Orbit Fit and Astrometric record for 02PA171

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: 02PA171   
# Created Sat Oct 21 01:37:20 2017
# Orbit generated from Bernstein formalism
# Fitting   18 observations of   18
# Arc:  11.17y
# First observation: 2002/08/05
#  Last observation: 2013/10/07
Preliminary a, adot, b, bdot, g, gdot:
  -0.000113   0.018928   0.000004  -0.000643   0.021410   0.000000
# Chi-squared of fit:    27.01 DOF:   30 RMS:  0.22
# Min/Max residuals:    -0.54    0.42
# Exact a, adot, b, bdot, g, gdot:
  1.361754E-05  1.872536E-02 -1.381690E-06 -6.346060E-04  2.140637E-02 -1.807587E-04
# Covariance matrix:
  2.4091E-13 -7.0261E-14 -1.6651E-15  2.4913E-15  2.4950E-13 -3.7748E-13
 -7.0261E-14  1.7017E-13  3.0101E-15 -5.9046E-15  8.0538E-14  8.2639E-13
 -1.6651E-15  3.0101E-15  1.0625E-13 -1.3168E-14  5.6041E-18  1.5701E-14
  2.4913E-15 -5.9046E-15 -1.3168E-14  7.0780E-15 -1.8874E-15 -3.0204E-14
  2.4950E-13  8.0538E-14  5.6041E-18 -1.8874E-15  7.1221E-13  1.9442E-13
 -3.7748E-13  8.2639E-13  1.5701E-14 -3.0204E-14  1.9442E-13  4.2493E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.611050  -31.137903    0.284556   -0.027556   -0.977533  2452491.956773
# Heliocentric elements and errors
Epoch:              2452490.5000  =  2002/08/04
Mean Anomaly:          193.62222 +/-     0.076
Argument of Peri:       27.30933 +/-     0.068
Long of Asc Node:      109.61023 +/-     0.004
Inclination:             2.51127 +/-     0.000
Eccentricity:         0.08116596 +/-    0.0001
Semi-Major Axis:     44.19028633 +/-    0.0060
Time of Perihelion: 2502079.0569 +/-      20.2
Perihelion:          40.60353952 +/-    0.0074
Aphelion:            47.77703314 +/-    0.0081
Period (y)              293.7639 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           40.65876056 +/-    0.0016
Ecliptic Y          -24.89022385 +/-    0.0010
Ecliptic Z           -1.31340535 +/-    0.0001
Ecliptic XDOT         0.00120892 +/-    0.0000
Ecliptic YDOT         0.00206045 +/-    0.0000
Ecliptic ZDOT        -0.00008027 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   47.69049263 +/-    0.0014
Geocenter to KBO     46.71506788 +/-    0.0018
# Hcoef:  6.75

The following table shows the complete astrometric record for 02PA171. 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 (02PA171) followed by the observatory code and reference code for the source of the astrometry.

2002 08  05.45603  22 06 18.47   -13 22 47.0   23.1R 02PA171   568  Cp2010      
2002 08  05.51978  22 06 18.22   -13 22 48.4   23.0R 02PA171   568  Cp2010      
2002 08  05.58203  22 06 17.97   -13 22 49.7   23.2R 02PA171   568  Cp2010      
2002 08  09.44155  22 06 02.61   -13 24 17.0         02PA171   568  Cp2010      
2002 09  05.94351  22 04 09.97   -13 34 37.5         02PA171   493  Cp2010      
2002 09  06.02081  22 04 09.69   -13 34 39.5         02PA171   493  Cp2010      
2002 09  07.04631  22 04 05.58   -13 35 01.1         02PA171   493  Cp2010      
2002 09  30.27614  22 02 42.42   -13 42 14.1   23.3R 02PA171   568  Cp2010      
2002 09  30.33141  22 02 42.24   -13 42 15.0   23.3R 02PA171   568  Cp2010      
2002 09  30.39322  22 02 42.07   -13 42 15.6   23.5R 02PA171   568  Cp2010      
2003 07  29.16576  22 10 57.10   -12 59 27.3         02PA171   809  Cp2010      
2003 07  29.25858  22 10 56.76   -12 59 29.4         02PA171   809  Cp2010      
2004 09  11.23045  22 12 07.47   -12 55 36.1         02PA171   695  Cp2010      
2004 09  11.28885  22 12 07.23   -12 55 37.4         02PA171   695  Cp2010      
2004 09  16.14320  22 11 48.68   -12 57 17.8         02PA171   675  Cp2010      
2004 09  16.17111  22 11 48.59   -12 57 18.2         02PA171   675  Cp2010      
2013 10  06.28721  22 47 51.87   -09 46 53.0   23.0R 02PA171   695  C~0zdL      
2013 10  07.19455  22 47 48.94   -09 47 10.0         02PA171   695  C~0zdL      

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     0.04       0.00     0.19
  2   0.0002     -3.91     0.13      -0.03     0.19
  3   0.0003     -7.78     0.15       0.02     0.27
  4   0.0109   -248.29    -0.05      -3.35     0.24
  5   0.0862  -2004.58    -0.29     -11.77    -0.04
  6   0.0864  -2009.10     0.05     -12.22    -0.54
  7   0.0892  -2072.81    -0.23     -11.62    -0.18
  8   0.1528  -3360.16     0.00       3.17     0.23
  9   0.1530  -3362.94    -0.09       3.24     0.22
 10   0.1531  -3365.47     0.37       3.53     0.42
 11   0.9794   4302.12    -0.07    -122.93    -0.08
 12   0.9796   4296.73    -0.01    -123.13    -0.20
 13   2.1021   5346.47     0.08    -271.83    -0.24
 14   2.1022   5342.72    -0.07    -271.80    -0.26
 15   2.1155   5053.38    -0.15    -269.31    -0.24
 16   2.1156   5052.01     0.13    -269.22    -0.16
 17  11.1700  39293.32    -0.27   -1449.42     0.30
 18  11.1725  39245.11     0.27   -1448.44    -0.11

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.

02PA171    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.502    44.520    44.484
ecceobj         0.074     0.074     0.074
incobj          2.509     2.509     2.509
qmin           39.956    39.968    39.939
qmax           49.119    49.094    49.138
amean          44.403    44.420    44.385
amin           44.051    44.058    44.029
amax           44.783    44.797    44.768
emean           0.081     0.081     0.081
emin            0.066     0.065     0.066
emax            0.097     0.096     0.098
imean           1.131     1.125     1.138
imin            0.394     0.395     0.393
imax            1.746     1.738     1.754
excite_mean     0.084     0.083     0.084
fracstop        1.000     1.000     1.000
cjmean          3.098     3.098     3.098

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       190.8     191.1     190.4
kozaiamp        180.0     179.9     179.9