Orbit Fit and Astrometric record for 17DM121

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: 17DM121   
# Created Fri Mar 29 01:18:55 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     15 observations of     15
# Arc:   6.87y
# First observation: 2017/02/24
#  Last observation: 2024/01/09
# Chi-squared of fit:   126.25 DOF:     24 RMS:  0.51
# Min/Max residuals:    -0.75    1.34
# Exact a, adot, b, bdot, g, gdot:
  1.208017E-05  2.486678E-02 -3.311469E-06  1.049585E-03  2.467431E-02 -4.130394E-04
# Covariance matrix:
  3.5935E-13 -2.7463E-13  1.1887E-14 -8.7075E-15  2.7603E-13 -1.0088E-12
 -2.7463E-13  3.4702E-13 -1.2624E-14  1.2207E-14 -2.0595E-13  1.5115E-12
  1.1887E-14 -1.2624E-14  1.7499E-13 -3.4703E-14  3.8556E-14 -3.6531E-14
 -8.7075E-15  1.2207E-14 -3.4703E-14  1.5850E-14 -6.0120E-15  5.6710E-14
  2.7603E-13 -2.0595E-13  3.8556E-14 -6.0120E-15  1.5504E-12  3.4152E-14
 -1.0088E-12  1.5115E-12 -3.6531E-14  5.6710E-14  3.4152E-14  7.5544E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   10.167525  134.434402   -0.352630    0.163202   -0.909052  2457808.806091
# Heliocentric elements and errors
Epoch:              2457808.5000  =  2017/02/24
Mean Anomaly:          352.05963 +/-     0.088
Argument of Peri:       86.01982 +/-     0.102
Long of Asc Node:       58.29455 +/-     0.002
Inclination:            10.21237 +/-     0.000
Eccentricity:         0.07109133 +/-    0.0002
Semi-Major Axis:     44.57161746 +/-    0.0108
Time of Perihelion: 2460205.8094 +/-      46.8
Perihelion:          41.40296170 +/-    0.0127
Aphelion:            47.74027322 +/-    0.0140
Period (y)              297.5746 +/-      0.11
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -28.82972802 +/-    0.0014
Ecliptic Y           28.89262803 +/-    0.0014
Ecliptic Z            7.15413093 +/-    0.0004
Ecliptic XDOT        -0.00192108 +/-    0.0000
Ecliptic YDOT        -0.00198525 +/-    0.0000
Ecliptic ZDOT         0.00010647 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.43813857 +/-    0.0014
Geocenter to KBO     40.52803319 +/-    0.0020
# Hcoef:  7.36

The following table shows the complete astrometric record for 17DM121. 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 (17DM121) followed by the observatory code and reference code for the source of the astrometry.

2017 02  24.30529  09 20 42.242  +26 12 06.35  23.6r 17DM121   568  C~2b80      
2017 02  24.47162  09 20 41.414  +26 12 09.10        17DM121   568  C~2b80      
2017 04  20.18165  09 17 45.063  +26 15 05.06  23.6R 17DM121   G37  C~2b80      
2017 04  20.25532  09 17 45.011  +26 15 04.36        17DM121   G37  C~2b80      
2018 02  06.29614  09 28 22.975  +25 42 04.44        17DM121   G37  C~2b80      
2018 02  06.30340  09 28 22.923  +25 42 04.62        17DM121   G37  C~2b80      
2018 02  06.31064  09 28 22.879  +25 42 04.66        17DM121   G37  C~2b80      
2018 03  07.16974  09 25 57.612  +25 51 14.66        17DM121   G37  C~2b80      
2018 03  07.17715  09 25 57.572  +25 51 15.04        17DM121   G37  C~2b80      
2018 03  07.29548  09 25 57.038  +25 51 16.39        17DM121   G37  C~2b80      
2020 02  18.168730 09 39 28.297  +24 56 14.10  23.1G 17DM121   G37  C~3k4S      
2020 02  18.219130 09 39 28.013  +24 56 15.34        17DM121   G37  C~3k4S      
2024 01  09.450330 10 06 07.884  +22 46 15.01  23.1G 17DM121   G37  C~7gv3      
2024 01  09.490320 10 06 07.731  +22 46 15.83        17DM121   G37  C~7gv3      
2024 01  09.528440 10 06 07.609  +22 46 17.09        17DM121   G37  C~7gv3      

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     1.13       0.00     0.53
     2   0.0005      0.00     1.34       0.00     0.50
     3   0.1502      0.00    -0.44       0.00     0.47
     4   0.1504      0.00    -0.19       0.00     0.58
     5   0.9500      0.00    -0.47       0.00    -0.13
     6   0.9500      0.00    -0.67       0.00    -0.12
     7   0.9500      0.00    -0.75       0.00    -0.26
     8   1.0291      0.00    -0.31       0.00    -0.64
     9   1.0291      0.00    -0.40       0.00    -0.36
    10   1.0294      0.00    -0.18       0.00    -0.54
    11   2.9811      0.00     0.59       0.00    -0.32
    12   2.9813      0.00     0.28       0.00    -0.22
    13   6.8724      0.00     0.01       0.00     0.35
    14   6.8725      0.00    -0.09       0.00     0.00
    15   6.8726      0.00     0.16       0.00     0.15

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.

17DM121    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.548    44.548    44.548
ecceobj         0.069     0.069     0.069
incobj         10.191    10.191    10.191
qmin           40.585    40.593    40.589
qmax           48.577    48.553    48.595
amean          44.475    44.475    44.475
amin           44.115    44.114    44.118
amax           44.843    44.845    44.842
emean           0.070     0.070     0.070
emin            0.056     0.056     0.056
emax            0.084     0.083     0.084
imean           8.895     8.895     8.895
imin            8.411     8.411     8.411
imax            9.410     9.409     9.408
excite_mean     0.170     0.170     0.170
fracstop        1.000     1.000     1.000
cjmean          3.073     3.073     3.073

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       177.0     177.0     176.9
kozaiamp        179.9     180.0     180.0