Orbit Fit and Astrometric record for 03QX91

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: 03QX91    
# Created Sun Dec  5 02:09:39 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     16 observations of     16
# Arc:  18.11y
# First observation: 2003/08/23
#  Last observation: 2021/10/03
# Chi-squared of fit:     8.37 DOF:     26 RMS:  0.13
# Min/Max residuals:    -0.30    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.715996E-05  3.356970E-02  9.383726E-06  1.744836E-02  3.114226E-02  2.772438E-03
# Covariance matrix:
  1.9319E-13 -4.0956E-14  2.0771E-14 -1.6349E-14 -3.5021E-15 -4.8311E-14
 -4.0956E-14  2.6362E-14 -1.6552E-14  1.2964E-14  1.7400E-14  3.8222E-14
  2.0771E-14 -1.6552E-14  1.6624E-13 -1.9472E-14 -3.3465E-15 -2.6230E-14
 -1.6349E-14  1.2964E-14 -1.9472E-14  8.6534E-15  1.0317E-15  2.0660E-14
 -3.5021E-15  1.7400E-14 -3.3465E-15  1.0317E-15  3.6360E-13  9.2352E-16
 -4.8311E-14  3.8222E-14 -2.6230E-14  2.0660E-14  9.2352E-16  6.1072E-14
#      lat0       lon0       xBary       yBary       zBary        JD0
   -4.126131  -15.275936    0.265467   -0.070483   -0.977779  2452874.747293
# Heliocentric elements and errors
Epoch:              2452874.5000  =  2003/08/23
Mean Anomaly:           11.36855 +/-     0.003
Argument of Peri:      332.07106 +/-     0.004
Long of Asc Node:      351.92023 +/-     0.000
Inclination:            27.73100 +/-     0.000
Eccentricity:         0.24730168 +/-    0.0001
Semi-Major Axis:     43.46671122 +/-    0.0048
Time of Perihelion: 2449569.0061 +/-       1.1
Perihelion:          32.71732039 +/-    0.0047
Aphelion:            54.21610206 +/-    0.0067
Period (y)              286.5783 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           31.76898521 +/-    0.0006
Ecliptic Y           -8.94842590 +/-    0.0002
Ecliptic Z           -2.31015407 +/-    0.0000
Ecliptic XDOT         0.00111328 +/-    0.0000
Ecliptic YDOT         0.00274814 +/-    0.0000
Ecliptic ZDOT         0.00151262 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   33.08590137 +/-    0.0006
Geocenter to KBO     32.11070128 +/-    0.0006
# Hcoef:  8.46

The following table shows the complete astrometric record for 03QX91. 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 (03QX91) followed by the observatory code and reference code for the source of the astrometry.

2003 08  23.24655  23 10 11.28   -09 49 10.2   22.5R 03QX91    807  Ci4137      
2003 08  24.27332  23 10 05.48   -09 49 37.5         03QX91    807  Ci4137      
2003 08  24.36527  23 10 04.95   -09 49 39.9         03QX91    807  Ci4137      
2003 10  23.12616  23 04 42.08   -10 10 16.6         03QX91    304  Ci9429      
2003 10  23.17031  23 04 41.92   -10 10 16.8         03QX91    304  Ci9429      
2004 08  13.18163  23 16 34.13   -08 05 16.9   22.6R 03QX91    807  Cr5111      
2004 08  13.28838  23 16 33.57   -08 05 19.7         03QX91    807  Cr5111      
2006 06  20.30997  23 29 47.08   -04 39 17.5   23.6R 03QX91    304  Cr5111      
2006 06  20.41475  23 29 47.10   -04 39 16.4         03QX91    304  Cr5111      
2006 07  28.34581  23 28 35.75   -04 41 41.3   23.9R 03QX91    304  Cr5531      
2006 07  28.38623  23 28 35.59   -04 41 41.9         03QX91    304  Cr5531      
2014 10  22.16373  00 02 56.42   +07 32 39.4   23.9R 03QX91    G37  C~1BxD      
2014 10  22.27064  00 02 55.87   +07 32 36.2         03QX91    G37  C~1BxD      
2021 10  03.275200 00 40 19.032  +17 57 35.02  24.3G 03QX91    G37  C~553k      
2021 10  03.311950 00 40 18.817  +17 57 34.03        03QX91    G37  C~553k      
2021 10  03.348600 00 40 18.616  +17 57 33.19        03QX91    G37  C~553k      

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    -0.11
     2   0.0028      0.00     0.00       0.00    -0.08
     3   0.0031      0.00    -0.01       0.00    -0.04
     4   0.1667      0.00    -0.13       0.00    -0.02
     5   0.1668      0.00     0.14       0.00     0.12
     6   0.9745      0.00     0.22       0.00     0.12
     7   0.9748      0.00     0.14       0.00    -0.08
     8   2.8256      0.00    -0.27       0.00    -0.08
     9   2.8259      0.00     0.02       0.00     0.14
    10   2.9298      0.00     0.09       0.00    -0.03
    11   2.9299      0.00    -0.01       0.00    -0.03
    12  11.1647      0.00    -0.08       0.00     0.28
    13  11.1650      0.00    -0.30       0.00     0.07
    14  18.1137      0.00     0.03       0.00    -0.06
    15  18.1138      0.00     0.01       0.00    -0.13
    16  18.1139      0.00     0.20       0.00    -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.

03QX91    quality flag:3

Type:         7:4EEE    7:4EEE    7:4EEE
Type:         7:4EII    7:4EII    7:4EII

axisobj        43.931    43.931    43.931
ecceobj         0.255     0.255     0.255
incobj         27.629    27.629    27.629
qmin           30.965    30.963    30.967
qmax           56.965    56.966    56.963
amean          43.724    43.724    43.724
amin           43.319    43.319    43.318
amax           44.210    44.210    44.210
emean           0.222     0.222     0.222
emin            0.131     0.131     0.131
emax            0.291     0.291     0.291
imean          28.856    28.856    28.857
imin           27.128    27.126    27.129
imax           30.872    30.872    30.872
excite_mean     0.534     0.534     0.534
fracstop        1.000     1.000     1.000
cjmean          2.742     2.742     2.742

libcent 0       178.7     178.6     178.8
libamp  0        85.4      85.3      85.5
libcent 1       178.0     178.0     178.0
libamp  1       111.3     111.3     111.3
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       205.1     205.1     205.0
kozaiamp        180.0     180.0     180.0