Orbit Fit and Astrometric record for 20BY101

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: 20BY101   
# Created Tue Apr  1 01:11:18 2025
# Orbit generated from Bernstein formalism
# Fitting      9 observations of     10
# Arc:   2.21y
# First observation: 2020/01/24
#  Last observation: 2022/04/09
Preliminary a, adot, b, bdot, g, gdot:
   0.000010   0.012204  -0.000001  -0.000564   0.016868   0.000000
# Chi-squared of fit:     7.93 DOF:     12 RMS:  0.17
# Min/Max residuals:    -0.37    0.36
# Exact a, adot, b, bdot, g, gdot:
  1.162908E-05  1.222469E-02 -2.449635E-07 -5.667974E-04  1.688692E-02 -3.150913E-03
# Covariance matrix:
  7.1436E-13 -9.5197E-13 -2.8134E-14  5.5353E-14 -7.4634E-13 -2.8677E-11
 -9.5197E-13  3.2882E-11  2.4992E-12 -6.1903E-12  2.4062E-11  2.3145E-09
 -2.8134E-14  2.4992E-12  6.5836E-13 -7.8111E-13  1.8212E-12  1.7916E-10
  5.5353E-14 -6.1903E-12 -7.8111E-13  1.4946E-12 -4.4948E-12 -4.4483E-10
 -7.4634E-13  2.4062E-11  1.8212E-12 -4.4948E-12  1.8066E-11  1.6895E-09
 -2.8677E-11  2.3145E-09  1.7916E-10 -4.4483E-10  1.6895E-09  1.6572E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
   10.372862  130.904702    0.128085    0.177258   -0.968332  2458872.861221
# Heliocentric elements and errors
Epoch:              2458870.5000  =  2020/01/22
Mean Anomaly:          253.19554 +/-     4.843
Argument of Peri:      239.28690 +/-     3.606
Long of Asc Node:       26.00853 +/-     0.017
Inclination:            10.54670 +/-     0.001
Eccentricity:         0.29325829 +/-    0.0190
Semi-Major Axis:     52.24683335 +/-    0.6337
Time of Perihelion: 2499794.2352 +/-    1699.8
Perihelion:          36.92501643 +/-    1.0912
Aphelion:            67.56865028 +/-    1.2891
Period (y)              377.6575 +/-      6.87
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -38.68635856 +/-    0.0096
Ecliptic Y           44.84512475 +/-    0.0111
Ecliptic Z           10.66224151 +/-    0.0027
Ecliptic XDOT        -0.00117147 +/-    0.0000
Ecliptic YDOT        -0.00166286 +/-    0.0000
Ecliptic ZDOT        -0.00018260 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   60.17809358 +/-    0.0103
Geocenter to KBO     59.21744605 +/-    0.0149
# Hcoef:  7.35

The following table shows the complete astrometric record for 20BY101. 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 (20BY101) followed by the observatory code and reference code for the source of the astrometry.

2020 01  24.36042  09 06 08.436  +27 26 47.85  25.1r 20BY101   568  C~5Zef      
2020 01  24.59270  09 06 07.540  +27 26 51.77  25.0r 20BY101   568  C~5Zef      
2020 12  16.32099  09 11 08.256  +27 00 54.19  25.1r 20BY101   304  C~5Zef      
2020 12  16.35062  09 11 08.214  +27 00 54.63  25.2r 20BY101   304  C~5Zef      
2020 12  17.30952  09 11 05.928  +27 01 12.10  25.0r 20BY101   304  C~5Zef      
2020 12  17.34520  09 11 05.866  +27 01 12.72  25.1r 20BY101   304  C~5Zef      
2021 01  15.25956  09 09 37.432  +27 10 02.39        20BY101   304  C~5Zef      
2021 01  16.22931  09 09 33.907  +27 10 20.13        20BY101   304  C~5Zef      
2022 04  08.03781  09 08 09.149  +27 07 37.93  25.0r 20BY101   304  C~5Zef      
2022 04  09.05089  09 08 07.653  +27 07 33.16  25.1r 20BY101   304  C~5Zef      

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    -0.04       0.00    -0.06
     2   0.0006    -12.55     0.01       0.25    -0.01
     3   0.8952   4280.84     0.36    -290.19    -0.13
     4   0.8953   4280.17 (   0.73)   -289.94 (  -0.10)
     5   0.8979   4245.75    -0.37    -282.55     0.17
     6   0.8980   4244.78    -0.06    -282.21     0.25
     7   0.9771   2958.69     0.11    -133.28    -0.22
     8   0.9798   2908.48     0.02    -130.47     0.05
     9   2.2031   1877.15     0.00    -623.21     0.15
    10   2.2059   1859.50    -0.03    -633.70    -0.19

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.

20BY101    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        52.483    54.609    51.120
ecceobj         0.285     0.344     0.236
incobj         10.547    10.549    10.545
qmin           36.611    35.008    38.382
qmax           69.104    75.296    64.535
amean          52.482    54.653    51.128
amin           51.915    53.991    50.638
amax           53.179    55.546    51.702
emean           0.286     0.344     0.235
emin            0.272     0.330     0.224
emax            0.300     0.359     0.248
imean          10.342    10.381    10.413
imin            9.772     9.663    10.023
imax           10.880    11.259    10.861
excite_mean     0.337     0.388     0.296
fracstop        1.000     1.000     1.000
cjmean          3.063     3.039     3.080

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       186.0     178.3     189.8
kozaiamp        180.0     180.0     180.0