Orbit Fit and Astrometric record for 438028

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: 438028    
# Created Mon Dec 18 02:36:46 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   30 observations of   30
# Arc:  14.97y
# First observation: 2000/05/04
#  Last observation: 2015/04/22
# Chi-squared of fit:   171.35 DOF:   54 RMS:  0.42
# Min/Max residuals:    -1.68    1.50
# Exact a, adot, b, bdot, g, gdot:
  2.042892E-05  4.793870E-02  1.054952E-06  1.417276E-03  3.595159E-02 -7.777900E-04
# Covariance matrix:
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
#      lat0       lon0       xBary       yBary       zBary        JD0
   -2.641868  168.888602   -0.832759   -0.027021   -0.580757  2451668.739545
# Heliocentric elements and errors
Epoch:              2451668.5000  =  2000/05/04
Mean Anomaly:            2.15452 +/-     0.000
Argument of Peri:      300.53630 +/-     0.000
Long of Asc Node:      226.02038 +/-     0.000
Inclination:             3.13974 +/-     0.000
Eccentricity:         0.27743186 +/-    0.0000
Semi-Major Axis:     39.28723586 +/-    0.0000
Time of Perihelion: 2451130.1998 +/-       0.0
Perihelion:          28.38770492 +/-    0.0000
Aphelion:            50.18676681 +/-    0.0000
Period (y)              246.2552 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -27.98943607 +/-    0.0000
Ecliptic Y            4.65275686 +/-    0.0000
Ecliptic Z           -1.28202375 +/-    0.0000
Ecliptic XDOT        -0.00065683 +/-    0.0000
Ecliptic YDOT        -0.00358628 +/-    0.0000
Ecliptic ZDOT         0.00011068 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   28.40246055 +/-    0.0000
Geocenter to KBO     27.81522888 +/-    0.0000
# Hcoef:  8.00

The following table shows the complete astrometric record for 438028. 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 (438028) followed by the observatory code and reference code for the source of the astrometry.

2000 05  04.238802 11 15 00.20   +01 57 53.7   21.8V 438028    645  C~2KNU      
2000 05  04.239631 11 15 00.18   +01 57 53.8   21.3V 438028    645  C~2KNU      
2000 05  04.242119 11 15 00.20   +01 57 53.8   22.8V 438028    645  C~2KNU      
2004 03  15.28675  12 00 27.99   -02 33 49.5   22.0R 438028    695  Ck9976      
2004 03  16.25231  12 00 22.02   -02 33 10.1         438028    695  Ck9976      
2004 03  16.30835  12 00 21.67   -02 33 07.9         438028    695  Ck9976      
2004 04  21.37348  11 56 51.17   -02 08 56.0   22.2R 438028    568  Ck9976      
2004 04  21.40905  11 56 50.99   -02 08 54.6         438028    568  Ck9976      
2004 04  22.33222  11 56 46.45   -02 08 21.5         438028    568  Ck9976      
2004 05  07.34612  11 55 42.67   -02 00 18.3   22.9R 438028    568  Ck9976      
2004 05  07.35867  11 55 42.63   -02 00 18.2         438028    568  Ck9976      
2004 05  07.40171  11 55 42.47   -02 00 16.7         438028    568  Ck9976      
2004 05  08.37861  11 55 39.07   -01 59 49.6   22.8R 438028    568  Ck9976      
2004 07  15.97823  11 56 20.96   -01 57 36.8   20.9R 438028    807  Cl0712      
2004 07  16.02467  11 56 21.17   -01 57 37.9         438028    807  Cl0712      
2005 02  09.42608  12 13 45.51   -03 52 19.0   22.8R 438028    688  Cq6071      
2005 02  09.50277  12 13 45.15   -03 52 17.7         438028    688  Cq6071      
2006 02  25.39460  12 22 42.60   -04 43 18.5   23.0R 438028    688  Cq6071      
2006 02  25.51254  12 22 42.00   -04 43 14.7         438028    688  Cq6071      
2007 02  15.43006  12 33 36.91   -05 45 25.1   22.4R 438028    688  Cu2342      
2007 02  15.50448  12 33 36.64   -05 45 24.7         438028    688  Cu2342      
2009 03  24.29504  12 50 28.67   -07 16 56.7   22.4R 438028    688  C~05Wr      
2009 03  24.34358  12 50 28.32   -07 16 54.5         438028    688  C~05Wr      
2009 04  27.16960  12 47 05.69   -06 54 43.4   22.8R 438028    688  C~06fy      
2009 04  27.25545  12 47 05.18   -06 54 39.8         438028    688  C~06fy      
2014 05  30.20627  13 33 38.82   -10 54 29.0   22.7R 438028    695  C~1LJI      
2014 05  30.30727  13 33 38.39   -10 54 26.2         438028    695  C~1LJI      
2015 04  18.35058  13 47 07.69   -12 04 11.7         438028    W84  C~1Tih      
2015 04  21.33855  13 46 49.31   -12 02 25.3   23.4V 438028    W84  C~1Tih      
2015 04  22.33797  13 46 43.18   -12 01 49.7         438028    W84  C~1Tih      

