Orbit Fit and Astrometric record for 99DA

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: 99DA      
# Created Mon Dec 10 02:07:38 2018
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   46 observations of   46
# Arc:  16.18y
# First observation: 1999/02/16
#  Last observation: 2015/04/24
# Chi-squared of fit:   195.96 DOF:   86 RMS:  0.36
# Min/Max residuals:    -0.75    0.81
# Exact a, adot, b, bdot, g, gdot:
  1.581104E-05  1.968149E-02 -8.367884E-07  6.992791E-05  2.207916E-02 -3.942131E-04
# Covariance matrix:
  9.9913E-14 -4.0231E-14  9.3990E-16 -1.8820E-17  1.0371E-13 -1.2478E-13
 -4.0231E-14  9.0845E-14  2.6116E-16  2.5132E-16  4.8933E-14  2.7486E-13
  9.3990E-16  2.6116E-16  4.6069E-14 -3.1497E-15  3.4992E-15  4.7741E-16
 -1.8820E-17  2.5132E-16 -3.1497E-15  6.7503E-16  4.0735E-16  7.4037E-16
  1.0371E-13  4.8933E-14  3.4992E-15  4.0735E-16  4.2354E-13  1.1148E-13
 -1.2478E-13  2.7486E-13  4.7741E-16  7.4037E-16  1.1148E-13  8.4144E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.844376  139.848876   -0.132000    0.048709   -0.984852  2451225.833693
# Heliocentric elements and errors
Epoch:              2451226.5000  =  1999/02/17
Mean Anomaly:          191.99001 +/-     0.042
Argument of Peri:      255.78860 +/-     0.033
Long of Asc Node:       53.85247 +/-     0.002
Inclination:             2.79039 +/-     0.000
Eccentricity:         0.07415265 +/-    0.0001
Semi-Major Axis:     43.13252336 +/-    0.0044
Time of Perihelion: 2499514.4002 +/-      14.8
Perihelion:          39.93413234 +/-    0.0053
Aphelion:            46.33091438 +/-    0.0058
Period (y)              283.2797 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.40679148 +/-    0.0010
Ecliptic Y           29.70279506 +/-    0.0009
Ecliptic Z            2.24748233 +/-    0.0001
Ecliptic XDOT        -0.00153778 +/-    0.0000
Ecliptic YDOT        -0.00188818 +/-    0.0000
Ecliptic ZDOT         0.00000624 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   46.27038946 +/-    0.0010
Geocenter to KBO     45.29162903 +/-    0.0013
# Hcoef:  7.80

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

1999 02  16.33295  09 32 47.65   +17 33 35.4   24.3R 99DA      568  Ca4507      
1999 02  16.37498  09 32 47.48   +17 33 36.0   24.1R 99DA      568  Ca4013      
1999 02  16.38828  09 32 47.40   +17 33 36.6         99DA      568  Ca4507      
1999 02  16.41302  09 32 47.31   +17 33 36.8   24.2R 99DA      568  Ca4013      
1999 02  16.42551  09 32 47.23   +17 33 37.1         99DA      568  Ca4013      
1999 02  16.42622  09 32 47.22   +17 33 37.4         99DA      568  Ca4507      
1999 02  16.45233  09 32 47.12   +17 33 37.7   24.1R 99DA      568  Ca4013      
1999 02  16.45887  09 32 47.08   +17 33 38.1         99DA      568  Ca4507      
1999 02  16.48792  09 32 46.95   +17 33 38.5   24.1R 99DA      568  Ca4013      
1999 02  17.31904  09 32 43.26   +17 33 56.3         99DA      568  Ca4013      
1999 02  17.35801  09 32 43.05   +17 33 56.8         99DA      568  Ca4013      
1999 02  17.39170  09 32 42.94   +17 33 57.5         99DA      568  Ca4013      
1999 02  17.40529  09 32 42.86   +17 33 58.2         99DA      568  Ca4013      
1999 03  23.25284  09 30 28.43   +17 43 45.4   24.0R 99DA      568  Ca4209      
1999 03  23.25958  09 30 28.39   +17 43 45.6         99DA      568  Ca4209      
1999 03  23.27248  09 30 28.35   +17 43 45.7         99DA      568  Ca4209      
1999 03  23.33771  09 30 28.16   +17 43 46.6         99DA      568  Ca4209      
1999 03  23.35067  09 30 28.11   +17 43 46.7         99DA      568  Ca4209      
1999 05  09.98889  09 29 21.33   +17 46 19.4   24.4R 99DA      807  Ca6741      
1999 05  10.99861  09 29 21.87   +17 46 12.8   24.5R 99DA      807  Ca6741      
2000 03  30.26309  09 34 32.69   +17 24 02.9         99DA      568  Cc6423      
2000 03  30.27631  09 34 32.66   +17 24 03.1         99DA      568  Cc6423      
2000 03  30.28290  09 34 32.67   +17 24 03.3         99DA      568  Cc6423      
2000 03  30.29589  09 34 32.64   +17 24 03.3         99DA      568  Cc6423      
2000 03  30.31016  09 34 32.59   +17 24 03.4         99DA      568  Cc6423      
2000 03  30.31661  09 34 32.55   +17 24 03.8         99DA      568  Cc6423      
2000 03  30.32306  09 34 32.54   +17 24 03.7         99DA      568  Cc6423      
2000 03  30.32958  09 34 32.52   +17 24 03.7   24.3R 99DA      568  Cc6423      
2000 03  30.33607  09 34 32.50   +17 24 03.7   24.1R 99DA      568  Cc6423      
2001 02  23.16458  09 41 11.76   +16 52 45.5   24.1R 99DA      309  Cc6423      
2001 02  23.17162  09 41 11.72   +16 52 45.9   23.9R 99DA      309  Cc6423      
2001 02  24.13751  09 41 07.49   +16 53 06.0         99DA      309  Cc6423      
2001 02  24.16626  09 41 07.37   +16 53 07.0   24. R 99DA      309  Cc7487      
2001 02  24.19459  09 41 07.26   +16 53 07.5         99DA      309  Cc7487      
2001 02  24.21656  09 41 07.14   +16 53 07.6         99DA      309  Cc6423      
2015 03  23.15082  10 40 38.95   +11 21 00.1   23.9R 99DA      695  C~1Q39      
2015 03  23.15697  10 40 38.90   +11 21 00.2         99DA      695  C~1Q39      
2015 03  23.21731  10 40 38.67   +11 21 01.7         99DA      695  C~1Q39      
2015 03  23.22247  10 40 38.64   +11 21 01.7         99DA      695  C~1Q39      
2015 03  23.27719  10 40 38.43   +11 21 03.0         99DA      695  C~1Q39      
2015 03  23.28187  10 40 38.41   +11 21 03.1         99DA      695  C~1Q39      
2015 04  15.19942  10 39 21.05   +11 27 45.2   24.0R 99DA      695  C~1RHL      
2015 04  15.27604  10 39 20.83   +11 27 46.5         99DA      695  C~1RHL      
2015 04  15.34908  10 39 20.64   +11 27 47.5         99DA      695  C~1RHL      
2015 04  24.18878  10 38 58.93   +11 29 27.4   23.9R 99DA      G37  C~1Re8      
2015 04  24.29550  10 38 58.71   +11 29 27.5         99DA      G37  C~1Re8      

