Orbit Fit and Astrometric record for 69988

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: 69988     
# Created Fri Nov 28 02:36:36 2014
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   24 observations of   26
# Arc:   5.00y
# First observation: 1998/10/22
#  Last observation: 2003/10/22
# Chi-squared of fit:   135.28 DOF:   42 RMS:  0.42
# Min/Max residuals:    -0.92    1.05
# Exact a, adot, b, bdot, g, gdot:
  1.945624E-05  2.866915E-02  2.415298E-06  4.562328E-03  2.658694E-02  9.951416E-03
# 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
    2.777858   37.434808    0.144484    0.047158   -0.976638  2451108.840261
# Heliocentric elements and errors
Epoch:              2451108.5000  =  1998/10/22
Mean Anomaly:           27.10872 +/-     0.000
Argument of Peri:      310.40182 +/-     0.000
Long of Asc Node:       20.67250 +/-     0.000
Inclination:             9.43048 +/-     0.000
Eccentricity:         0.43496524 +/-    0.0000
Semi-Major Axis:     55.90649340 +/-    0.0000
Time of Perihelion: 2439611.1339 +/-       0.0
Perihelion:          31.58911216 +/-    0.0000
Aphelion:            80.22387465 +/-    0.0000
Period (y)              418.0244 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           30.70307869 +/-    0.0000
Ecliptic Y           23.31544049 +/-    0.0000
Ecliptic Z            1.82294183 +/-    0.0000
Ecliptic XDOT        -0.00100015 +/-    0.0000
Ecliptic YDOT         0.00296167 +/-    0.0000
Ecliptic ZDOT         0.00051889 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.59527057 +/-    0.0000
Geocenter to KBO     37.61227280 +/-    0.0000
# Hcoef:  7.21

The following table shows the complete astrometric record for 69988. 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 (69988) followed by the observatory code and reference code for the source of the astrometry.

1998 10  22.33953  02 16 33.37   +16 37 01.2   23.4R 69988     695  Ch1098      
1998 10  22.47242  02 16 32.66   +16 36 58.0         69988     695  Ch1098      
1998 10  22.49896  02 16 32.59   +16 36 57.5         69988     695  Ch1098      
1998 11  18.08751  02 14 16.22   +16 26 29.7   22.8R 69988     695  Ca3373      
1998 11  18.15650  02 14 15.84   +16 26 27.9         69988     695  Ca3373      
1998 11  18.24171  02 14 15.42   +16 26 26.1         69988     695  Ca3373      
1998 11  19.07963  02 14 11.38   +16 26 06.3   22.5R 69988     695  Ca3373      
1998 11  19.16041  02 14 11.00   +16 26 04.5         69988     695  Ca3373      
1998 12  17.83243  02 12 16.71   +16 16 23.3         69988     950  Ca3608      
1998 12  17.86950  02 12 16.68   +16 16 21.8         69988     950  Ca3608      
1998 12  17.90432  02 12 16.56   +16 16 20.2         69988     950  Ca3608      
2000 01  06.29250  02 17 37.46   +16 59 04.4         69988     568  Cc9443      
2000 01  06.32548  02 17 37.41   +16 59 03.8         69988     568  Cc9443      
2000 01  07.28238  02 17 36.24   +16 58 56.0         69988     568  Cc9443      
2000 01  07.31050  02 17 36.21   +16 58 55.5         69988     568  Cc9443      
2000 02  05.09634  02 17 45.90   +16 58 31.3   23.2R 69988     695  Cj9811      
2000 02  05.10277  02 17 45.86   +16 58 32.5         69988     695  Cj9811      
2000 02  05.19148  02 17 46.01   +16 58 33.1         69988     695  Cj9811      
2000 12  24.23678  02 23 58.83   +17 46 36.3         69988     568  Cc9443      
2000 12  24.34670  02 23 58.51   +17 46 34.6         69988     568  Cc9443      
2000 12  28.28859  02 23 49.021  +17 45 40.44  23.3R 69988     568  Cl8213      
2000 12  28.35747  02 23 48.856  +17 45 39.61  23.2R 69988     568  Cl8213      
2003 10  22.31297  02 46 20.85   +20 14 21.3   23.3R 69988     304  Ci9217      
2003 10  22.32738  02 46 20.79   +20 14 20.3         69988     304  Ci9217      
2008 12  22.23212  03 09 28.89   +22 55 52.0   22.4r 69988     695  C~0hly      
2008 12  22.32328  03 09 28.55   +22 55 50.4   22.4r 69988     695  C~0hly      

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    -0.15       0.00    -0.73
  2   0.0004      0.00    -0.63       0.00    -0.26
  3   0.0004      0.00     0.40       0.00    -0.15
  4   0.0732      0.00     0.88       0.00     0.25
  5   0.0734      0.00     0.26       0.00     0.05
  6   0.0737      0.00     0.26       0.00     0.24
  7   0.0759      0.00     0.18       0.00     0.07
  8   0.0762      0.00     0.38       0.00     0.13
  9   0.1547      0.00    -0.92       0.00     1.05
 10   0.1548      0.00     0.31       0.00     0.14
 11   0.1549      0.00     0.09       0.00    -0.90
 12   1.2073      0.00    -0.36       0.00     0.11
 13   1.2074      0.00    -0.44       0.00    -0.21
 14   1.2100      0.00    -0.50       0.00    -0.04
 15   1.2101      0.00    -0.42       0.00    -0.30
 16   1.2889      0.00     0.86       0.00    -0.92
 17   1.2889      0.00     0.09       0.00     0.23
 18   1.2891      0.00    -0.03       0.00     0.26
 19   2.1736      0.00     0.30       0.00    -0.02
 20   2.1739      0.00    -0.06       0.00    -0.11
 21   2.1847      0.00     0.18       0.00     0.26
 22   2.1849      0.00     0.10       0.00     0.33
 23   4.9992      0.00 (  -6.60)      0.00 (   4.81)
 24   4.9993      0.00 (  -6.41)      0.00 (   4.07)
 25  10.1681      0.00     0.04       0.00     0.02
 26  10.1683      0.00     0.03       0.00     0.01

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.

69988    quality flag:3

Type:         5:2EEE    5:2EEE    5:2EEE

axisobj        55.912    55.912    55.911
ecceobj         0.434     0.434     0.434
incobj          9.432     9.432     9.432
qmin           30.958    30.963    30.960
qmax           81.460    81.458    81.483
amean          55.462    55.462    55.462
amin           54.680    54.629    54.688
amax           56.529    56.533    56.533
emean           0.431     0.431     0.431
emin            0.419     0.419     0.419
emax            0.443     0.442     0.443
imean           9.478     9.475     9.474
imin            9.143     9.142     9.143
imax            9.887     9.883     9.882
excite_mean     0.461     0.461     0.461
fracstop        1.000     1.000     1.000
cjmean          2.959     2.959     2.959

libcent 0       179.9     179.0     179.7
libamp  0       108.6     108.6     108.5
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       160.0     159.5     159.0
kozaiamp        180.0     180.0     180.0