Orbit Fit and Astrometric record for 20BG60

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: 20BG60    
# Created Sat Dec  4 02:14:06 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     47 observations of     47
# Arc:   7.71y
# First observation: 2013/05/03
#  Last observation: 2021/01/18
# Chi-squared of fit:    57.42 DOF:     88 RMS:  0.20
# Min/Max residuals:    -0.46    0.50
# Exact a, adot, b, bdot, g, gdot:
  2.276772E-05  7.048493E-02  8.872071E-06  2.708209E-02  4.799678E-02  1.130508E-04
# Covariance matrix:
  3.7260E-13 -1.2836E-13  7.8080E-14 -4.0434E-14 -1.1429E-13 -1.6338E-13
 -1.2836E-13  6.4263E-14 -3.7399E-14  2.2234E-14  2.1554E-14  8.3339E-14
  7.8080E-14 -3.7399E-14  1.4156E-13 -3.4096E-14 -2.6479E-14 -5.4272E-14
 -4.0434E-14  2.2234E-14 -3.4096E-14  1.2672E-14  8.3052E-15  3.1010E-14
 -1.1429E-13  2.1554E-14 -2.6479E-14  8.3052E-15  1.0137E-13  4.5818E-14
 -1.6338E-13  8.3339E-14 -5.4272E-14  3.1010E-14  4.5818E-14  1.1871E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.142014  102.535906   -0.871832   -0.027943    0.509618  2456415.764543
# Heliocentric elements and errors
Epoch:              2456416.5000  =  2013/05/04
Mean Anomaly:            5.96228 +/-     0.001
Argument of Peri:      357.91312 +/-     0.001
Long of Asc Node:       96.61829 +/-     0.000
Inclination:            21.10661 +/-     0.000
Eccentricity:         0.28194882 +/-    0.0000
Semi-Major Axis:     28.21960051 +/-    0.0012
Time of Perihelion: 2455509.6524 +/-       0.1
Perihelion:          20.26311757 +/-    0.0011
Aphelion:            36.17608344 +/-    0.0016
Period (y)              149.9113 +/-      0.01
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           -5.25561595 +/-    0.0000
Ecliptic Y           19.62244195 +/-    0.0001
Ecliptic Z            1.14218437 +/-    0.0000
Ecliptic XDOT        -0.00391412 +/-    0.0000
Ecliptic YDOT        -0.00094895 +/-    0.0000
Ecliptic ZDOT         0.00154300 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   20.34614029 +/-    0.0001
Geocenter to KBO     20.83476612 +/-    0.0001
# Hcoef:  9.96

The following table shows the complete astrometric record for 20BG60. 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 (20BG60) followed by the observatory code and reference code for the source of the astrometry.

