Orbit Fit and Astrometric record for 17DN160

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: 17DN160   
# Created Tue Apr  1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting     13 observations of     13
# Arc:   3.00y
# First observation: 2016/04/04
#  Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.000095   0.020679  -0.000002   0.000032   0.022243   0.000000
# Chi-squared of fit:     3.74 DOF:     20 RMS:  0.09
# Min/Max residuals:    -0.24    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.439129E-05  2.054993E-02 -1.498646E-07  2.989330E-05  2.237965E-02 -1.421107E-03
# Covariance matrix:
  7.3288E-13 -9.6607E-13 -4.4801E-16 -1.0007E-15 -3.3135E-13 -1.1668E-11
 -9.6607E-13  1.9159E-12 -5.3093E-15  3.5519E-15  2.0821E-13  2.6426E-11
 -4.4801E-16 -5.3093E-15  2.9541E-13 -1.6340E-13  8.5860E-15 -9.1726E-14
 -1.0007E-15  3.5519E-15 -1.6340E-13  1.4646E-13 -1.5507E-15  5.5703E-14
 -3.3135E-13  2.0821E-13  8.5860E-15 -1.5507E-15  7.8838E-13  2.0782E-12
 -1.1668E-11  2.6426E-11 -9.1726E-14  5.5703E-14  2.0782E-12  3.9605E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    5.315786 -170.243394   -0.088083    0.092059   -0.987999  2457482.963558
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          261.51291 +/-     0.175
Argument of Peri:      195.37486 +/-     0.161
Long of Asc Node:      100.56314 +/-     0.012
Inclination:             5.20040 +/-     0.000
Eccentricity:         0.06796886 +/-    0.0009
Semi-Major Axis:     45.02457870 +/-    0.0068
Time of Perihelion: 2487669.5675 +/-      53.2
Perihelion:          41.96430954 +/-    0.0427
Aphelion:            48.08484785 +/-    0.0428
Period (y)              302.1222 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -44.81443113 +/-    0.0017
Ecliptic Y           -7.79728757 +/-    0.0003
Ecliptic Z            4.13972032 +/-    0.0002
Ecliptic XDOT         0.00059709 +/-    0.0000
Ecliptic YDOT        -0.00245524 +/-    0.0000
Ecliptic ZDOT        -0.00001246 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.67568517 +/-    0.0017
Geocenter to KBO     44.68344227 +/-    0.0018
# Hcoef:  7.07

The following table shows the complete astrometric record for 17DN160. 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 (17DN160) followed by the observatory code and reference code for the source of the astrometry.

2016 04  04.462769 12 44 12.39   +01 01 28.5         17DN160   T09  C~81Bu      
2016 04  04.530127 12 44 12.10   +01 01 30.2         17DN160   T09  C~81Bu      
2017 02  21.50220  12 51 12.90   +00 15 09.3   23.4z 17DN160   T09  C~7xU0      
2017 02  21.52305  12 51 12.84   +00 15 10.3   23.7z 17DN160   T09  C~7xU0      
2017 02  21.52572  12 51 12.84   +00 15 10.1   23.4z 17DN160   T09  C~7xU0      
2017 02  23.58243  12 51 06.64   +00 15 59.5   23.7r 17DN160   T09  C~7xU0      
2017 02  23.61428  12 51 06.55   +00 16 00.4   23.7r 17DN160   T09  C~7xU0      
2017 03  06.641649 12 50 29.61   +00 20 41.1         17DN160   T09  C~81Bu      
2017 03  25.267116 12 49 17.018  +00 29 05.60  23.5V 17DN160   W84  C~8HKV      
2017 04  27.399658 12 47 02.69   +00 42 39.3         17DN160   T09  C~81Bu      
2017 04  27.420264 12 47 02.61   +00 42 39.7         17DN160   T09  C~81Bu      
2019 04  06.405562 12 57 12.99   -00 21 24.1         17DN160   T09  C~81Bu      
2019 04  06.473958 12 57 12.69   -00 21 22.2         17DN160   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     0.03       0.00     0.04
     2   0.0002     -4.67    -0.03      -0.14    -0.04
     3   0.8844   6894.45    -0.01     -82.31    -0.24
     4   0.8845   6893.23    -0.16     -81.74     0.24
     5   0.8845   6893.31     0.05     -81.93     0.05
     6   0.8901   6788.27     0.01     -72.98    -0.07
     7   0.8902   6786.67     0.10     -72.68     0.11
     8   0.9204   6166.26     0.10     -31.89    -0.01
     9   0.9714   4965.90    -0.16       4.93    -0.01
    10   1.0621   2792.60     0.03     -37.04    -0.02
    11   1.0622   2791.34     0.02     -37.14    -0.05
    12   3.0033  12736.83     0.08      19.90    -0.03
    13   3.0035  12731.93    -0.08      19.88     0.03

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.

17DN160    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.539    44.559    44.520
ecceobj         0.071     0.071     0.072
incobj          5.199     5.199     5.199
qmin           41.008    41.057    40.961
qmax           48.813    48.808    48.789
amean          44.792    44.811    44.772
amin           44.438    44.460    44.417
amax           45.172    45.194    45.149
emean           0.067     0.067     0.068
emin            0.052     0.052     0.053
emax            0.081     0.080     0.081
imean           3.423     3.424     3.421
imin            2.931     2.933     2.924
imax            3.986     3.982     3.987
excite_mean     0.090     0.090     0.091
fracstop        1.000     1.000     1.000
cjmean          3.101     3.102     3.101

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       179.7     180.0     179.8
kozaiamp        180.0     180.0     179.9