Orbit Fit and Astrometric record for 17DQ164

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: 17DQ164   
# Created Thu Oct 31 01:10:33 2024
# Orbit generated from Bernstein formalism
# Fitting     30 observations of     30
# Arc:   0.90y
# First observation: 2016/04/02
#  Last observation: 2017/02/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000062   0.021873  -0.000000   0.000069   0.022818   0.000000
# Chi-squared of fit:    11.68 DOF:     54 RMS:  0.11
# Min/Max residuals:    -0.27    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.434187E-05  2.174024E-02  5.970766E-08  7.099143E-05  2.317610E-02 -1.855596E-03
# Covariance matrix:
  2.8032E-13  2.6414E-12  9.8574E-15 -1.6182E-14  1.2845E-12  1.1235E-10
  2.6414E-12  2.0318E-10  5.1870E-13 -1.0916E-12  7.2053E-11  7.3532E-09
  9.8574E-15  5.1870E-13  1.4487E-13 -1.8271E-13  1.9190E-13  1.9077E-11
 -1.6182E-14 -1.0916E-12 -1.8271E-13  3.5074E-13 -3.9064E-13 -3.9674E-11
  1.2845E-12  7.2053E-11  1.9190E-13 -3.9064E-13  2.6412E-11  2.6412E-09
  1.1235E-10  7.3532E-09  1.9077E-11 -3.9674E-11  2.6412E-09  2.6761E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.031251 -174.425710   -0.124898    0.035150   -0.987125  2457480.894196
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          272.10889 +/-     2.229
Argument of Peri:      182.16936 +/-     1.706
Long of Asc Node:      100.82475 +/-     0.049
Inclination:             1.99349 +/-     0.000
Eccentricity:         0.08180866 +/-    0.0234
Semi-Major Axis:     43.97770388 +/-    0.1564
Time of Perihelion: 2483487.4664 +/-     644.8
Perihelion:          40.37994670 +/-    1.0375
Aphelion:            47.57546107 +/-    1.0414
Period (y)              291.6467 +/-      1.56
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -43.89152835 +/-    0.0095
Ecliptic Y           -4.41150912 +/-    0.0009
Ecliptic Z            1.52938510 +/-    0.0003
Ecliptic XDOT         0.00046790 +/-    0.0001
Ecliptic YDOT        -0.00254176 +/-    0.0000
Ecliptic ZDOT         0.00000062 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.13917413 +/-    0.0095
Geocenter to KBO     43.14789778 +/-    0.0096
# Hcoef:  7.94

The following table shows the complete astrometric record for 17DQ164. 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 (17DQ164) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.393407 12 23 41.16   -00 20 57.1         17DQ164   T09  C~83F2      
2016 04  02.515196 12 23 40.63   -00 20 53.7         17DQ164   T09  C~83F2      
2016 04  04.36377  12 23 32.79   -00 20 03.5   25.6g 17DQ164   T09  C~89UX      
2016 04  04.38940  12 23 32.66   -00 20 02.9   26.1g 17DQ164   T09  C~89UX      
2016 04  04.40648  12 23 32.60   -00 20 02.4   25.4g 17DQ164   T09  C~89UX      
2016 04  04.41735  12 23 32.54   -00 20 02.4   25.7g 17DQ164   T09  C~89UX      
2016 06  04.25539  12 20 29.77   -00 02 08.9   23.8z 17DQ164   T09  C~8COu      
2016 06  04.27307  12 20 29.73   -00 02 08.7   23.9z 17DQ164   T09  C~8COu      
2016 06  04.28926  12 20 29.72   -00 02 08.5   23.4z 17DQ164   T09  C~8COu      
2016 06  04.32166  12 20 29.68   -00 02 08.5   23.8z 17DQ164   T09  C~8COu      
2016 06  04.34327  12 20 29.66   -00 02 08.2   23.7z 17DQ164   T09  C~8COu      
2016 06  05.311488 12 20 28.63   -00 02 04.5         17DQ164   T09  C~83F2      
2016 06  05.356114 12 20 28.59   -00 02 04.3         17DQ164   T09  C~83F2      
2017 01  23.60759  12 32 08.23   -01 16 57.6   24.1i 17DQ164   T09  C~81Bw      
2017 01  23.61828  12 32 08.22   -01 16 57.6   24.0i 17DQ164   T09  C~81Bw      
2017 01  23.65191  12 32 08.17   -01 16 57.0   24.1i 17DQ164   T09  C~81Bw      
2017 01  28.61959  12 32 00.45   -01 15 53.6   24.2z 17DQ164   T09  C~81Bw      
2017 01  28.62228  12 32 00.45   -01 15 53.6   23.9z 17DQ164   T09  C~81Bw      
2017 01  28.64259  12 32 00.42   -01 15 53.5   23.9z 17DQ164   T09  C~81Bw      
2017 01  28.64799  12 32 00.41   -01 15 53.3   24.1z 17DQ164   T09  C~81Bw      
2017 01  28.65069  12 32 00.41   -01 15 53.3   24.0z 17DQ164   T09  C~81Bw      
2017 01  28.65336  12 32 00.41   -01 15 53.1   24.4z 17DQ164   T09  C~81Bw      
2017 02  02.60942  12 31 50.76   -01 14 38.2   23.9i 17DQ164   T09  C~81Bw      
2017 02  02.64454  12 31 50.71   -01 14 37.5   23.8i 17DQ164   T09  C~81Bw      
2017 02  23.52167  12 30 51.70   -01 07 31.2   24.9r 17DQ164   T09  C~81Bw      
2017 02  23.52446  12 30 51.68   -01 07 31.4   24.4r 17DQ164   T09  C~81Bw      
2017 02  23.56346  12 30 51.54   -01 07 30.2   24.4r 17DQ164   T09  C~81Bw      
2017 02  23.59748  12 30 51.43   -01 07 29.7   24.5r 17DQ164   T09  C~81Bw      
2017 02  23.62726  12 30 51.32   -01 07 28.7   24.3r 17DQ164   T09  C~81Bw      
2017 02  23.63774  12 30 51.29   -01 07 28.7   24.7r 17DQ164   T09  C~81Bw      