2013 05  03.263765 06 55 48.071  +25 58 34.52  23.8G 20BG60    F51  C~4Zh2      
2013 12  04.433030 07 25 24.671  +26 20 45.11  22.6G 20BG60    F51  C~4Zh2      
2013 12  04.446985 07 25 24.548  +26 20 45.10  22.5G 20BG60    F51  C~4Zh2      
2014 01  24.302169 07 17 12.977  +26 51 53.21  23.2G 20BG60    F51  C~4Zh2      
2014 01  24.313425 07 17 12.851  +26 51 53.50  23.3G 20BG60    F51  C~4Zh2      
2014 12  26.552741 07 42 25.066  +27 29 55.66  23.3G 20BG60    F51  C~4Zh2      
2014 12  26.565096 07 42 24.976  +27 29 55.85  23.6G 20BG60    F51  C~4Zh2      
2015 01  22.297652 07 37 53.043  +27 47 58.85  22.6G 20BG60    F51  C~4Zh2      
2015 01  22.309524 07 37 52.921  +27 47 59.43  22.3G 20BG60    F51  C~4Zh2      
2015 01  22.321427 07 37 52.819  +27 47 59.72  22.8G 20BG60    F51  C~4Zh2      
2015 01  22.333331 07 37 52.678  +27 48 00.38  22.1G 20BG60    F51  C~4Zh2      
2016 01  14.506971 07 59 39.218  +28 27 58.35  22.8G 20BG60    F51  C~4Zh2      
2016 01  14.520522 07 59 39.083  +28 27 58.87  22.3G 20BG60    F51  C~4Zh2      
2016 01  14.534081 07 59 38.944  +28 27 59.56  22.6G 20BG60    F51  C~4Zh2      
2016 02  04.319023 07 56 08.338  +28 41 27.87  22.6G 20BG60    F51  C~4Zh2      
2016 02  04.331101 07 56 08.248  +28 41 28.15  22.5G 20BG60    F51  C~4Zh2      
2016 02  09.300388 07 55 21.212  +28 44 01.66  22.9G 20BG60    F51  C~4Zh2      
2016 03  31.274270 07 50 51.051  +28 53 02.16  23.1G 20BG60    F51  C~4Zh2      
2017 02  21.287878 08 13 47.014  +29 25 27.64  23.2G 20BG60    F51  C~4Zh2      
2017 02  21.299528 08 13 46.938  +29 25 27.56  23.4G 20BG60    F51  C~4Zh2      
2017 02  21.311240 08 13 46.823  +29 25 28.15  23.1G 20BG60    F51  C~4Zh2      
2017 02  21.323030 08 13 46.703  +29 25 28.28  23.0G 20BG60    F51  C~4Zh2      
2017 12  13.476142 08 44 22.160  +28 52 02.28  22.4G 20BG60    F51  C~4Zh2      
2017 12  13.499992 08 44 21.978  +28 52 03.52  23.5G 20BG60    F51  C~4Zh2      
2017 12  13.511978 08 44 21.935  +28 52 03.97  23.1G 20BG60    F51  C~4Zh2      
2018 01  11.557912 08 40 33.792  +29 20 21.63  22.9G 20BG60    F51  C~4Zh2      
2018 01  11.569541 08 40 33.693  +29 20 21.72  22.5G 20BG60    F51  C~4Zh2      
2018 01  11.581192 08 40 33.572  +29 20 23.18  24.2G 20BG60    F51  C~4Zh2      
2018 01  11.592838 08 40 33.458  +29 20 23.71  22.8G 20BG60    F51  C~4Zh2      
2019 01  08.419449 09 00 55.582  +29 26 47.05  23.1G 20BG60    F51  C~4Zh2      
2019 01  08.431719 09 00 55.478  +29 26 47.88  23.3G 20BG60    F51  C~4Zh2      
2019 01  08.443976 09 00 55.384  +29 26 48.44  23.1G 20BG60    F51  C~4Zh2      
2019 11  07.629192 09 23 03.141  +28 27 40.75  23.5G 20BG60    F51  C~4Zh2      
2019 12  04.586115 09 23 24.818  +28 48 31.10  23.0G 20BG60    F51  C~4Zh2      
2020 01  24.36970  09 18 03.924  +29 42 06.07  23.0r 20BG60    568  C~4Zh2      
2020 01  24.60697  09 18 01.657  +29 42 20.39  22.9r 20BG60    568  C~4Zh2      
2020 01  31.412596 09 16 56.564  +29 48 52.12  23.6G 20BG60    F51  C~4Zh2      
2020 02  25.411568 09 12 57.601  +30 07 36.30  22.9G 20BG60    568  C~4Zh2      
2020 02  25.497173 09 12 56.832  +30 07 39.30  23.0G 20BG60    568  C~4Zh2      
2020 03  24.320785 09 09 32.370  +30 15 45.77  23.2G 20BG60    568  C~4Zh2      
2020 03  24.391840 09 09 31.973  +30 15 45.91  23.2G 20BG60    568  C~4Zh2      
2020 12  23.500565 09 40 51.567  +28 56 49.79  23.4G 20BG60    F51  C~4Zh2      
2020 12  23.511810 09 40 51.511  +28 56 50.24  22.8G 20BG60    F51  C~4Zh2      
2020 12  23.522853 09 40 51.457  +28 56 51.19  23.0G 20BG60    F51  C~4Zh2      
2020 12  23.533998 09 40 51.427  +28 56 51.67  22.6G 20BG60    F51  C~4Zh2      
2021 01  17.25497  09 38 04.603  +29 24 49.01  23.1r 20BG60    304  C~4Zh2      
2021 01  18.25228  09 37 56.204  +29 25 55.27  23.0r 20BG60    304  C~4Zh2      

