Orbit Fit and Astrometric record for 69990

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: 69990     
# Created Tue Dec 12 02:36:30 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   23 observations of   24
# Arc:   6.79y
# First observation: 1998/11/18
#  Last observation: 2005/09/01
# Chi-squared of fit:    35.54 DOF:   40 RMS:  0.22
# Min/Max residuals:    -0.65    0.44
# Exact a, adot, b, bdot, g, gdot:
  1.845929E-05  3.719867E-02 -2.264291E-06 -4.250872E-03  3.158018E-02  2.955547E-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
    0.887310   49.477982   -0.112211    0.014905   -0.977956  2451135.641301
# Heliocentric elements and errors
Epoch:              2451136.5000  =  1998/11/19
Mean Anomaly:           20.56648 +/-     0.000
Argument of Peri:      141.93401 +/-     0.000
Long of Asc Node:      237.16016 +/-     0.000
Inclination:             6.56748 +/-     0.000
Eccentricity:         0.19314069 +/-    0.0000
Semi-Major Axis:     39.55610464 +/-    0.0000
Time of Perihelion: 2445945.1994 +/-       0.0
Perihelion:          31.91621113 +/-    0.0000
Aphelion:            47.19599816 +/-    0.0000
Period (y)              248.7875 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           21.12997145 +/-    0.0000
Ecliptic Y           24.88386994 +/-    0.0000
Ecliptic Z            0.49031600 +/-    0.0000
Ecliptic XDOT        -0.00228188 +/-    0.0000
Ecliptic YDOT         0.00230357 +/-    0.0000
Ecliptic ZDOT        -0.00036455 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   32.64842774 +/-    0.0000
Geocenter to KBO     31.66541458 +/-    0.0000
# Hcoef:  7.91

The following table shows the complete astrometric record for 69990. 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 (69990) followed by the observatory code and reference code for the source of the astrometry.

1998 11  18.14057  03 07 05.71   +18 27 14.7   23.0R 69990     695   a3608      
1998 11  18.20979  03 07 05.27   +18 27 13.0         69990     695   a3608      
1998 11  18.39543  03 07 04.13   +18 27 08.1         69990     695   a3608      
1998 12  18.00434  03 04 20.44   +18 14 29.6   23.2R 69990     950   a3608      
1998 12  18.04473  03 04 20.21   +18 14 28.7         69990     950   a3608      
1999 01  22.23449  03 02 42.55   +18 05 32.1   23.0R 69990     568  Ca5545      
1999 01  23.25650  03 02 41.89   +18 05 25.2         69990     568  Ca5545      
1999 10  06.56854  03 20 04.86   +19 04 06.5         69990     568  Ca6740      
1999 10  09.54166  03 19 51.25   +19 03 10.2         69990     568  Ca6740      
1999 10  09.57817  03 19 51.07   +19 03 09.6         69990     568  Ca6740      
1999 10  11.57167  03 19 41.51   +19 02 30.2   23.3R 69990     568  Ca6740      
1999 10  11.61914  03 19 41.27   +19 02 29.2   23.1R 69990     568  Ca6740      
2002 01  31.03554  03 28 43.00   +19 01 02.1   21.3  69990     304  Cf1458      
2002 01  31.06297  03 28 42.98   +19 01 02.0         69990     304  Cf1458      
2003 10  22.34087  03 54 06.32   +19 59 13.5   23.2R 69990     304  Ci9217      
2003 10  22.35028  03 54 06.27   +19 59 13.3         69990     304  Ci9217      
2003 10  23.24590  03 54 01.66   +19 58 57.1   23.1R 69990     304  Ci9217      
2003 10  23.29138  03 54 01.38   +19 58 56.0         69990     304  Ci9217      
2003 10  24.32014  03 53 56.09   +19 58 37.3   23.2R 69990     304  Ci9217      
2003 10  24.35301  03 53 55.90   +19 58 36.7         69990     304  Ci9217      
2005 09  01.36332  04 13 17.40   +20 26 48.1   22.8R 69990     250  S~06Fv      
2005 09  01.42759  04 13 17.46   +20 26 48.0         69990     250  S~06Fv      
2005 09  01.43431  04 13 17.46   +20 26 48.0         69990     250  S~06Fv      
2017 03  24.23316  05 32 13.579  +20 12 24.00        69990     568  C           

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     0.09       0.00     0.20
  2   0.0002      0.00    -0.05       0.00     0.24
  3   0.0007      0.00     0.22       0.00     0.44
  4   0.0818      0.00     0.18       0.00     0.00
  5   0.0819      0.00    -0.44       0.00     0.02
  6   0.1782      0.00    -0.03       0.00     0.16
  7   0.1810      0.00     0.10       0.00     0.14
  8   0.8828      0.00    -0.05       0.00    -0.00
  9   0.8909      0.00     0.26       0.00    -0.26
 10   0.8910      0.00     0.20       0.00    -0.14
 11   0.8965      0.00     0.03       0.00    -0.28
 12   0.8966      0.00    -0.03       0.00    -0.32
 13   3.2030      0.00     0.02       0.00     0.06
 14   3.2031      0.00    -0.08       0.00     0.08
 15   4.9259      0.00     0.30       0.00     0.10
 16   4.9260      0.00     0.28       0.00     0.07
 17   4.9284      0.00    -0.05       0.00     0.03
 18   4.9285      0.00    -0.65       0.00    -0.25
 19   4.9314      0.00     0.39       0.00    -0.15
 20   4.9315      0.00     0.17       0.00    -0.14
 21   6.7877      0.00     0.19       0.00     0.24
 22   6.7879      0.00     0.31       0.00     0.24
 23   6.7879      0.00     0.23       0.00     0.25
 24  18.3466      0.00 (   8.33)      0.00 (  -0.20)

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.

69990    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.631    39.631    39.631
ecceobj         0.194     0.194     0.194
incobj          6.559     6.559     6.559
qmin           31.388    31.388    31.388
qmax           48.140    48.150    48.146
amean          39.457    39.457    39.457
amin           38.970    38.970    38.973
amax           39.994    39.989    39.998
emean           0.187     0.187     0.187
emin            0.168     0.168     0.167
emax            0.205     0.205     0.205
imean           7.928     7.928     7.928
imin            7.321     7.321     7.320
imax            8.630     8.630     8.630
excite_mean     0.233     0.233     0.233
fracstop        1.000     1.000     1.000
cjmean          2.990     2.990     2.990

libcent 0       180.8     180.7     181.0
libamp  0       101.3     101.6     102.0
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       164.6     164.6     164.6
kozaiamp        180.0     180.0     180.0