Orbit Fit and Astrometric record for 20BW6

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: 20BW6     
# Created Tue Dec  7 02:14:15 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     52 observations of     52
# Arc:   3.44y
# First observation: 2017/10/30
#  Last observation: 2021/04/07
# Chi-squared of fit:    73.03 DOF:     98 RMS:  0.21
# Min/Max residuals:    -0.50    0.84
# Exact a, adot, b, bdot, g, gdot:
  4.027805E-05  3.961820E-01 -6.476292E-07 -1.986994E-02  1.557618E-01 -1.351236E-01
# Covariance matrix:
  8.1875E-11 -7.6961E-09 -3.4627E-12  1.5089E-10 -4.9055E-10  1.1662E-08
 -7.6961E-09  9.1312E-07  3.2586E-10 -1.7981E-08  4.6166E-08 -1.3960E-06
 -3.4627E-12  3.2586E-10  4.5677E-13 -6.6777E-12  2.0826E-11 -4.9375E-10
  1.5089E-10 -1.7981E-08 -6.6777E-12  1.5611E-09 -9.0513E-10  2.7531E-08
 -4.9055E-10  4.6166E-08  2.0826E-11 -9.0513E-10  2.9504E-09 -6.9952E-08
  1.1662E-08 -1.3960E-06 -4.9375E-10  2.7531E-08 -6.9952E-08  2.1378E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.442726   73.466185    0.589337   -0.020125   -0.805360  2458057.070579
# Heliocentric elements and errors
Epoch:              2458056.5000  =  2017/10/30
Mean Anomaly:          332.45266 +/-     0.001
Argument of Peri:      279.65396 +/-     0.000
Long of Asc Node:      225.84400 +/-     0.000
Inclination:             3.27581 +/-     0.000
Eccentricity:         0.49871838 +/-    0.0000
Semi-Major Axis:     10.75051161 +/-    0.0000
Time of Perihelion: 2459041.6883 +/-       0.0
Perihelion:           5.38903384 +/-    0.0000
Aphelion:            16.11198937 +/-    0.0000
Period (y)               35.2494 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            2.61828018 +/-    0.0000
Ecliptic Y            6.75150763 +/-    0.0000
Ecliptic Z           -0.16167609 +/-    0.0000
Ecliptic XDOT        -0.00734867 +/-    0.0000
Ecliptic YDOT        -0.00030826 +/-    0.0000
Ecliptic ZDOT        -0.00028947 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO    7.24333689 +/-    0.0000
Geocenter to KBO      6.42017861 +/-    0.0000
# Hcoef: 14.71

The following table shows the complete astrometric record for 20BW6. 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 (20BW6) followed by the observatory code and reference code for the source of the astrometry.

