Orbit Fit and Astrometric record for 13UD18

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: 13UD18    
# Created Sat Dec 16 02:37:58 2017
# Orbit generated from Bernstein formalism
# Fitting   49 observations of   49
# Arc:   2.35y
# First observation: 2013/08/02
#  Last observation: 2015/12/07
Preliminary a, adot, b, bdot, g, gdot:
  -0.000128   0.023302  -0.000002   0.000665   0.023674   0.000000
# Chi-squared of fit:    20.11 DOF:   92 RMS:  0.11
# Min/Max residuals:    -0.33    0.30
# Exact a, adot, b, bdot, g, gdot:
  1.566747E-05  2.308078E-02  8.255654E-07  6.596740E-04  2.354720E-02 -1.506094E-03
# Covariance matrix:
  1.4519E-13 -1.1600E-14  1.0312E-15  1.6315E-15  1.0596E-13  2.1009E-12
 -1.1600E-14  1.7858E-13  1.2333E-16  4.5235E-15  1.0767E-13  5.2402E-12
  1.0312E-15  1.2333E-16  7.1957E-14 -6.0543E-14  1.1423E-15 -6.7622E-15
  1.6315E-15  4.5235E-15 -6.0543E-14  8.6407E-14  4.4808E-15  2.6741E-13
  1.0596E-13  1.0767E-13  1.1423E-15  4.4808E-15  1.7605E-13  5.4088E-12
  2.1009E-12  5.2402E-12 -6.7622E-15  2.6741E-13  5.4088E-12  3.0678E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -2.230850   18.292145    0.943877   -0.014685   -0.377753  2456507.040418
# Heliocentric elements and errors
Epoch:              2456500.5000  =  2013/07/27
Mean Anomaly:          304.16504 +/-     0.116
Argument of Peri:       11.87227 +/-     0.192
Long of Asc Node:       71.29434 +/-     0.012
Inclination:             2.72264 +/-     0.000
Eccentricity:         0.10195425 +/-    0.0007
Semi-Major Axis:     45.09119845 +/-    0.0068
Time of Perihelion: 2473653.4900 +/-      35.5
Perihelion:          40.49395896 +/-    0.0328
Aphelion:            49.68843795 +/-    0.0331
Period (y)              302.7930 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           40.94629485 +/-    0.0007
Ecliptic Y           12.54458151 +/-    0.0002
Ecliptic Z           -1.65302228 +/-    0.0000
Ecliptic XDOT        -0.00101182 +/-    0.0000
Ecliptic YDOT         0.00249321 +/-    0.0000
Ecliptic ZDOT         0.00008360 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.85671557 +/-    0.0007
Geocenter to KBO     42.46789845 +/-    0.0008
# Hcoef:  7.56

The following table shows the complete astrometric record for 13UD18. 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 (13UD18) followed by the observatory code and reference code for the source of the astrometry.

