Orbit Fit and Astrometric record for 20FY30

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: 20FY30    
# Created Thu Jul  3 01:11:47 2025
# Orbit generated from Bernstein formalism
# Fitting     14 observations of     14
# Arc:   4.84y
# First observation: 2016/03/17
#  Last observation: 2021/01/18
Preliminary a, adot, b, bdot, g, gdot:
   0.000009   0.004574  -0.000003  -0.000922   0.010076   0.000000
# Chi-squared of fit:     2.57 DOF:     22 RMS:  0.08
# Min/Max residuals:    -0.22    0.15
# Exact a, adot, b, bdot, g, gdot:
  7.318850E-06  4.575811E-03 -1.255162E-06 -9.193601E-04  1.011405E-02 -1.175468E-03
# Covariance matrix:
  4.8859E-13 -2.0183E-13 -1.3804E-15  1.8020E-14 -1.8995E-13 -4.3946E-12
 -2.0183E-13  2.4843E-12  2.8357E-14 -4.6599E-13  5.7332E-12  1.1512E-10
 -1.3804E-15  2.8357E-14  4.8272E-13 -1.1767E-13  6.4030E-14  1.3531E-12
  1.8020E-14 -4.6599E-13 -1.1767E-13  1.2219E-13 -1.0835E-12 -2.1946E-11
 -1.8995E-13  5.7332E-12  6.4030E-14 -1.0835E-12  1.3543E-11  2.6804E-10
 -4.3946E-12  1.1512E-10  1.3531E-12 -2.1946E-11  2.6804E-10  5.4180E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    8.143230 -147.527835    0.574432    0.114611   -0.800038  2457465.083014
# Heliocentric elements and errors
Epoch:              2457460.5000  =  2016/03/13
Mean Anomaly:          220.43699 +/-     1.229
Argument of Peri:      307.47833 +/-     0.984
Long of Asc Node:       67.20976 +/-     0.008
Inclination:            13.87303 +/-     0.003
Eccentricity:         0.47886306 +/-    0.0023
Semi-Major Axis:     69.99850016 +/-    0.2449
Time of Perihelion: 2540388.1509 +/-     586.5
Perihelion:          36.47880451 +/-    0.2081
Aphelion:           103.51819581 +/-    0.3977
Period (y)              585.6543 +/-      3.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -83.56652846 +/-    0.0300
Ecliptic Y          -52.50019945 +/-    0.0191
Ecliptic Z           14.00500228 +/-    0.0051
Ecliptic XDOT         0.00090099 +/-    0.0000
Ecliptic YDOT        -0.00090179 +/-    0.0000
Ecliptic ZDOT        -0.00029142 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   99.67836130 +/-    0.0271
Geocenter to KBO     98.87240227 +/-    0.0360
# Hcoef:  4.62

The following table shows the complete astrometric record for 20FY30. 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 (20FY30) followed by the observatory code and reference code for the source of the astrometry.

2016 03  17.582225 14 12 18.68   -04 40 18.8         20FY30    T09  C~8vLV      
2016 03  17.604944 14 12 18.65   -04 40 18.4         20FY30    T09  C~8vLV      
2016 03  17.632021 14 12 18.60   -04 40 18.3         20FY30    T09  C~8vLV      
2020 03  24.43069  14 15 50.393  -05 12 20.36  24.3r 20FY30    568  C~4ZhP      
2020 03  24.60765  14 15 50.065  -05 12 18.25  24.2r 20FY30    568  C~4ZhP      
2020 05  27.16312  14 13 42.797  -05 01 46.26  24.6r 20FY30    G37  C~4ZhP      
2020 05  27.16918  14 13 42.791  -05 01 45.96  24.7r 20FY30    G37  C~4ZhP      
2020 05  27.17673  14 13 42.778  -05 01 45.85  24.5r 20FY30    G37  C~4ZhP      
2020 05  27.23629  14 13 42.661  -05 01 45.61  24.5r 20FY30    G37  C~4ZhP      
2020 05  27.24364  14 13 42.652  -05 01 45.65  24.6r 20FY30    G37  C~4ZhP      
2020 06  11.21302  14 13 18.240  -05 00 33.87  24.4r 20FY30    G37  C~4ZhP      
2020 06  11.27376  14 13 18.154  -05 00 33.51  24.8r 20FY30    G37  C~4ZhP      
2021 01  17.36133  14 17 33.389  -05 29 06.30  24.5r 20FY30    304  C~4ZhP      
2021 01  18.36326  14 17 33.907  -05 29 04.29  24.5r 20FY30    304  C~4ZhP      

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    -0.04
     2   0.0001     -0.56     0.02       0.23     0.13
     3   0.0001     -1.29     0.01       0.07    -0.09
     4   4.0188   3626.06     0.08    -746.50    -0.03
     5   4.0192   3620.73    -0.09    -746.16     0.01
     6   4.1932   1617.16     0.03    -789.40    -0.22
     7   4.1933   1616.97     0.02    -789.15     0.06
     8   4.1933   1616.75     0.01    -789.11     0.12
     9   4.1934   1615.02    -0.06    -789.47    -0.04
    10   4.1935   1614.91     0.03    -789.56    -0.10
    11   4.2344   1247.22    -0.01    -844.62    -0.01
    12   4.2346   1245.89    -0.01    -844.72     0.15
    13   4.8372   5413.35     0.06   -1178.98    -0.01
    14   4.8399   5419.97    -0.05   -1174.49     0.06

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.

20FY30    quality flag:0

Type:      ERR2LARGE ERR2LARGE ERR2LARGE

axisobj         0.000     0.000     0.000
ecceobj        -1.000    -1.000    -1.000
incobj         -1.000    -1.000    -1.000
qmin            0.000     0.000     0.000
qmax            0.000     0.000     0.000
amean           0.000     0.000     0.000
amin            0.000     0.000     0.000
amax            0.000     0.000     0.000
emean           0.000     0.000     0.000
emin            0.000     0.000     0.000
emax            0.000     0.000     0.000
imean           0.000     0.000     0.000
imin            0.000     0.000     0.000
imax            0.000     0.000     0.000
excite_mean     0.000     0.000     0.000
fracstop        0.000     0.000     0.000
cjmean          0.000     0.000     0.000

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         0.0       0.0       0.0
kozaiamp          0.0       0.0       0.0