Orbit Fit and Astrometric record for 17OX166

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: 17OX166   
# Created Tue Apr  1 01:11:07 2025
# Orbit generated from Bernstein formalism
# Fitting     24 observations of     24
# Arc:   3.07y
# First observation: 2017/07/20
#  Last observation: 2020/08/13
Preliminary a, adot, b, bdot, g, gdot:
  -0.000000   0.024914  -0.000000  -0.000570   0.024757   0.000000
# Chi-squared of fit:     0.39 DOF:     42 RMS:  0.02
# Min/Max residuals:    -0.05    0.05
# Exact a, adot, b, bdot, g, gdot:
  1.580446E-05  2.498898E-02 -3.440760E-07 -5.723133E-04  2.478995E-02  8.476445E-04
# Covariance matrix:
  2.8796E-13  5.8316E-12  1.3814E-15 -1.3413E-13  4.7286E-12  7.9248E-11
  5.8316E-12  8.1060E-10  1.8943E-13 -1.8382E-11  6.4925E-10  1.0862E-08
  1.3814E-15  1.8943E-13  2.4470E-13 -8.7865E-14  1.5179E-13  2.5385E-12
 -1.3413E-13 -1.8382E-11 -8.7865E-14  4.5498E-13 -1.4725E-11 -2.4632E-10
  4.7286E-12  6.4925E-10  1.5179E-13 -1.4725E-11  5.2065E-10  8.7011E-09
  7.9248E-11  1.0862E-08  2.5385E-12 -2.4632E-10  8.7011E-09  1.4555E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.087911  -77.054758   -0.258886    0.035748   -0.978475  2457954.754051
# Heliocentric elements and errors
Epoch:              2457950.5000  =  2017/07/16
Mean Anomaly:           29.50079 +/-     8.051
Argument of Peri:       88.62637 +/-     9.838
Long of Asc Node:      160.18649 +/-     0.015
Inclination:             2.43304 +/-     0.000
Eccentricity:         0.08014622 +/-    0.0086
Semi-Major Axis:     44.33808895 +/-    0.0093
Time of Perihelion: 2449113.7000 +/-    2411.6
Perihelion:          40.78455888 +/-    0.3812
Aphelion:            47.89161901 +/-    0.3812
Period (y)              295.2390 +/-      0.09
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            9.50033251 +/-    0.0083
Ecliptic Y          -40.18892502 +/-    0.0362
Ecliptic Z            1.46971210 +/-    0.0014
Ecliptic XDOT         0.00271572 +/-    0.0000
Ecliptic YDOT         0.00051893 +/-    0.0000
Ecliptic ZDOT        -0.00005986 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.32270641 +/-    0.0352
Geocenter to KBO     40.33892641 +/-    0.0371
# Hcoef: 10.24

The following table shows the complete astrometric record for 17OX166. 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 (17OX166) followed by the observatory code and reference code for the source of the astrometry.

