Orbit Fit and Astrometric record for 17DL160

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: 17DL160   
# Created Tue Apr  1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting     17 observations of     18
# Arc:   3.00y
# First observation: 2016/04/04
#  Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.000071   0.024273   0.000003  -0.001082   0.024235   0.000000
# Chi-squared of fit:     7.21 DOF:     28 RMS:  0.12
# Min/Max residuals:    -0.36    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.491398E-05  2.410403E-02 -2.989483E-07 -1.076487E-03  2.446678E-02 -1.770906E-03
# Covariance matrix:
  2.4334E-13 -3.2299E-13 -3.5490E-15  1.0943E-14 -9.8491E-14 -3.3257E-12
 -3.2299E-13  1.1670E-12  1.1780E-14 -4.8957E-14 -1.2943E-13  1.4955E-11
 -3.5490E-15  1.1780E-14  1.6271E-13 -7.8766E-14  3.0518E-15  1.6063E-13
  1.0943E-14 -4.8957E-14 -7.8766E-14  8.2538E-14  6.2471E-15 -6.7390E-13
 -9.8491E-14 -1.2943E-13  3.0518E-15  6.2471E-15  6.5029E-13 -1.9934E-12
 -3.3257E-12  1.4955E-11  1.6063E-13 -6.7390E-13 -1.9934E-12  2.0588E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    5.010402 -170.330551   -0.089592    0.086780   -0.988341  2457482.963558
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          304.93213 +/-     0.194
Argument of Peri:      180.87229 +/-     0.265
Long of Asc Node:       72.01976 +/-     0.006
Inclination:             5.52460 +/-     0.000
Eccentricity:         0.08193432 +/-    0.0005
Semi-Major Axis:     43.70394730 +/-    0.0061
Time of Perihelion: 2473623.1641 +/-      56.7
Perihelion:          40.12309429 +/-    0.0226
Aphelion:            47.28480030 +/-    0.0229
Period (y)              288.9277 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -41.10379995 +/-    0.0013
Ecliptic Y           -7.09636527 +/-    0.0002
Ecliptic Z            3.56962007 +/-    0.0001
Ecliptic XDOT         0.00063740 +/-    0.0000
Ecliptic YDOT        -0.00263453 +/-    0.0000
Ecliptic ZDOT        -0.00013730 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.86433993 +/-    0.0013
Geocenter to KBO     40.87174759 +/-    0.0013
# Hcoef:  8.90

The following table shows the complete astrometric record for 17DL160. 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 (17DL160) followed by the observatory code and reference code for the source of the astrometry.

2016 04  04.462769 12 43 24.48   +00 46 39.7         17DL160   T09  C~81Bu      
2016 04  04.482759 12 43 24.39   +00 46 40.5         17DL160   T09  C~81Bu      
2016 04  04.528005 12 43 24.17   +00 46 41.5         17DL160   T09  C~81Bu      
2016 04  05.462299 12 43 19.97   +00 47 07.2         17DL160   T09  C~81Bu      
2016 04  05.521210 12 43 19.70   +00 47 08.9         17DL160   T09  C~81Bu      
2016 04  05.580226 12 43 19.43   +00 47 10.4         17DL160   T09  C~81Bu      
2017 02  21.50220  12 51 17.36   -00 08 55.2   24.6z 17DL160   T09  C~7xU0      
2017 02  21.56882  12 51 17.14   -00 08 53.5   24.4z 17DL160   T09  C~7xU0      
2017 02  21.61983  12 51 16.95   -00 08 52.2   24.6z 17DL160   T09  C~7xU0      
2017 02  23.54701  12 51 10.71   -00 08 04.1   25.6r 17DL160   T09  C~7xU0      
2017 02  23.58243  12 51 10.58   -00 08 03.3   25.0r 17DL160   T09  C~7xU0      
2017 02  23.61428  12 51 10.49   -00 08 02.1   25.3r 17DL160   T09  C~7xU0      
2017 02  23.64611  12 51 10.34   -00 08 01.6   25.6r 17DL160   T09  C~7xU0      
2017 04  27.384634 12 46 46.48   +00 20 02.6         17DL160   T09  C~81Bu      
2017 04  27.411358 12 46 46.37   +00 20 03.2         17DL160   T09  C~81Bu      
2019 04  06.353478 12 58 23.44   -01 01 17.1         17DL160   T09  C~81Bu      
2019 04  06.463135 12 58 22.94   -01 01 14.2         17DL160   T09  C~81Bu      
2019 04  06.517777 12 58 22.68   -01 01 12.7         17DL160   T09  C~81Bu      

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   0.0001     -1.56     0.06       0.21     0.16
     3   0.0002     -4.98    -0.02      -0.17    -0.14
     4   0.0027    -73.01    -0.04      -1.23    -0.07
     5   0.0029    -77.40    -0.09      -1.25     0.01
     6   0.0031    -81.72    -0.06      -1.46    -0.10
     7   0.8844   7836.47     0.23    -285.18     0.13
     8   0.8846   7832.76     0.18    -284.92     0.17
     9   0.8848   7829.63    -0.16    -284.84     0.07
    10   0.8900   7724.51     0.11    -277.31     0.12
    11   0.8901   7722.40     0.01    -277.34    -0.03
    12   0.8902   7720.69 (   0.10)   -276.76 (   0.44)
    13   0.8903   7718.42    -0.36    -277.19    -0.09
    14   1.0621   3413.81     0.01    -280.72    -0.03
    15   1.0621   3412.05     0.00    -280.82    -0.01
    16   3.0031  14969.99    -0.06    -669.80     0.04
    17   3.0034  14961.91     0.08    -670.07    -0.04
    18   3.0036  14957.71    -0.02    -670.22    -0.09

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.

17DL160    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.220    43.238    43.201
ecceobj         0.077     0.076     0.077
incobj          5.529     5.529     5.529
qmin           39.511    39.540    39.456
qmax           47.586    47.620    47.638
amean          43.446    43.471    43.442
amin           43.099    43.130    43.099
amax           43.817    43.840    43.810
emean           0.067     0.066     0.067
emin            0.049     0.047     0.047
emax            0.087     0.087     0.088
imean           3.530     3.525     3.493
imin            2.645     2.643     2.587
imax            4.356     4.347     4.347
excite_mean     0.092     0.091     0.091
fracstop        1.000     1.000     1.000
cjmean          3.085     3.085     3.085

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       183.9     183.7     183.4
kozaiamp        180.0     180.0     179.9