Orbit Fit and Astrometric record for 17DR164

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: 17DR164   
# Created Tue Apr  1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting     21 observations of     21
# Arc:   3.00y
# First observation: 2016/04/04
#  Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.000021   0.023045  -0.000003   0.000913   0.023683   0.000000
# Chi-squared of fit:     9.48 DOF:     36 RMS:  0.12
# Min/Max residuals:    -0.34    0.33
# Exact a, adot, b, bdot, g, gdot:
  1.511230E-05  2.310656E-02  9.002934E-07  9.138657E-04  2.384081E-02  1.440192E-03
# Covariance matrix:
  7.3231E-13 -9.6579E-13  1.7157E-14 -3.1798E-14 -3.2046E-13 -1.0460E-11
 -9.6579E-13  1.9499E-12 -4.6264E-14  7.4887E-14  7.9035E-14  2.4206E-11
  1.7157E-14 -4.6264E-14  2.2399E-13 -1.5035E-13  5.7144E-15 -6.3399E-13
 -3.1798E-14  7.4887E-14 -1.5035E-13  1.4779E-13 -1.0316E-15  1.0118E-12
 -3.2046E-13  7.9035E-14  5.7144E-15 -1.0316E-15  5.8450E-13  3.6500E-14
 -1.0460E-11  2.4206E-11 -6.3399E-13  1.0118E-12  3.6500E-14  3.2639E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.640077 -171.370620   -0.107236    0.063010   -0.988380  2457482.943323
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:           59.53897 +/-     0.113
Argument of Peri:      350.62878 +/-     0.179
Long of Asc Node:      131.18003 +/-     0.011
Inclination:             4.20956 +/-     0.000
Eccentricity:         0.07254856 +/-    0.0008
Semi-Major Axis:     44.38641689 +/-    0.0116
Time of Perihelion: 2439616.7614 +/-      33.2
Perihelion:          41.16624645 +/-    0.0365
Aphelion:            47.60658732 +/-    0.0371
Period (y)              295.7218 +/-      0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -42.35314523 +/-    0.0013
Ecliptic Y           -6.53811956 +/-    0.0002
Ecliptic Z            2.66309045 +/-    0.0001
Ecliptic XDOT         0.00024167 +/-    0.0000
Ecliptic YDOT        -0.00265424 +/-    0.0000
Ecliptic ZDOT         0.00011524 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.93748909 +/-    0.0013
Geocenter to KBO     41.94488487 +/-    0.0013
# Hcoef:  8.06

The following table shows the complete astrometric record for 17DR164. 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 (17DR164) followed by the observatory code and reference code for the source of the astrometry.

2016 04  04.442534 12 37 26.41   -00 04 30.9         17DR164   T09  C~83F2      
2016 04  04.545119 12 37 25.95   -00 04 28.0         17DR164   T09  C~83F2      
2017 02  21.48870  12 45 12.73   -00 52 26.3   24.3z 17DR164   T09  C~81Bw      
2017 02  21.53656  12 45 12.57   -00 52 25.2   24.6z 17DR164   T09  C~81Bw      
2017 02  21.56076  12 45 12.50   -00 52 24.3   24.7z 17DR164   T09  C~81Bw      
2017 02  21.58766  12 45 12.43   -00 52 24.0   24.4z 17DR164   T09  C~81Bw      
2017 02  21.60643  12 45 12.35   -00 52 23.5   24.1z 17DR164   T09  C~81Bw      
2017 02  21.60910  12 45 12.35   -00 52 23.5   23.7z 17DR164   T09  C~81Bw      
2017 02  23.56973  12 45 05.99   -00 51 34.9   24.7r 17DR164   T09  C~81Bw      
2017 02  23.60376  12 45 05.87   -00 51 33.9   24.6r 17DR164   T09  C~81Bw      
2017 02  23.61219  12 45 05.85   -00 51 33.6   24.3r 17DR164   T09  C~81Bw      
2017 02  23.64192  12 45 05.75   -00 51 33.1   23.9r 17DR164   T09  C~81Bw      
2017 02  23.64401  12 45 05.74   -00 51 32.8   24.3r 17DR164   T09  C~81Bw      
2017 03  04.54160  12 44 34.26   -00 47 39.9   24.0y 17DR164   T09  C~81Bw      
2017 03  04.58510  12 44 34.12   -00 47 38.9   24.2y 17DR164   T09  C~81Bw      
2017 03  04.59585  12 44 34.07   -00 47 38.7   23.9y 17DR164   T09  C~81Bw      
2017 03  04.63382  12 44 33.91   -00 47 37.4   24.0y 17DR164   T09  C~81Bw      
2017 04  27.380876 12 40 49.33   -00 23 12.8         17DR164   T09  C~83F2      
2017 04  27.426120 12 40 49.15   -00 23 11.7         17DR164   T09  C~83F2      
2019 04  06.350099 12 52 10.92   -01 28 46.6         17DR164   T09  C~83F2      
2019 04  06.501697 12 52 10.24   -01 28 42.4         17DR164   T09  C~83F2      

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     0.04       0.00    -0.06
     2   0.0003     -7.48    -0.04      -0.05    -0.07
     3   0.8845   7565.12    -0.03     106.34     0.01
     4   0.8846   7562.47    -0.06     106.41    -0.08
     5   0.8846   7561.15    -0.06     106.82     0.26
     6   0.8847   7560.07     0.33     106.69     0.03
     7   0.8848   7558.77     0.05     106.67    -0.04
     8   0.8848   7558.77     0.20     106.67    -0.05
     9   0.8901   7451.81     0.05     113.88    -0.05
    10   0.8902   7449.76    -0.08     114.09     0.05
    11   0.8903   7449.37    -0.00     114.25     0.18
    12   0.8903   7447.79     0.10     114.12    -0.04
    13   0.8904   7447.53    -0.04     114.34     0.17
    14   0.9147   6921.20    -0.34     142.93    -0.01
    15   0.9148   6918.88     0.10     143.02    -0.02
    16   0.9149   6918.11     0.01     142.91    -0.16
    17   0.9150   6915.39    -0.30     143.16     0.00
    18   1.0621   3239.99     0.07     165.48    -0.08
    19   1.0622   3237.08     0.00     165.43    -0.01
    20   3.0032  14208.02     0.04     565.46     0.00
    21   3.0036  14196.94    -0.03     565.32    -0.05

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.

17DR164    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.920    43.957    43.884
ecceobj         0.069     0.072     0.068
incobj          4.216     4.217     4.216
qmin           39.952    39.870    40.011
qmax           48.552    48.684    48.455
amean          44.135    44.171    44.099
amin           43.792    43.819    43.755
amax           44.512    44.548    44.474
emean           0.075     0.077     0.074
emin            0.060     0.062     0.059
emax            0.091     0.094     0.090
imean           3.204     3.200     3.208
imin            2.538     2.540     2.539
imax            3.868     3.861     3.875
excite_mean     0.094     0.096     0.093
fracstop        1.000     1.000     1.000
cjmean          3.092     3.093     3.092

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       177.9     178.6     177.7
kozaiamp        180.0     180.0     180.0