Orbit Fit and Astrometric record for 17DM160

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: 17DM160   
# Created Tue Apr  1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting     16 observations of     16
# Arc:   3.00y
# First observation: 2016/04/04
#  Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.000048   0.021000   0.000002  -0.001087   0.022526   0.000000
# Chi-squared of fit:     4.42 DOF:     26 RMS:  0.09
# Min/Max residuals:    -0.20    0.15
# Exact a, adot, b, bdot, g, gdot:
  1.416596E-05  2.096446E-02 -7.554939E-07 -1.086580E-03  2.270641E-02 -4.562666E-05
# Covariance matrix:
  3.6324E-13 -4.8408E-13 -8.2613E-15  1.9961E-14 -1.5354E-13 -5.7703E-12
 -4.8408E-13  1.3788E-12  2.2507E-14 -6.7635E-14 -5.8723E-14  1.9813E-11
 -8.2613E-15  2.2507E-14  2.0054E-13 -1.0059E-13  4.4250E-15  3.4162E-13
  1.9961E-14 -6.7635E-14 -1.0059E-13  9.5093E-14  3.9737E-15 -1.0418E-12
 -1.5354E-13 -5.8723E-14  4.4250E-15  3.9737E-15  6.1008E-13 -1.4376E-12
 -5.7703E-12  1.9813E-11  3.4162E-13 -1.0418E-12 -1.4376E-12  3.0542E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.798489 -169.848795   -0.081247    0.083184   -0.989371  2457482.963558
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          179.37067 +/-     2.380
Argument of Peri:      302.85656 +/-     2.379
Long of Asc Node:       67.87647 +/-     0.007
Inclination:             5.55138 +/-     0.000
Eccentricity:         0.01961945 +/-    0.0001
Semi-Major Axis:     44.16752659 +/-    0.0077
Time of Perihelion: 2511275.1170 +/-     708.6
Perihelion:          43.30098406 +/-    0.0099
Aphelion:            45.03406911 +/-    0.0101
Period (y)              293.5370 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -44.16573591 +/-    0.0015
Ecliptic Y           -7.99240375 +/-    0.0003
Ecliptic Z            3.68404989 +/-    0.0001
Ecliptic XDOT         0.00044025 +/-    0.0000
Ecliptic YDOT        -0.00249619 +/-    0.0000
Ecliptic ZDOT        -0.00013101 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.03402014 +/-    0.0015
Geocenter to KBO     44.04042207 +/-    0.0015
# Hcoef:  8.05

The following table shows the complete astrometric record for 17DM160. 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 (17DM160) followed by the observatory code and reference code for the source of the astrometry.

2016 04  04.462769 12 44 50.54   +00 23 40.7         17DM160   T09  C~81Bu      
2016 04  04.517316 12 44 50.29   +00 23 42.1         17DM160   T09  C~81Bu      
2016 04  06.486196 12 44 41.98   +00 24 32.6         17DM160   T09  C~81Bu      
2016 04  06.608062 12 44 41.46   +00 24 35.9         17DM160   T09  C~81Bu      
2017 02  21.50220  12 51 52.47   -00 26 15.9   24.0z 17DM160   T09  C~7xU0      
2017 02  21.51771  12 51 52.42   -00 26 15.5   24.3z 17DM160   T09  C~7xU0      
2017 02  21.56882  12 51 52.25   -00 26 14.2   24.4z 17DM160   T09  C~7xU0      
2017 02  21.59034  12 51 52.20   -00 26 14.0   24.1z 17DM160   T09  C~7xU0      
2017 02  21.61177  12 51 52.13   -00 26 13.5   23.6z 17DM160   T09  C~7xU0      
2017 02  23.61428  12 51 46.00   -00 25 27.0   24.6r 17DM160   T09  C~7xU0      
2017 02  23.64611  12 51 45.90   -00 25 26.1   24.6r 17DM160   T09  C~7xU0      
2017 04  27.384634 12 47 38.26   +00 00 49.7         17DM160   T09  C~81Bu      
2017 04  27.411358 12 47 38.16   +00 00 50.2         17DM160   T09  C~81Bu      
2019 04  06.40557  12 57 45.86   -01 10 57.6   25.0i 17DM160   T09  C~81Bu      
2019 04  06.46315  12 57 45.63   -01 10 55.9   25.2i 17DM160   T09  C~81Bu      
2019 04  06.50438  12 57 45.45   -01 10 54.9   24.2i 17DM160   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     0.09       0.00    -0.00
     2   0.0001     -4.00    -0.12      -0.18    -0.10
     3   0.0055   -138.47     0.04      -2.52    -0.12
     4   0.0059   -146.94    -0.02      -2.54     0.06
     5   0.8844   6999.59     0.08    -279.08     0.08
     6   0.8845   6998.75     0.03    -279.00     0.11
     7   0.8846   6995.89    -0.20    -278.81     0.15
     8   0.8847   6995.12     0.14    -278.91    -0.02
     9   0.8847   6993.96     0.08    -278.87    -0.04
    10   0.8902   6891.03    -0.05    -272.07    -0.05
    11   0.8903   6889.29    -0.09    -271.83     0.10
    12   1.0621   2851.92    -0.03    -276.39    -0.05
    13   1.0621   2850.34     0.04    -276.52    -0.07
    14   3.0033  12940.94    -0.12    -673.11    -0.20
    15   3.0034  12937.08     0.06    -672.90     0.11
    16   3.0035  12934.19     0.06    -673.03     0.04

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.

17DM160    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.708    43.733    43.684
ecceobj         0.031     0.030     0.031
incobj          5.559     5.558     5.559
qmin           41.799    41.836    41.749
qmax           46.269    46.287    46.242
amean          43.936    43.961    43.912
amin           43.597    43.631    43.573
amax           44.288    44.306    44.266
emean           0.030     0.030     0.031
emin            0.015     0.015     0.016
emax            0.045     0.045     0.045
imean           3.980     3.984     3.975
imin            3.331     3.339     3.316
imax            4.555     4.553     4.550
excite_mean     0.076     0.076     0.076
fracstop        1.000     1.000     1.000
cjmean          3.094     3.094     3.093

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       182.5     181.8     182.8
kozaiamp        179.9     180.0     179.9