Orbit Fit and Astrometric record for 17FD163

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: 17FD163   
# Created Tue Nov 30 02:14:03 2021
# Orbit generated from Bernstein formalism
# Fitting     13 observations of     13
# Arc:   1.14y
# First observation: 2017/03/25
#  Last observation: 2018/05/15
Preliminary a, adot, b, bdot, g, gdot:
   0.000023   0.010663  -0.000003  -0.002390   0.016616   0.000000
# Chi-squared of fit:    24.38 DOF:     20 RMS:  0.24
# Min/Max residuals:    -0.60    0.44
# Exact a, adot, b, bdot, g, gdot:
  9.819149E-06  1.071485E-02 -1.482257E-06 -2.407620E-03  1.663436E-02  2.714685E-03
# Covariance matrix:
  5.0275E-13  3.6921E-13 -3.5215E-15 -1.9903E-13  1.1644E-12  8.3105E-11
  3.6921E-13  5.4889E-12 -2.2179E-14 -1.3286E-12  7.5673E-12  5.5608E-10
 -3.5215E-15 -2.2179E-14  3.8955E-13 -3.7143E-13 -3.8114E-14 -2.4203E-12
 -1.9903E-13 -1.3286E-12 -3.7143E-13  8.7256E-13 -2.0116E-12 -1.4876E-10
  1.1644E-12  7.5673E-12 -3.8114E-14 -2.0116E-12  1.2160E-11  8.3750E-10
  8.3105E-11  5.5608E-10 -2.4203E-12 -1.4876E-10  8.3750E-10  6.2321E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   -4.244797  160.724332   -0.394989   -0.067333   -0.909495  2457837.592601
# Heliocentric elements and errors
Epoch:              2457830.5000  =  2017/03/18
Mean Anomaly:          127.13801 +/-     2.478
Argument of Peri:       45.95902 +/-     2.091
Long of Asc Node:      323.10681 +/-     0.007
Inclination:            13.31396 +/-     0.005
Eccentricity:         0.36580752 +/-    0.0073
Semi-Major Axis:     47.59556959 +/-    0.2628
Time of Perihelion: 2415473.8978 +/-     747.5
Perihelion:          30.18475239 +/-    0.3862
Aphelion:            65.00638679 +/-    0.5002
Period (y)              328.3659 +/-      2.72
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -57.58537234 +/-    0.0119
Ecliptic Y           19.71400290 +/-    0.0042
Ecliptic Z           -4.44980983 +/-    0.0009
Ecliptic XDOT        -0.00097161 +/-    0.0000
Ecliptic YDOT        -0.00153386 +/-    0.0000
Ecliptic ZDOT        -0.00042833 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   61.02882782 +/-    0.0113
Geocenter to KBO     60.11651976 +/-    0.0126
# Hcoef:  6.86

The following table shows the complete astrometric record for 17FD163. 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 (17FD163) followed by the observatory code and reference code for the source of the astrometry.

2017 03  25.09180  10 42 24.224  +03 36 51.83  24.6r 17FD163   807  C~31Lz      
2017 03  25.18432  10 42 23.929  +03 36 53.90  24.7r 17FD163   807  C~31Lz      
2017 03  26.17398  10 42 21.010  +03 37 12.20  24.6r 17FD163   807  C~31Lz      
2017 05  20.22178  10 40 43.577  +03 48 53.68        17FD163   G37  C~31Lz      
2018 03  11.10997  10 45 13.401  +03 10 49.18        17FD163   304  C~31Lz      
2018 03  11.17002  10 45 13.201  +03 10 49.93  24.6r 17FD163   304  C~31Lz      
2018 03  11.24009  10 45 12.974  +03 10 51.54        17FD163   304  C~31Lz      
2018 03  12.14828  10 45 09.943  +03 11 09.38        17FD163   304  C~31Lz      
2018 03  12.22608  10 45 09.684  +03 11 10.93        17FD163   304  C~31Lz      
2018 05  15.18273  10 42 49.088  +03 27 05.60        17FD163   G37  C~31Lz      
2018 05  15.19010  10 42 49.084  +03 27 05.57        17FD163   G37  C~31Lz      
2018 05  15.24396  10 42 49.044  +03 27 06.02        17FD163   G37  C~31Lz      
2018 05  15.25138  10 42 49.036  +03 27 06.12        17FD163   G37  C~31Lz      

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     0.08       0.00    -0.17
     2   0.0003     -4.87    -0.24       0.26     0.09
     3   0.0030    -52.24     0.18       0.77     0.24
     4   0.1537  -1667.44    -0.03     102.41    -0.24
     5   0.9610   2935.37     0.29    -493.73     0.20
     6   0.9612   2932.31     0.44    -494.16    -0.18
     7   0.9614   2928.55     0.43    -493.95     0.10
     8   0.9639   2879.77    -0.57    -494.53     0.07
     9   0.9641   2875.59    -0.60    -494.56     0.11
    10   1.1392    565.48     0.03    -403.08    -0.04
    11   1.1392    565.44     0.07    -403.13    -0.11
    12   1.1394    564.71    -0.01    -402.94    -0.05
    13   1.1394    564.56    -0.07    -402.89    -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.

17FD163    quality flag:1

Type:           2:1E  CENTAURR  CENTAURS

axisobj        47.460    48.332    46.813
ecceobj         0.374     0.395     0.356
incobj         13.350    13.361    13.339
qmin           29.394    28.151    28.965
qmax           67.594    70.073    80.698
amean          47.795    48.003    51.190
amin           47.022    46.713    45.611
amax           48.791    49.338    55.620
emean           0.372     0.399     0.400
emin            0.359     0.375     0.314
emax            0.387     0.420     0.451
imean          14.659    14.272    14.095
imin           14.267    13.336    10.955
imax           15.076    14.940    16.878
excite_mean     0.450     0.469     0.469
fracstop        1.000     0.111     1.000
cjmean          2.892     2.866     2.904

libcent 0       180.8    -180.0    -180.0
libamp  0       161.2    -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       169.2     149.4     175.3
kozaiamp        180.0      79.6     180.0