Orbit Fit and Astrometric record for 12DW98

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: 12DW98    
# Created Thu Oct 19 01:38:09 2017
# Orbit generated from Bernstein formalism
# Fitting   43 observations of   43
# Arc:  11.11y
# First observation: 2004/02/17
#  Last observation: 2015/03/29
Preliminary a, adot, b, bdot, g, gdot:
  -0.000798   0.025456  -0.000254   0.007796   0.027118   0.000000
# Chi-squared of fit:    19.75 DOF:   80 RMS:  0.12
# Min/Max residuals:    -0.30    0.29
# Exact a, adot, b, bdot, g, gdot:
  1.566385E-05  2.476268E-02  5.501315E-06  7.623843E-03  2.561369E-02  5.955431E-07
# Covariance matrix:
  4.7374E-13 -1.0376E-13  3.5005E-14 -2.0123E-14 -5.7377E-14 -2.1831E-13
 -1.0376E-13  4.7013E-14 -2.2120E-14  1.2849E-14  5.3898E-14  1.3970E-13
  3.5005E-14 -2.2120E-14  3.8044E-13 -4.5770E-14 -2.3010E-14 -7.3797E-14
 -2.0123E-14  1.2849E-14 -4.5770E-14  8.4472E-15  1.4196E-14  4.2689E-14
 -5.7377E-14  5.3898E-14 -2.3010E-14  1.4196E-14  1.6600E-13  1.5622E-13
 -2.1831E-13  1.3970E-13 -7.3797E-14  4.2689E-14  1.5622E-13  4.6373E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -8.884703 -175.805415    0.582880   -0.122285   -0.782873  2453052.737743
# Heliocentric elements and errors
Epoch:              2453050.5000  =  2004/02/15
Mean Anomaly:          343.32070 +/-     0.035
Argument of Peri:      350.31628 +/-     0.037
Long of Asc Node:      209.73934 +/-     0.000
Inclination:            19.00706 +/-     0.000
Eccentricity:         0.03893048 +/-    0.0000
Semi-Major Axis:     41.36973466 +/-    0.0024
Time of Perihelion: 2457553.4570 +/-       9.3
Perihelion:          39.75919113 +/-    0.0028
Aphelion:            42.98027818 +/-    0.0030
Period (y)              266.0923 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -39.30632394 +/-    0.0006
Ecliptic Y           -2.29611081 +/-    0.0001
Ecliptic Z           -6.02966059 +/-    0.0001
Ecliptic XDOT         0.00006425 +/-    0.0000
Ecliptic YDOT        -0.00265564 +/-    0.0000
Ecliptic ZDOT         0.00080527 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.83234908 +/-    0.0006
Geocenter to KBO     39.04162262 +/-    0.0006
# Hcoef:  6.00

The following table shows the complete astrometric record for 12DW98. 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 (12DW98) followed by the observatory code and reference code for the source of the astrometry.

