Orbit Fit and Astrometric record for 17DE165

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: 17DE165   
# Created Tue Apr  1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:   3.00y
# First observation: 2016/04/02
#  Last observation: 2019/04/03
Preliminary a, adot, b, bdot, g, gdot:
  -0.000006   0.031337   0.000012  -0.002189   0.028046   0.000000
# Chi-squared of fit:     5.15 DOF:     30 RMS:  0.09
# Min/Max residuals:    -0.14    0.29
# Exact a, adot, b, bdot, g, gdot:
  1.701221E-05  3.129266E-02 -1.377979E-06 -2.184890E-03  2.870245E-02  5.510831E-04
# Covariance matrix:
  9.6237E-13 -2.1454E-12 -7.0586E-14  1.4549E-13  5.0984E-14 -1.9388E-11
 -2.1454E-12  7.3576E-12  2.3584E-13 -5.2515E-13 -1.1261E-12  7.0955E-11
 -7.0586E-14  2.3584E-13  2.2743E-13 -1.3804E-13 -2.9600E-14  2.2967E-12
  1.4549E-13 -5.2515E-13 -1.3804E-13  1.4503E-13  8.3252E-14 -5.1418E-12
  5.0984E-14 -1.1261E-12 -2.9600E-14  8.3252E-14  5.6586E-13 -1.1648E-11
 -1.9388E-11  7.0955E-11  2.2967E-12 -5.1418E-12 -1.1648E-11  6.9538E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.423528 -176.489836   -0.161372    0.058803   -0.980706  2457480.950920
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:           12.69178 +/-     0.421
Argument of Peri:      124.86450 +/-     0.513
Long of Asc Node:       43.49005 +/-     0.004
Inclination:             5.20162 +/-     0.000
Eccentricity:         0.09204636 +/-    0.0005
Semi-Major Axis:     39.33924366 +/-    0.0127
Time of Perihelion: 2454303.2058 +/-     105.3
Perihelion:          35.71820961 +/-    0.0217
Aphelion:            42.96027771 +/-    0.0230
Period (y)              246.7443 +/-      0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.68729674 +/-    0.0009
Ecliptic Y           -2.35316706 +/-    0.0001
Ecliptic Z            2.08051061 +/-    0.0001
Ecliptic XDOT         0.00011806 +/-    0.0000
Ecliptic YDOT        -0.00299028 +/-    0.0000
Ecliptic ZDOT        -0.00020489 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.82525741 +/-    0.0009
Geocenter to KBO     34.84023730 +/-    0.0009
# Hcoef:  9.06

The following table shows the complete astrometric record for 17DE165. 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 (17DE165) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.450131 12 18 19.38   +01 44 47.5         17DE165   T09  C~86uy      
2016 06  04.285017 12 14 36.39   +02 03 26.2         17DE165   T09  C~86uy      
2017 01  23.62773  12 29 23.53   +00 23 10.8   24.3i 17DE165   T09  C~81Bx      
2017 01  23.63574  12 29 23.51   +00 23 11.0   24.3i 17DE165   T09  C~81Bx      
2017 01  23.64112  12 29 23.50   +00 23 11.2   24.6i 17DE165   T09  C~81Bx      
2017 01  23.64921  12 29 23.49   +00 23 11.3   25.0i 17DE165   T09  C~81Bx      
2017 01  23.65460  12 29 23.50   +00 23 11.2   24.5i 17DE165   T09  C~81Bx      
2017 01  28.59538  12 29 14.23   +00 24 31.5   24.0z 17DE165   T09  C~81Bx      
2017 01  28.60612  12 29 14.20   +00 24 31.8   24.1z 17DE165   T09  C~81Bx      
2017 01  28.63916  12 29 14.12   +00 24 32.3   24.1z 17DE165   T09  C~81Bx      
2017 02  23.55008  12 27 50.46   +00 34 53.0   24.8r 17DE165   T09  C~81Bx      
2017 02  23.61656  12 27 50.17   +00 34 54.8   24.7r 17DE165   T09  C~81Bx      
2017 02  23.64828  12 27 50.04   +00 34 55.8   25.0r 17DE165   T09  C~81Bx      
2017 03  04.601331 12 27 10.22   +00 39 26.9         17DE165   T09  C~86uy      
2017 03  04.639242 12 27 10.04   +00 39 28.1         17DE165   T09  C~86uy      
2019 04  03.439950 12 37 26.76   -00 44 03.7         17DE165   T09  C~86uy      
2019 04  03.448087 12 37 26.72   -00 44 03.3         17DE165   T09  C~86uy      
2019 04  03.472242 12 37 26.59   -00 44 02.6         17DE165   T09  C~86uy      

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     0.04
     2   0.1720  -3512.74    -0.05    -300.34    -0.10
     3   0.8109  11096.86     0.06    -531.91    -0.11
     4   0.8109  11096.50    -0.05    -531.85    -0.08
     5   0.8109  11096.29    -0.11    -531.73     0.03
     6   0.8109  11096.11    -0.05    -531.69     0.04
     7   0.8110  11096.29     0.29    -531.73    -0.01
     8   0.8245  10936.31     0.05    -513.37    -0.05
     9   0.8245  10935.78    -0.08    -513.27     0.02
    10   0.8246  10934.47    -0.14    -513.29    -0.10
    11   0.8956   9532.79    -0.11    -443.16     0.16
    12   0.8957   9528.08    -0.12    -443.24     0.01
    13   0.8958   9525.89    -0.08    -443.10     0.11
    14   0.9203   8868.76     0.17    -432.05     0.04
    15   0.9204   8865.80     0.16    -432.02     0.05
    16   3.0007  19398.53     0.01   -1351.86    -0.09
    17   3.0007  19397.81    -0.00   -1351.73     0.06
    18   3.0007  19395.73    -0.01   -1351.87    -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.

17DE165    quality flag:2

Type:      CLASSICAL  SCATNEAR CLASSICAL

axisobj        38.960    39.008    38.912
ecceobj         0.083     0.085     0.081
incobj          5.214     5.214     5.214
qmin           34.718    34.338    34.713
qmax           43.899    44.464    43.681
amean          39.092    39.148    39.041
amin           38.753    38.789    38.716
amax           39.486    39.608    39.417
emean           0.086     0.088     0.084
emin            0.062     0.057     0.062
emax            0.112     0.124     0.109
imean           6.491     6.343     6.532
imin            4.631     4.497     4.621
imax            8.163     8.011     8.284
excite_mean     0.143     0.142     0.142
fracstop        1.000     1.000     1.000
cjmean          3.026     3.027     3.026

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       179.7     180.0     180.3
kozaiamp        179.9     179.9     180.0