Orbit Fit and Astrometric record for 17DE168

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: 17DE168   
# Created Tue Apr  1 01:11:05 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     21 observations of     21
# Arc:   8.16y
# First observation: 2011/02/04
#  Last observation: 2019/04/03
# Chi-squared of fit:     6.83 DOF:     36 RMS:  0.10
# Min/Max residuals:    -0.19    0.19
# Exact a, adot, b, bdot, g, gdot:
  1.255279E-05  1.314468E-02 -5.233371E-06 -6.679574E-03  1.744055E-02 -8.301936E-03
# Covariance matrix:
  4.7518E-13 -1.2967E-13 -2.2918E-14  3.2049E-14 -3.8750E-14 -6.3308E-13
 -1.2967E-13  1.1616E-13  3.6370E-14 -5.1706E-14  1.6288E-13  1.0155E-12
 -2.2918E-14  3.6370E-14  4.4948E-13 -8.9161E-14  3.5799E-14  3.7639E-13
  3.2049E-14 -5.1706E-14 -8.9161E-14  4.0069E-14 -5.7083E-14 -5.3003E-13
 -3.8750E-14  1.6288E-13  3.5799E-14 -5.7083E-14  9.0202E-13  1.0789E-12
 -6.3308E-13  1.0155E-12  3.7639E-13 -5.3003E-13  1.0789E-12  1.0444E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    7.316899 -175.514199    0.748695    0.082323   -0.641148  2455596.983847
# Heliocentric elements and errors
Epoch:              2455596.5000  =  2011/02/04
Mean Anomaly:          335.69719 +/-     0.023
Argument of Peri:      251.38960 +/-     0.014
Long of Asc Node:       17.54062 +/-     0.000
Inclination:            28.02435 +/-     0.000
Eccentricity:         0.59778875 +/-    0.0003
Semi-Major Axis:     93.10083581 +/-    0.0568
Time of Perihelion: 2477746.9607 +/-     280.6
Perihelion:          37.44620350 +/-    0.0335
Aphelion:           148.75546813 +/-    0.0940
Period (y)              898.3355 +/-      0.82
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -57.39534325 +/-    0.0031
Ecliptic Y           -3.75334985 +/-    0.0002
Ecliptic Z            7.30204596 +/-    0.0004
Ecliptic XDOT         0.00131582 +/-    0.0000
Ecliptic YDOT        -0.00196042 +/-    0.0000
Ecliptic ZDOT        -0.00120600 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   57.98002930 +/-    0.0031
Geocenter to KBO     57.33808219 +/-    0.0031
# Hcoef:  7.27

The following table shows the complete astrometric record for 17DE168. 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 (17DE168) followed by the observatory code and reference code for the source of the astrometry.

2011 02  04.483081 12 28 05.78   +04 55 58.7         17DE168   T14  C~8ScG      
2011 02  04.531324 12 28 05.70   +04 55 59.5         17DE168   T14  C~8ScG      
2011 02  04.597260 12 28 05.57   +04 56 00.7         17DE168   T14  C~8ScG      
2016 04  01.286317 12 36 29.19   +01 48 31.4         17DE168   T09  C~8ScG      
2016 04  01.305734 12 36 29.12   +01 48 31.7         17DE168   T09  C~8ScG      
2016 04  01.369437 12 36 28.87   +01 48 33.0         17DE168   T09  C~8ScG      
2016 04  01.389474 12 36 28.80   +01 48 33.5         17DE168   T09  C~8ScG      
2017 02  21.50560  12 41 01.96   +00 53 09.0   24.5z 17DE168   T09  C~86uz      
2017 02  21.50898  12 41 01.96   +00 53 09.3   24.2z 17DE168   T09  C~86uz      
2017 02  21.52849  12 41 01.90   +00 53 09.7   24.3z 17DE168   T09  C~86uz      
2017 02  21.54193  12 41 01.86   +00 53 09.8   24.1z 17DE168   T09  C~86uz      
2017 02  21.57429  12 41 01.77   +00 53 10.5   24.5z 17DE168   T09  C~86uz      
2017 02  21.61448  12 41 01.67   +00 53 11.0   24.4z 17DE168   T09  C~86uz      
2017 02  23.55566  12 40 56.21   +00 53 43.8   24.7r 17DE168   T09  C~86uz      
2017 02  23.62285  12 40 56.02   +00 53 44.8   25.1r 17DE168   T09  C~86uz      
2017 02  23.65247  12 40 55.93   +00 53 45.5   25.0r 17DE168   T09  C~86uz      
2017 03  04.552427 12 40 29.00   +00 56 24.2         17DE168   T09  C~8ScG      
2017 03  04.609439 12 40 28.82   +00 56 25.3         17DE168   T09  C~8ScG      
2017 04  02.487843 12 38 47.75   +01 05 33.1         17DE168   T09  C~8ScG      
2019 04  03.450757 12 43 37.30   -00 23 09.0         17DE168   T09  C~8ScG      
2019 04  03.474913 12 43 37.21   -00 23 08.5         17DE168   T09  C~8ScG      

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    -0.19       0.00    -0.10
     2   0.0001      0.00     0.08       0.00    -0.04
     3   0.0003      0.00     0.14       0.00     0.14
     4   5.1548      0.00     0.06       0.00    -0.08
     5   5.1549      0.00     0.07       0.00    -0.14
     6   5.1551      0.00    -0.18       0.00    -0.00
     7   5.1551      0.00    -0.12       0.00     0.13
     8   6.0480      0.00    -0.07       0.00    -0.16
     9   6.0480      0.00     0.07       0.00     0.08
    10   6.0480      0.00    -0.00       0.00     0.16
    11   6.0481      0.00    -0.03       0.00     0.03
    12   6.0482      0.00    -0.01       0.00     0.19
    13   6.0483      0.00     0.19       0.00     0.02
    14   6.0536      0.00    -0.13       0.00    -0.00
    15   6.0538      0.00    -0.05       0.00    -0.15
    16   6.0539      0.00    -0.11       0.00     0.04
    17   6.0782      0.00     0.05       0.00    -0.02
    18   6.0784      0.00     0.13       0.00     0.03
    19   6.1574      0.00     0.04       0.00    -0.06
    20   8.1587      0.00    -0.03       0.00    -0.04
    21   8.1588      0.00    -0.02       0.00     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.

17DE168    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        92.675    92.673    92.676
ecceobj         0.596     0.596     0.596
incobj         28.055    28.055    28.055
qmin           36.621    36.581    36.577
qmax          155.139   154.922   155.000
amean          93.815    93.793    93.816
amin           92.127    92.116    92.116
amax           96.559    96.514    96.406
emean           0.592     0.590     0.591
emin            0.576     0.572     0.575
emax            0.610     0.610     0.610
imean          28.705    28.794    28.722
imin           27.733    27.695    27.720
imax           29.591    29.915    29.646
excite_mean     0.762     0.762     0.762
fracstop        1.000     1.000     1.000
cjmean          2.817     2.817     2.817

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       202.6     184.7     195.4
kozaiamp        180.0     180.0     180.0