Orbit Fit and Astrometric record for 99DH8

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: 99DH8     
# Created Tue Oct 24 01:37:01 2017
# Orbit generated from Bernstein formalism
# Fitting    9 observations of   11
# Arc:   2.02y
# First observation: 1999/02/16
#  Last observation: 2001/02/24
Preliminary a, adot, b, bdot, g, gdot:
   0.000002   0.023492  -0.000002   0.001534   0.024276   0.000000
# Chi-squared of fit:     3.49 DOF:   12 RMS:  0.11
# Min/Max residuals:    -0.19    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.516556E-05  2.342631E-02  2.621847E-07  1.530559E-03  2.404185E-02 -1.229490E-03
# Covariance matrix:
  5.8719E-13  1.7010E-11 -5.4599E-14  1.0881E-12  2.3854E-11  3.5446E-10
  1.7010E-11  1.3799E-09 -4.4557E-12  8.7389E-11  1.8911E-09  2.8481E-08
 -5.4599E-14 -4.4557E-12  3.5403E-13 -4.7301E-13 -6.0994E-12 -9.1998E-11
  1.0881E-12  8.7389E-11 -4.7301E-13  5.7416E-12  1.1977E-10  1.8040E-09
  2.3854E-11  1.8911E-09 -6.0994E-12  1.1977E-10  2.5944E-09  3.9033E-08
  3.5446E-10  2.8481E-08 -9.1998E-11  1.8040E-09  3.9033E-08  5.8795E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.639645  139.596897   -0.135304    0.045169   -0.984545  2451225.774703
# Heliocentric elements and errors
Epoch:              2451220.5000  =  1999/02/11
Mean Anomaly:          302.13875 +/-     9.990
Argument of Peri:       97.95047 +/-    12.996
Long of Asc Node:      105.14226 +/-     0.019
Inclination:             4.53175 +/-     0.002
Eccentricity:         0.05368622 +/-    0.0317
Semi-Major Axis:     43.72794076 +/-    0.3855
Time of Perihelion: 2468195.9871 +/-    2922.4
Perihelion:          41.38035272 +/-    1.4328
Aphelion:            46.07552879 +/-    1.4438
Period (y)              289.1657 +/-      3.82
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -32.47081708 +/-    0.0670
Ecliptic Y           27.46652299 +/-    0.0571
Ecliptic Z            1.91559563 +/-    0.0041
Ecliptic XDOT        -0.00161827 +/-    0.0001
Ecliptic YDOT        -0.00211836 +/-    0.0001
Ecliptic ZDOT         0.00016767 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.57268318 +/-    0.0630
Geocenter to KBO     41.59414377 +/-    0.0881
# Hcoef:  8.66

The following table shows the complete astrometric record for 99DH8. 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 (99DH8) followed by the observatory code and reference code for the source of the astrometry.

1999 02  16.27396  09 31 31.21   +17 26 45.0   24.5R 99DH8     568  Ca5550      
1999 02  16.37499  09 31 30.72   +17 26 47.3   24.5R 99DH8     568  Ca5550      
1999 02  17.27226  09 31 26.41   +17 27 08.1   25.0V 99DH8     568  Ca5550      
1999 02  17.42688  09 31 25.66   +17 27 11.7         99DH8     568  Ca5550      
1999 05  09.98889  09 27 56.09   +17 41 14.5   24.5R 99DH8     807  Ca6741      
1999 05  10.99861  09 27 56.89   +17 41 08.1   25.3R 99DH8     807  Ca6741      
2000 03  30.26309  09 34 03.58   +17 19 17.8         99DH8     568  Cc7487      
2000 03  30.30371  09 34 03.47   +17 19 18.3   24.6R 99DH8     568  Cc7487      
2001 02  23.24056  09 41 48.76   +16 47 23.8   24.5R 99DH8     309  Cc7487      
2001 02  24.11954  09 41 44.66   +16 47 44.1   24.4R 99DH8     309  Cc7487      
2001 02  24.15440  09 41 44.52   +16 47 44.9   24.6R 99DH8     309  Cc7487      

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     0.05       0.00     0.15
  2   0.0003     -7.38     0.10      -0.05     0.08
  3   0.0027    -72.47    -0.09       0.10    -0.09
  4   0.0032    -83.79    -0.06       0.11    -0.10
  5   0.2265  -3193.81 (   3.28)   -144.76 (   1.48)
  6   0.2292  -3180.95 (   3.29)   -147.26 (   1.92)
  7   1.1170   2209.92    -0.07     272.16    -0.08
  8   1.1171   2208.27     0.07     272.13    -0.01
  9   2.0204   9146.39    -0.19     633.14     0.06
 10   2.0228   9083.99    -0.08     632.87    -0.06
 11   2.0229   9081.83     0.27     632.96     0.05

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.

99DH8    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.849    45.514    43.148
ecceobj         0.054     0.154     0.056
incobj          4.528     4.523     4.533
qmin           40.774    37.961    39.264
qmax           47.321    53.754    47.409
amean          43.957    45.668    43.225
amin           43.618    45.289    42.886
amax           44.322    46.127    43.583
emean           0.053     0.152     0.068
emin            0.037     0.137     0.046
emax            0.068     0.166     0.088
imean           2.867     2.722     3.130
imin            2.211     1.895     2.057
imax            3.532     3.459     4.251
excite_mean     0.073     0.159     0.088
fracstop        1.000     1.000     1.000
cjmean          3.095     3.091     3.083

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       182.9     185.9     175.5
kozaiamp        179.9     179.9     180.0