Orbit Fit and Astrometric record for 13UB18

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: 13UB18    
# Created Fri Dec 15 02:37:55 2017
# Orbit generated from Bernstein formalism
# Fitting   28 observations of   28
# Arc:   1.46y
# First observation: 2013/08/02
#  Last observation: 2015/01/17
Preliminary a, adot, b, bdot, g, gdot:
  -0.000118   0.022213  -0.000004  -0.000624   0.023041   0.000000
# Chi-squared of fit:    10.53 DOF:   50 RMS:  0.11
# Min/Max residuals:    -0.24    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.499361E-05  2.206455E-02 -6.773282E-08 -6.208978E-04  2.296580E-02  5.010689E-05
# Covariance matrix:
  2.7235E-13  4.1308E-14  7.5913E-15 -1.8609E-14  2.9839E-13  1.5373E-11
  4.1308E-14  3.5176E-13  7.3992E-15 -1.9597E-14  2.8603E-13  1.6547E-11
  7.5913E-15  7.3992E-15  1.1062E-13 -1.1053E-13  1.4432E-14  8.4264E-13
 -1.8609E-14 -1.9597E-14 -1.1053E-13  2.0826E-13 -3.7372E-14 -2.5995E-12
  2.9839E-13  2.8603E-13  1.4432E-14 -3.7372E-14  5.6071E-13  3.1362E-11
  1.5373E-11  1.6547E-11  8.4264E-13 -2.5995E-12  3.1362E-11  2.2786E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -3.165932   17.862705    0.941043   -0.021235   -0.384455  2456507.036518
# Heliocentric elements and errors
Epoch:              2456500.5000  =  2013/07/27
Mean Anomaly:          324.81512 +/-     2.587
Argument of Peri:      279.45366 +/-     2.834
Long of Asc Node:      134.86701 +/-     0.017
Inclination:             3.55988 +/-     0.001
Eccentricity:         0.03610664 +/-    0.0013
Semi-Major Axis:     45.25349932 +/-    0.0049
Time of Perihelion: 2467368.0159 +/-     799.2
Perihelion:          43.61954764 +/-    0.0602
Aphelion:            46.88745100 +/-    0.0603
Period (y)              304.4293 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           42.03560794 +/-    0.0014
Ecliptic Y           12.56142916 +/-    0.0004
Ecliptic Z           -2.40474663 +/-    0.0001
Ecliptic XDOT        -0.00081129 +/-    0.0000
Ecliptic YDOT         0.00250336 +/-    0.0000
Ecliptic ZDOT        -0.00007410 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.93819117 +/-    0.0013
Geocenter to KBO     43.54300413 +/-    0.0014
# Hcoef:  7.74

The following table shows the complete astrometric record for 13UB18. 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 (13UB18) followed by the observatory code and reference code for the source of the astrometry.