2004 02  17.23700  12 01 07.93   -09 48 49.9   20.9R 12DW98    I03  C~1vWc      
2004 02  17.28255  12 01 07.76   -09 48 48.9   20.7R 12DW98    I03  C~1vWc      
2004 02  17.32726  12 01 07.60   -09 48 48.0   20.9R 12DW98    I03  C~1vWc      
2011 04  03.43425  12 40 03.084  -10 30 34.24  22.1w 12DW98    F51  C~1vWc      
2011 04  03.44813  12 40 03.022  -10 30 33.81  21.8w 12DW98    F51  C~1vWc      
2011 04  03.46395  12 40 02.946  -10 30 33.19  22.0w 12DW98    F51  C~1vWc      
2011 04  03.47786  12 40 02.876  -10 30 32.65  21.8w 12DW98    F51  C~1vWc      
2011 04  28.34775  12 38 11.392  -10 15 55.08  22.0w 12DW98    F51  C~1vWc      
2011 04  28.36199  12 38 11.336  -10 15 54.68  22.1w 12DW98    F51  C~1vWc      
2011 04  28.37606  12 38 11.269  -10 15 54.20  22.1w 12DW98    F51  C~1vWc      
2012 02  27.47396  12 48 41.026  -10 55 14.84  22.0w 12DW98    F51  C~1vWc      
2012 02  27.48873  12 48 40.968  -10 55 14.39  22.2w 12DW98    F51  C~1vWc      
2012 02  27.50353  12 48 40.925  -10 55 14.12  21.9w 12DW98    F51  C~1vWc      
2012 02  27.51830  12 48 40.870  -10 55 13.84  22.1w 12DW98    F51  C~1vWc      
2012 03  16.50016  12 47 26.825  -10 47 19.47  21.5r 12DW98    F51  C~1vWc      
2012 03  16.52443  12 47 26.724  -10 47 18.69  21.6i 12DW98    F51  C~1vWc      
2012 03  16.53719  12 47 26.670  -10 47 18.39  21.4i 12DW98    F51  C~1vWc      
2012 04  14.33972  12 45 12.486  -10 31 15.82  21.9w 12DW98    F51  C~1vWc      
2012 04  14.35458  12 45 12.412  -10 31 15.20  21.9w 12DW98    F51  C~1vWc      
2012 04  14.36943  12 45 12.352  -10 31 14.71  21.9w 12DW98    F51  C~1vWc      
2013 03  05.51736  12 54 18.321  -10 59 24.90  21.5r 12DW98    F51  C~1vWc      
2013 03  05.52845  12 54 18.278  -10 59 24.45  21.8r 12DW98    F51  C~1vWc      
2013 03  05.55246  12 54 18.169  -10 59 23.93  21.5i 12DW98    F51  C~1vWc      
2014 04  05.38364  12 58 06.432  -10 50 31.92  21.9w 12DW98    F51  C~1vWc      
2014 04  05.39485  12 58 06.400  -10 50 31.57  21.8w 12DW98    F51  C~1vWc      
2014 04  05.40607  12 58 06.344  -10 50 31.15  21.9w 12DW98    F51  C~1vWc      
2014 04  05.41730  12 58 06.289  -10 50 30.70  21.9w 12DW98    F51  C~1vWc      
2014 05  25.28650  12 54 44.434  -10 23 19.63  21.9w 12DW98    F51  C~1vWc      
2014 05  25.29859  12 54 44.393  -10 23 19.31  22.0w 12DW98    F51  C~1vWc      
2014 05  25.31069  12 54 44.355  -10 23 19.07  22.0w 12DW98    F51  C~1vWc      
2014 05  25.32277  12 54 44.323  -10 23 18.70  22.1w 12DW98    F51  C~1vWc      
2014 06  02.27092  12 54 24.985  -10 19 55.53  22.3w 12DW98    F51  C~1vWc      
2014 06  02.28304  12 54 24.958  -10 19 54.78  22.3w 12DW98    F51  C~1vWc      
2014 06  02.29513  12 54 24.941  -10 19 54.78  22.4w 12DW98    F51  C~1vWc      
2014 06  02.30724  12 54 24.913  -10 19 54.51  22.1w 12DW98    F51  C~1vWc      
2015 01  24.60311  13 08 00.007  -11 21 10.79  22.2w 12DW98    F51  C~1vWc      
2015 01  24.61533  13 08 00.008  -11 21 10.50  22.1w 12DW98    F51  C~1vWc      
2015 01  24.62749  13 07 59.985  -11 21 10.49  22.1w 12DW98    F51  C~1vWc      
2015 01  24.63970  13 07 59.985  -11 21 10.59  22.2w 12DW98    F51  C~1vWc      
2015 03  29.48685  13 04 46.114  -11 00 44.02  21.3i 12DW98    F51  C~1vWc      
2015 03  29.49904  13 04 46.047  -11 00 43.84  21.4i 12DW98    F51  C~1vWc      
2015 03  29.51094  13 04 45.999  -11 00 43.33  21.3i 12DW98    F51  C~1vWc      
2015 03  29.52286  13 04 45.939  -11 00 42.87  21.4i 12DW98    F51  C~1vWc      

