Orbit Fit and Astrometric record for 54520

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: 54520     
# Created Sun Oct 22 01:36:21 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   24 observations of   24
# Arc:   3.05y
# First observation: 1999/07/21
#  Last observation: 2002/08/09
# Chi-squared of fit:   171.28 DOF:   42 RMS:  0.47
# Min/Max residuals:    -0.76    1.31
# Exact a, adot, b, bdot, g, gdot:
  1.820958E-05  3.008068E-02  3.628319E-06  2.948508E-03  2.636409E-02  1.655708E-02
# Covariance matrix:
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.095147  -55.827862    0.113644    0.019012   -1.007187  2451380.846353
# Heliocentric elements and errors
Epoch:              2451380.5000  =  1999/07/21
Mean Anomaly:            7.05378 +/-     0.000
Argument of Peri:      303.99156 +/-     0.000
Long of Asc Node:      293.28006 +/-     0.000
Inclination:             5.70895 +/-     0.000
Eccentricity:         0.76640354 +/-    0.0000
Semi-Major Axis:    122.86960608 +/-    0.0000
Time of Perihelion: 2441633.2010 +/-       0.0
Perihelion:          28.70190502 +/-    0.0000
Aphelion:           217.03730713 +/-    0.0000
Period (y)             1361.9931 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           21.78112263 +/-    0.0000
Ecliptic Y          -32.27152455 +/-    0.0000
Ecliptic Z            0.72511566 +/-    0.0000
Ecliptic XDOT         0.00354334 +/-    0.0000
Ecliptic YDOT         0.00034563 +/-    0.0000
Ecliptic ZDOT         0.00033905 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.94053745 +/-    0.0000
Geocenter to KBO     37.93002704 +/-    0.0000
# Hcoef:  7.99

The following table shows the complete astrometric record for 54520. 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 (54520) followed by the observatory code and reference code for the source of the astrometry.

1999 07  21.34561  20 24 54.44   -18 09 00.2   23.5R 54520     568  Ca7328      
1999 07  21.37354  20 24 54.32   -18 09 00.6         54520     568  Ca7328      
1999 07  21.40087  20 24 54.16   -18 09 01.0         54520     568  Ca7328      
1999 08  09.19260  20 23 18.18   -18 13 59.3   23.6R 54520     675  Ca7328      
1999 08  09.22064  20 23 18.05   -18 14 00.0   23.5R 54520     675  Ca7328      
1999 08  09.24318  20 23 17.93   -18 14 00.3   23.8R 54520     675  Ca7328      
2000 07  31.12387  20 30 46.37   -17 37 48.7   22.9R 54520     807  Ch1299      
2000 07  31.19562  20 30 46.03   -17 37 50.3         54520     807  Ch1299      
2000 08  05.34368  20 30 20.08   -17 39 15.9   24.1R 54520     568  Cb8005      
2000 08  05.39259  20 30 19.85   -17 39 16.7         54520     568  Cb8005      
2000 08  05.43348  20 30 19.63   -17 39 17.3   23.5R 54520     568  Cb8005      
2000 08  06.33657  20 30 15.18   -17 39 32.2   24.1R 54520     568  Cb8005      
2000 08  06.37780  20 30 14.97   -17 39 32.9         54520     568  Cb8005      
2000 09  23.25607  20 27 07.72   -17 50 07.7   23.7R 54520     568  Cc0967      
2000 09  23.30561  20 27 07.61   -17 50 07.9   24.0R 54520     568  Cc0967      
2000 09  23.35371  20 27 07.50   -17 50 08.6   24.7R 54520     568  Cc0967      
2000 09  24.24408  20 27 05.49   -17 50 17.0   24.1R 54520     568  Cc0967      
2000 09  24.29365  20 27 05.39   -17 50 17.3   23.8R 54520     568  Cc0967      
2000 09  24.35187  20 27 05.28   -17 50 17.8         54520     568  Cc0967      
2001 07  25.33834  20 37 46.38   -17 02 26.6   23.3R 54520     568  Cd3309      
2001 07  25.39242  20 37 46.11   -17 02 27.4         54520     568  Cd3309      
2001 07  25.44965  20 37 45.82   -17 02 28.2   23.0R 54520     568  Cd3309      
2001 07  26.36443  20 37 41.27   -17 02 44.0         54520     568  Cd3309      
2002 08  09.12072  20 42 49.96   -16 33 18.4   22.2R 54520     807  Ch1299      

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    -0.20       0.00    -0.73
  2   0.0001      0.00     0.49       0.00    -0.32
  3   0.0002      0.00     0.23       0.00    -0.29
  4   0.0516      0.00    -0.07       0.00     0.54
  5   0.0517      0.00     0.11       0.00     0.29
  6   0.0517      0.00     0.02       0.00     0.35
  7   1.0288      0.00    -0.07       0.00     0.16
  8   1.0290      0.00     0.35       0.00    -0.25
  9   1.0431      0.00    -0.76       0.00    -0.47
 10   1.0432      0.00    -0.48       0.00    -0.46
 11   1.0434      0.00    -0.65       0.00    -0.39
 12   1.0458      0.00     0.01       0.00    -0.41
 13   1.0459      0.00    -0.01       0.00    -0.42
 14   1.1770      0.00     0.17       0.00     1.11
 15   1.1772      0.00     0.28       0.00     1.31
 16   1.1773      0.00     0.32       0.00     0.99
 17   1.1797      0.00    -0.37       0.00    -0.40
 18   1.1799      0.00    -0.19       0.00    -0.31
 19   1.1800      0.00     0.13       0.00    -0.37
 20   2.0123      0.00     0.63       0.00    -0.03
 21   2.0124      0.00     0.66       0.00     0.09
 22   2.0126      0.00     0.64       0.00     0.25
 23   2.0151      0.00     0.29       0.00    -0.18
 24   3.0521      0.00    -0.60       0.00    -0.14

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.

54520    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj       122.127   122.130   122.123
ecceobj         0.765     0.765     0.765
incobj          5.714     5.714     5.714
qmin           27.790    27.782    27.738
qmax          227.200   228.708   261.160
amean         114.068   122.723   128.997
amin          101.977   117.690   122.079
amax          127.895   128.758   145.140
emean           0.747     0.765     0.776
emin            0.713     0.751     0.761
emax            0.776     0.777     0.800
imean           9.005     8.183     7.749
imin            7.233     7.233     7.233
imax           10.538     8.952     8.420
excite_mean     0.763     0.779     0.788
fracstop        0.058     0.049     0.059
cjmean          2.814     2.815     2.815

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       322.8     318.0     315.3
kozaiamp         18.2      13.7      12.1