Orbit Fit and Astrometric record for 17DM162

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: 17DM162   
# Created Tue Apr  1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting     26 observations of     26
# Arc:   0.90y
# First observation: 2016/04/02
#  Last observation: 2017/02/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000036   0.018205   0.000000  -0.002670   0.020823   0.000000
# Chi-squared of fit:    13.51 DOF:     46 RMS:  0.13
# Min/Max residuals:    -0.33    0.37
# Exact a, adot, b, bdot, g, gdot:
  1.350033E-05  1.811960E-02 -2.275349E-06 -2.687124E-03  2.120019E-02  1.503146E-03
# Covariance matrix:
  2.1824E-13  1.9433E-12  1.0640E-14 -2.4948E-13  1.0392E-12  9.7949E-11
  1.9433E-12  1.5025E-10  6.4257E-13 -1.6419E-11  5.8740E-11  6.3987E-09
  1.0640E-14  6.4257E-13  1.6299E-13 -2.6311E-13  2.6270E-13  2.7796E-11
 -2.4948E-13 -1.6419E-11 -2.6311E-13  2.1650E-12 -6.5486E-12 -7.0476E-10
  1.0392E-12  5.8740E-11  2.6270E-13 -6.5486E-12  2.4501E-11  2.5573E-09
  9.7949E-11  6.3987E-09  2.7796E-11 -7.0476E-10  2.5573E-09  2.7483E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.079530 -174.410421   -0.125095    0.053200   -0.986300  2457480.920788
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          127.85477 +/-    10.021
Argument of Peri:       22.85364 +/-     9.749
Long of Asc Node:       25.31792 +/-     0.007
Inclination:             8.93648 +/-     0.003
Eccentricity:         0.11468339 +/-    0.0174
Semi-Major Axis:     44.68540368 +/-    0.1927
Time of Perihelion: 2418731.4207 +/-    3026.6
Perihelion:          39.56072989 +/-    0.7948
Aphelion:            49.81007746 +/-    0.8055
Period (y)              298.7148 +/-      1.93
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -47.85188491 +/-    0.0109
Ecliptic Y           -4.81114079 +/-    0.0011
Ecliptic Z            2.53395603 +/-    0.0006
Ecliptic XDOT         0.00001656 +/-    0.0001
Ecliptic YDOT        -0.00235657 +/-    0.0000
Ecliptic ZDOT        -0.00033609 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   48.15984737 +/-    0.0109
Geocenter to KBO     47.16939458 +/-    0.0110
# Hcoef:  8.99

