Orbit Fit and Astrometric record for 03QL91

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: 03QL91    
# Created Tue Dec 12 02:37:20 2017
# Orbit generated from Bernstein formalism
# Fitting   17 observations of   18
# Arc:  10.93y
# First observation: 2003/08/25
#  Last observation: 2014/07/29
Preliminary a, adot, b, bdot, g, gdot:
  -0.000254   0.023682   0.000010  -0.000618   0.023977   0.000000
# Chi-squared of fit:     6.19 DOF:   28 RMS:  0.11
# Min/Max residuals:    -0.27    0.31
# Exact a, adot, b, bdot, g, gdot:
  1.538692E-05  2.316434E-02  6.900412E-08 -6.053112E-04  2.399138E-02 -1.244961E-04
# Covariance matrix:
  2.7244E-13 -2.1628E-13 -2.0269E-15  4.7891E-15  1.4342E-13 -6.9047E-13
 -2.1628E-13  4.5048E-13  5.4064E-15 -1.1212E-14  4.5391E-14  1.6080E-12
 -2.0269E-15  5.4064E-15  1.1163E-13 -1.3485E-14  1.6360E-15  1.9913E-14
  4.7891E-15 -1.1212E-14 -1.3485E-14  7.4909E-15 -1.9786E-15 -4.0903E-14
  1.4342E-13  4.5391E-14  1.6360E-15 -1.9786E-15  4.0128E-13  2.7496E-13
 -6.9047E-13  1.6080E-12  1.9913E-14 -4.0903E-14  2.7496E-13  5.8636E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.363293  -28.731611   -0.003693    0.006491   -1.015129  2452876.730483
# Heliocentric elements and errors
Epoch:              2452870.5000  =  2003/08/19
Mean Anomaly:          298.29419 +/-     0.947
Argument of Peri:      229.03676 +/-     0.965
Long of Asc Node:      164.60058 +/-     0.002
Inclination:             1.53866 +/-     0.000
Eccentricity:         0.00672817 +/-    0.0001
Semi-Major Axis:     42.82772695 +/-    0.0049
Time of Perihelion: 2470417.7674 +/-     269.2
Perihelion:          42.53957468 +/-    0.0060
Aphelion:            43.11587923 +/-    0.0061
Period (y)              280.2823 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           37.43853464 +/-    0.0010
Ecliptic Y          -20.51683700 +/-    0.0005
Ecliptic Z            0.26427623 +/-    0.0000
Ecliptic XDOT         0.00125341 +/-    0.0000
Ecliptic YDOT         0.00231890 +/-    0.0000
Ecliptic ZDOT        -0.00006899 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.69255577 +/-    0.0009
Geocenter to KBO     41.68163823 +/-    0.0011
# Hcoef:  6.66

The following table shows the complete astrometric record for 03QL91. 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 (03QL91) followed by the observatory code and reference code for the source of the astrometry.

2003 08  25.22974  22 12 40.28   -10 41 02.6   21.9R 03QL91    807  Ci4137      
2003 08  26.21790  22 12 35.82   -10 41 27.5         03QL91    807  Ci4137      
2003 08  26.32469  22 12 35.34   -10 41 30.4         03QL91    807  Ci4137      
2003 09  28.21164  22 10 18.06   -10 54 34.0   22.8R 03QL91    688  Ci6257      
2003 09  28.33720  22 10 17.66   -10 54 36.3         03QL91    688  Ci6257      
2003 10  23.01618  22 09 09.21   -11 01 15.0   23.1R 03QL91    304  Ci9429      
2003 10  23.04322  22 09 09.16   -11 01 15.4         03QL91    304  Ci9429      
2003 10  23.14171  22 09 08.98   -11 01 16.8   22.6R 03QL91    695  Cj8802      
2003 10  24.17136  22 09 07.09   -11 01 28.0         03QL91    695  Cj8802      
2004 07  17.30741  22 20 20.98   -09 59 43.3         03QL91    807  C~0Col      
2004 08  12.28135  22 18 39.31   -10 09 26.7   22.0R 03QL91    807  Cl8405      
2004 08  12.35092  22 18 38.99   -10 09 28.3         03QL91    807  Cl8405      
2004 10  10.16522  22 14 40.60   -10 32 27.5   22.9R 03QL91    695  Cl8405      
2004 10  10.29698  22 14 40.21   -10 32 29.7         03QL91    695  Cl8405      
2004 11  10.14154  22 13 48.85   -10 37 42.8   23.0R 03QL91    695  Cl9847      
2004 11  11.11617  22 13 48.55   -10 37 45.3         03QL91    695  Cl9847      
2014 07  29.38518  23 09 43.45   -05 24 53.7   22.9R 03QL91    G37  C~16aI      
2014 07  29.43316  23 09 43.29   -05 24 54.6         03QL91    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    -0.02       0.00    -0.10
  2   0.0027    -70.30    -0.00       0.05     0.31
  3   0.0030    -77.94     0.05      -0.15     0.10
  4   0.0930  -2247.16    -0.04     -16.91     0.17
  5   0.0934  -2253.49 (   0.82)    -16.98 (   0.12)
  6   0.1609  -3337.54     0.03     -34.54     0.10
  7   0.1610  -3338.37     0.03     -34.66    -0.00
  8   0.1613  -3341.34     0.04     -35.03    -0.11
  9   0.1641  -3371.34    -0.08     -35.71     0.01
 10   0.8955   7238.23    -0.07    -117.28    -0.27
 11   0.9666   5625.78     0.09    -121.05    -0.17
 12   0.9668   5620.79    -0.03    -120.84     0.02
 13   1.1278   1841.18     0.08    -149.60    -0.17
 14   1.1282   1835.02     0.04    -149.61    -0.14
 15   1.2126   1015.84    -0.05    -172.47     0.09
 16   1.2153   1010.82    -0.07    -173.24     0.11
 17  10.9272  55513.41     0.03   -1394.32    -0.03
 18  10.9273  55510.67    -0.03   -1394.22     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.

03QL91    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.203    43.218    43.188
ecceobj         0.014     0.014     0.014
incobj          1.533     1.533     1.533
qmin           41.402    41.369    41.357
qmax           44.931    44.951    44.949
amean          43.087    43.101    43.072
amin           42.761    42.770    42.742
amax           43.416    43.441    43.406
emean           0.020     0.020     0.020
emin            0.000     0.000     0.001
emax            0.035     0.035     0.036
imean           2.463     2.454     2.472
imin            1.467     1.467     1.466
imax            3.169     3.160     3.180
excite_mean     0.048     0.047     0.048
fracstop        1.000     1.000     1.000
cjmean          3.088     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       187.7     186.8     188.7
kozaiamp        180.0     180.0     180.0