Orbit Fit and Astrometric record for 02PR170

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: 02PR170   
# Created Mon Dec 18 02:37:12 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   13 observations of   13
# Arc:  12.81y
# First observation: 2002/08/05
#  Last observation: 2015/05/28
# Chi-squared of fit:    72.67 DOF:   20 RMS:  0.42
# Min/Max residuals:    -0.92    0.82
# Exact a, adot, b, bdot, g, gdot:
  9.116371E-06  1.304138E-02  3.939430E-06  1.406149E-04  2.127968E-02 -1.701345E-02
# Covariance matrix:
  8.9493E-13  6.5742E-10 -3.0521E-13  7.2628E-12  1.1221E-10  2.7980E-09
  6.5742E-10  8.5058E-07 -3.9478E-10  9.3966E-09  1.4416E-07  3.6197E-06
 -3.0521E-13 -3.9478E-10  3.6809E-13 -4.3758E-12 -6.6908E-11 -1.6800E-09
  7.2628E-12  9.3966E-09 -4.3758E-12  1.0381E-10  1.5925E-09  3.9988E-08
  1.1221E-10  1.4416E-07 -6.6908E-11  1.5925E-09  2.4435E-08  6.1347E-07
  2.7980E-09  3.6197E-06 -1.6800E-09  3.9988E-08  6.1347E-07  1.5404E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.735764  -33.754021    0.240412   -0.012774   -0.989626  2452491.909723
# Heliocentric elements and errors
Epoch:              2452492.5000  =  2002/08/06
Mean Anomaly:          331.22389 +/-    33.458
Argument of Peri:       84.87006 +/-    32.497
Long of Asc Node:       14.08061 +/-     0.177
Inclination:             0.96755 +/-     0.003
Eccentricity:         0.81069812 +/-    0.0613
Semi-Major Axis:     62.59924342 +/-    1.5736
Time of Perihelion: 2466952.9467 +/-   17946.3
Perihelion:          11.85015446 +/-    3.8502
Aphelion:           113.34833238 +/-    4.7805
Period (y)              495.2926 +/-     18.68
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           39.75764798 +/-    0.2691
Ecliptic Y          -26.85278339 +/-    0.1799
Ecliptic Z           -0.60323199 +/-    0.0041
Ecliptic XDOT        -0.00089511 +/-    0.0005
Ecliptic YDOT         0.00260850 +/-    0.0002
Ecliptic ZDOT         0.00004641 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   47.98086740 +/-    0.2447
Geocenter to KBO     46.99382189 +/-    0.3238
# Hcoef:  8.31

The following table shows the complete astrometric record for 02PR170. 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 (02PR170) followed by the observatory code and reference code for the source of the astrometry.

2002 08  05.40898  21 54 58.23   -13 27 38.8   24.0R 02PR170   568  Cp2009      
2002 08  05.46821  21 54 57.97   -13 27 40.0   23.6R 02PR170   568  Cp2009      
2002 08  05.53088  21 54 57.72   -13 27 41.2   23.9R 02PR170   568  Cp2009      
2002 08  08.38708  21 54 45.60   -13 28 45.8         02PR170   568  Cp2009      
2002 09  04.14068  21 52 50.47   -13 38 45.0         02PR170   309  Cp2009      
2002 09  04.14680  21 52 50.45   -13 38 45.3         02PR170   309  Cp2009      
2002 09  04.18376  21 52 50.29   -13 38 46.1         02PR170   309  Cp2009      
2002 09  04.18988  21 52 50.26   -13 38 46.2         02PR170   309  Cp2009      
2015 05  27.361839 22 45 22.80   -08 30 39.7   24.0r 02PR170   W84  C~1j7U      
2015 05  27.383308 22 45 22.82   -08 30 39.7   24.6r 02PR170   W84  C~1j7U      
2015 05  27.404799 22 45 22.86   -08 30 39.4   24.6r 02PR170   W84  C~1j7U      
2015 05  27.426352 22 45 22.89   -08 30 39.2   24.8r 02PR170   W84  C~1j7U      
2015 05  28.361081 22 45 24.07   -08 30 33.5   24.5r 02PR170   W84  C~1j7U      

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     0.05       0.00     0.26
  2   0.0002      0.00     0.34       0.00    -0.56
  3   0.0003      0.00     0.61       0.00    -0.37
  4   0.0082      0.00    -0.09       0.00    -0.92
  5   0.0814      0.00    -0.18       0.00     0.82
  6   0.0814      0.00    -0.09       0.00     0.65
  7   0.0815      0.00    -0.13       0.00     0.65
  8   0.0815      0.00    -0.19       0.00     0.68
  9  12.8075      0.00    -0.19       0.00     0.08
 10  12.8076      0.00    -0.28       0.00    -0.06
 11  12.8077      0.00    -0.06       0.00     0.09
 12  12.8077      0.00     0.00       0.00     0.14
 13  12.8103      0.00     0.54       0.00    -0.26

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.

02PR170    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        63.227    63.226    63.229
ecceobj         0.810     0.810     0.810
incobj          0.961     0.961     0.961
qmin           11.901    11.921    11.920
qmax          118.978   118.157   117.441
amean          63.783    63.482    62.851
amin           62.179    62.181    61.498
amax           65.439    65.066    64.704
emean           0.812     0.811     0.809
emin            0.808     0.808     0.806
emax            0.818     0.816     0.815
imean           1.855     1.855     1.822
imin            1.830     1.824     1.788
imax            1.893     1.893     1.893
excite_mean     0.813     0.812     0.810
fracstop        0.001     0.001     0.001
cjmean          2.169     2.172     2.175

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        83.3      83.1      87.0
kozaiamp          0.8       1.0       4.8