Orbit Fit and Astrometric record for 17DK171

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: 17DK171   
# Created Wed Dec 25 02:10:54 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     22 observations of     22
# Arc:  15.04y
# First observation: 2004/03/20
#  Last observation: 2019/04/06
# Chi-squared of fit:    11.39 DOF:     38 RMS:  0.13
# Min/Max residuals:    -0.31    0.25
# Exact a, adot, b, bdot, g, gdot:
  1.416175E-05  2.214913E-02  3.162930E-07  3.474254E-04  2.341337E-02  1.304071E-04
# Covariance matrix:
  7.3419E-13 -1.0620E-13  6.9834E-16 -8.6153E-16 -4.7337E-14 -1.6733E-13
 -1.0620E-13  7.7358E-14 -9.6776E-16  1.1470E-15  2.1282E-14  2.2631E-13
  6.9834E-16 -9.6776E-16  6.9174E-13 -5.2102E-14 -3.6035E-17 -3.0007E-15
 -8.6153E-16  1.1470E-15 -5.2102E-14  4.3274E-15  4.9188E-16  3.5519E-15
 -4.7337E-14  2.1282E-14 -3.6035E-17  4.9188E-16  4.2472E-13  6.1745E-14
 -1.6733E-13  2.2631E-13 -3.0007E-15  3.5519E-15  6.1745E-14  7.0119E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.316589  174.947064   -0.092357    0.074421   -0.985266  2453084.988189
# Heliocentric elements and errors
Epoch:              2453084.5000  =  2004/03/20
Mean Anomaly:          111.42089 +/-     0.489
Argument of Peri:      325.70008 +/-     0.477
Long of Asc Node:       96.94496 +/-     0.002
Inclination:             4.31070 +/-     0.000
Eccentricity:         0.00971508 +/-    0.0000
Semi-Major Axis:     43.54192318 +/-    0.0048
Time of Perihelion: 2420603.9071 +/-     142.5
Perihelion:          43.11890989 +/-    0.0051
Aphelion:            43.96493648 +/-    0.0051
Period (y)              287.3225 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -43.42011226 +/-    0.0012
Ecliptic Y            3.74785776 +/-    0.0001
Ecliptic Z            3.21475412 +/-    0.0001
Ecliptic XDOT        -0.00024365 +/-    0.0000
Ecliptic YDOT        -0.00258568 +/-    0.0000
Ecliptic ZDOT         0.00004180 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.69996255 +/-    0.0012
Geocenter to KBO     42.71066697 +/-    0.0012
# Hcoef:  7.73

The following table shows the complete astrometric record for 17DK171. 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 (17DK171) followed by the observatory code and reference code for the source of the astrometry.

2004 03  20.487446 11 48 19.56   +05 58 08.7         17DK171   T14  C~89Ua      
2004 03  20.503150 11 48 19.47   +05 58 09.3         17DK171   T14  C~89Ua      
2016 04  04.445379 12 43 20.15   +00 07 41.1         17DK171   T09  C~89Ua      
2016 04  04.48277  12 43 19.98   +00 07 42.1   25.4g 17DK171   T09  C~8COu      
2016 04  04.51733  12 43 19.84   +00 07 43.0   25.2g 17DK171   T09  C~8COu      
2016 04  04.560026 12 43 19.65   +00 07 44.2         17DK171   T09  C~89Ua      
2017 02  21.50220  12 50 45.20   -00 41 21.2   23.5z 17DK171   T09  C~89Ua      
2017 02  21.51771  12 50 45.15   -00 41 20.7   23.0z 17DK171   T09  C~89Ua      
2017 02  21.53924  12 50 45.09   -00 41 20.2   23.5z 17DK171   T09  C~89Ua      
2017 02  21.60910  12 50 44.87   -00 41 18.4   23.9z 17DK171   T09  C~89Ua      
2017 02  21.61177  12 50 44.86   -00 41 18.4   24.1z 17DK171   T09  C~89Ua      
2017 02  23.54701  12 50 38.80   -00 40 31.9   24.1r 17DK171   T09  C~89Ua      
2017 02  23.57183  12 50 38.70   -00 40 31.5   24.3r 17DK171   T09  C~89Ua      
2017 02  23.61428  12 50 38.59   -00 40 30.2   24.3r 17DK171   T09  C~89Ua      
2017 02  23.64401  12 50 38.48   -00 40 29.5   23.9r 17DK171   T09  C~89Ua      
2017 02  23.64611  12 50 38.49   -00 40 29.3   24.0r 17DK171   T09  C~89Ua      
2017 04  27.384634 12 46 25.43   -00 13 03.1         17DK171   T09  C~89Ua      
2017 04  27.429017 12 46 25.25   -00 13 02.1         17DK171   T09  C~89Ua      
2019 04  06.350099 12 57 13.73   -01 21 56.5         17DK171   T09  C~89Ua      
2019 04  06.35349  12 57 13.71   -01 21 56.3   24.0i 17DK171   T09  C~8COu      
2019 04  06.50438  12 57 13.03   -01 21 52.1   23.8i 17DK171   T09  C~8COu      
2019 04  06.515104 12 57 13.01   -01 21 52.0         17DK171   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     0.14       0.00    -0.08
     2   0.0000      0.00    -0.16       0.00     0.08
     3  12.0410      0.00    -0.09       0.00    -0.10
     4  12.0411      0.00    -0.17       0.00    -0.11
     5  12.0411      0.00     0.01       0.00    -0.15
     6  12.0413      0.00    -0.03       0.00    -0.10
     7  12.9254      0.00     0.03       0.00    -0.05
     8  12.9255      0.00     0.02       0.00     0.09
     9  12.9255      0.00     0.13       0.00     0.07
    10  12.9257      0.00     0.13       0.00     0.21
    11  12.9257      0.00     0.11       0.00     0.15
    12  12.9310      0.00    -0.02       0.00     0.07
    13  12.9311      0.00    -0.31       0.00    -0.14
    14  12.9312      0.00     0.12       0.00     0.13
    15  12.9313      0.00    -0.07       0.00     0.10
    16  12.9313      0.00     0.18       0.00     0.25
    17  13.1031      0.00     0.01       0.00    -0.10
    18  13.1032      0.00    -0.06       0.00    -0.06
    19  15.0441      0.00     0.03       0.00    -0.15
    20  15.0441      0.00    -0.05       0.00    -0.04
    21  15.0445      0.00    -0.26       0.00     0.09
    22  15.0446      0.00     0.15       0.00    -0.10

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.

17DK171    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.082    43.082    43.082
ecceobj         0.018     0.018     0.018
incobj          4.311     4.311     4.311
qmin           41.342    41.328    41.358
qmax           45.414    45.431    45.418
amean          43.304    43.303    43.303
amin           42.972    42.975    42.968
amax           43.642    43.643    43.642
emean           0.025     0.025     0.025
emin            0.005     0.005     0.005
emax            0.041     0.041     0.041
imean           2.663     2.663     2.663
imin            1.782     1.782     1.782
imax            3.447     3.447     3.447
excite_mean     0.053     0.053     0.053
fracstop        1.000     1.000     1.000
cjmean          3.090     3.090     3.090

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       171.9     171.9     171.8
kozaiamp        179.9     179.9     179.9