Orbit Fit and Astrometric record for 13UF18

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: 13UF18    
# Created Mon Dec 18 02:37:58 2017
# Orbit generated from Bernstein formalism
# Fitting   35 observations of   36
# Arc:   2.05y
# First observation: 2013/08/02
#  Last observation: 2015/08/20
Preliminary a, adot, b, bdot, g, gdot:
  -0.000102   0.020161   0.000002  -0.003684   0.022168   0.000000
# Chi-squared of fit:    14.06 DOF:   64 RMS:  0.11
# Min/Max residuals:    -0.46    0.30
# Exact a, adot, b, bdot, g, gdot:
  1.456759E-05  1.992777E-02 -2.596738E-06 -3.646465E-03  2.200846E-02 -3.621788E-03
# Covariance matrix:
  2.0205E-13 -5.6137E-14  4.7250E-15 -1.9075E-14  1.3762E-13  3.1648E-12
 -5.6137E-14  2.4763E-13  8.8723E-15 -4.0078E-14  1.0402E-13  6.7050E-12
  4.7250E-15  8.8723E-15  1.0414E-13 -9.9035E-14  1.0620E-14  5.9766E-13
 -1.9075E-14 -4.0078E-14 -9.9035E-14  1.6273E-13 -4.5330E-14 -2.6847E-12
  1.3762E-13  1.0402E-13  1.0620E-14 -4.5330E-14  2.2026E-13  7.5528E-12
  3.1648E-12  6.7050E-12  5.9766E-13 -2.6847E-12  7.5528E-12  4.4897E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.834947   18.881971    0.947693   -0.005337   -0.368325  2456507.044298
# Heliocentric elements and errors
Epoch:              2456500.5000  =  2013/07/27
Mean Anomaly:          286.12193 +/-     0.110
Argument of Peri:      281.30565 +/-     0.032
Long of Asc Node:      193.20650 +/-     0.001
Inclination:            10.45250 +/-     0.001
Eccentricity:         0.19884136 +/-    0.0010
Semi-Major Axis:     46.58933869 +/-    0.0195
Time of Perihelion: 2480336.9343 +/-      32.1
Perihelion:          37.32545119 +/-    0.0501
Aphelion:            55.85322620 +/-    0.0531
Period (y)              318.0080 +/-      0.20
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           43.64237374 +/-    0.0009
Ecliptic Y           13.92841809 +/-    0.0003
Ecliptic Z           -0.66218913 +/-    0.0000
Ecliptic XDOT        -0.00124100 +/-    0.0000
Ecliptic YDOT         0.00219686 +/-    0.0000
Ecliptic ZDOT        -0.00044687 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.81589365 +/-    0.0009
Geocenter to KBO     45.43706864 +/-    0.0010
# Hcoef:  7.49

The following table shows the complete astrometric record for 13UF18. 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 (13UF18) followed by the observatory code and reference code for the source of the astrometry.

2013 08  02.54352  01 10 57.830  +06 37 24.74  24.0r 13UF18    568  C~2NKc      
2013 08  02.58624  01 10 57.788  +06 37 24.39  24.1r 13UF18    568  C~2NKc      
2013 08  31.46342  01 09 59.396  +06 29 54.59  24.0r 13UF18    568  C~2NKc      
2013 08  31.52899  01 09 59.191  +06 29 53.31  23.9r 13UF18    568  C~2NKc      
2013 09  04.44319  01 09 47.236  +06 28 28.15  23.8r 13UF18    568  C~2NKc      
2013 09  04.51807  01 09 46.965  +06 28 26.30  23.8r 13UF18    568  C~2NKc      
2013 10  06.42466  01 07 46.750  +06 14 44.33  23.7r 13UF18    568  C~2NKc      
2013 10  31.26631  01 06 05.380  +06 03 30.08  24.3r 13UF18    568  C~2NKc      
2013 10  31.30910  01 06 05.199  +06 03 28.98  24.0r 13UF18    568  C~2NKc      
2013 10  31.35182  01 06 05.036  +06 03 27.99  23.9r 13UF18    568  C~2NKc      
2013 11  01.29289  01 06 01.426  +06 03 03.88  23.7r 13UF18    568  C~2NKc      
2013 11  01.42381  01 06 00.902  +06 03 00.52  24.0r 13UF18    568  C~2NKc      
2013 11  05.47053  01 05 45.682  +06 01 20.31  24.0r 13UF18    568  C~2NKc      
2013 11  07.44359  01 05 38.489  +06 00 32.43  24.6r 13UF18    568  C~2NKc      
2013 11  07.45135  01 05 38.478  +06 00 32.32  24.0r 13UF18    568  C~2NKc      
2013 11  07.48378  01 05 38.347  +06 00 31.56  24.2r 13UF18    568  C~2NKc      
2013 12  04.28292  01 04 20.404  +05 51 54.68  24.5r 13UF18    568  C~2NKc      
2013 12  04.33509  01 04 20.286  +05 51 53.98  23.9r 13UF18    568  C~2NKc      
2013 12  05.26092  01 04 18.420  +05 51 41.38  24.4r 13UF18    568  C~2NKc      
2014 06  27.61338  01 15 14.186  +06 52 01.21  24.1r 13UF18    568  C~2NKc      
2014 06  29.58900  01 15 17.906  +06 52 16.41  23.8r 13UF18    568  C~2NKc      
2014 07  24.57652  01 15 38.394  +06 52 48.63  24.0r 13UF18    568  C~2NKc      
2014 07  27.60731  01 15 37.491  +06 52 32.08  24.2r 13UF18    568  C~2NKc      
2014 08  22.60340  01 15 00.988  +06 47 17.77  24.1r 13UF18    568  C~2NKc      
2014 08  23.57976  01 14 58.685  +06 47 00.37  24.1r 13UF18    568  C~2NKc      
2014 08  28.44260  01 14 46.291  +06 45 28.85  23.8r 13UF18    568  C~2NKc      
2014 08  30.50910  01 14 40.589  +06 44 47.00  24.4u 13UF18    568  C~2NKc      
2014 08  30.51339  01 14 40.560  +06 44 47.01  24.4u 13UF18    568  C~2NKc      
2014 10  23.34848  01 11 15.847  +06 21 38.41  24.3r 13UF18    568  C~2NKc      
2014 10  26.44393  01 11 03.267  +06 20 15.30  23.9r 13UF18    568  C~2NKc      
2014 10  27.38719  01 10 59.429  +06 19 50.44  23.6r 13UF18    568  C~2NKc      
2014 11  19.19777  01 09 36.348  +06 10 48.20  23.7r 13UF18    568  C~2NKc      
2014 11  19.26507  01 09 36.130  +06 10 46.88  24.1r 13UF18    568  C~2NKc      
2014 11  25.21441  01 09 18.484  +06 08 52.17  24.1r 13UF18    568  C~2NKd      
2015 01  18.22533  01 08 37.970  +06 04 06.02  23.9r 13UF18    568  C~2NKd      
2015 08  20.51903  01 19 45.407  +07 02 17.76  24.0r 13UF18    568  C~2NKd      