The following table shows the complete astrometric record for 17DM162. 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 (17DM162) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.419999 12 25 24.13   +00 36 26.6         17DM162   T09  C~81Bu      
2016 04  02.525980 12 25 23.70   +00 36 29.1         17DM162   T09  C~81Bu      
2016 04  04.35736  12 25 16.41   +00 37 12.2   26.6g 17DM162   T09  C~8COu      
2016 04  04.37012  12 25 16.32   +00 37 12.6   26.6g 17DM162   T09  C~8COu      
2016 04  04.41508  12 25 16.16   +00 37 13.6   26.5g 17DM162   T09  C~8COu      
2016 04  04.52167  12 25 15.73   +00 37 16.3   26.0g 17DM162   T09  C~8COu      
2016 04  05.438298 12 25 12.09   +00 37 37.6         17DM162   T09  C~81Bu      
2016 04  05.556253 12 25 11.61   +00 37 40.4         17DM162   T09  C~81Bu      
2016 06  05.320049 12 22 20.17   +00 51 51.8         17DM162   T09  C~81Bu      
2016 06  05.358251 12 22 20.14   +00 51 51.9         17DM162   T09  C~81Bu      
2017 01  23.624307 12 32 36.22   -00 20 25.2         17DM162   T09  C~81Bu      
2017 01  23.630400 12 32 36.21   -00 20 25.1         17DM162   T09  C~81Bu      
2017 01  23.651896 12 32 36.18   -00 20 24.9         17DM162   T09  C~81Bu      
2017 01  28.600753 12 32 28.69   -00 19 26.9         17DM162   T09  C~81Bu      
2017 01  28.622268 12 32 28.65   -00 19 26.6         17DM162   T09  C~81Bu      
2017 02  01.646197 12 32 21.28   -00 18 31.4         17DM162   T09  C~81Bu      
2017 02  01.657063 12 32 21.26   -00 18 31.3         17DM162   T09  C~81Bu      
2017 02  01.662482 12 32 21.25   -00 18 31.3         17DM162   T09  C~81Bu      
2017 02  02.627627 12 32 19.31   -00 18 17.0         17DM162   T09  C~81Bu      
2017 02  02.647237 12 32 19.26   -00 18 16.8         17DM162   T09  C~81Bu      
2017 02  23.53583  12 31 23.34   -00 11 50.7   25.7r 17DM162   T09  C~7zpm      
2017 02  23.56346  12 31 23.24   -00 11 50.4   25.3r 17DM162   T09  C~7zpm      
2017 02  23.57406  12 31 23.24   -00 11 50.1   25.2r 17DM162   T09  C~7zpm      
2017 02  23.60592  12 31 23.09   -00 11 49.2   25.6r 17DM162   T09  C~7zpm      
2017 02  23.60801  12 31 23.10   -00 11 49.1   26.0r 17DM162   T09  C~7zpm      
2017 02  23.63774  12 31 23.02   -00 11 48.6   25.8r 17DM162   T09  C~7zpm      

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     0.00       0.00     0.06
     2   0.0003     -6.91     0.03      -0.26     0.05
     3   0.0053   -124.39     0.26      -3.97     0.00
     4   0.0053   -125.78    -0.30      -4.14    -0.13
     5   0.0055   -128.38     0.03      -4.17    -0.05
     6   0.0058   -135.37    -0.03      -4.24     0.14
     7   0.0083   -193.94     0.03      -6.30     0.02
     8   0.0086   -201.66    -0.05      -6.58     0.04
     9   0.1749  -2900.22    -0.07    -242.56    -0.14
    10   0.1751  -2900.68     0.09    -242.64    -0.01
    11   0.8110   7305.55    -0.00    -566.69     0.09
    12   0.8110   7305.37    -0.04    -566.66     0.11
    13   0.8110   7304.88    -0.02    -566.66     0.09
    14   0.8246   7178.59    -0.08    -557.87    -0.20
    15   0.8246   7177.92    -0.12    -557.84    -0.19
    16   0.8357   7054.40     0.05    -550.91     0.04
    17   0.8357   7054.09     0.11    -550.94    -0.00
    18   0.8357   7053.95     0.15    -551.00    -0.07
    19   0.8384   7021.53     0.05    -549.39     0.01
    20   0.8384   7020.76    -0.03    -549.50    -0.12
    21   0.8956   6096.71    -0.09    -527.06     0.11
    22   0.8957   6095.21    -0.09    -527.38    -0.21
    23   0.8957   6095.09     0.37    -527.11     0.07
    24   0.8958   6092.66    -0.33    -527.17     0.00
    25   0.8958   6092.76    -0.12    -527.02     0.15
    26   0.8959   6091.46     0.19    -527.04     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.

17DM162    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.276    45.096    43.917
ecceobj         0.123     0.174     0.100
incobj          8.984     8.975     8.992
qmin           38.047    36.512    38.974
qmax           51.167    54.518    49.540
amean          44.463    45.317    44.116
amin           44.095    44.905    43.768
amax           44.869    45.782    44.496
emean           0.125     0.175     0.097
emin            0.109     0.159     0.082
emax            0.142     0.192     0.114
imean           8.261     8.162     8.236
imin            7.467     7.244     7.558
imax            8.918     8.947     8.932
excite_mean     0.191     0.226     0.173
fracstop        1.000     1.000     1.000
cjmean          3.063     3.055     3.066

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       176.0     179.8     176.5
kozaiamp        180.0     180.0     179.9