Orbit Fit and Astrometric record for 20DD5

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: 20DD5     
# Created Fri Dec  3 02:14:03 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     61 observations of     61
# Arc:   5.01y
# First observation: 2015/03/11
#  Last observation: 2020/03/13
# Chi-squared of fit:    66.46 DOF:    116 RMS:  0.18
# Min/Max residuals:    -0.77    0.87
# Exact a, adot, b, bdot, g, gdot:
  2.691597E-05  9.247290E-02  1.743542E-06  4.635269E-03  5.460324E-02 -2.171434E-02
# Covariance matrix:
  2.6915E-13 -1.6900E-13  6.4979E-15 -6.8665E-15 -7.0706E-14 -2.2080E-13
 -1.6900E-13  1.5516E-13 -7.0825E-15  6.9589E-15  1.1616E-14  2.2190E-13
  6.4979E-15 -7.0825E-15  8.6798E-14 -2.2275E-14  3.2086E-16 -1.0618E-14
 -6.8665E-15  6.9589E-15 -2.2275E-14  7.5277E-15  4.6531E-16  1.0436E-14
 -7.0706E-14  1.1616E-14  3.2086E-16  4.6531E-16  9.6704E-14  1.7819E-14
 -2.2080E-13  2.2190E-13 -1.0618E-14  1.0436E-14  1.7819E-14  3.3280E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -2.473165  119.705578   -0.761796   -0.027115   -0.631876  2457092.631572
# Heliocentric elements and errors
Epoch:              2457092.5000  =  2015/03/11
Mean Anomaly:          349.60958 +/-     0.001
Argument of Peri:      354.62909 +/-     0.002
Long of Asc Node:      160.91946 +/-     0.000
Inclination:             3.80004 +/-     0.000
Eccentricity:         0.49070620 +/-    0.0000
Semi-Major Axis:     35.18748516 +/-    0.0018
Time of Perihelion: 2459292.9500 +/-       5.8
Perihelion:          17.92076800 +/-    0.0012
Aphelion:            52.45420232 +/-    0.0028
Period (y)              208.7327 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -10.04551219 +/-    0.0001
Ecliptic Y           16.06442946 +/-    0.0001
Ecliptic Z           -0.79027387 +/-    0.0000
Ecliptic XDOT        -0.00349675 +/-    0.0000
Ecliptic YDOT        -0.00323949 +/-    0.0000
Ecliptic ZDOT         0.00027927 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   18.96328927 +/-    0.0001
Geocenter to KBO     18.31408075 +/-    0.0001
# Hcoef: 10.11

The following table shows the complete astrometric record for 20DD5. 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 (20DD5) followed by the observatory code and reference code for the source of the astrometry.

