Orbit Fit and Astrometric record for 03QG91

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: 03QG91    
# Created Sun Dec  5 02:09:37 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     18 observations of     18
# Arc:  18.05y
# First observation: 2003/08/24
#  Last observation: 2021/09/12
# Chi-squared of fit:   110.13 DOF:     30 RMS:  0.44
# Min/Max residuals:    -0.97    0.64
# Exact a, adot, b, bdot, g, gdot:
  1.565313E-05  2.343038E-02 -1.510220E-06  1.349532E-04  2.418696E-02 -6.007329E-04
# Covariance matrix:
  2.2781E-13 -4.9070E-14  1.4269E-15 -2.4357E-16 -6.5145E-14 -7.9820E-14
 -4.9070E-14  3.1436E-14 -8.4318E-18  1.8132E-16 -1.0979E-14  6.7736E-14
  1.4269E-15 -8.4318E-18  1.4048E-13 -1.0380E-14 -3.0431E-15  3.0690E-16
 -2.4357E-16  1.8132E-16 -1.0380E-14  1.7671E-15 -5.1751E-17  4.1229E-16
 -6.5145E-14 -1.0979E-14 -3.0431E-15 -5.1751E-17  1.7502E-13 -4.3368E-14
 -7.9820E-14  6.7736E-14  3.0690E-16  4.1229E-16 -4.3368E-14  1.5660E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -2.228799  -50.339795   -0.358016   -0.036912   -0.949500  2452875.513503
# Heliocentric elements and errors
Epoch:              2452876.5000  =  2003/08/25
Mean Anomaly:          271.50850 +/-     0.179
Argument of Peri:        9.67961 +/-     0.190
Long of Asc Node:       30.88358 +/-     0.003
Inclination:             2.20775 +/-     0.000
Eccentricity:         0.01682665 +/-    0.0000
Semi-Major Axis:     42.29776498 +/-    0.0030
Time of Perihelion: 2477575.1737 +/-      50.7
Perihelion:          41.58603541 +/-    0.0031
Aphelion:            43.00949455 +/-    0.0032
Period (y)              275.0960 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           27.24729322 +/-    0.0005
Ecliptic Y          -32.30374659 +/-    0.0005
Ecliptic Z           -1.60795900 +/-    0.0000
Ecliptic XDOT         0.00199354 +/-    0.0000
Ecliptic YDOT         0.00173886 +/-    0.0000
Ecliptic ZDOT         0.00001808 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.29105650 +/-    0.0005
Geocenter to KBO     41.34464491 +/-    0.0007
# Hcoef:  7.37

The following table shows the complete astrometric record for 03QG91. 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 (03QG91) followed by the observatory code and reference code for the source of the astrometry.

2003 08  24.01276  20 50 56.04   -19 58 44.3   22.7R 03QG91    807  Ci4137      
2003 08  24.11630  20 50 55.56   -19 58 46.2         03QG91    807  Ci4137      
2003 08  25.02086  20 50 51.49   -19 59 01.1         03QG91    807  Ci4137      
2003 10  23.09315  20 48 18.64   -20 06 26.9   23.2R 03QG91    695  Cj4699      
2003 10  24.09751  20 48 18.63   -20 06 22.7         03QG91    695  Cj4699      
2004 07  16.11984  20 59 25.47   -19 23 56.9   22.8R 03QG91    807  Cr3580      
2004 07  16.22312  20 59 25.04   -19 23 59.3         03QG91    807  Cr3580      
2006 04  27.34719  21 12 32.85   -18 23 03.5   23.5R 03QG91    807  Cr3580      
2006 04  28.36019  21 12 34.58   -18 22 58.1         03QG91    807  Cr3580      
2007 05  14.84962  21 18 07.35   -17 58 12.0   24.1R 03QG91    250  S~06Ad      
2007 05  14.85656  21 18 07.35   -17 58 12.0         03QG91    250  S~06Ad      
2007 05  14.86350  21 18 07.36   -17 58 12.0         03QG91    250  S~06Ad      
2007 05  14.87045  21 18 07.36   -17 58 12.0         03QG91    250  S~06Ad      
2013 10  06.18169  21 41 59.28   -15 59 24.0   23.3R 03QG91    695  C~0zdV      
2013 10  07.15894  21 41 56.69   -15 59 34.2         03QG91    695  C~0zdV      
2021 09  12.166530 22 25 01.821  -11 56 09.53  23.9G 03QG91    G37  C~553k      
2021 09  12.222160 22 25 01.508  -11 56 11.06        03QG91    G37  C~553k      
2021 09  12.281130 22 25 01.303  -11 56 12.54        03QG91    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    -0.17       0.00     0.30
     2   0.0003      0.00    -0.24       0.00     0.13
     3   0.0028      0.00    -0.32       0.00     0.08
     4   0.1645      0.00     0.37       0.00    -0.48
     5   0.1672      0.00     0.59       0.00     0.41
     6   0.8956      0.00    -0.70       0.00     0.46
     7   0.8959      0.00     0.00       0.00     0.12
     8   2.6758      0.00    -0.23       0.00    -0.07
     9   2.6786      0.00    -0.97       0.00     0.60
    10   3.7230      0.00     0.55       0.00    -0.53
    11   3.7230      0.00     0.52       0.00    -0.52
    12   3.7231      0.00     0.64       0.00    -0.51
    13   3.7231      0.00     0.61       0.00    -0.49
    14  10.1196      0.00    -0.32       0.00     0.30
    15  10.1222      0.00    -0.30       0.00     0.37
    16  18.0538      0.00     0.37       0.00     0.13
    17  18.0540      0.00    -0.60       0.00    -0.06
    18  18.0541      0.00     0.28       0.00    -0.12

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.

03QG91    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        42.562    42.562    42.562
ecceobj         0.021     0.021     0.021
incobj          2.206     2.206     2.206
qmin           40.261    40.266    40.259
qmax           45.035    45.026    45.042
amean          42.564    42.564    42.565
amin           42.244    42.245    42.241
amax           42.898    42.896    42.906
emean           0.030     0.029     0.030
emin            0.006     0.006     0.006
emax            0.050     0.050     0.050
imean           1.822     1.822     1.822
imin            0.313     0.313     0.313
imax            2.684     2.684     2.684
excite_mean     0.046     0.046     0.046
fracstop        1.000     1.000     1.000
cjmean          3.082     3.082     3.082

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       178.0     177.9     178.0
kozaiamp        179.9     179.9     180.0