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     0.10       0.00    -0.00
     2   0.0003     -8.65     0.04      -0.03     0.06
     3   0.0054   -136.51     0.06      -0.48     0.16
     4   0.0055   -138.54    -0.17      -0.71    -0.04
     5   0.0055   -139.56     0.01      -0.60     0.08
     6   0.0055   -140.39    -0.06      -0.96    -0.27
     7   0.1721  -3083.15     0.17    -100.65    -0.07
     8   0.1722  -3083.78    -0.15    -100.71    -0.07
     9   0.1722  -3083.99    -0.07    -100.58     0.10
    10   0.1723  -3084.54    -0.04    -100.82    -0.04
    11   0.1723  -3084.94    -0.05    -100.66     0.18
    12   0.1750  -3100.59     0.02    -103.38    -0.08
    13   0.1751  -3101.22     0.13    -103.44     0.00
    14   0.8110   8318.71    -0.03     -76.81     0.07
    15   0.8110   8318.58     0.09     -76.87    -0.01
    16   0.8111   8317.65    -0.02     -76.61     0.17
    17   0.8247   8186.03    -0.18     -64.15    -0.02
    18   0.8247   8186.03    -0.10     -64.15    -0.03
    19   0.8248   8185.58     0.07     -64.23    -0.15
    20   0.8248   8185.36     0.02     -64.11    -0.04
    21   0.8248   8185.36     0.10     -64.11    -0.05
    22   0.8248   8185.28     0.10     -63.92     0.13
    23   0.8384   8022.49    -0.17     -52.35    -0.27
    24   0.8385   8021.53     0.16     -52.00     0.01
    25   0.8956   7038.81     0.02     -10.42     0.20
    26   0.8956   7038.61    -0.02     -10.72    -0.10
    27   0.8957   7036.21    -0.16     -10.45     0.12
    28   0.8958   7034.49     0.10     -10.64    -0.11
    29   0.8959   7032.58    -0.08     -10.38     0.12
    30   0.8959   7032.16     0.11     -10.56    -0.07

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.

17DQ164    quality flag:2

Type:         7:4EEE CLASSICAL CLASSICAL

axisobj        43.521    44.133    43.344
ecceobj         0.083     0.154     0.033
incobj          1.993     1.993     1.993
qmin           39.391    36.636    41.459
qmax           48.323    52.603    45.857
amean          43.726    44.391    43.561
amin           43.339    44.008    43.229
amax           44.133    44.841    43.909
emean           0.084     0.150     0.028
emin            0.072     0.123     0.010
emax            0.096     0.173     0.045
imean           0.841     1.871     0.863
imin            0.066     0.238     0.074
imax            1.424     3.511     1.382
excite_mean     0.085     0.154     0.033
fracstop        1.000     1.000     1.000
cjmean          3.089     3.077     3.095

libcent 0       179.1    -180.0    -180.0
libamp  0       109.8    -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       113.4     181.8     176.9
kozaiamp        180.0     180.0     180.0