Orbit Fit and Astrometric record for 03QU90

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: 03QU90    
# Created Tue Oct 17 01:37:23 2017
# Orbit generated from Bernstein formalism
# Fitting    9 observations of    9
# Arc:   0.97y
# First observation: 2003/08/23
#  Last observation: 2004/08/12
Preliminary a, adot, b, bdot, g, gdot:
  -0.000011   0.022878   0.000000  -0.000166   0.023587   0.000000
# Chi-squared of fit:     7.32 DOF:   12 RMS:  0.16
# Min/Max residuals:    -0.27    0.40
# Exact a, adot, b, bdot, g, gdot:
  1.647806E-05  2.287311E-02 -4.854444E-08 -1.660005E-04  2.378785E-02  1.381606E-03
# Covariance matrix:
  5.2083E-13  4.4268E-12  1.0518E-14 -4.1865E-14  2.0866E-12  2.0314E-10
  4.4268E-12  6.7003E-10  9.8056E-13 -5.3197E-12  2.0798E-10  2.7093E-08
  1.0518E-14  9.8056E-13  2.5565E-13 -3.2983E-13  3.1421E-13  3.9883E-11
 -4.1865E-14 -5.3197E-12 -3.2983E-13  1.1994E-12 -1.6648E-12 -2.1567E-10
  2.0866E-12  2.0798E-10  3.1421E-13 -1.6648E-12  6.6265E-11  8.4525E-09
  2.0314E-10  2.7093E-08  3.9883E-11 -2.1567E-10  8.4525E-09  1.0979E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.820609  -28.347151    0.037554    0.032295   -1.014427  2452874.708073
# Heliocentric elements and errors
Epoch:              2452870.5000  =  2003/08/19
Mean Anomaly:           80.69695 +/-     3.879
Argument of Peri:       15.44013 +/-     0.763
Long of Asc Node:      228.68308 +/-     0.102
Inclination:             1.82402 +/-     0.001
Eccentricity:         0.05924507 +/-    0.0461
Semi-Major Axis:     43.31283708 +/-    0.2808
Time of Perihelion: 2429531.7271 +/-    1098.8
Perihelion:          40.74676518 +/-    2.0133
Aphelion:            45.87890897 +/-    2.0179
Period (y)              285.0579 +/-      2.77
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           37.85157709 +/-    0.0126
Ecliptic Y          -20.46094014 +/-    0.0068
Ecliptic Z            1.33555443 +/-    0.0005
Ecliptic XDOT         0.00138512 +/-    0.0001
Ecliptic YDOT         0.00223542 +/-    0.0001
Ecliptic ZDOT        -0.00001387 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.04852686 +/-    0.0116
Geocenter to KBO     42.03826706 +/-    0.0144
# Hcoef:  7.15

The following table shows the complete astrometric record for 03QU90. 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 (03QU90) followed by the observatory code and reference code for the source of the astrometry.

2003 08  23.20733  22 12 01.87   -09 11 06.6   22.5R 03QU90    807  Ci4137      
2003 08  24.10783  22 11 57.89   -09 11 29.0         03QU90    807  Ci4137      
2003 08  24.20369  22 11 57.46   -09 11 31.7         03QU90    807  Ci4137      
2003 10  01.37300  22 09 21.51   -09 26 41.3   23.8R 03QU90    568  Ci6964      
2003 10  02.36925  22 09 18.21   -09 27 02.1         03QU90    568  Ci6964      
2003 10  24.11947  22 08 22.53   -09 33 00.4   23.4R 03QU90    695  Cj4699      
2003 10  24.24205  22 08 22.31   -09 33 01.6         03QU90    695  Cj4699      
2004 08  12.27681  22 17 43.638  -08 39 32.84  22.9R 03QU90    807              
2004 08  12.34629  22 17 43.351  -08 39 34.49        03QU90    807              

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    -0.26       0.00    -0.01
  2   0.0025    -63.05     0.16      -0.05     0.02
  3   0.0027    -69.96     0.12      -0.31    -0.27
  4   0.1072  -2550.98     0.07     -34.58     0.40
  5   0.1100  -2604.01    -0.11     -36.82    -0.13
  6   0.1695  -3501.38    -0.07     -81.74    -0.11
  7   0.1698  -3504.85     0.08     -81.72     0.15
  8   0.9721   5408.07    -0.12     -35.84     0.02
  9   0.9723   5403.51     0.12     -35.86    -0.06

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.

03QU90    quality flag:2

Type:      CLASSICAL  SCATNEAR CLASSICAL

axisobj        43.684    45.406    43.451
ecceobj         0.058     0.196     0.012
incobj          1.823     1.822     1.824
qmin           40.361    35.600    41.807
qmax           47.031    55.486    45.007
amean          43.576    45.296    43.331
amin           43.243    44.854    42.998
amax           43.936    45.791    43.667
emean           0.053     0.191     0.016
emin            0.035     0.169     0.000
emax            0.070     0.212     0.031
imean           3.576     4.470     3.503
imin            2.791     2.962     2.695
imax            4.313     6.180     4.233
excite_mean     0.082     0.207     0.063
fracstop        1.000     1.000     1.000
cjmean          3.088     3.064     3.089

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       172.8     174.0     186.8
kozaiamp        180.0     180.0     180.0