Orbit Fit and Astrometric record for 03QD91

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: 03QD91    
# Created Thu Oct 19 01:37:23 2017
# Orbit generated from Bernstein formalism
# Fitting   11 observations of   12
# Arc:  10.93y
# First observation: 2003/08/23
#  Last observation: 2014/07/29
Preliminary a, adot, b, bdot, g, gdot:
  -0.000240   0.024448   0.000003  -0.000258   0.024387   0.000000
# Chi-squared of fit:     6.17 DOF:   16 RMS:  0.13
# Min/Max residuals:    -0.32    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.501063E-05  2.403522E-02  6.208202E-07 -2.516643E-04  2.441370E-02  3.819215E-04
# Covariance matrix:
  3.2293E-13 -3.1112E-13 -1.8604E-15  2.8294E-15  7.3568E-14 -1.0085E-12
 -3.1112E-13  7.5426E-13  2.5460E-15 -7.3796E-15  1.3084E-13  2.6400E-12
 -1.8604E-15  2.5460E-15  1.8127E-13 -1.9359E-14 -3.4581E-15  8.2713E-15
  2.8294E-15 -7.3796E-15 -1.9359E-14  7.8752E-15 -1.5426E-15 -2.6146E-14
  7.3568E-14  1.3084E-13 -3.4581E-15 -1.5426E-15  5.8572E-13  5.6842E-13
 -1.0085E-12  2.6400E-12  8.2713E-15 -2.6146E-14  5.6842E-13  9.3568E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   -2.192207  -24.868296    0.100194   -0.038616   -1.009956  2452874.642723
# Heliocentric elements and errors
Epoch:              2452870.5000  =  2003/08/19
Mean Anomaly:           26.15086 +/-     0.194
Argument of Peri:      226.57384 +/-     0.208
Long of Asc Node:       80.80498 +/-     0.005
Inclination:             2.22360 +/-     0.000
Eccentricity:         0.02809636 +/-    0.0001
Semi-Major Axis:     43.04524281 +/-    0.0059
Time of Perihelion: 2445377.2601 +/-      55.6
Perihelion:          41.83582826 +/-    0.0082
Aphelion:            44.25465736 +/-    0.0085
Period (y)              282.4203 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           38.00771471 +/-    0.0012
Ecliptic Y          -17.72446319 +/-    0.0005
Ecliptic Z           -1.56680148 +/-    0.0001
Ecliptic XDOT         0.00116609 +/-    0.0000
Ecliptic YDOT         0.00242222 +/-    0.0000
Ecliptic ZDOT        -0.00002967 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.96662769 +/-    0.0011
Geocenter to KBO     40.96061498 +/-    0.0013
# Hcoef:  7.06

The following table shows the complete astrometric record for 03QD91. 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 (03QD91) followed by the observatory code and reference code for the source of the astrometry.

2003 08  23.14198  22 31 07.42   -11 40 07.2   22.2R 03QD91    807  Ci4137      
2003 08  23.21118  22 31 07.09   -11 40 09.3         03QD91    807  Ci4137      
2003 08  24.22582  22 31 02.48   -11 40 36.2         03QD91    807  Ci4137      
2003 10  01.39537  22 28 17.63   -11 56 04.0   23.5R 03QD91    568  Ci6964      
2003 10  02.41836  22 28 13.89   -11 56 23.6         03QD91    568  Ci6964      
2004 07  17.21052  22 38 43.24   -10 55 25.9   22.1R 03QD91    807  Cl8405      
2004 07  17.31127  22 38 42.94   -10 55 28.0         03QD91    807  Cl8405      
2004 10  10.18365  22 32 57.21   -11 29 33.8   23.0R 03QD91    695  Cl8405      
2004 10  10.31582  22 32 56.78   -11 29 36.5         03QD91    695  Cl8405      
2004 11  10.14711  22 31 53.01   -11 34 22.1   23.0R 03QD91    695  Cr8411      
2014 07  29.39522  23 29 04.47   -05 47 58.6   24.1R 03QD91    G37  C~16aI      
2014 07  29.44326  23 29 04.31   -05 47 59.6         03QD91    G37  C~16aI      

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     0.11       0.00    -0.16
  2   0.0002     -5.28    -0.12      -0.17    -0.32
  3   0.0030    -78.15    -0.01      -0.22     0.01
  4   0.1075  -2670.34    -0.16      25.88     0.03
  5   0.1103  -2728.60     0.17      27.74     0.14
  6   0.9009   7223.99    -0.11      -1.89     0.15
  7   0.9012   7219.10     0.10      -2.19     0.05
  8   1.1336   1733.23 (   0.22)     -7.09 (   0.47)
  9   1.1339   1726.36     0.09      -7.26    -0.04
 10   1.2184    749.89    -0.08      73.72     0.20
 11  10.9329  57078.41     0.15    -558.20    -0.08
 12  10.9331  57075.63    -0.15    -558.15     0.04

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.

03QD91    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.443    43.461    43.425
ecceobj         0.036     0.036     0.035
incobj          2.225     2.225     2.225
qmin           41.153    41.143    41.121
qmax           45.618    45.717    45.628
amean          43.304    43.322    43.285
amin           42.966    42.988    42.952
amax           43.638    43.668    43.632
emean           0.030     0.030     0.030
emin            0.010     0.011     0.010
emax            0.046     0.047     0.046
imean           0.831     0.827     0.835
imin            0.471     0.464     0.478
imax            1.136     1.131     1.143
excite_mean     0.034     0.034     0.034
fracstop        1.000     1.000     1.000
cjmean          3.092     3.092     3.092

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       177.6     178.5     177.3
kozaiamp        180.0     180.0     180.0