Orbit Fit and Astrometric record for 181902

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: 181902    
# Created Mon Dec 11 02:36:41 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   23 observations of   23
# Arc:   8.03y
# First observation: 1999/09/06
#  Last observation: 2007/09/17
# Chi-squared of fit:    44.40 DOF:   40 RMS:  0.25
# Min/Max residuals:    -1.14    0.47
# Exact a, adot, b, bdot, g, gdot:
  1.803587E-05  3.112354E-02 -7.775601E-06 -1.429335E-02  2.644958E-02  5.585561E-03
# 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
    9.035707   12.394894    0.486808    0.137188   -0.864085  2451428.060963
# Heliocentric elements and errors
Epoch:              2451428.5000  =  1999/09/07
Mean Anomaly:            2.66483 +/-     0.000
Argument of Peri:      138.40925 +/-     0.000
Long of Asc Node:      210.35187 +/-     0.000
Inclination:            25.86612 +/-     0.000
Eccentricity:         0.70215814 +/-    0.0000
Semi-Major Axis:    126.32170821 +/-    0.0000
Time of Perihelion: 2447589.8172 +/-       0.0
Perihelion:          37.62389274 +/-    0.0000
Aphelion:           215.01952369 +/-    0.0000
Period (y)             1419.7935 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           37.43490256 +/-    0.0000
Ecliptic Y            7.72955268 +/-    0.0000
Ecliptic Z            5.93742398 +/-    0.0000
Ecliptic XDOT         0.00008904 +/-    0.0000
Ecliptic YDOT         0.00332733 +/-    0.0000
Ecliptic ZDOT        -0.00137031 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.68283618 +/-    0.0000
Geocenter to KBO     37.80768888 +/-    0.0000
# Hcoef:  7.25

The following table shows the complete astrometric record for 181902. 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 (181902) followed by the observatory code and reference code for the source of the astrometry.

1999 09  06.56022  00 31 10.48   +13 12 13.2   23.0R 181902    568  Ca8546      
1999 09  06.59742  00 31 10.32   +13 12 12.2   22.9R 181902    568  Ca8546      
1999 09  06.62994  00 31 10.18   +13 12 11.6   22.9R 181902    568  Ca8546      
1999 09  10.54671  00 30 54.09   +13 10 22.2   23.4R 181902    568  Ca8546      
1999 09  10.55715  00 30 54.06   +13 10 21.8   23.2R 181902    568  Ca8546      
1999 10  08.50808  00 28 49.02   +12 54 17.2   23.2R 181902    568  Ca8546      
1999 10  08.53390  00 28 48.93   +12 54 16.3   23.1R 181902    568  Ca8546      
1999 11  10.37659  00 26 37.82   +12 32 30.8   23.1R 181902    568  Ca8546      
1999 11  10.41134  00 26 37.70   +12 32 29.3   23.0R 181902    568  Ca8546      
2000 08  28.41863  00 39 43.41   +13 12 54.5   23.0R 181902    568  Cb9109      
2000 08  28.45126  00 39 43.30   +13 12 53.7         181902    568  Cb9109      
2000 08  29.57009  00 39 39.36   +13 12 29.0   22.9R 181902    568  Cb9109      
2000 12  27.23400  00 33 36.217  +12 07 49.99  22.5R 181902    568  Cl2513      
2000 12  28.24333  00 33 37.226  +12 07 34.10  22.3R 181902    568  Cl2513      
2003 11  22.11659  00 57 26.48   +12 12 45.4   23.0R 181902    695  Cj3572      
2003 11  22.17613  00 57 26.32   +12 12 43.6         181902    695  Cj3572      
2007 09  11.40438  01 31 59.48   +12 26 05.3   22.5r 181902    695  Cv8413      
2007 09  11.45410  01 31 59.32   +12 26 04.3   22.1r 181902    695  Cv8413      
2007 09  17.33490  01 31 38.54   +12 23 30.4         181902    675  Cy6666      
2007 09  17.34721  01 31 38.49   +12 23 30.0         181902    675  Cy6666      
2007 09  17.37645  01 31 38.38   +12 23 29.1         181902    675  Cy6666      
2007 09  17.38199  01 31 38.34   +12 23 29.1         181902    675  Cy6666      
2007 09  17.38906  01 31 38.34   +12 23 28.8         181902    675  Cy6666      

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    -0.16       0.00    -1.14
  2   0.0001      0.00     0.11       0.00    -0.07
  3   0.0002      0.00     0.01       0.00     0.21
  4   0.0109      0.00    -0.16       0.00     0.08
  5   0.0109      0.00     0.06       0.00    -0.01
  6   0.0875      0.00     0.04       0.00    -0.02
  7   0.0875      0.00     0.47       0.00     0.09
  8   0.1775      0.00    -0.09       0.00     0.30
  9   0.1776      0.00    -0.21       0.00     0.14
 10   0.9770      0.00     0.06       0.00    -0.24
 11   0.9771      0.00     0.15       0.00    -0.34
 12   0.9802      0.00     0.08       0.00    -0.34
 13   1.3078      0.00    -0.22       0.00     0.05
 14   1.3106      0.00    -0.27       0.00     0.12
 15   4.2096      0.00    -0.02       0.00     0.22
 16   4.2098      0.00     0.24       0.00     0.37
 17   8.0133      0.00    -0.14       0.00    -0.13
 18   8.0134      0.00     0.03       0.00     0.12
 19   8.0295      0.00     0.16       0.00     0.07
 20   8.0295      0.00     0.10       0.00     0.00
 21   8.0296      0.00     0.11       0.00    -0.10
 22   8.0296      0.00    -0.18       0.00     0.05
 23   8.0296      0.00     0.22       0.00    -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.

181902    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj       125.974   125.975   125.973
ecceobj         0.701     0.701     0.701
incobj         25.867    25.867    25.867
qmin           35.912    36.032    36.279
qmax          216.655   216.639   216.656
amean         122.789   122.987   122.911
amin          120.113   120.416   120.190
amax          126.835   127.111   127.120
emean           0.691     0.691     0.690
emin            0.679     0.678     0.678
emax            0.708     0.707     0.705
imean          26.715    26.822    26.894
imin           25.332    25.444    25.734
imax           27.719    27.734    27.725
excite_mean     0.824     0.825     0.825
fracstop        1.000     1.000     1.000
cjmean          2.853     2.853     2.854

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       197.2     194.5     194.5
kozaiamp         58.8      56.8      55.2