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    -0.29       0.00     0.29
  2   0.0001      0.00     0.04       0.00    -0.01
  3   0.0002      0.00    -0.25       0.00     0.31
  4   0.0002      0.00     0.10       0.00    -0.02
  5   0.0003      0.00    -0.24       0.00     0.02
  6   0.0003      0.00    -0.34       0.00     0.30
  7   0.0003      0.00    -0.05       0.00     0.05
  8   0.0003      0.00    -0.20       0.00     0.31
  9   0.0004      0.00    -0.16       0.00     0.10
 10   0.0027      0.00     0.27       0.00     0.36
 11   0.0028      0.00    -0.22       0.00     0.03
 12   0.0029      0.00     0.44       0.00     0.02
 13   0.0029      0.00     0.17       0.00     0.43
 14   0.0956      0.00     0.67       0.00     0.02
 15   0.0956      0.00     0.40       0.00     0.14
 16   0.0957      0.00     0.43       0.00     0.08
 17   0.0958      0.00     0.76       0.00     0.16
 18   0.0959      0.00     0.65       0.00     0.10
 19   0.2263      0.00     0.71       0.00     0.62
 20   0.2291      0.00    -0.35       0.00     0.81
 21   1.1169      0.00    -0.75       0.00    -0.70
 22   1.1169      0.00    -0.64       0.00    -0.63
 23   1.1169      0.00    -0.21       0.00    -0.50
 24   1.1169      0.00    -0.11       0.00    -0.64
 25   1.1170      0.00    -0.26       0.00    -0.68
 26   1.1170      0.00    -0.58       0.00    -0.35
 27   1.1170      0.00    -0.46       0.00    -0.52
 28   1.1170      0.00    -0.49       0.00    -0.58
 29   1.1171      0.00    -0.51       0.00    -0.65
 30   2.0201      0.00     0.31       0.00    -0.11
 31   2.0201      0.00     0.18       0.00     0.14
 32   2.0227      0.00     0.14       0.00     0.05
 33   2.0228      0.00     0.26       0.00     0.45
 34   2.0229      0.00     0.50       0.00     0.36
 35   2.0230      0.00     0.16       0.00     0.00
 36  16.0953      0.00     0.26       0.00    -0.13
 37  16.0953      0.00    -0.12       0.00    -0.16
 38  16.0955      0.00     0.02       0.00     0.04
 39  16.0955      0.00    -0.12       0.00    -0.07
 40  16.0957      0.00    -0.01       0.00     0.06
 41  16.0957      0.00    -0.04       0.00     0.06
 42  16.1584      0.00     0.15       0.00    -0.20
 43  16.1586      0.00     0.09       0.00     0.09
 44  16.1588      0.00     0.30       0.00     0.14
 45  16.1830      0.00    -0.39       0.00     0.64
 46  16.1833      0.00    -0.16       0.00    -0.23

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.

99DA    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.239    43.239    43.239
ecceobj         0.071     0.071     0.071
incobj          2.790     2.790     2.790
qmin           39.564    39.564    39.563
qmax           47.409    47.407    47.410
amean          43.331    43.331    43.331
amin           42.980    42.983    42.979
amax           43.695    43.694    43.695
emean           0.066     0.066     0.066
emin            0.045     0.045     0.045
emax            0.085     0.085     0.085
imean           1.285     1.285     1.285
imin            0.125     0.125     0.125
imax            2.281     2.281     2.281
excite_mean     0.071     0.071     0.071
fracstop        1.000     1.000     1.000
cjmean          3.087     3.088     3.088

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       203.6     203.7     203.7
kozaiamp        180.0     180.0     180.0