Orbit Fit and Astrometric record for 17DV165

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: 17DV165   
# Created Tue Apr  1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting     14 observations of     14
# Arc:   3.00y
# First observation: 2016/04/04
#  Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.000082   0.022110   0.000006  -0.001413   0.023322   0.000000
# Chi-squared of fit:    17.25 DOF:     22 RMS:  0.20
# Min/Max residuals:    -0.45    0.44
# Exact a, adot, b, bdot, g, gdot:
  1.437549E-05  2.203709E-02 -1.329950E-06 -1.408639E-03  2.348100E-02 -6.286460E-04
# Covariance matrix:
  7.3160E-13 -9.6109E-13 -2.4628E-14  4.6863E-14 -3.2570E-13 -1.0828E-11
 -9.6109E-13  2.0107E-12  5.4548E-14 -1.1520E-13  1.5106E-13  2.6717E-11
 -2.4628E-14  5.4548E-14  3.1791E-13 -2.2855E-13  9.3409E-15  8.1817E-13
  4.6863E-14 -1.1520E-13 -2.2855E-13  2.4772E-13 -7.3467E-15 -1.7411E-12
 -3.2570E-13  1.5106E-13  9.3409E-15 -7.3467E-15  6.4480E-13  1.6071E-12
 -1.0828E-11  2.6717E-11  8.1817E-13 -1.7411E-12  1.6071E-12  4.0389E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.810802 -170.832316   -0.099187    0.066005   -0.989040  2457483.015990
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          236.84948 +/-     0.823
Argument of Peri:      260.50423 +/-     0.825
Long of Asc Node:       54.73837 +/-     0.010
Inclination:             5.21940 +/-     0.001
Eccentricity:         0.03108105 +/-    0.0008
Semi-Major Axis:     42.82492335 +/-    0.0061
Time of Perihelion: 2492497.3488 +/-     234.0
Perihelion:          41.49387957 +/-    0.0340
Aphelion:            44.15596713 +/-    0.0341
Period (y)              280.2548 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -42.91711863 +/-    0.0014
Ecliptic Y           -7.02876029 +/-    0.0003
Ecliptic Z            2.83044043 +/-    0.0001
Ecliptic XDOT         0.00047094 +/-    0.0000
Ecliptic YDOT        -0.00253374 +/-    0.0000
Ecliptic ZDOT        -0.00016875 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.58088957 +/-    0.0014
Geocenter to KBO     42.58763008 +/-    0.0015
# Hcoef:  8.48

The following table shows the complete astrometric record for 17DV165. 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 (17DV165) followed by the observatory code and reference code for the source of the astrometry.

2016 04  04.515201 12 39 41.06   -00 07 45.7         17DV165   T09  C~83F3      
2016 04  04.557901 12 39 40.85   -00 07 44.8         17DV165   T09  C~83F3      
2017 02  21.49208  12 47 01.91   -01 00 35.5   23.8z 17DV165   T09  C~83F3      
2017 02  21.51504  12 47 01.82   -01 00 34.5   24.5z 17DV165   T09  C~83F3      
2017 02  21.53924  12 47 01.79   -01 00 34.5   24.3z 17DV165   T09  C~83F3      
2017 02  21.56076  12 47 01.69   -01 00 33.8   24.8z 17DV165   T09  C~83F3      
2017 02  21.58766  12 47 01.60   -01 00 33.3   24.6z 17DV165   T09  C~83F3      
2017 02  21.60910  12 47 01.55   -01 00 32.7   24.1z 17DV165   T09  C~83F3      
2017 02  23.53285  12 46 55.33   -00 59 48.2   25.4r 17DV165   T09  C~83F3      
2017 02  23.56973  12 46 55.23   -00 59 47.5   25.5r 17DV165   T09  C~83F3      
2017 02  23.60376  12 46 55.08   -00 59 46.0   25.7r 17DV165   T09  C~83F3      
2017 04  27.380876 12 42 38.55   -00 32 54.3         17DV165   T09  C~83F3      
2017 04  27.408451 12 42 38.44   -00 32 53.7         17DV165   T09  C~83F3      
2019 04  06.501697 12 53 12.72   -01 50 08.1         17DV165   T09  C~83F3      

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     0.10       0.00     0.08
     2   0.0001     -3.25    -0.11      -0.41    -0.26
     3   0.8843   7328.99    -0.05    -319.51    -0.06
     4   0.8843   7327.36    -0.45    -319.12     0.28
     5   0.8844   7326.94     0.44    -319.30     0.06
     6   0.8845   7325.29    -0.06    -319.24     0.07
     7   0.8845   7323.85    -0.05    -319.31    -0.05
     8   0.8846   7322.92     0.18    -319.05     0.16
     9   0.8898   7219.53    -0.02    -314.72    -0.17
    10   0.8900   7217.87     0.38    -314.67    -0.19
    11   0.8900   7215.21    -0.38    -314.17     0.25
    12   1.0619   3041.07     0.01    -342.05    -0.04
    13   1.0620   3039.31    -0.01    -342.15    -0.04
    14   3.0034  13626.45    -0.00    -874.97    -0.07

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.

17DV165    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        42.388    42.408    42.368
ecceobj         0.038     0.037     0.039
incobj          5.232     5.232     5.232
qmin           40.172    40.246    40.055
qmax           45.243    45.202    45.344
amean          42.607    42.627    42.587
amin           42.280    42.303    42.255
amax           42.942    42.962    42.934
emean           0.036     0.034     0.037
emin            0.012     0.011     0.012
emax            0.054     0.053     0.057
imean           3.268     3.283     3.254
imin            2.179     2.219     2.145
imax            4.466     4.466     4.466
excite_mean     0.068     0.068     0.069
fracstop        1.000     1.000     1.000
cjmean          3.080     3.080     3.079

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       179.0     179.2     178.7
kozaiamp        180.0     180.0     179.9