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    -0.08       0.00    -0.16
  2   0.0001     -2.70    -0.02      -0.10    -0.04
  3   0.0002     -5.23     0.16      -0.22     0.04
  4   7.1244  33045.31    -0.14   11208.51    -0.06
  5   7.1245  33044.28    -0.05   11208.56    -0.08
  6   7.1245  33042.97    -0.08   11208.71    -0.02
  7   7.1245  33041.78    -0.14   11208.83     0.02
  8   7.1926  31140.89     0.06   11398.98     0.09
  9   7.1927  31139.95     0.15   11399.03     0.02
 10   7.1927  31138.83     0.03   11399.10    -0.04
 11   8.0280  40949.65    -0.09   12738.32     0.02
 12   8.0281  40948.65    -0.17   12738.42     0.12
 13   8.0281  40947.93     0.03   12738.43     0.13
 14   8.0281  40947.04     0.06   12738.39     0.09
 15   8.0774  39710.73     0.04   12770.92    -0.03
 16   8.0774  39708.99     0.16   12771.09     0.07
 17   8.0775  39708.11     0.26   12771.07     0.01
 18   8.1563  37434.25    -0.06   12923.54    -0.00
 19   8.1564  37432.96    -0.16   12923.71     0.06
 20   8.1564  37431.93    -0.01   12923.83     0.09
 21   9.0466  45894.22     0.10   14397.70    -0.06
 22   9.0467  45893.43     0.06   14397.89     0.12
 23   9.0467  45891.66    -0.08   14397.77    -0.03
 24  10.1304  49010.65    -0.24   16191.86     0.10
 25  10.1305  49010.05     0.09   16192.01     0.20
 26  10.1305  49009.08     0.05   16192.10     0.23
 27  10.1305  49008.11     0.01   16192.22     0.29
 28  10.2671  45460.12     0.05   16615.23     0.04
 29  10.2671  45459.41    -0.05   16615.30    -0.01
 30  10.2671  45458.77    -0.07   16615.32    -0.12
 31  10.2672  45458.16    -0.05   16615.49    -0.07
 32  10.2889  45101.68    -0.03   16700.12    -0.27
 33  10.2890  45101.00    -0.21   16700.68     0.17
 34  10.2890  45100.76     0.04   16700.59    -0.05
 35  10.2890  45100.25     0.03   16700.69    -0.08
 36  10.9360  58472.87    -0.05   17745.49    -0.30
 37  10.9360  58472.78    -0.02   17745.78     0.01
 38  10.9360  58472.43    -0.25   17745.66    -0.09
 39  10.9361  58472.47    -0.09   17745.56    -0.17
 40  11.1109  55125.15     0.20   17850.39     0.04
 41  11.1109  55124.09     0.14   17850.19    -0.22
 42  11.1109  55123.19     0.22   17850.42    -0.05
 43  11.1110  55122.13     0.14   17850.52     0.01

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.

12DW98    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        40.937    40.944    40.931
ecceobj         0.029     0.030     0.029
incobj         19.082    19.082    19.082
qmin           38.894    38.851    38.976
qmax           43.561    43.666    43.472
amean          41.144    41.150    41.139
amin           40.819    40.835    40.816
amax           41.471    41.469    41.460
emean           0.031     0.029     0.032
emin            0.014     0.010     0.018
emax            0.051     0.054     0.049
imean          19.846    19.838    19.847
imin           19.339    19.324    19.317
imax           20.392    20.384    20.393
excite_mean     0.341     0.341     0.341
fracstop        1.000     1.000     1.000
cjmean          2.930     2.930     2.930

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       175.4     174.0     180.1
kozaiamp        180.0     180.0     179.9