Orbit Fit and Astrometric record for 20FQ38

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: 20FQ38    
# Created Thu Apr  3 01:11:22 2025
# Orbit generated from Bernstein formalism
# Fitting     12 observations of     12
# Arc:   1.05y
# First observation: 2020/03/24
#  Last observation: 2021/04/13
Preliminary a, adot, b, bdot, g, gdot:
  -0.000007   0.011819  -0.000000   0.000374   0.016805   0.000000
# Chi-squared of fit:     4.79 DOF:     18 RMS:  0.11
# Min/Max residuals:    -0.23    0.25
# Exact a, adot, b, bdot, g, gdot:
  1.099713E-05  1.183076E-02  3.000295E-07  3.737941E-04  1.682551E-02  1.511231E-03
# Covariance matrix:
  7.3689E-13  5.8166E-14 -1.4559E-15  2.8090E-14  8.9590E-13  6.8030E-11
  5.8166E-14  8.6273E-12 -3.4855E-14  3.4159E-13  3.7528E-12  7.5718E-10
 -1.4559E-15 -3.4855E-14  2.7561E-13 -3.1209E-13 -1.6112E-14 -3.2893E-12
  2.8090E-14  3.4159E-13 -3.1209E-13  6.4610E-13  1.8038E-13  3.3265E-11
  8.9590E-13  3.7528E-12 -1.6112E-14  1.8038E-13  2.9369E-12  4.0922E-10
  6.8030E-11  7.5718E-10 -3.2893E-12  3.3265E-11  4.0922E-10  7.4166E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
    8.753084 -146.843006    0.494835    0.132382   -0.860219  2458932.931491
# Heliocentric elements and errors
Epoch:              2458930.5000  =  2020/03/22
Mean Anomaly:          147.92095 +/-     3.783
Argument of Peri:      277.44537 +/-     3.683
Long of Asc Node:      135.30416 +/-     0.030
Inclination:             8.83700 +/-     0.001
Eccentricity:         0.25622602 +/-    0.0055
Semi-Major Axis:     48.98654433 +/-    0.1728
Time of Perihelion: 2407473.9312 +/-    1287.6
Perihelion:          36.43491705 +/-    0.2999
Aphelion:            61.53817162 +/-    0.3472
Period (y)              342.8652 +/-      1.81
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -50.17123978 +/-    0.0050
Ecliptic Y          -32.19725760 +/-    0.0032
Ecliptic Z            9.04443917 +/-    0.0009
Ecliptic XDOT         0.00086539 +/-    0.0000
Ecliptic YDOT        -0.00173673 +/-    0.0000
Ecliptic ZDOT         0.00009731 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   60.29609090 +/-    0.0045
Geocenter to KBO     59.43357729 +/-    0.0061
# Hcoef:  7.22

The following table shows the complete astrometric record for 20FQ38. 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 (20FQ38) followed by the observatory code and reference code for the source of the astrometry.

2020 03  24.43069  14 15 41.548  -04 19 28.20  24.8r 20FQ38    568  C~5Jza      
2020 03  24.60765  14 15 41.051  -04 19 24.69  25.0r 20FQ38    568  C~5Jza      
2020 05  27.22438  14 12 21.791  -04 01 44.55  25.0r 20FQ38    G37  C~5Jza      
2020 05  27.23004  14 12 21.757  -04 01 44.58        20FQ38    G37  C~5Jza      
2020 05  27.28166  14 12 21.601  -04 01 43.87        20FQ38    G37  C~5Jza      
2020 05  27.28783  14 12 21.601  -04 01 43.98  24.8r 20FQ38    G37  C~5Jza      
2020 05  27.29944  14 12 21.545  -04 01 43.79  25.0r 20FQ38    G37  C~5Jza      
2021 03  17.23303  14 18 36.061  -04 34 10.04  25.1r 20FQ38    304  C~5Jza      
2021 03  17.36752  14 18 35.737  -04 34 07.43  25.0r 20FQ38    304  C~5Jza      
2021 03  18.34982  14 18 33.318  -04 33 48.67  24.7r 20FQ38    304  C~5Jza      
2021 04  12.24090  14 17 21.487  -04 25 45.69  25.1r 20FQ38    304  C~5Jza      
2021 04  13.20222  14 17 18.388  -04 25 27.42  25.0r 20FQ38    304  C~5Jza      

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     0.03       0.00     0.01
     2   0.0005     -8.18    -0.02       0.83     0.04
     3   0.1747  -3172.29     0.25       2.88     0.08
     4   0.1747  -3172.76     0.03       2.68    -0.09
     5   0.1748  -3175.20    -0.18       2.57     0.05
     6   0.1748  -3175.16     0.13       2.47    -0.03
     7   0.1749  -3176.01    -0.23       2.36    -0.07
     8   0.9796   2754.66     0.04      39.02    -0.14
     9   0.9800   2749.22     0.13      39.87    -0.03
    10   0.9827   2708.86    -0.19      45.51     0.03
    11   1.0508   1535.03     0.08     142.94     0.15
    12   1.0534   1485.24    -0.06     144.71    -0.02

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.

20FQ38    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        48.679    49.311    48.295
ecceobj         0.265     0.282     0.256
incobj          8.836     8.838     8.834
qmin           35.179    34.927    35.230
qmax           63.741    64.969    62.624
amean          49.098    49.502    48.635
amin           48.590    48.597    48.064
amax           49.732    50.298    49.224
emean           0.266     0.277     0.257
emin            0.249     0.260     0.241
emax            0.282     0.295     0.273
imean           8.097     8.022     8.163
imin            7.215     7.234     7.175
imax            8.986     8.946     9.150
excite_mean     0.301     0.310     0.293
fracstop        1.000     1.000     1.000
cjmean          3.051     3.048     3.051

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       184.5     183.3     179.6
kozaiamp        180.0     180.0     179.9