Orbit Fit and Astrometric record for 02GR32

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: 02GR32    
# Created Sat Oct 21 01:37:18 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   16 observations of   16
# Arc:  15.07y
# First observation: 2002/04/07
#  Last observation: 2017/05/02
# Chi-squared of fit:    20.46 DOF:   26 RMS:  0.20
# Min/Max residuals:    -0.32    0.73
# Exact a, adot, b, bdot, g, gdot:
  2.079975E-05  4.680677E-02  1.824348E-06  2.715714E-03  3.572641E-02  3.520886E-03
# Covariance matrix:
  7.3988E-13 -3.6761E-11  1.5522E-14 -2.0079E-12  4.3987E-12 -4.4252E-11
 -3.6761E-11  3.1042E-08 -1.2801E-11  1.6741E-09  4.2485E-09  3.6806E-08
  1.5522E-14 -1.2801E-11  2.4970E-13 -7.1300E-13 -1.7442E-12 -1.5178E-11
 -2.0079E-12  1.6741E-09 -7.1300E-13  9.0870E-11  2.2857E-10  1.9850E-09
  4.3987E-12  4.2485E-09 -1.7442E-12  2.2857E-10  7.7810E-10  5.0231E-09
 -4.4252E-11  3.6806E-08 -1.5178E-11  1.9850E-09  5.0231E-09  4.3642E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.077399 -151.399230    0.194510    0.001284   -0.984298  2452371.661073
# Heliocentric elements and errors
Epoch:              2452372.5000  =  2002/04/08
Mean Anomaly:           10.22615 +/-     0.013
Argument of Peri:      342.59978 +/-     0.005
Long of Asc Node:      206.92046 +/-     0.000
Inclination:             3.32634 +/-     0.000
Eccentricity:         0.27794344 +/-    0.0001
Semi-Major Axis:     39.66434816 +/-    0.0001
Time of Perihelion: 2449780.6573 +/-       3.2
Perihelion:          28.63990266 +/-    0.0036
Aphelion:            50.68879366 +/-    0.0036
Period (y)              249.8093 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -25.53127989 +/-    0.0004
Ecliptic Y          -13.69455271 +/-    0.0002
Ecliptic Z            0.03784764 +/-    0.0000
Ecliptic XDOT         0.00147209 +/-    0.0000
Ecliptic YDOT        -0.00327968 +/-    0.0000
Ecliptic ZDOT         0.00020870 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   28.97216074 +/-    0.0004
Geocenter to KBO     27.99048813 +/-    0.0005
# Hcoef:  8.72

The following table shows the complete astrometric record for 02GR32. 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 (02GR32) followed by the observatory code and reference code for the source of the astrometry.

2002 04  07.16033  13 46 25.02   -10 54 17.3   21.8R 02GR32    807  Cf5154      
2002 04  07.22458  13 46 24.61   -10 54 14.9         02GR32    807  Cf5154      
2002 04  11.31682  13 45 59.29   -10 51 46.2   22.0R 02GR32    695  Cg5851      
2002 04  11.38175  13 45 58.89   -10 51 44.1         02GR32    695  Cg5851      
2002 04  11.38398  13 45 58.89   -10 51 43.8   22.2R 02GR32    568  Cf5154      
2002 04  11.46556  13 45 58.38   -10 51 40.6         02GR32    568  Cf5154      
2015 05  27.192487 15 53 18.55   -18 19 22.0   23.8r 02GR32    W84  C~1j7T      
2015 05  27.214114 15 53 18.42   -18 19 21.5   23.7r 02GR32    W84  C~1j7T      
2015 05  27.235762 15 53 18.27   -18 19 21.0   24.1r 02GR32    W84  C~1j7T      
2015 05  27.292647 15 53 17.90   -18 19 19.9   23.6r 02GR32    W84  C~1j7T      
2015 05  27.314291 15 53 17.76   -18 19 19.4   23.5r 02GR32    W84  C~1j7T      
2015 05  27.335929 15 53 17.61   -18 19 18.9   23.4r 02GR32    W84  C~1j7T      
2015 05  28.313157 15 53 11.40   -18 18 59.3   23.8r 02GR32    W84  C~1j7T      
2015 05  28.334857 15 53 11.25   -18 18 59.0   23.8r 02GR32    W84  C~1j7T      
2017 05  02.37673  16 15 00.49   -19 07 30.8   23.7R 02GR32    G37  C~2FZE      
2017 05  02.44192  16 15 00.14   -19 07 29.7         02GR32    G37  C~2FZE      

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    -0.24       0.00     0.73
  2   0.0002      0.00    -0.12       0.00    -0.05
  3   0.0114      0.00    -0.04       0.00     0.06
  4   0.0116      0.00     0.15       0.00    -0.22
  5   0.0116      0.00     0.14       0.00    -0.06
  6   0.0118      0.00     0.28       0.00     0.16
  7  13.1363      0.00     0.12       0.00     0.00
  8  13.1364      0.00     0.27       0.00     0.06
  9  13.1364      0.00     0.13       0.00     0.12
 10  13.1366      0.00     0.10       0.00     0.06
 11  13.1366      0.00     0.10       0.00     0.11
 12  13.1367      0.00    -0.06       0.00     0.17
 13  13.1394      0.00     0.11       0.00     0.08
 14  13.1394      0.00    -0.05       0.00    -0.07
 15  15.0697      0.00    -0.20       0.00    -0.29
 16  15.0699      0.00     0.24       0.00    -0.32

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.

02GR32    quality flag:2

Type:       CENTAURR      3:2E  CENTAURR

axisobj        39.396    39.396    39.395
ecceobj         0.273     0.273     0.273
incobj          3.330     3.330     3.330
qmin           28.023    28.023    28.023
qmax           54.087    51.896    52.284
amean          39.471    39.456    39.453
amin           38.754    38.859    37.877
amax           41.530    40.189    40.395
emean           0.277     0.276     0.277
emin            0.263     0.263     0.251
emax            0.302     0.291     0.294
imean           4.872     4.656     4.807
imin            3.883     3.883     3.883
imax            6.299     5.255     6.745
excite_mean     0.289     0.288     0.289
fracstop        0.421     1.000     0.332
cjmean          2.954     2.955     2.954

libcent 0      -180.0     181.3    -180.0
libamp  0      -180.0     132.4    -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       145.7     155.0     139.6
kozaiamp        180.0     180.0     180.0