2013 08  02.53964  01 10 53.842  +05 06 29.94  24.0r 13UD18    568  C~2NKc      
2013 08  02.58233  01 10 53.790  +05 06 29.55  23.9r 13UD18    568  C~2NKc      
2013 08  30.46168  01 09 54.403  +04 59 19.11  24.1r 13UD18    568  C~2NKc      
2013 08  30.47107  01 09 54.402  +04 59 18.87  23.4r 13UD18    568  C~2NKc      
2013 08  30.47584  01 09 54.390  +04 59 19.06  24.2r 13UD18    568  C~2NKc      
2013 08  31.45951  01 09 51.322  +04 58 57.86  23.8r 13UD18    568  C~2NKc      
2013 08  31.52510  01 09 51.109  +04 58 56.55  23.7r 13UD18    568  C~2NKc      
2013 09  04.43928  01 09 38.325  +04 57 31.19  23.8r 13UD18    568  C~2NKc      
2013 09  04.51419  01 09 38.058  +04 57 29.84  23.9r 13UD18    568  C~2NKc      
2013 10  06.42079  01 07 29.546  +04 43 55.26  23.8r 13UD18    568  C~2NKc      
2013 10  31.26225  01 05 41.311  +04 33 11.71  23.6r 13UD18    568  C~2NKc      
2013 10  31.30520  01 05 41.122  +04 33 10.71  23.7r 13UD18    568  C~2NKc      
2013 10  31.34794  01 05 40.939  +04 33 09.87  23.7r 13UD18    568  C~2NKc      
2013 11  01.28901  01 05 37.082  +04 32 47.40  23.5r 13UD18    568  C~2NKc      
2013 11  01.29758  01 05 37.039  +04 32 47.30  23.6r 13UD18    568  C~2NKc      
2013 11  01.41864  01 05 36.550  +04 32 44.37  23.9r 13UD18    568  C~2NKc      
2013 11  05.46665  01 05 20.313  +04 31 12.03  23.8r 13UD18    568  C~2NKc      
2013 11  05.48471  01 05 20.234  +04 31 11.95  23.5r 13UD18    568  C~2NKc      
2013 11  07.43971  01 05 12.623  +04 30 28.63  23.5r 13UD18    568  C~2NKc      
2013 11  07.44747  01 05 12.592  +04 30 28.49  23.6r 13UD18    568  C~2NKc      
2013 11  07.45523  01 05 12.573  +04 30 28.42  23.6r 13UD18    568  C~2NKc      
2013 11  07.47861  01 05 12.474  +04 30 27.95  23.4r 13UD18    568  C~2NKc      
2013 12  04.27904  01 03 49.447  +04 23 09.31  23.5r 13UD18    568  C~2NKc      
2013 12  04.33121  01 03 49.346  +04 23 08.79  23.4r 13UD18    568  C~2NKc      
2013 12  05.25698  01 03 47.361  +04 22 59.62  23.8r 13UD18    568  C~2NKc      
2013 12  05.26547  01 03 47.343  +04 22 59.42  24.1r 13UD18    568  C~2NKc      
2014 06  27.60950  01 15 25.499  +05 38 19.76  23.7r 13UD18    568  C~2NKc      
2014 06  29.58512  01 15 29.451  +05 38 38.33  24.6r 13UD18    568  C~2NKc      
2014 07  24.56867  01 15 51.274  +05 39 37.97  23.7r 13UD18    568  C~2NKc      
2014 07  27.59948  01 15 50.311  +05 39 23.43  23.6r 13UD18    568  C~2NKc      
2014 08  24.51225  01 15 06.530  +05 33 46.29  23.8r 13UD18    568  C~2NKc      
2014 08  28.49059  01 14 55.578  +05 32 31.54  23.4r 13UD18    568  C~2NKc      
2014 10  23.28255  01 11 11.536  +05 09 17.09  23.5r 13UD18    568  C~2NKc      
2014 10  23.33619  01 11 11.298  +05 09 15.83  24.0r 13UD18    568  C~2NKc      
2014 10  23.39470  01 11 11.036  +05 09 14.29  23.7r 13UD18    568  C~2NKc      
2014 10  25.25994  01 11 02.922  +05 08 26.77  23.3r 13UD18    568  C~2NKc      
2014 10  25.35102  01 11 02.497  +05 08 24.37  24.1r 13UD18    568  C~2NKc      
2014 10  25.36233  01 11 02.477  +05 08 24.05  23.7r 13UD18    568  C~2NKc      
2014 10  25.46195  01 11 02.027  +05 08 21.47  23.5r 13UD18    568  C~2NKc      
2014 10  27.24998  01 10 54.317  +05 07 36.80  23.7r 13UD18    568  C~2NKc      
2014 10  27.30820  01 10 54.060  +05 07 35.30  23.5r 13UD18    568  C~2NKc      
2014 10  27.37469  01 10 53.771  +05 07 33.69  23.6r 13UD18    568  C~2NKc      
2014 10  29.26294  01 10 45.719  +05 06 47.07  23.6r 13UD18    568  C~2NKc      
2014 11  24.24388  01 09 09.060  +04 57 52.63  23.8r 13UD18    568  C~2NKc      
2014 11  25.24005  01 09 06.059  +04 57 37.09  23.8r 13UD18    568  C~2NKc      
2014 12  17.25485  01 08 18.522  +04 53 58.03  24.3r 13UD18    568  C~2NKc      
2015 01  17.23854  01 08 21.605  +04 56 14.38  23.9r 13UD18    568  C~2NKc      
2015 08  20.51066  01 20 12.080  +06 07 17.10  23.7r 13UD18    568  C~2NKc      
2015 12  07.37779  01 13 28.955  +05 27 31.44  23.9w 13UD18    568  C~2NKc      