2013 08  02.53574  01 10 43.692  +04 04 49.45  23.8r 13UB18    568  C~2NKc      
2013 08  02.57845  01 10 43.641  +04 04 49.00  23.9r 13UB18    568  C~2NKc      
2013 08  30.45291  01 09 45.861  +03 56 55.78  24.1r 13UB18    568  C~2NKc      
2013 08  30.45765  01 09 45.846  +03 56 55.50  24.0r 13UB18    568  C~2NKc      
2013 08  31.45558  01 09 42.795  +03 56 33.19  24.0r 13UB18    568  C~2NKc      
2013 08  31.52122  01 09 42.604  +03 56 32.01  24.2r 13UB18    568  C~2NKc      
2013 09  04.43540  01 09 30.143  +03 55 02.33  24.1r 13UB18    568  C~2NKc      
2013 09  04.51028  01 09 29.901  +03 55 00.77  23.8r 13UB18    568  C~2NKc      
2013 10  06.41689  01 07 24.884  +03 41 07.28  24.0r 13UB18    568  C~2NKc      
2013 10  31.25837  01 05 39.635  +03 30 27.46  23.6r 13UB18    568  C~2NKc      
2013 10  31.30132  01 05 39.475  +03 30 26.40  24.0r 13UB18    568  C~2NKc      
2013 10  31.34404  01 05 39.299  +03 30 25.52  24.2r 13UB18    568  C~2NKc      
2013 11  01.28510  01 05 35.548  +03 30 03.60  24.2r 13UB18    568  C~2NKc      
2013 11  01.41360  01 05 35.031  +03 30 00.60  24.5r 13UB18    568  C~2NKc      
2013 11  05.46270  01 05 19.226  +03 28 29.98  24.0r 13UB18    568  C~2NKc      
2013 12  04.27516  01 03 50.964  +03 20 46.68  24.3r 13UB18    568  C~2NKc      
2013 12  04.32732  01 03 50.830  +03 20 46.13  24.1r 13UB18    568  C~2NKc      
2013 12  06.22106  01 03 46.948  +03 20 29.36  24.0r 13UB18    568  C~2NKc      
2014 06  27.60559  01 15 08.808  +04 32 37.21  24.2r 13UB18    568  C~2NKc      
2014 06  28.61065  01 15 10.798  +04 32 44.34  24.2r 13UB18    568  C~2NKc      
2014 08  22.55650  01 14 54.959  +04 26 40.93  24.1r 13UB18    568  C~2NKc      
2014 08  28.41844  01 14 39.653  +04 24 44.77  24.0r 13UB18    568  C~2NKc      
2014 10  23.36404  01 11 01.454  +04 00 57.86  22.6r 13UB18    568  C~2NKc      
2014 10  27.40273  01 10 44.452  +03 59 17.24  24.1r 13UB18    568  C~2NKc      
2014 11  24.28276  01 09 02.858  +03 49 53.87  24.0r 13UB18    568  C~2NKc      
2014 11  25.30908  01 08 59.869  +03 49 38.70  24.9r 13UB18    568  C~2NKc      
2014 12  17.24304  01 08 14.042  +03 46 20.19  24.3r 13UB18    568  C~2NKc      
2015 01  17.26915  01 08 17.194  +03 48 59.00  23.8r 13UB18    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     0.04       0.00    -0.07
  2   0.0001     -0.88     0.00      -0.13    -0.03
  3   0.0764   -980.39     0.18    -109.63    -0.01
  4   0.0764   -980.71     0.11    -109.80    -0.17
  5   0.0792  -1031.42    -0.24    -113.10    -0.23
  6   0.0794  -1034.51     0.08    -113.10    -0.05
  7   0.0901  -1241.08    -0.17    -125.22    -0.01
  8   0.0903  -1245.02     0.05    -125.29     0.11
  9   0.1776  -3292.79    -0.10    -184.81     0.07
 10   0.2456  -4994.05    -0.16    -176.64     0.13
 11   0.2458  -4996.67     0.02    -176.70    -0.01
 12   0.2459  -4999.44     0.05    -176.51     0.11
 13   0.2485  -5059.75     0.00    -175.39    -0.01
 14   0.2488  -5068.06     0.04    -175.21    -0.07
 15   0.2599  -5321.53    -0.14    -168.85     0.03
 16   0.3388  -6721.14     0.15     -93.38     0.03
 17   0.3389  -6723.20    -0.13     -93.13     0.08
 18   0.3441  -6783.40     0.23     -86.46     0.23
 19   0.9009   4302.34     0.02      40.87     0.07
 20   0.9037   4332.59     0.00      36.22     0.05
 21   1.0541   3975.73     0.05    -210.65    -0.18
 22   1.0702   3719.80     0.07    -231.57     0.00
 23   1.2233    157.99    -0.13    -315.13    -0.03
 24   1.2344   -115.57    -0.04    -311.67    -0.01
 25   1.3107  -1736.02    -0.08    -255.40     0.03
 26   1.3135  -1783.17    -0.18    -252.43    -0.06
 27   1.3736  -2493.11     0.23    -175.29    -0.02
 28   1.4585  -2389.08     0.05     -46.34     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.

13UB18    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.498    45.508    45.489
ecceobj         0.039     0.041     0.038
incobj          3.555     3.555     3.555
qmin           42.682    42.635    42.744
qmax           47.910    48.001    47.863
amean          45.202    45.214    45.193
amin           44.850    44.852    44.841
amax           45.577    45.574    45.561
emean           0.038     0.040     0.038
emin            0.025     0.027     0.024
emax            0.052     0.053     0.051
imean           2.590     2.590     2.590
imin            2.133     2.133     2.137
imax            3.040     3.044     3.042
excite_mean     0.059     0.061     0.059
fracstop        1.000     1.000     1.000
cjmean          3.112     3.112     3.112

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       182.8     182.5     184.3
kozaiamp        180.0     180.0     180.0