2017 10  30.569778 04 49 02.392  +20 59 02.77  22.9G 20BW6     F51  C~3d4E      
2017 10  30.582453 04 49 02.189  +20 59 02.74  22.7G 20BW6     F51  C~3d4E      
2017 10  30.583094 04 49 02.178  +20 59 02.29  22.5G 20BW6     F51  C~3d4E      
2017 10  30.595079 04 49 01.974  +20 59 01.83  23.1G 20BW6     F51  C~3d4E      
2017 10  30.607691 04 49 01.726  +20 59 00.81  22.0G 20BW6     F51  C~3d4E      
2017 11  21.368094 04 41 39.026  +20 39 19.98  23.5G 20BW6     F51  C~3d4E      
2017 11  21.381095 04 41 38.678  +20 39 19.18  23.4G 20BW6     F51  C~3d4E      
2017 11  21.394210 04 41 38.393  +20 39 18.68  22.7G 20BW6     F51  C~3d4E      
2017 11  21.407426 04 41 38.051  +20 39 18.07  22.2G 20BW6     F51  C~3d4E      
2017 12  10.287737 04 33 53.682  +20 19 56.20  22.7G 20BW6     F51  C~3d4E      
2017 12  10.300182 04 33 53.345  +20 19 54.94  22.3G 20BW6     F51  C~3d4E      
2017 12  10.312590 04 33 53.071  +20 19 54.27  23.0G 20BW6     F51  C~3d4E      
2017 12  10.324985 04 33 52.744  +20 19 53.80  23.1G 20BW6     F51  C~3d4E      
2019 11  04.602274 08 54 45.000  +14 03 09.34  22.3G 20BW6     F51  C~3d4E      
2019 11  04.613364 08 54 45.232  +14 03 07.86  22.2G 20BW6     F51  C~3d4E      
2019 11  04.624562 08 54 45.463  +14 03 06.48  22.4G 20BW6     F51  C~3d4E      
2019 11  27.563514 08 59 59.060  +13 25 11.63  22.1G 20BW6     F51  C~3d4E      
2019 11  27.574712 08 59 59.104  +13 25 10.96  22.7G 20BW6     F51  C~3d4E      
2019 11  27.585869 08 59 59.168  +13 25 10.16  22.4G 20BW6     F51  C~3d4E      
2019 11  27.597119 08 59 59.230  +13 25 09.63  22.9G 20BW6     F51  C~3d4E      
2019 11  29.531383 09 00 09.003  +13 23 06.26  22.7G 20BW6     F52  C~3d4E      
2020 01  01.567363 08 56 14.137  +13 18 43.87  21.9G 20BW6     F51  C~3d4E      
2020 01  01.580972 08 56 13.885  +13 18 44.43  21.8G 20BW6     F51  C~3d4E      
2020 01  01.594506 08 56 13.651  +13 18 44.99  22.1G 20BW6     F51  C~3d4E      
2020 01  17.383058 08 50 38.396  +13 35 37.82  21.8G 20BW6     F51  C~3d4E      
2020 01  21.385765 08 48 59.549  +13 41 20.02  21.6G 20BW6     F52  C~3d4E      
2020 01  21.397587 08 48 59.256  +13 41 20.92  22.1G 20BW6     F52  C~3d4E      
2020 01  21.410014 08 48 58.935  +13 41 21.96  22.4G 20BW6     F52  C~3d4E      
2020 01  21.422252 08 48 58.599  +13 41 23.13  21.7G 20BW6     F52  C~3d4E      
2020 01  23.376228 08 48 09.120  +13 44 19.75  21.7G 20BW6     F51  C~3d4E      
2020 01  23.387059 08 48 08.841  +13 44 20.85  21.7G 20BW6     F51  C~3d4E      
2020 01  23.397843 08 48 08.560  +13 44 21.76  21.9G 20BW6     F51  C~3d4E      
2020 01  23.408632 08 48 08.262  +13 44 22.78  22.0G 20BW6     F51  C~3d4E      
2020 01  24.338832 08 47 44.519  +13 45 48.77  22.1w 20BW6     F51  C~3d4E      
2020 01  24.348869 08 47 44.268  +13 45 49.79  21.9w 20BW6     F51  C~3d4E      
2020 01  24.358902 08 47 44.000  +13 45 50.70  21.9w 20BW6     F51  C~3d4E      
2020 01  24.368913 08 47 43.738  +13 45 51.81  21.9w 20BW6     F51  C~3d4E      
2020 01  25.33916  08 47 18.69   +13 47 22.3   21.4G 20BW6     G96  C~3d4E      
2020 01  25.34427  08 47 18.57   +13 47 22.5   21.9G 20BW6     G96  C~3d4E      
2020 01  25.34937  08 47 18.43   +13 47 23.7   22.2G 20BW6     G96  C~3d4E      
2020 01  25.35448  08 47 18.29   +13 47 24.4   21.2G 20BW6     G96  C~3d4E      
2020 01  25.509308 08 47 14.297  +13 47 38.93  22.0w 20BW6     F51  C~3d4E      
2020 01  25.522696 08 47 13.937  +13 47 40.16  21.6w 20BW6     F51  C~3d4E      
2020 01  25.536126 08 47 13.590  +13 47 41.50  21.5w 20BW6     F51  C~3d4E      
2020 01  25.549550 08 47 13.232  +13 47 42.67  21.9w 20BW6     F51  C~3d4E      
2020 02  01.26544  08 44 18.74   +13 58 42.2   21.5G 20BW6     G96  C~3d4E      
2020 02  01.27103  08 44 18.56   +13 58 42.8   21.9G 20BW6     G96  C~3d4E      
2020 02  01.27663  08 44 18.41   +13 58 43.9   21.9G 20BW6     G96  C~3d4E      
2020 02  01.28222  08 44 18.35   +13 58 43.8   20.9G 20BW6     G96  C~3d4E      
2021 04  07.35073  11 01 42.105  +02 46 53.80  22.1w 20BW6     F51  C~4iTc      
2021 04  07.36285  11 01 41.918  +02 46 55.25  22.2w 20BW6     F51  C~4iTc      
2021 04  07.37495  11 01 41.729  +02 46 57.10  22.2w 20BW6     F51  C~4iTc      

