Orbit Fit and Astrometric record for 20BS60

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: 20BS60    
# Created Tue Apr  1 01:11:18 2025
# Orbit generated from Bernstein formalism
# Fitting      5 observations of      5
# Arc:   0.97y
# First observation: 2020/01/26
#  Last observation: 2021/01/15
Preliminary a, adot, b, bdot, g, gdot:
  -0.000000   0.009761  -0.000000   0.002772   0.015269   0.000000
# WARNING Fitting with energy constraint
# Chi-squared of fit:     1.08 DOF:      5 RMS:  0.08
# Min/Max residuals:    -0.11    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.027518E-05  9.677130E-03  2.798427E-06  2.758418E-03  1.530471E-02 -6.394771E-03
# Covariance matrix:
  9.3192E-13  1.8692E-11 -1.1356E-14  5.1531E-12  2.3016E-11  1.9573E-09
  1.8692E-11  1.9131E-09 -1.1150E-12  5.0549E-10  2.2584E-09  1.9201E-07
 -1.1356E-14 -1.1150E-12  7.3388E-13 -1.0944E-12 -1.3423E-12 -1.1279E-10
  5.1531E-12  5.0549E-10 -1.0944E-12  1.3520E-10  5.9854E-10  5.0816E-08
  2.3016E-11  2.2584E-09 -1.3423E-12  5.9854E-10  2.6895E-09  2.2752E-07
  1.9573E-09  1.9201E-07 -1.1279E-10  5.0816E-08  2.2752E-07  1.9307E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
  -14.359451  122.250646   -0.051879   -0.245860   -0.960540  2458874.599181
# Heliocentric elements and errors
Epoch:              2458870.5000  =  2020/01/22
Mean Anomaly:          302.24862 +/-    42.052
Argument of Peri:       78.97528 +/-    17.666
Long of Asc Node:      162.57932 +/-     0.163
Inclination:            21.30069 +/-     0.066
Eccentricity:         0.53750454 +/-    0.2715
Semi-Major Axis:     67.21871613 +/-   27.9985
Time of Perihelion: 2491162.3990 +/-   12075.5
Perihelion:          31.08835105 +/-   22.3796
Aphelion:           103.34908120 +/-   46.7577
Period (y)              551.1166 +/-    344.33
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -34.34693731 +/-    0.1144
Ecliptic Y           54.33572723 +/-    0.1814
Ecliptic Z          -16.20433762 +/-    0.0549
Ecliptic XDOT        -0.00092970 +/-    0.0004
Ecliptic YDOT        -0.00175528 +/-    0.0006
Ecliptic ZDOT         0.00076151 +/-    0.0002
# Distances at JD0 (AU)
Heliocenter to KBO   66.29226135 +/-    0.1606
Geocenter to KBO     65.33936769 +/-    0.2214
# Hcoef:  6.39

The following table shows the complete astrometric record for 20BS60. 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 (20BS60) followed by the observatory code and reference code for the source of the astrometry.

2020 01  26.09838  08 05 11.242  +05 38 40.96  24.6r 20BS60    807  C~4Zh3      
2020 01  27.11765  08 05 07.970  +05 38 54.01  24.7r 20BS60    807  C~4Zh3      
2020 12  16.24564  08 09 32.598  +05 35 49.77  24.3r 20BS60    304  C~4Zh3      
2020 12  17.26201  08 09 29.973  +05 35 51.87  24.4r 20BS60    304  C~4Zh3      
2021 01  15.14489  08 08 03.420  +05 38 53.31  24.5r 20BS60    304  C~4Zh3      

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    -0.06       0.00     0.01
     2   0.0028    -50.50     0.06       2.33    -0.02
     3   0.8902   3848.06    -0.00     668.60    -0.11
     4   0.8930   3809.32    -0.00     662.21     0.20
     5   0.9721   2508.14     0.01     561.84    -0.09

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.

20BS60    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