2015 03  11.130794 08 05 19.01   +17 47 37.2         20DD5     W84  C~3qVF      
2015 03  11.132858 08 05 19.01   +17 47 37.0         20DD5     W84  C~3qVF      
2016 01  03.414866 08 37 34.579  +16 10 40.82  22.7G 20DD5     F51  C~3nVn      
2016 01  03.426499 08 37 34.476  +16 10 41.15  22.6G 20DD5     F51  C~3nVn      
2016 01  03.438132 08 37 34.360  +16 10 41.59  22.3G 20DD5     F51  C~3nVn      
2016 01  03.449819 08 37 34.263  +16 10 42.03  22.7G 20DD5     F51  C~3nVn      
2016 01  07.391008 08 36 59.590  +16 12 51.66  22.1G 20DD5     F51  C~3nVn      
2016 01  07.403482 08 36 59.446  +16 12 52.08  22.7G 20DD5     F51  C~3nVn      
2016 01  07.415944 08 36 59.346  +16 12 52.43  22.6G 20DD5     F51  C~3nVn      
2016 01  07.428442 08 36 59.223  +16 12 52.99  22.4G 20DD5     F51  C~3nVn      
2016 02  09.331403 08 31 40.496  +16 33 51.63  22.9G 20DD5     F51  C~3nVn      
2016 02  09.343666 08 31 40.375  +16 33 51.94  22.8G 20DD5     F51  C~3nVn      
2016 02  09.355822 08 31 40.266  +16 33 52.22  22.2G 20DD5     F51  C~3nVn      
2016 03  03.240114 08 28 26.784  +16 47 54.79  22.5G 20DD5     F51  C~3nVn      
2016 03  03.251759 08 28 26.714  +16 47 55.09  22.7G 20DD5     F51  C~3nVn      
2016 03  03.265247 08 28 26.600  +16 47 55.61  23.6G 20DD5     F51  C~3nVn      
2016 03  03.276928 08 28 26.534  +16 47 55.77  23.2G 20DD5     F51  C~3nVn      
2016 04  28.258837 08 26 53.051  +17 02 14.89  22.6G 20DD5     F51  C~3nVn      
2016 05  02.256654 08 27 11.586  +17 01 50.20  22.2G 20DD5     F51  C~3nVn      
2017 01  26.381082 08 57 02.391  +15 13 46.97  22.7G 20DD5     F51  C~3nVn      
2017 01  26.391847 08 57 02.289  +15 13 47.50  22.3G 20DD5     F51  C~3nVn      
2017 01  26.402639 08 57 02.177  +15 13 47.96  22.0G 20DD5     F51  C~3nVn      
2017 01  26.413564 08 57 02.085  +15 13 48.38  21.9G 20DD5     F51  C~3nVn      
2017 02  04.515998 08 55 32.322  +15 20 31.94  22.4G 20DD5     F51  C~3nVn      
2017 02  04.528536 08 55 32.196  +15 20 32.17  22.2G 20DD5     F51  C~3nVn      
2017 02  04.541066 08 55 32.087  +15 20 32.74  22.1G 20DD5     F51  C~3nVn      
2017 02  04.553582 08 55 31.957  +15 20 33.13  23.3G 20DD5     F51  C~3nVn      
2018 01  16.415190 09 22 07.963  +13 43 43.82  22.0G 20DD5     F51  C~3nVn      
2018 01  16.427044 09 22 07.848  +13 43 44.30  22.4G 20DD5     F51  C~3nVn      
2018 01  16.438886 09 22 07.750  +13 43 44.84  22.5G 20DD5     F51  C~3nVn      
2018 01  16.450715 09 22 07.648  +13 43 45.37  22.7G 20DD5     F51  C~3nVn      
2018 03  07.237739 09 14 25.653  +14 22 40.92  22.3G 20DD5     F51  C~3nVn      
2018 03  07.249367 09 14 25.597  +14 22 41.19  22.6G 20DD5     F51  C~3nVn      
2018 03  07.260995 09 14 25.492  +14 22 42.08  22.8G 20DD5     F51  C~3nVn      
2018 03  07.272626 09 14 25.400  +14 22 42.48  22.9G 20DD5     F51  C~3nVn      
2018 03  17.264589 09 13 12.783  +14 29 20.19  22.1G 20DD5     F51  C~3nVn      
2019 01  03.582516 09 47 16.773  +12 02 35.92  22.7G 20DD5     F51  C~3nVn      
2019 01  03.594276 09 47 16.698  +12 02 36.28  22.9G 20DD5     F51  C~3nVn      
2019 01  03.605992 09 47 16.623  +12 02 36.60  22.1G 20DD5     F51  C~3nVn      
2019 01  03.617761 09 47 16.540  +12 02 36.93  22.3G 20DD5     F51  C~3nVn      
2019 01  10.449639 09 46 30.958  +12 06 39.44  23.0G 20DD5     F51  C~3nVn      
2019 01  10.461469 09 46 30.888  +12 06 39.98  22.9G 20DD5     F51  C~3nVn      
2019 01  10.473333 09 46 30.804  +12 06 40.57  22.6G 20DD5     F51  C~3nVn      
2019 01  10.485129 09 46 30.720  +12 06 40.88  22.3G 20DD5     F51  C~3nVn      
2020 01  19.449840 10 08 59.240  +10 31 12.61  22.5G 20DD5     F51  C~3nVn      
2020 01  19.462695 10 08 59.142  +10 31 13.23  22.7G 20DD5     F51  C~3nVn      
2020 01  19.475592 10 08 59.047  +10 31 13.71  22.3G 20DD5     F51  C~3nVn      
2020 01  19.488515 10 08 58.936  +10 31 14.32  22.3G 20DD5     F51  C~3nVn      
2020 01  21.590256 10 08 42.882  +10 32 48.48  23.2G 20DD5     F51  C~3nVn      
2020 01  21.602574 10 08 42.770  +10 32 49.24  23.1G 20DD5     F51  C~3nVn      
2020 01  21.614931 10 08 42.674  +10 32 49.86  22.5G 20DD5     F51  C~3nVn      
2020 02  29.36104  10 02 49.96   +11 07 27.3   22.3G 20DD5     V00  C~3nVn      
2020 02  29.36739  10 02 49.88   +11 07 27.5   22.6G 20DD5     V00  C~3nVn      
2020 02  29.37374  10 02 49.82   +11 07 27.9   22.3G 20DD5     V00  C~3nVn      
2020 02  29.38008  10 02 49.77   +11 07 28.6   21.8G 20DD5     V00  C~3nVn      
2020 03  03.12582  10 02 24.42   +11 09 59.9   21.7G 20DD5     807  C~3nVn      
2020 03  03.13768  10 02 24.30   +11 10 00.6   21.6G 20DD5     807  C~3nVn      
2020 03  03.14957  10 02 24.18   +11 10 01.3   21.9G 20DD5     807  C~3nVn      
2020 03  13.07727  10 00 56.98   +11 18 44.7   23.0G 20DD5     807  C~3nVn      
2020 03  13.08915  10 00 56.92   +11 18 44.8   23.1G 20DD5     807  C~3nVn      
2020 03  13.10102  10 00 56.77   +11 18 45.8   23.0G 20DD5     807  C~3nVn      

