20UH74    W84  C~7XOQ      
2021 10  06.167954 23 43 42.004  -05 05 11.77  24.5r 20UH74    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     0.02       0.00    -0.10
     2   0.0005     -9.63    -0.02       0.82     0.11
     3   0.0055   -110.03     0.05       6.66    -0.02
     4   0.0059   -119.47    -0.06       7.32     0.01
     5   0.8873   7301.73     0.11     160.85    -0.11
     6   0.8876   7293.11    -0.11     161.07     0.05
     7   0.9610   5433.46     0.06     194.01    -0.00
     8   0.9614   5422.27    -0.06     194.48     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.

20UH74    quality flag:1

Type:      CLASSICAL  SCATNEAR CLASSICAL

axisobj        42.737    50.628    42.594
ecceobj         0.039     0.388     0.026
incobj          4.249     4.242     4.251
qmin           40.128    30.497    36.695
qmax           45.354    86.159    48.699
amean          42.631    51.541    42.486
amin           42.303    47.914    42.107
amax           42.961    58.957    42.868
emean           0.034     0.368     0.069
emin            0.013     0.331     0.016
emax            0.056     0.462     0.136
imean           3.023     9.085     3.395
imin            1.866     3.717     1.707
imax            4.060    11.781     4.587
excite_mean     0.063     0.402     0.093
fracstop        1.000     1.000     1.000
cjmean          3.081     2.983     3.072

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       184.7     185.0     176.5
kozaiamp        179.9     179.9     180.0