Orbit Fit and Astrometric record for 13UW18

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: 13UW18    
# Created Thu Feb 21 02:09:35 2019
# Orbit generated from Bernstein formalism
# Fitting   29 observations of   31
# Arc:   1.46y
# First observation: 2013/08/02
#  Last observation: 2015/01/17
Preliminary a, adot, b, bdot, g, gdot:
  -0.000091   0.028161  -0.000004  -0.003190   0.027274   0.000000
# Chi-squared of fit:     5.04 DOF:   52 RMS:  0.07
# Min/Max residuals:    -0.19    0.16
# Exact a, adot, b, bdot, g, gdot:
  1.610132E-05  2.782262E-02 -2.406151E-06 -3.158996E-03  2.702632E-02 -4.927182E-03
# Covariance matrix:
  3.4955E-13  1.1497E-13  1.5734E-14 -7.8549E-14  4.0108E-13  1.6656E-11
  1.1497E-13  4.1009E-13  1.6681E-14 -8.7072E-14  3.8470E-13  1.8554E-11
  1.5734E-14  1.6681E-14  1.1109E-13 -1.1319E-13  2.8032E-14  1.4681E-12
 -7.8549E-14 -8.7072E-14 -1.1319E-13  2.2488E-13 -1.4295E-13 -7.9891E-12
  4.0108E-13  3.8470E-13  2.8032E-14 -1.4295E-13  6.8249E-13  3.0384E-11
  1.6656E-11  1.8554E-11  1.4681E-12 -7.9891E-12  3.0384E-11  1.7098E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.775861   14.816186    0.919485   -0.013423   -0.433824  2456507.005448
# Heliocentric elements and errors
Epoch:              2456500.5000  =  2013/07/27
Mean Anomaly:          295.78859 +/-     0.101
Argument of Peri:      282.41937 +/-     0.029
Long of Asc Node:      178.47233 +/-     0.002
Inclination:             6.77658 +/-     0.001
Eccentricity:         0.20548267 +/-    0.0015
Semi-Major Axis:     39.46490552 +/-    0.0256
Time of Perihelion: 2472652.4404 +/-      20.1
Perihelion:          31.35555144 +/-    0.0626
Aphelion:            47.57425961 +/-    0.0667
Period (y)              247.9276 +/-      0.24
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           36.40806859 +/-    0.0011
Ecliptic Y            8.68246141 +/-    0.0003
Ecliptic Z           -1.14669199 +/-    0.0000
Ecliptic XDOT        -0.00121887 +/-    0.0000
Ecliptic YDOT         0.00259387 +/-    0.0000
Ecliptic ZDOT        -0.00030425 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.44659527 +/-    0.0011
Geocenter to KBO     37.00096498 +/-    0.0011
# Hcoef:  8.57

The following table shows the complete astrometric record for 13UW18. 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 (13UW18) followed by the observatory code and reference code for the source of the astrometry.

2013 08  02.50467  00 57 19.059  +04 11 59.92  24.4r 13UW18    568  C~2Yih      
2013 08  02.54741  00 57 18.990  +04 11 59.20  24.6r 13UW18    568  C~2Yih      
2013 08  11.50367  00 57 02.353  +04 09 33.90  24.3r 13UW18    568  C~2Yih      
2013 08  31.42413  00 56 02.060  +04 01 50.99  23.9r 13UW18    568  C~2Yih      
2013 08  31.46730  00 56 01.896  +04 01 49.75  24.1r 13UW18    568  C~2Yih      
2013 09  04.40430  00 55 46.690  +03 59 59.55  24.0r 13UW18    568  C~2Yih      
2013 09  04.44707  00 55 46.511  +03 59 58.45  24.2r 13UW18    568  C~2Yih      
2013 10  05.37632  00 53 23.791  +03 43 33.27  23.7r 13UW18    568  C~2Yih      
2013 10  06.37972  00 53 18.791  +03 42 59.80  23.9r 13UW18    568  C~2Yih      
2013 10  06.44410  00 53 18.455  +03 42 57.70  24.0r 13UW18    568  C~2Yih      
2013 10  09.50879  00 53 03.184  +03 41 16.05  23.7r 13UW18    568  C~2Yih      
2013 10  31.22708  00 51 19.232  +03 29 56.67  24.0r 13UW18    568  C~2Yih      
2013 10  31.27019  00 51 19.011  +03 29 55.23  24.3r 13UW18    568  C~2Yih      
2013 10  31.31297  00 51 18.805  +03 29 53.90  24.2r 13UW18    568  C~2Yih      
2013 11  01.25343  00 51 14.640  +03 29 27.30  23.9r 13UW18    568  C~2Yih      
2013 11  05.37780  00 50 56.844  +03 27 33.79  24.3r 13UW18    568  C~2Yih      
2013 11  06.34704  00 50 52.792  +03 27 07.89        13UW18    568  C~2Yih      
2013 11  06.39952  00 50 52.574  +03 27 06.77  24.5r 13UW18    568  C~2Yih      
2013 11  07.43574  00 50 48.293  +03 26 39.45  24.0r 13UW18    568  C~2Yih      
2013 12  05.31529  00 49 21.319  +03 17 44.13  24.4r 13UW18    568  C~2Yih      
2014 07  24.53752  01 03 39.901  +04 40 31.28  24.3r 13UW18    568  C~2Yih      
2014 07  27.56807  01 03 38.156  +04 40 04.44  24.4r 13UW18    568  C~2Yih      
2014 08  22.61348  01 02 48.580  +04 32 48.24  23.7r 13UW18    568  C~2Yih      
2014 08  28.45040  01 02 29.771  +04 30 25.76  24.3r 13UW18    568  C~2Yih      
2014 10  23.28767  00 58 13.401  +04 01 16.32  23.8r 13UW18    568  C~2Yih      
2014 10  27.25444  00 57 54.427  +03 59 14.71  24.2r 13UW18    568  C~2Yih      
2014 11  19.20738  00 56 18.596  +03 49 14.11  24.2r 13UW18    568  C~2Yih      
2014 11  19.27463  00 56 18.351  +03 49 12.73  24.0r 13UW18    568  C~2Yih      
2014 11  25.22391  00 55 58.950  +03 47 15.57  24.6r 13UW18    568  C~2Yih      
2014 12  17.32324  00 55 13.481  +03 42 58.52  24.4r 13UW18    568  C~2Yih      
2015 01  17.26407  00 55 31.392  +03 45 43.52  24.4r 13UW18    568  C~2Yih      