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    -0.05       0.00    -0.08
     2   0.0000      0.00     0.11       0.00    -0.32
     3   0.8167      0.00     0.12       0.00    -0.01
     4   0.8167      0.00     0.10       0.00    -0.05
     5   0.8167      0.00    -0.11       0.00     0.01
     6   0.8168      0.00    -0.02       0.00     0.07
     7   0.8275      0.00     0.28       0.00    -0.01
     8   0.8276      0.00    -0.17       0.00    -0.01
     9   0.8276      0.00     0.04       0.00    -0.09
    10   0.8276      0.00    -0.08       0.00     0.04
    11   0.9177      0.00    -0.11       0.00     0.00
    12   0.9178      0.00    -0.14       0.00    -0.18
    13   0.9178      0.00    -0.00       0.00    -0.38
    14   0.9804      0.00    -0.14       0.00     0.27
    15   0.9805      0.00     0.07       0.00     0.18
    16   0.9805      0.00    -0.18       0.00     0.26
    17   0.9806      0.00     0.10       0.00     0.03
    18   1.1338      0.00     0.25       0.00    -0.34
    19   1.1448      0.00    -0.19       0.00     0.87
    20   1.8816      0.00    -0.06       0.00    -0.05
    21   1.8816      0.00     0.03       0.00     0.01
    22   1.8816      0.00    -0.04       0.00    -0.01
    23   1.8817      0.00     0.22       0.00    -0.07
    24   1.9066      0.00    -0.18       0.00     0.22
    25   1.9066      0.00    -0.19       0.00    -0.11
    26   1.9067      0.00     0.06       0.00    -0.09
    27   1.9067      0.00    -0.01       0.00    -0.25
    28   2.8536      0.00     0.04       0.00     0.02
    29   2.8537      0.00    -0.10       0.00    -0.01
    30   2.8537      0.00     0.01       0.00     0.03
    31   2.8537      0.00     0.06       0.00     0.05
    32   2.9900      0.00    -0.34       0.00    -0.05
    33   2.9901      0.00     0.23       0.00    -0.28
    34   2.9901      0.00     0.07       0.00     0.11
    35   2.9901      0.00     0.11       0.00     0.01
    36   3.0175      0.00     0.08       0.00     0.05
    37   3.8178      0.00     0.08       0.00     0.18
    38   3.8178      0.00     0.07       0.00     0.15
    39   3.8179      0.00     0.06       0.00     0.10
    40   3.8179      0.00    -0.07       0.00     0.05
    41   3.8366      0.00    -0.22       0.00    -0.05
    42   3.8366      0.00     0.04       0.00     0.03
    43   3.8367      0.00     0.09       0.00     0.16
    44   3.8367      0.00     0.14       0.00     0.01
    45   4.8606      0.00     0.03       0.00    -0.01
    46   4.8606      0.00     0.04       0.00     0.04
    47   4.8606      0.00     0.11       0.00    -0.05
    48   4.8607      0.00    -0.07       0.00    -0.01
    49   4.8664      0.00     0.14       0.00     0.04
    50   4.8665      0.00    -0.07       0.00     0.25
    51   4.8665      0.00    -0.04       0.00     0.31
    52   4.9726      0.00     0.29       0.00     0.10
    53   4.9726      0.00    -0.00       0.00    -0.05
    54   4.9726      0.00    -0.00       0.00    -0.00
    55   4.9726      0.00     0.15       0.00     0.35
    56   4.9801      0.00     0.04       0.00    -0.05
    57   4.9802      0.00    -0.10       0.00     0.00
    58   4.9802      0.00    -0.23       0.00     0.05
    59   5.0074      0.00    -0.27       0.00    -0.27
    60   5.0074      0.00     0.35       0.00    -0.77
    61   5.0074      0.00    -0.38       0.00    -0.37

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.

20DD5    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        35.036    35.036    35.036
ecceobj         0.486     0.486     0.486
incobj          3.802     3.802     3.802
qmin           18.020    18.020    18.019
qmax           52.053    52.052    52.054
amean          35.036    35.036    35.036
amin           35.036    35.036    35.036
amax           35.036    35.036    35.036
emean           0.486     0.486     0.486
emin            0.486     0.486     0.486
emax            0.486     0.486     0.486
imean           3.122     3.122     3.122
imin            3.122     3.122     3.122
imax            3.122     3.122     3.122
excite_mean     0.489     0.489     0.489
fracstop        0.000     0.000     0.000
cjmean          2.744     2.744     2.744

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       354.3     354.3     354.3
kozaiamp          0.0       0.0       0.0