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     0.10       0.00     0.00
     2   0.5891      0.00     0.28       0.00     0.23
     3   0.5891      0.00     0.04       0.00    -0.34
     4   0.7284      0.00    -0.01       0.00     0.16
     5   0.7284      0.00    -0.20       0.00     0.11
     6   1.6490      0.00    -0.28       0.00     0.33
     7   1.6490      0.00     0.17       0.00    -0.02
     8   1.7222      0.00    -0.20       0.00    -0.25
     9   1.7222      0.00    -0.18       0.00    -0.10
    10   1.7223      0.00     0.14       0.00    -0.24
    11   1.7223      0.00    -0.12       0.00    -0.01
    12   2.7002      0.00    -0.04       0.00    -0.14
    13   2.7002      0.00     0.06       0.00    -0.21
    14   2.7003      0.00     0.10       0.00    -0.12
    15   2.7572      0.00    -0.43       0.00     0.09
    16   2.7572      0.00     0.01       0.00    -0.03
    17   2.7708      0.00     0.06       0.00    -0.26
    18   2.9104      0.00     0.12       0.00     0.02
    19   3.8057      0.00     0.06       0.00     0.10
    20   3.8057      0.00     0.39       0.00    -0.26
    21   3.8057      0.00     0.14       0.00     0.06
    22   3.8058      0.00    -0.17       0.00    -0.09
    23   4.6139      0.00     0.16       0.00     0.50
    24   4.6139      0.00    -0.46       0.00     0.34
    25   4.6140      0.00    -0.05       0.00     0.09
    26   4.6935      0.00    -0.04       0.00     0.24
    27   4.6935      0.00     0.16       0.00    -0.32
    28   4.6935      0.00     0.03       0.00     0.50
    29   4.6936      0.00     0.01       0.00     0.38
    30   5.6842      0.00     0.00       0.00     0.01
    31   5.6842      0.00     0.06       0.00     0.07
    32   5.6843      0.00     0.27       0.00    -0.13
    33   6.5143      0.00     0.19       0.00     0.08
    34   6.5882      0.00     0.22       0.00    -0.23
    35   6.7272      0.00     0.02       0.00    -0.07
    36   6.7278      0.00     0.10       0.00     0.10
    37   6.7465      0.00    -0.35       0.00    -0.38
    38   6.8149      0.00    -0.19       0.00    -0.14
    39   6.8151      0.00     0.03       0.00     0.09
    40   6.8913      0.00     0.00       0.00    -0.03
    41   6.8915      0.00    -0.09       0.00     0.01
    42   7.6420      0.00    -0.13       0.00     0.10
    43   7.6420      0.00    -0.13       0.00    -0.20
    44   7.6421      0.00    -0.11       0.00     0.01
    45   7.6421      0.00     0.28       0.00    -0.26
    46   7.7098      0.00     0.17       0.00    -0.00
    47   7.7125      0.00    -0.11       0.00     0.13

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.

20BG60    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        28.264    28.264    28.265
ecceobj         0.282     0.282     0.282
incobj         21.116    21.116    21.116
qmin           20.124    20.077    20.089
qmax           36.223    36.424    36.925
amean          27.899    27.773    28.082
amin           27.237    27.188    27.436
amax           28.376    28.366    28.672
emean           0.266     0.268     0.277
emin            0.247     0.236     0.262
emax            0.282     0.284     0.291
imean          20.139    20.090    19.994
imin           19.568    19.568    19.568
imax           20.562    20.782    20.341
excite_mean     0.435     0.436     0.440
fracstop        0.010     0.010     0.010
cjmean          2.819     2.819     2.814

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        38.2      39.2      40.5
kozaiamp        179.4     179.4     179.4