Orbit Fit and Astrometric record for 04FW164

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: 04FW164   
# Created Sat Dec  4 02:09:59 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     31 observations of     34
# Arc:  14.89y
# First observation: 2003/04/26
#  Last observation: 2018/03/17
# Chi-squared of fit:   407.65 DOF:     56 RMS:  0.64
# Min/Max residuals:    -1.73    0.98
# Exact a, adot, b, bdot, g, gdot:
 -1.510561E-06  3.573772E-02 -1.081853E-05  5.735205E-03  3.090280E-02 -7.033612E-04
# Covariance matrix:
  1.8900E-13 -5.7724E-14  1.3082E-14 -7.4665E-15  5.9385E-14 -7.4015E-14
 -5.7724E-14  2.9144E-14 -7.4414E-15  4.2579E-15 -2.7722E-14  4.2210E-14
  1.3082E-14 -7.4414E-15  1.0328E-13 -9.5553E-15  6.2788E-15 -1.1313E-14
 -7.4665E-15  4.2579E-15 -9.5553E-15  1.8868E-15 -3.2736E-15  6.4900E-15
  5.9385E-14 -2.7722E-14  6.2788E-15 -3.2736E-15  2.0667E-13 -3.2369E-14
 -7.4015E-14  4.2210E-14 -1.1313E-14  6.4900E-15 -3.2369E-14  6.4343E-14
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.266670 -164.236899   -0.346772   -0.004402   -0.945422  2452755.824823
# Heliocentric elements and errors
Epoch:              2452756.5000  =  2003/04/27
Mean Anomaly:          357.92909 +/-     0.002
Argument of Peri:        1.26273 +/-     0.003
Long of Asc Node:      197.96957 +/-     0.000
Inclination:             9.11767 +/-     0.000
Eccentricity:         0.16014838 +/-    0.0001
Semi-Major Axis:     39.65188337 +/-    0.0032
Time of Perihelion: 2453281.1303 +/-      10.9
Perihelion:          33.30169847 +/-    0.0035
Aphelion:            46.00206827 +/-    0.0043
Period (y)              249.6916 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -31.96006013 +/-    0.0005
Ecliptic Y           -9.37696680 +/-    0.0001
Ecliptic Z           -0.15094016 +/-    0.0000
Ecliptic XDOT         0.00091166 +/-    0.0000
Ecliptic YDOT        -0.00303577 +/-    0.0000
Ecliptic ZDOT         0.00050859 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   33.30759689 +/-    0.0004
Geocenter to KBO     32.35957714 +/-    0.0005
# Hcoef:  8.05

The following table shows the complete astrometric record for 04FW164. 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 (04FW164) followed by the observatory code and reference code for the source of the astrometry.

2003 04  26.32408  12 57 39.91   -06 26 58.6   22.7R 04FW164   568  Cq9909      
2003 04  26.36628  12 57 39.69   -06 26 57.1   22.6R 04FW164   568  Cq9909      
2003 04  26.40867  12 57 39.46   -06 26 55.6   22.5R 04FW164   568  Cq9909      
2004 03  20.57450  13 09 00.65   -07 17 45.3         04FW164   568  Cq9909      
2004 03  29.52259  13 08 13.60   -07 12 26.1   23.3R 04FW164   568  Cq9909      
2004 03  29.54560  13 08 13.43   -07 12 25.2   23.2R 04FW164   568  Cq9909      
2004 03  29.57409  13 08 13.29   -07 12 24.2   23.6R 04FW164   568  Cq9909      
2004 04  15.29003  13 06 42.28   -07 02 08.3         04FW164   675  Cq9909      
2004 04  15.33913  13 06 42.00   -07 02 06.2         04FW164   675  Cq9909      
2004 04  15.38135  13 06 41.76   -07 02 05.0         04FW164   675  Cq9909      
2004 04  16.24938  13 06 37.08   -07 01 32.4         04FW164   675  Cq9909      
2004 05  24.19250  13 03 43.16   -06 41 31.6         04FW164   695  Cq9909      
2004 05  24.24012  13 03 43.01   -06 41 30.8         04FW164   695  Cq9909      
2004 05  24.29308  13 03 42.83   -06 41 29.3         04FW164   695  Cq9909      
2005 07  08.28030  13 10 46.54   -07 01 35.5   22.9r 04FW164   568  Cq9909      
2005 08  01.97568  13 11 43.10   -07 06 17.5         04FW164   309  Cq9909      
2005 08  01.97898  13 11 43.12   -07 06 17.8         04FW164   309  Cq9909      
2005 08  01.98307  13 11 43.12   -07 06 17.8         04FW164   309  Cq9909      
2005 08  02.97488  13 11 46.72   -07 06 37.3         04FW164   309  Cq9909      
2005 08  02.97822  13 11 46.72   -07 06 37.8         04FW164   309  Cq9909      
2005 08  02.98225  13 11 46.73   -07 06 37.4         04FW164   309  Cq9909      
2013 03  13.40915  14 23 11.76   -11 09 39.9   23.2R 04FW164   G37  C~0qSW      
2013 03  13.46460  14 23 11.57   -11 09 38.6         04FW164   G37  C~0qSW      
2013 03  22.34052  14 22 37.08   -11 05 43.0   22.9R 04FW164   G37  C~0qSW      
2013 03  22.48717  14 22 36.47   -11 05 39.2         04FW164   G37  C~0qSW      
2013 03  24.31887  14 22 28.59   -11 04 46.7   22.8R 04FW164   G37  C~0qSW      
2013 03  24.39542  14 22 28.23   -11 04 45.0         04FW164   G37  C~0qSW      
2013 03  24.44799  14 22 27.99   -11 04 43.3         04FW164   G37  C~0qSW      
2018 03  17.50007  15 03 44.88   -12 45 15.7   23.6r 04FW164   568              
2018 03  17.56797  15 03 44.67   -12 45 14.3   23.7r 04FW164   568              
2018 03  17.63469  15 03 44.47   -12 45 12.9   23.0r 04FW164   568              
2019 05  06.310780 15 08 03.39   -12 40 25.9   23.1G 04FW164   705  C~39ne      
2019 05  06.344340 15 08 03.20   -12 40 24.9   22.8G 04FW164   705  C~39ne      
2019 05  06.379460 15 08 02.99   -12 40 24.0   23.0G 04FW164   705  C~39ne      

