Orbit Fit and Astrometric record for 99DL8

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: 99DL8     
# Created Fri Oct 20 01:37:03 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting    6 observations of    6
# Arc:  35.06d
# First observation: 1999/02/16
#  Last observation: 1999/03/23
# Chi-squared of fit:    34.24 DOF:    6 RMS:  0.42
# Min/Max residuals:    -0.54    0.77
# Exact a, adot, b, bdot, g, gdot:
  1.965910E-05  2.417079E-02  4.865995E-07  2.124499E-03  2.425624E-02  8.793326E-04
# Covariance matrix:
  1.4846E-11  1.5536E-08 -7.5332E-14  3.1228E-10  2.7332E-09 -3.4419E-09
  1.5536E-08  1.6694E-05 -8.0913E-11  3.3539E-07  2.9352E-06 -4.1158E-06
 -7.5332E-14 -8.0913E-11  3.7316E-13 -5.6018E-12 -1.4228E-11  1.9378E-11
  3.1228E-10  3.3539E-07 -5.6018E-12  6.8631E-09  5.8979E-08 -7.9100E-08
  2.7332E-09  2.9352E-06 -1.4228E-11  5.8979E-08  5.1619E-07 -6.8051E-07
 -3.4419E-09 -4.1158E-06  1.9378E-11 -7.9100E-08 -6.8051E-07  2.3353E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.572478  140.089492   -0.126826    0.044065   -0.985723  2451225.774693
# Heliocentric elements and errors
Epoch:              2451226.5000  =  1999/02/17
Mean Anomaly:           29.47844 +/-    26.248
Argument of Peri:      352.29406 +/-     7.375
Long of Asc Node:      113.74397 +/-     5.786
Inclination:             5.61477 +/-    23.674
Eccentricity:         0.07879013 +/-    0.0420
Semi-Major Axis:     45.23317070 +/-   25.5462
Time of Perihelion: 2442127.6606 +/-   11182.6
Perihelion:          41.66924314 +/-   23.6100
Aphelion:            48.79709827 +/-   27.6244
Period (y)              304.2242 +/-    257.72
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -32.42127740 +/-    1.2978
Ecliptic Y           26.95914750 +/-    1.0858
Ecliptic Z            1.85039392 +/-    0.0760
Ecliptic XDOT        -0.00181995 +/-    0.0006
Ecliptic YDOT        -0.00202696 +/-    0.0006
Ecliptic ZDOT         0.00024401 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.20611965 +/-    1.2143
Geocenter to KBO     41.22650274 +/-    1.6938
# Hcoef:  9.65

The following table shows the complete astrometric record for 99DL8. 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 (99DL8) followed by the observatory code and reference code for the source of the astrometry.

1999 02  16.27395  09 33 23.11   +17 13 31.6   25.6R 99DL8     568  Ca9922      
1999 02  16.38827  09 33 22.57   +17 13 34.3   25.4R 99DL8     568  Ca9922      
1999 02  17.27225  09 33 18.41   +17 13 54.8         99DL8     568  Ca9922      
1999 02  17.31905  09 33 18.17   +17 13 55.7         99DL8     568  Ca9922      
1999 03  23.25283  09 30 54.25   +17 25 13.5         99DL8     568  Ca9922      
1999 03  23.33770  09 30 53.94   +17 25 14.6         99DL8     568  Ca9922      

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    -0.14       0.00     0.61
  2   0.0003      0.00    -0.41       0.00     0.34
  3   0.0027      0.00     0.77       0.00    -0.31
  4   0.0029      0.00     0.58       0.00    -0.54
  5   0.0958      0.00     0.14       0.00     0.08
  6   0.0960      0.00    -0.11       0.00    -0.07

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.

99DL8    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.368    45.368    45.368
ecceobj         0.081     0.081     0.081
incobj          5.609     5.609     5.609
qmin           40.824    40.812    40.819
qmax           50.344    50.352    50.333
amean          45.454    45.454    45.454
amin           45.090    45.089    45.091
amax           45.848    45.845    45.849
emean           0.085     0.085     0.085
emin            0.071     0.071     0.071
emax            0.098     0.099     0.098
imean           4.091     4.091     4.091
imin            3.636     3.635     3.635
imax            4.591     4.592     4.591
excite_mean     0.111     0.111     0.111
fracstop        1.000     1.000     1.000
cjmean          3.104     3.104     3.104

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       169.9     169.9     169.9
kozaiamp        179.9     180.0     180.0