Orbit Fit and Astrometric record for 17DQ171

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: 17DQ171   
# Created Tue Apr  1 01:11:06 2025
# Orbit generated from Bernstein formalism
# Fitting     14 observations of     14
# Arc:   2.99y
# First observation: 2016/04/05
#  Last observation: 2019/04/03
Preliminary a, adot, b, bdot, g, gdot:
  -0.000041   0.029548  -0.000022   0.003418   0.026531   0.000000
# Chi-squared of fit:     4.34 DOF:     22 RMS:  0.10
# Min/Max residuals:    -0.18    0.17
# Exact a, adot, b, bdot, g, gdot:
  1.764929E-05  2.952651E-02  1.782365E-06  3.412019E-03  2.699939E-02  8.394878E-04
# Covariance matrix:
  6.1980E-13 -1.7981E-12  8.8198E-14 -1.9388E-13  2.2888E-13 -1.7644E-11
 -1.7981E-12  7.8460E-12 -4.1577E-13  8.9214E-13 -1.5219E-12  8.0874E-11
  8.8198E-14 -4.1577E-13  2.4265E-13 -1.6890E-13  8.8256E-14 -4.3528E-12
 -1.9388E-13  8.9214E-13 -1.6890E-13  2.3155E-13 -1.7594E-13  9.3488E-12
  2.2888E-13 -1.5219E-12  8.8256E-14 -1.7594E-13  5.9533E-13 -1.5754E-11
 -1.7644E-11  8.0874E-11 -4.3528E-12  9.3488E-12 -1.5754E-11  8.4762E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.844397 -174.452401   -0.177345    0.065872   -0.978324  2457483.945084
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:            8.69401 +/-     0.235
Argument of Peri:       17.19860 +/-     0.345
Long of Asc Node:      156.23063 +/-     0.003
Inclination:             7.55143 +/-     0.001
Eccentricity:         0.17651332 +/-    0.0005
Semi-Major Axis:     46.00336150 +/-    0.0213
Time of Perihelion: 2454728.1710 +/-      74.4
Perihelion:          37.88315548 +/-    0.0300
Aphelion:            54.12356752 +/-    0.0350
Period (y)              312.0273 +/-      0.22
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.74394679 +/-    0.0011
Ecliptic Y           -3.84651543 +/-    0.0001
Ecliptic Z            2.48337829 +/-    0.0001
Ecliptic XDOT         0.00022813 +/-    0.0000
Ecliptic YDOT        -0.00299304 +/-    0.0000
Ecliptic ZDOT         0.00035093 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.02063082 +/-    0.0010
Geocenter to KBO     37.03787100 +/-    0.0011
# Hcoef:  9.55

The following table shows the complete astrometric record for 17DQ171. 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 (17DQ171) followed by the observatory code and reference code for the source of the astrometry.

2016 04  05.444295 12 26 27.59   +01 19 34.8         17DQ171   T09  C~89Ua      
2016 04  05.562321 12 26 27.03   +01 19 38.4         17DQ171   T09  C~89Ua      
2016 06  05.320049 12 23 07.54   +01 39 02.9         17DQ171   T09  C~89Ua      
2016 06  05.332736 12 23 07.54   +01 39 03.1         17DQ171   T09  C~89Ua      
2017 01  30.62076  12 37 13.41   +00 17 27.4   24.5z 17DQ171   T09  C~89Ua      
2017 01  30.62613  12 37 13.40   +00 17 27.4   25.5z 17DQ171   T09  C~89Ua      
2017 01  30.65099  12 37 13.36   +00 17 28.1   24.9z 17DQ171   T09  C~89Ua      
2017 02  02.612845 12 37 07.36   +00 18 30.5         17DQ171   T09  C~89Ua      
2017 02  02.658456 12 37 07.25   +00 18 31.4         17DQ171   T09  C~89Ua      
2017 02  23.53862  12 36 04.77   +00 27 40.8   25.6r 17DQ171   T09  C~89Ua      
2017 02  23.57615  12 36 04.62   +00 27 41.8   25.7r 17DQ171   T09  C~89Ua      
2017 02  23.62075  12 36 04.47   +00 27 43.2   25.4r 17DQ171   T09  C~89Ua      
2019 04  03.426507 12 46 13.67   -00 10 17.6         17DQ171   T09  C~89Ua      
2019 04  03.450756 12 46 13.54   -00 10 16.9         17DQ171   T09  C~89Ua      

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    -0.07       0.00     0.04
     2   0.0003     -9.14     0.09      -0.02    -0.02
     3   0.1667  -3217.35    -0.08    -114.78    -0.12
     4   0.1667  -3217.43     0.06    -114.60     0.12
     5   0.8218  10379.00    -0.16     417.80    -0.08
     6   0.8219  10378.86    -0.10     417.74    -0.18
     7   0.8219  10378.03    -0.05     418.15     0.06
     8   0.8300  10270.39     0.17     439.75     0.14
     9   0.8302  10268.52     0.11     439.93     0.01
    10   0.8873   9187.90    -0.05     572.64     0.06
    11   0.8874   9185.44    -0.09     572.67    -0.09
    12   0.8875   9182.81     0.17     573.06     0.08
    13   2.9924  18519.69     0.06    2110.81     0.07
    14   2.9925  18517.60    -0.06    2110.68    -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.

17DQ171    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.460    45.537    45.383
ecceobj         0.167     0.168     0.165
incobj          7.579     7.579     7.578
qmin           37.185    37.223    37.245
qmax           54.597    54.700    54.368
amean          45.687    45.783    45.610
amin           45.297    45.368    45.213
amax           46.151    46.247    46.051
emean           0.168     0.172     0.166
emin            0.153     0.159     0.151
emax            0.184     0.184     0.182
imean           6.792     6.982     6.792
imin            6.078     6.386     6.061
imax            7.662     7.671     7.670
excite_mean     0.205     0.211     0.204
fracstop        1.000     1.000     1.000
cjmean          3.071     3.069     3.071

libcent 0      -180.0    -180.0     177.0
libamp  0      -180.0    -180.0     176.8
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     174.9     178.0
kozaiamp        180.0     179.9     180.0