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 (   4.89)      0.00 (   1.04)
     2   0.0001      0.00 (   4.85)      0.00 (   1.07)
     3   0.0002      0.00 (   4.67)      0.00 (   1.08)
     4   0.9014      0.00    -1.73       0.00     0.26
     5   0.9259      0.00    -0.90       0.00    -0.15
     6   0.9260      0.00    -1.56       0.00    -0.09
     7   0.9261      0.00    -1.32       0.00    -0.13
     8   0.9718      0.00    -1.18       0.00    -0.65
     9   0.9720      0.00    -1.32       0.00    -0.35
    10   0.9721      0.00    -1.44       0.00    -0.70
    11   0.9745      0.00    -1.44       0.00     0.07
    12   1.0784      0.00    -0.77       0.00     0.28
    13   1.0785      0.00    -0.56       0.00    -0.06
    14   1.0786      0.00    -0.54       0.00     0.16
    15   2.2011      0.00    -0.43       0.00    -0.27
    16   2.2687      0.00    -0.74       0.00     0.01
    17   2.2687      0.00    -0.61       0.00    -0.23
    18   2.2687      0.00    -0.83       0.00    -0.15
    19   2.2715      0.00    -0.77       0.00    -0.28
    20   2.2715      0.00    -0.95       0.00    -0.71
    21   2.2715      0.00    -1.02       0.00    -0.23
    22   9.8811      0.00     0.72       0.00    -0.12
    23   9.8813      0.00     0.87       0.00    -0.21
    24   9.9056      0.00     0.59       0.00    -0.10
    25   9.9060      0.00     0.96       0.00    -0.41
    26   9.9110      0.00     0.98       0.00     0.28
    27   9.9112      0.00     0.71       0.00    -0.20
    28   9.9114      0.00     0.64       0.00    -0.00
    29  14.8917      0.00    -0.56       0.00     0.41
    30  14.8918      0.00    -0.60       0.00     0.33
    31  14.8920      0.00    -0.53       0.00     0.25
    32  16.0273      0.00    -0.70       0.00     0.24
    33  16.0274      0.00    -0.64       0.00     0.33
    34  16.0275      0.00    -0.75       0.00     0.28

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.

04FW164    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.254    39.254    39.254
ecceobj         0.152     0.152     0.152
incobj          9.148     9.148     9.148
qmin           32.622    32.619    32.624
qmax           46.846    46.847    46.846
amean          39.457    39.457    39.457
amin           39.050    39.052    39.046
amax           39.918    39.917    39.919
emean           0.153     0.153     0.153
emin            0.131     0.131     0.131
emax            0.174     0.174     0.174
imean          10.016    10.016    10.016
imin            9.267     9.267     9.267
imax           10.787    10.787    10.786
excite_mean     0.232     0.232     0.232
fracstop        1.000     1.000     1.000
cjmean          2.991     2.991     2.991

libcent 0       180.7     180.7     180.7
libamp  0        75.4      75.4      75.4
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       185.4     185.4     185.5
kozaiamp        180.0     180.0     180.0