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    -0.03       0.00    -0.08
  2   0.0001     -0.87    -0.08      -0.07    -0.05
  3   0.0764   -985.19    -0.32     -61.71     0.26
  4   0.0765   -985.29     0.06     -61.92     0.05
  5   0.0765   -985.38     0.21     -61.68     0.30
  6   0.0792  -1035.85     0.02     -63.89    -0.20
  7   0.0794  -1039.29     0.04     -63.90    -0.12
  8   0.0901  -1248.44     0.07     -70.35    -0.20
  9   0.0903  -1252.64     0.08     -70.09     0.15
 10   0.1776  -3339.16     0.00     -93.67    -0.05
 11   0.2456  -5081.24     0.10     -72.79    -0.14
 12   0.2458  -5084.24    -0.02     -72.64    -0.07
 13   0.2459  -5087.09     0.00     -72.37     0.10
 14   0.2485  -5149.01    -0.08     -71.18    -0.16
 15   0.2485  -5149.65    -0.14     -71.02    -0.02
 16   0.2488  -5157.53     0.04     -70.95    -0.20
 17   0.2599  -5417.36     0.16     -63.81    -0.04
 18   0.2599  -5418.48     0.19     -63.43     0.30
 19   0.2653  -5540.30    -0.08     -60.11    -0.04
 20   0.2653  -5540.78    -0.08     -60.07    -0.01
 21   0.2653  -5541.07     0.12     -60.02     0.02
 22   0.2654  -5542.62     0.03     -59.89     0.09
 23   0.3388  -6858.92    -0.33       8.12     0.13
 24   0.3389  -6860.51    -0.08       8.21     0.04
 25   0.3415  -6891.49     0.11      11.07     0.07
 26   0.3415  -6891.81     0.07      10.98    -0.04
 27   0.9009   4478.63     0.04     232.99    -0.08
 28   0.9064   4540.30     0.04     227.92     0.07
 29   0.9748   4864.64    -0.03     160.20    -0.07
 30   0.9831   4845.83    -0.06     152.16    -0.08
 31   1.0595   4113.01     0.01      86.63    -0.02
 32   1.0704   3933.31     0.02      79.16    -0.02
 33   1.2231    307.98    -0.01      54.45     0.02
 34   1.2233    304.22     0.04      54.63     0.12
 35   1.2234    300.01     0.01      54.69     0.09
 36   1.2285    169.82     0.12      56.67     0.00
 37   1.2288    163.04    -0.24      56.86     0.04
 38   1.2288    162.64     0.16      56.68    -0.16
 39   1.2291    155.44     0.00      56.84    -0.16
 40   1.2340     31.92    -0.01      59.18     0.03
 41   1.2341     27.80    -0.07      59.24    -0.00
 42   1.2343     23.19    -0.03      59.39     0.03
 43   1.2395   -105.80     0.01      61.87    -0.01
 44   1.3106  -1644.89     0.08     115.55     0.06
 45   1.3133  -1692.28    -0.12     118.21     0.05
 46   1.3736  -2432.73    -0.15     185.51    -0.04
 47   1.4585  -2338.28     0.03     294.12     0.02
 48   2.0478   9099.37    -0.10     232.62    -0.03
 49   2.3459   2622.12     0.18     290.16     0.04

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.

13UD18    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.327    45.343    45.311
ecceobj         0.102     0.104     0.101
incobj          2.722     2.723     2.722
qmin           39.431    39.359    39.511
qmax           50.877    50.988    50.772
amean          45.019    45.034    45.003
amin           44.650    44.671    44.632
amax           45.411    45.443    45.414
emean           0.105     0.107     0.104
emin            0.091     0.092     0.089
emax            0.121     0.123     0.119
imean           1.381     1.389     1.375
imin            0.648     0.645     0.649
imax            1.983     1.997     1.970
excite_mean     0.108     0.110     0.107
fracstop        1.000     1.000     1.000
cjmean          3.100     3.099     3.100

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       165.8     165.3     164.8
kozaiamp        179.9     179.9     179.9