Orbit Fit and Astrometric record for 20FB31

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: 20FB31    
# Created Sat Dec  4 02:14:06 2021
# Orbit generated from Bernstein formalism
# Fitting      6 observations of      6
# Arc:   0.88y
# First observation: 2020/03/24
#  Last observation: 2021/02/08
Preliminary a, adot, b, bdot, g, gdot:
  -0.000004   0.007741   0.000010  -0.001131   0.013201   0.000000
# Chi-squared of fit:     0.98 DOF:      6 RMS:  0.07
# Min/Max residuals:    -0.12    0.12
# Exact a, adot, b, bdot, g, gdot:
  8.592437E-06  7.610398E-03 -1.257743E-06 -1.120449E-03  1.330812E-02 -2.611637E-03
# Covariance matrix:
  7.2751E-13 -3.0189E-12  1.1047E-14  1.4420E-13 -2.1185E-13 -1.4139E-10
 -3.0189E-12  1.8542E-10  6.2451E-12 -2.0760E-11  8.6869E-11  1.5318E-08
  1.1047E-14  6.2451E-12  7.3245E-13 -1.4006E-12  3.3425E-12  5.4508E-10
  1.4420E-13 -2.0760E-11 -1.4006E-12  4.1756E-12 -1.0346E-11 -1.7643E-09
 -2.1185E-13  8.6869E-11  3.3425E-12 -1.0346E-11  4.4948E-11  7.4857E-09
 -1.4139E-10  1.5318E-08  5.4508E-10 -1.7643E-09  7.4857E-09  1.2925E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
   14.274807  163.287851   -0.344874    0.231696   -0.910875  2458932.832541
# Heliocentric elements and errors
Epoch:              2458930.5000  =  2020/03/22
Mean Anomaly:          244.93345 +/-    15.802
Argument of Peri:      269.07058 +/-    11.009
Long of Asc Node:       42.15779 +/-     0.076
Inclination:            16.39990 +/-     0.013
Eccentricity:         0.41936035 +/-    0.0497
Semi-Major Axis:     59.20543042 +/-    2.9891
Time of Perihelion: 2512115.2756 +/-    6092.6
Perihelion:          34.37702013 +/-    3.4155
Aphelion:            84.03384070 +/-    5.1627
Period (y)              455.5652 +/-     34.50
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -70.74122086 +/-    0.0351
Ecliptic Y           20.87308336 +/-    0.0105
Ecliptic Z           18.52792927 +/-    0.0093
Ecliptic XDOT         0.00000225 +/-    0.0002
Ecliptic YDOT        -0.00163015 +/-    0.0001
Ecliptic ZDOT        -0.00035610 +/-    0.0001
# Distances at JD0 (AU)
Heliocenter to KBO   76.04794606 +/-    0.0329
Geocenter to KBO     75.14210538 +/-    0.0379
# Hcoef:  5.55

The following table shows the complete astrometric record for 20FB31. 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 (20FB31) followed by the observatory code and reference code for the source of the astrometry.

2020 03  24.33174  11 21 27.133  +19 41 56.81  24.2r 20FB31    568  C~4ZhQ      
2020 03  24.50453  11 21 26.640  +19 41 59.01  24.3r 20FB31    568  C~4ZhQ      
2020 06  11.16719  11 19 31.760  +19 40 07.85  24.5r 20FB31    G37  C~4ZhQ      
2020 06  11.22079  11 19 31.780  +19 40 07.01  24.3r 20FB31    G37  C~4ZhQ      
2021 02  07.24673  11 25 05.164  +19 14 53.11  24.3r 20FB31    304  C~4ZhQ      
2021 02  08.20450  11 25 02.878  +19 15 12.35  24.2r 20FB31    304  C~4ZhQ      

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     0.09       0.00    -0.02
     2   0.0005     -7.26    -0.10      -0.81     0.02
     3   0.2158  -1447.11    -0.04    -756.99     0.00
     4   0.2160  -1446.51     0.04    -757.64    -0.01
     5   0.8759   3477.63     0.12    -227.91    -0.07
     6   0.8785   3440.21    -0.12    -223.61     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.

20FB31    quality flag:1

Type:       SCATNEAR  CENTAURS  SCATNEAR

axisobj        59.085    77.188    55.963
ecceobj         0.416     0.607     0.357
incobj         16.448    16.488    16.422
qmin           34.157    29.725    35.324
qmax           85.947   137.827    77.962
amean          59.449    80.958    56.107
amin           58.725    74.735    55.363
amax           60.420    84.511    57.013
emean           0.408     0.617     0.353
emin            0.391     0.574     0.337
emax            0.424     0.633     0.369
imean          16.245    16.768    15.764
imin           15.103    15.272    14.990
imax           17.250    19.484    16.487
excite_mean     0.495     0.681     0.445
fracstop        1.000     1.000     1.000
cjmean          2.969     2.842     2.995

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       187.5     190.2     170.9
kozaiamp        180.0     179.8     180.0