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     1.50
  2   0.0000      0.00    -0.14       0.00    -0.07
  3   0.0000      0.00     0.26       0.00    -0.13
  4   3.8632      0.00     0.04       0.00     0.16
  5   3.8659      0.00     0.07       0.00     0.23
  6   3.8660      0.00     0.11       0.00     0.14
  7   3.9648      0.00     0.11       0.00    -0.04
  8   3.9649      0.00     0.12       0.00     0.07
  9   3.9674      0.00     0.12       0.00    -0.08
 10   4.0085      0.00     0.06       0.00     0.11
 11   4.0085      0.00     0.15       0.00    -0.14
 12   4.0087      0.00     0.10       0.00     0.15
 13   4.0113      0.00     0.22       0.00     0.12
 14   4.1991      0.00    -0.05       0.00    -0.03
 15   4.1993      0.00    -0.13       0.00     0.03
 16   4.7698      0.00    -0.25       0.00     0.63
 17   4.7701      0.00    -0.87       0.00     0.11
 18   5.8129      0.00    -0.45       0.00     0.27
 19   5.8132      0.00    -0.17       0.00     0.31
 20   6.7849      0.00     0.52       0.00    -0.30
 21   6.7851      0.00     1.11       0.00    -1.68
 22   8.8872      0.00     0.67       0.00    -0.69
 23   8.8874      0.00    -0.09       0.00    -0.35
 24   8.9800      0.00    -0.05       0.00    -0.06
 25   8.9802      0.00    -0.52       0.00     0.34
 26  14.0697      0.00     0.10       0.00     0.23
 27  14.0700      0.00    -0.16       0.00     0.39
 28  14.9544      0.00     0.00       0.00     0.03
 29  14.9626      0.00     0.06       0.00    -0.05
 30  14.9654      0.00     0.23       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.

438028    quality flag:3

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

axisobj        39.244    39.244    39.244
ecceobj         0.277     0.277     0.277
incobj          3.139     3.139     3.139
qmin           27.835    27.835    27.834
qmax           51.889    51.888    51.890
amean          39.455    39.455    39.455
amin           38.966    38.965    38.975
amax           40.063    40.063    40.063
emean           0.279     0.279     0.280
emin            0.264     0.264     0.264
emax            0.295     0.295     0.295
imean           4.595     4.593     4.591
imin            4.117     4.117     4.117
imax            5.181     5.179     5.182
excite_mean     0.291     0.291     0.291
fracstop        1.000     1.000     1.000
cjmean          2.954     2.954     2.954

libcent 0       179.9     180.1     180.5
libamp  0        96.2      96.3      96.7
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       185.6     185.7     185.0
kozaiamp        180.0     180.0     180.0