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     0.02       0.00    -0.28
     2   0.0000      0.00     0.14       0.00     0.30
     3   0.0000      0.00     0.14       0.00    -0.12
     4   0.0001      0.00     0.07       0.00    -0.01
     5   0.0001      0.00    -0.50       0.00    -0.42
     6   0.0597      0.00     0.30       0.00    -0.13
     7   0.0597      0.00    -0.21       0.00    -0.17
     8   0.0598      0.00     0.27       0.00     0.10
     9   0.0598      0.00    -0.06       0.00     0.27
    10   0.1115      0.00     0.04       0.00     0.36
    11   0.1115      0.00    -0.33       0.00    -0.16
    12   0.1115      0.00     0.23       0.00    -0.09
    13   0.1116      0.00    -0.01       0.00     0.17
    14   2.0124      0.00    -0.14       0.00     0.18
    15   2.0124      0.00    -0.09       0.00     0.11
    16   2.0125      0.00    -0.09       0.00     0.15
    17   2.0753      0.00     0.21       0.00    -0.06
    18   2.0753      0.00     0.02       0.00     0.01
    19   2.0753      0.00     0.13       0.00    -0.05
    20   2.0754      0.00     0.21       0.00     0.17
    21   2.0807      0.00     0.11       0.00     0.48
    22   2.1711      0.00     0.01       0.00     0.03
    23   2.1711      0.00    -0.02       0.00     0.00
    24   2.1712      0.00     0.20       0.00    -0.02
    25   2.2144      0.00    -0.08       0.00     0.06
    26   2.2254      0.00    -0.05       0.00     0.14
    27   2.2254      0.00     0.14       0.00    -0.03
    28   2.2254      0.00     0.15       0.00    -0.10
    29   2.2255      0.00    -0.14       0.00    -0.03
    30   2.2308      0.00    -0.06       0.00    -0.06
    31   2.2308      0.00     0.01       0.00     0.03
    32   2.2309      0.00     0.04       0.00    -0.07
    33   2.2309      0.00    -0.19       0.00    -0.05
    34   2.2335      0.00    -0.06       0.00    -0.08
    35   2.2335      0.00     0.13       0.00    -0.01
    36   2.2335      0.00     0.06       0.00    -0.05
    37   2.2335      0.00     0.08       0.00     0.11
    38   2.2362      0.00    -0.28       0.00    -0.18
    39   2.2362      0.00    -0.05       0.00    -0.46
    40   2.2362      0.00    -0.12       0.00     0.26
    41   2.2362      0.00    -0.19       0.00     0.48
    42   2.2367      0.00     0.16       0.00    -0.01
    43   2.2367      0.00     0.09       0.00    -0.04
    44   2.2367      0.00     0.22       0.00     0.05
    45   2.2368      0.00     0.18       0.00    -0.03
    46   2.2552      0.00    -0.03       0.00    -0.30
    47   2.2552      0.00    -0.49       0.00    -0.27
    48   2.2552      0.00    -0.50       0.00     0.26
    49   2.2552      0.00     0.84       0.00    -0.41
    50   3.4354      0.00    -0.07       0.00    -0.04
    51   3.4354      0.00     0.01       0.00    -0.16
    52   3.4355      0.00     0.04       0.00     0.12

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.

20BW6    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        10.784    10.784    10.784
ecceobj         0.498     0.498     0.498
incobj          3.265     3.265     3.265
qmin            5.417     5.417     5.417
qmax           16.151    16.151    16.151
amean          10.784    10.784    10.784
amin           10.784    10.784    10.784
amax           10.784    10.784    10.784
emean           0.498     0.498     0.498
emin            0.498     0.498     0.498
emax            0.498     0.498     0.498
imean           4.253     4.253     4.253
imin            4.253     4.253     4.253
imax            4.253     4.253     4.253
excite_mean     0.503     0.503     0.503
fracstop        0.000     0.000     0.000
cjmean          3.827     3.827     3.827

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       278.9     278.9     278.9
kozaiamp          0.0       0.0       0.0