2017 07  20.25325  18 55 23.844  -20 43 52.20  26.0r 17OX166   266  C~6c3b      
2017 07  20.39364  18 55 23.141  -20 43 53.31  26.0r 17OX166   266  C~6c3b      
2017 07  20.53088  18 55 22.454  -20 43 54.35  26.0r 17OX166   266  C~6c3b      
2017 07  21.24888  18 55 18.945  -20 43 59.92  26.2r 17OX166   266  C~6c3b      
2017 07  21.40987  18 55 18.143  -20 44 01.19  26.2r 17OX166   266  C~6c3b      
2017 07  21.54551  18 55 17.468  -20 44 02.21  26.2r 17OX166   266  C~6c3b      
2020 05  28.44674  19 17 45.985  -20 14 27.71  26.0r 17OX166   266  C~6c3b      
2020 05  28.50129  19 17 45.786  -20 14 28.00  26.0r 17OX166   266  C~6c3b      
2020 05  28.55756  19 17 45.580  -20 14 28.29  26.0r 17OX166   266  C~6c3b      
2020 05  30.43935  19 17 38.734  -20 14 38.15  26.4r 17OX166   266  C~6c3b      
2020 05  30.53044  19 17 38.388  -20 14 38.66  26.4r 17OX166   266  C~6c3b      
2020 05  30.61862  19 17 38.053  -20 14 39.14  26.4r 17OX166   266  C~6c3b      
2020 06  20.45583  19 16 08.480  -20 17 03.18  26.4r 17OX166   266  C~6c3b      
2020 06  20.52860  19 16 08.126  -20 17 03.77  26.4r 17OX166   266  C~6c3b      
2020 06  20.62233  19 16 07.671  -20 17 04.52  26.4r 17OX166   266  C~6c3b      
2020 06  22.44948  19 15 58.907  -20 17 19.69  26.4r 17OX166   266  C~6c3b      
2020 06  22.52092  19 15 58.555  -20 17 20.29  26.4r 17OX166   266  C~6c3b      
2020 06  22.59118  19 15 58.210  -20 17 20.87  26.4r 17OX166   266  C~6c3b      
2020 06  25.44823  19 15 44.276  -20 17 45.24  26.6r 17OX166   266  C~6c3b      
2020 06  25.53072  19 15 43.862  -20 17 45.95  26.6r 17OX166   266  C~6c3b      
2020 06  25.61487  19 15 43.442  -20 17 46.66  26.6r 17OX166   266  C~6c3b      
2020 08  13.24332  19 11 49.454  -20 25 27.48  26.6r 17OX166   266  C~6c3b      
2020 08  13.33331  19 11 49.086  -20 25 28.30  26.6r 17OX166   266  C~6c3b      
2020 08  13.42301  19 11 48.718  -20 25 29.10  26.6r 17OX166   266  C~6c3b      

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    -0.00
     2   0.0004     -9.92     0.03      -0.17    -0.00
     3   0.0008    -19.62     0.03      -0.28    -0.00
     4   0.0027    -69.15    -0.03      -1.14     0.00
     5   0.0032    -80.47    -0.03      -1.33     0.00
     6   0.0035    -89.99    -0.04      -1.45     0.01
     7   2.8561  18990.15    -0.03    -366.52    -0.04
     8   2.8563  18987.31    -0.02    -366.45    -0.05
     9   2.8564  18984.37    -0.02    -366.36    -0.04
    10   2.8616  18886.74     0.02    -363.68     0.00
    11   2.8618  18881.81     0.01    -363.55     0.00
    12   2.8621  18877.03     0.02    -363.42    -0.01
    13   2.9191  17598.60    -0.02    -344.86     0.02
    14   2.9193  17593.55    -0.02    -344.81     0.02
    15   2.9196  17587.06    -0.02    -344.75     0.02
    16   2.9246  17461.93     0.04    -344.16     0.01
    17   2.9248  17456.90     0.04    -344.13     0.01
    18   2.9249  17451.98     0.05    -344.09     0.01
    19   2.9328  17253.04    -0.00    -343.47     0.02
    20   2.9330  17247.13    -0.01    -343.44     0.02
    21   2.9332  17241.14    -0.01    -343.40     0.02
    22   3.0664  13899.89    -0.01    -395.03    -0.00
    23   3.0666  13894.63     0.00    -395.22    -0.00
    24   3.0669  13889.38    -0.01    -395.39    -0.00

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.

17OX166    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.947    44.090    43.912
ecceobj         0.071     0.100     0.062
incobj          2.429     2.428     2.430
qmin           40.336    39.187    40.691
qmax           48.272    49.801    47.831
amean          44.189    44.345    44.147
amin           43.841    43.986    43.797
amax           44.551    44.741    44.512
emean           0.068     0.097     0.059
emin            0.052     0.081     0.043
emax            0.084     0.113     0.075
imean           2.576     2.584     2.581
imin            1.924     1.904     1.926
imax            3.220     3.276     3.218
excite_mean     0.082     0.108     0.075
fracstop        1.000     1.000     1.000
cjmean          3.096     3.092     3.097

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       173.3     173.2     173.2
kozaiamp        180.0     180.0     179.9