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     0.04       0.00     0.12
  2   0.0001     -1.23    -0.06      -0.27     0.02
  3   0.0246   -286.90 (   0.19)    -38.35 (   0.71)
  4   0.0792  -1297.76     0.09    -117.38    -0.01
  5   0.0793  -1300.50     0.08    -117.58    -0.07
  6   0.0901  -1552.95    -0.05    -131.41    -0.08
  7   0.0902  -1555.84    -0.08    -131.40     0.06
  8   0.1749  -3906.99     0.09    -214.86    -0.03
  9   0.1776  -3988.98     0.01    -216.79    -0.07
 10   0.1778  -3994.44    -0.11    -216.78     0.02
 11   0.1862  -4244.65    -0.11    -222.12     0.05
 12   0.2456  -5943.57 (   0.54)   -246.36 (  -0.01)
 13   0.2458  -5947.18     0.10    -246.41    -0.06
 14   0.2459  -5950.54    -0.10    -246.44    -0.09
 15   0.2485  -6018.39    -0.05    -246.82     0.04
 16   0.2597  -6308.27     0.06    -248.29     0.06
 17   0.2624  -6374.30    -0.01    -248.67    -0.06
 18   0.2625  -6377.74     0.16    -248.44     0.15
 19   0.2654  -6447.49     0.02    -248.80    -0.01
 20   0.3417  -7857.22    -0.08    -237.64     0.05
 21   0.9748   5917.23     0.00    -611.03     0.01
 22   0.9831   5882.81    -0.00    -625.81    -0.10
 23   1.0544   5030.34    -0.01    -744.16    -0.16
 24   1.0704   4715.76     0.03    -767.72    -0.01
 25   1.2232    502.13    -0.02    -907.26    -0.19
 26   1.2341    193.28    -0.05    -910.07     0.09
 27   1.2969  -1361.57     0.04    -911.15    -0.01
 28   1.2971  -1365.49    -0.00    -911.01     0.06
 29   1.3134  -1678.60     0.01    -907.04     0.10
 30   1.3739  -2405.73    -0.06    -881.43     0.09
 31   1.4586  -2094.67     0.05    -832.73     0.03

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.

13UW18    quality flag:3

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

axisobj        39.634    39.697    39.574
ecceobj         0.204     0.208     0.200
incobj          6.757     6.756     6.757
qmin           30.152    30.809    31.068
qmax           49.467    48.950    48.787
amean          39.457    39.457    39.458
amin           38.886    38.921    38.882
amax           40.090    40.071    40.105
emean           0.208     0.203     0.177
emin            0.176     0.185     0.142
emax            0.236     0.222     0.216
imean           6.951     7.338     9.590
imin            5.537     6.372     6.384
imax            8.800     8.015    11.705
excite_mean     0.242     0.240     0.245
fracstop        1.000     1.000     1.000
cjmean          2.985     2.986     2.984

libcent 0       179.8     180.8     181.2
libamp  0       134.3     127.8     143.2
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       168.6     188.0     200.3
kozaiamp         77.0     179.9     179.8