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    -0.05       0.00    -0.00
  2   0.0001     -0.71     0.02      -0.09     0.02
  3   0.0792   -976.43     0.07     -86.41    -0.06
  4   0.0794   -979.75     0.01     -86.44     0.07
  5   0.0901  -1176.92     0.00     -97.63    -0.12
  6   0.0903  -1181.36    -0.46     -97.81    -0.13
  7   0.1776  -3151.62    -0.00    -177.35     0.01
  8   0.2456  -4806.89     0.11    -225.30     0.01
  9   0.2458  -4809.80    -0.07    -225.28     0.07
 10   0.2459  -4812.43     0.04    -225.27     0.14
 11   0.2485  -4871.43     0.07    -227.04    -0.06
 12   0.2488  -4879.95    -0.12    -227.17    -0.03
 13   0.2599  -5128.18     0.00    -233.28     0.30
 14   0.2653  -5245.71    -0.07    -236.64    -0.03
 15   0.2653  -5245.90     0.20    -236.68    -0.06
 16   0.2654  -5248.00     0.04    -236.64     0.03
 17   0.3388  -6521.16     0.02    -270.78     0.01
 18   0.3389  -6523.05    -0.06    -270.75     0.07
 19   0.3415  -6553.63     0.14    -271.77     0.05
 20   0.9009   3867.24     0.13    -631.67    -0.02
 21   0.9064   3924.30     0.11    -638.47    -0.17
 22   0.9748   4219.18     0.01    -723.60    -0.04
 23   0.9831   4200.49     0.06    -733.87     0.04
 24   1.0542   3578.24    -0.00    -820.13     0.00
 25   1.0569   3539.90     0.02    -823.31    -0.07
 26   1.0702   3334.34     0.07    -838.47     0.04
 27   1.0759   3239.87     0.12    -845.19    -0.38
 28   1.0759   3239.47    -0.07    -845.02    -0.19
 29   1.2233   -109.99    -0.10    -977.53     0.21
 30   1.2318   -315.04 (   0.49)   -983.40 (  -0.29)
 31   1.2343   -377.42     0.06    -984.73    -0.00
 32   1.2968  -1729.37    -0.05   -1016.74    -0.01
 33   1.2970  -1732.87    -0.06   -1016.72     0.05
 34   1.3133  -2019.91    -0.08   -1022.97     0.14
 35   1.4611  -2687.67     0.01   -1058.20     0.05
 36   2.0478   7844.80    -0.08   -1578.59     0.07

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.

13UF18    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        46.807    46.860    46.756
ecceobj         0.196     0.199     0.194
incobj         10.420    10.420    10.420
qmin           36.613    36.486    36.664
qmax           56.761    56.974    56.654
amean          46.466    46.525    46.428
amin           46.031    46.117    46.034
amax           46.951    47.031    46.905
emean           0.195     0.198     0.193
emin            0.182     0.185     0.179
emax            0.211     0.213     0.208
imean          11.043    11.073    11.056
imin           10.418    10.418    10.417
imax           11.672    11.723    11.680
excite_mean     0.274     0.276     0.272
fracstop        1.000     1.000     1.000
cjmean          3.039     3.038     3.040

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       177.5     177.1     177.0
kozaiamp        180.0     180.0     179.9