Orbit Fit and Astrometric record for 02PY170

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: 02PY170   
# Created Sat Oct 20 01:08:00 2018
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   15 observations of   15
# Arc:  11.98y
# First observation: 2002/08/05
#  Last observation: 2014/07/29
# Chi-squared of fit:    26.50 DOF:   24 RMS:  0.23
# Min/Max residuals:    -0.44    0.66
# Exact a, adot, b, bdot, g, gdot:
  1.568500E-05  2.274898E-02 -1.950914E-06 -9.432240E-04  2.377914E-02  8.990681E-04
# Covariance matrix:
  3.2196E-13 -2.3222E-14 -1.0368E-15 -2.5515E-16  3.4132E-13  2.3554E-14
 -2.3222E-14  3.2302E-13  9.1286E-15 -1.3755E-14  5.0682E-13  1.1689E-12
 -1.0368E-15  9.1286E-15  1.3962E-13 -1.6712E-14  1.2995E-14  3.3476E-14
 -2.5515E-16 -1.3755E-14 -1.6712E-14  7.0054E-15 -2.3090E-14 -5.0929E-14
  3.4132E-13  5.0682E-13  1.2995E-14 -2.3090E-14  1.4918E-12  1.9658E-12
  2.3554E-14  1.1689E-12  3.3476E-14 -5.0929E-14  1.9658E-12  4.3283E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.885753  -31.181208    0.283860   -0.032249   -0.977593  2452491.954163
# Heliocentric elements and errors
Epoch:              2452492.5000  =  2002/08/06
Mean Anomaly:           95.64284 +/-     0.226
Argument of Peri:      118.43797 +/-     0.205
Long of Asc Node:      110.85580 +/-     0.003
Inclination:             3.01951 +/-     0.000
Eccentricity:         0.03127984 +/-    0.0001
Semi-Major Axis:     42.85616342 +/-    0.0071
Time of Perihelion: 2425267.4726 +/-      64.7
Perihelion:          41.51562953 +/-    0.0080
Aphelion:            44.19669731 +/-    0.0084
Period (y)              280.5615 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           36.64880567 +/-    0.0018
Ecliptic Y          -22.50478292 +/-    0.0011
Ecliptic Z           -1.38390089 +/-    0.0001
Ecliptic XDOT         0.00143378 +/-    0.0000
Ecliptic YDOT         0.00218655 +/-    0.0000
Ecliptic ZDOT        -0.00011174 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.02921916 +/-    0.0017
Geocenter to KBO     42.05367710 +/-    0.0022
# Hcoef:  7.95

The following table shows the complete astrometric record for 02PY170. 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 (02PY170) followed by the observatory code and reference code for the source of the astrometry.

2002 08  05.45342  22 06 32.20   -13 39 07.9   23.5R 02PY170   568  Cp2010      
2002 08  05.51719  22 06 31.93   -13 39 09.4   23.6R 02PY170   568  Cp2010      
2002 08  05.57902  22 06 31.66   -13 39 11.0   23.7R 02PY170   568  Cp2010      
2002 08  09.43904  22 06 14.87   -13 40 47.3         02PY170   568  Cp2010      
2002 09  04.22708  22 04 19.18   -13 51 28.5         02PY170   309  Cp2010      
2002 09  04.27107  22 04 19.00   -13 51 29.5         02PY170   309  Cp2010      
2003 10  29.04600  22 06 30.99   -13 41 49.0         02PY170   309  Cp2010      
2003 10  29.12327  22 06 30.88   -13 41 49.3         02PY170   309  Cp2010      
2004 09  16.14969  22 13 35.14   -13 07 22.9         02PY170   675  Cp2010      
2004 09  16.18371  22 13 34.99   -13 07 23.9         02PY170   675  Cp2010      
2004 09  17.16011  22 13 31.05   -13 07 45.5         02PY170   675  Cp2010      
2004 09  17.29230  22 13 30.49   -13 07 48.4         02PY170   675  Cp2010      
2004 09  17.30167  22 13 30.49   -13 07 48.6         02PY170   675  Cp2010      
2014 07  29.38138  23 06 25.26   -08 23 23.8   25.0R 02PY170   G37  C~16a9      
2014 07  29.42936  23 06 25.10   -08 23 24.7         02PY170   G37  C~16a9      

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    -0.16       0.00     0.23
  2   0.0002      0.00    -0.02       0.00     0.31
  3   0.0003      0.00    -0.01       0.00     0.24
  4   0.0109      0.00    -0.17       0.00     0.22
  5   0.0815      0.00     0.10       0.00     0.03
  6   0.0816      0.00     0.35       0.00     0.06
  7   1.2309      0.00     0.09       0.00    -0.44
  8   1.2311      0.00     0.05       0.00    -0.36
  9   2.1155      0.00    -0.21       0.00     0.25
 10   2.1156      0.00    -0.34       0.00     0.01
 11   2.1183      0.00     0.29       0.00    -0.15
 12   2.1187      0.00     0.08       0.00    -0.16
 13   2.1187      0.00     0.66       0.00    -0.16
 14  11.9806      0.00     0.05       0.00    -0.00
 15  11.9808      0.00    -0.02       0.00     0.18

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.

02PY170    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.173    43.173    43.172
ecceobj         0.030     0.030     0.030
incobj          3.016     3.016     3.016
qmin           41.180    41.179    41.183
qmax           45.154    45.154    45.146
amean          43.074    43.074    43.074
amin           42.745    42.745    42.743
amax           43.418    43.420    43.413
emean           0.021     0.021     0.021
emin            0.002     0.003     0.001
emax            0.040     0.040     0.040
imean           1.743     1.743     1.743
imin            0.764     0.764     0.764
imax            2.524     2.524     2.524
excite_mean     0.039     0.039     0.039
fracstop        1.000     1.000     1.000
cjmean          3.089     3.089     3.089

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       180.7     180.6     180.8
kozaiamp        180.0     180.0     180.0