Orbit Fit and Astrometric record for 17DA165

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: 17DA165   
# Created Tue Apr  1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting     19 observations of     20
# Arc:   3.00y
# First observation: 2016/04/04
#  Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.000049   0.022455  -0.000001  -0.000213   0.023322   0.000000
# Chi-squared of fit:    13.01 DOF:     32 RMS:  0.15
# Min/Max residuals:    -0.42    0.34
# Exact a, adot, b, bdot, g, gdot:
  1.496058E-05  2.245645E-02 -3.467253E-07 -2.147831E-04  2.347553E-02  6.791622E-04
# Covariance matrix:
  7.3295E-13 -9.6452E-13 -5.5607E-15  8.1351E-15 -3.2234E-13 -1.0688E-11
 -9.6452E-13  1.9578E-12  4.4854E-15 -1.6713E-14  9.4689E-14  2.4659E-11
 -5.5607E-15  4.4854E-15  2.1920E-13 -1.2299E-13  7.7261E-15  4.5701E-14
  8.1351E-15 -1.6713E-14 -1.2299E-13  1.0710E-13 -1.9957E-15 -2.2052E-13
 -3.2234E-13  9.4689E-14  7.7261E-15 -1.9957E-15  5.9944E-13  1.4665E-13
 -1.0688E-11  2.4659E-11  4.5701E-14 -2.2052E-13  1.4665E-13  3.3061E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.594343 -171.544080   -0.110894    0.079427   -0.986801  2457482.981437
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:           61.23717 +/-     0.318
Argument of Peri:       31.99676 +/-     0.395
Long of Asc Node:       91.53199 +/-     0.011
Inclination:             4.52398 +/-     0.000
Eccentricity:         0.03709668 +/-    0.0008
Semi-Major Axis:     44.33159405 +/-    0.0096
Time of Perihelion: 2439141.2706 +/-      95.1
Perihelion:          42.68703902 +/-    0.0364
Aphelion:            45.97614908 +/-    0.0366
Period (y)              295.1741 +/-      0.10
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -42.96570285 +/-    0.0014
Ecliptic Y           -6.50173490 +/-    0.0002
Ecliptic Z            3.41210571 +/-    0.0001
Ecliptic XDOT         0.00030517 +/-    0.0000
Ecliptic YDOT        -0.00260942 +/-    0.0000
Ecliptic ZDOT        -0.00001862 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.58860681 +/-    0.0014
Geocenter to KBO     42.59755462 +/-    0.0014
# Hcoef:  7.57

The following table shows the complete astrometric record for 17DA165. 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 (17DA165) followed by the observatory code and reference code for the source of the astrometry.

2016 04  04.480648 12 38 18.33   +00 52 12.5         17DA165   T09  C~85Iz      
2016 04  04.493549 12 38 18.27   +00 52 12.9         17DA165   T09  C~85Iz      
2017 02  21.49884  12 45 49.09   +00 01 54.9   23.5z 17DA165   T09  C~81Bx      
2017 02  21.52305  12 45 49.03   +00 01 55.9   24.0z 17DA165   T09  C~81Bx      
2017 02  21.54460  12 45 48.94   +00 01 55.9   23.6z 17DA165   T09  C~81Bx      
2017 02  21.56614  12 45 48.89   +00 01 56.6   23.5z 17DA165   T09  C~81Bx      
2017 02  21.59841  12 45 48.76   +00 01 57.3   23.6z 17DA165   T09  C~81Bx      
2017 02  21.61716  12 45 48.71   +00 01 58.0   23.7z 17DA165   T09  C~81Bx      
2017 02  23.54421  12 45 42.54   +00 02 45.8   24.0r 17DA165   T09  C~81Bx      
2017 02  23.58033  12 45 42.42   +00 02 46.7   24.1r 17DA165   T09  C~81Bx      
2017 02  23.61219  12 45 42.31   +00 02 47.3   24.2r 17DA165   T09  C~81Bx      
2017 02  23.65456  12 45 42.17   +00 02 48.3   24.1r 17DA165   T09  C~81Bx      
2017 03  04.55518  12 45 11.00   +00 06 40.0   23.7y 17DA165   T09  C~81Bx      
2017 03  04.59585  12 45 10.84   +00 06 41.0   23.9y 17DA165   T09  C~81Bx      
2017 03  04.65010  12 45 10.64   +00 06 42.2   23.7y 17DA165   T09  C~81Bx      
2017 04  27.380876 12 41 27.97   +00 30 17.5         17DA165   T09  C~85Iz      
2017 04  27.417363 12 41 27.82   +00 30 18.3         17DA165   T09  C~85Iz      
2019 04  03.477581 12 52 34.29   -00 41 46.8         17DA165   T09  C~85Iz      
2019 04  06.449359 12 52 21.40   -00 40 26.4         17DA165   T09  C~85Iz      
2019 04  06.460461 12 52 21.35   -00 40 26.1         17DA165   T09  C~85Iz      

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     0.03       0.00     0.04
     2   0.0000     -0.98    -0.03       0.01     0.07
     3   0.8844   7406.30    -0.01    -112.46    -0.30
     4   0.8844   7405.08     0.08    -111.89     0.18
     5   0.8845   7403.83     0.00    -112.43    -0.42
     6   0.8846   7402.87     0.20    -112.08    -0.14
     7   0.8846   7400.80    -0.12    -112.20    -0.38
     8   0.8847   7399.83    -0.07    -111.85    -0.09
     9   0.8900   7295.80    -0.04    -104.35     0.19
    10   0.8901   7293.79    -0.02    -104.23     0.20
    11   0.8902   7292.04     0.01    -104.33    -0.00
    12   0.8903   7289.71     0.05    -104.24    -0.05
    13   0.9146   6768.09 (  -0.10)    -75.32 (   0.46)
    14   0.9148   6765.49    -0.14     -75.35     0.34
    15   0.9149   6762.26     0.03     -75.43     0.13
    16   1.0620   3132.62     0.07     -89.37     0.11
    17   1.0621   3130.24    -0.05     -89.52     0.09
    18   2.9952  14043.93    -0.01    -129.78     0.04
    19   3.0033  13833.60     0.01    -131.96    -0.01
    20   3.0034  13832.78    -0.00    -131.98    -0.01

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.

17DA165    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.866    43.897    43.835
ecceobj         0.035     0.036     0.033
incobj          4.523     4.523     4.523
qmin           41.444    41.359    41.481
qmax           46.936    47.046    46.809
amean          44.085    44.117    44.055
amin           43.753    43.777    43.714
amax           44.442    44.484    44.409
emean           0.041     0.043     0.039
emin            0.025     0.027     0.023
emax            0.056     0.058     0.054
imean           2.845     2.845     2.843
imin            2.185     2.192     2.181
imax            3.476     3.476     3.475
excite_mean     0.065     0.066     0.063
fracstop        1.000     1.000     1.000
cjmean          3.098     3.098     3.097

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       175.6     176.5     175.6
kozaiamp        180.0     180.0     179.9