Orbit Fit and Astrometric record for 01UN18

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: 01UN18    
# Created Wed Oct 18 01:37:16 2017
# Orbit generated from Bernstein formalism
# Fitting   15 observations of   15
# Arc:  11.96y
# First observation: 2001/10/19
#  Last observation: 2013/10/06
Preliminary a, adot, b, bdot, g, gdot:
   0.000109   0.019868  -0.000023   0.001252   0.024671   0.000000
# WARNING -- MRQMIN stopped after  23 iterations
# Chi-squared of fit:    12.48 DOF:   24 RMS:  0.16
# Min/Max residuals:    -0.32    0.30
# Exact a, adot, b, bdot, g, gdot:
  1.550914E-05  1.980910E-02 -1.197933E-07  1.245077E-03  2.204944E-02  1.089139E-03
# Covariance matrix:
  3.4402E-13 -6.0013E-14  1.7638E-15 -1.4125E-15  5.6040E-13 -9.3722E-14
 -6.0013E-14  1.3116E-13 -1.1880E-14  9.0776E-15  9.2545E-13  6.0404E-13
  1.7638E-15 -1.1880E-14  2.1597E-13 -2.5355E-14 -9.8138E-14 -5.7945E-14
 -1.4125E-15  9.0776E-15 -2.5355E-14  5.7704E-15  7.4540E-14  4.4234E-14
  5.6040E-13  9.2545E-13 -9.8138E-14  7.4540E-14  1.2453E-11  4.9619E-12
 -9.3722E-14  6.0404E-13 -5.7945E-14  4.4234E-14  4.9619E-12  2.9436E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.264647   18.718396   -0.122310   -0.004648   -0.984045  2452201.882423
# Heliocentric elements and errors
Epoch:              2452200.5000  =  2001/10/18
Mean Anomaly:          125.78421 +/-     0.303
Argument of Peri:      223.94504 +/-     0.242
Long of Asc Node:       22.98963 +/-     0.000
Inclination:             3.60599 +/-     0.000
Eccentricity:         0.06960521 +/-    0.0003
Semi-Major Axis:     44.40027534 +/-    0.0250
Time of Perihelion: 2414443.2329 +/-      85.0
Perihelion:          41.30978468 +/-    0.0273
Aphelion:            47.49076600 +/-    0.0303
Period (y)              295.8603 +/-      0.25
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           43.84803906 +/-    0.0069
Ecliptic Y           14.99216399 +/-    0.0023
Ecliptic Z           -0.20948142 +/-    0.0000
Ecliptic XDOT        -0.00066927 +/-    0.0000
Ecliptic YDOT         0.00237378 +/-    0.0000
Ecliptic ZDOT         0.00015419 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   46.34068831 +/-    0.0066
Geocenter to KBO     45.35261811 +/-    0.0073
# Hcoef:  6.46

The following table shows the complete astrometric record for 01UN18. 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 (01UN18) followed by the observatory code and reference code for the source of the astrometry.

2001 10  19.38168  01 09 28.96   +07 05 21.1   22.7R 01UN18    695  Ce1017      
2001 10  19.42429  01 09 28.81   +07 05 19.8         01UN18    695  Ce1017      
2001 10  20.37617  01 09 24.85   +07 04 56.5         01UN18    695  Ce1017      
2002 11  07.13992  01 12 22.56   +07 27 51.6   22.8R 01UN18    695  Cj4622      
2002 11  07.24749  01 12 22.14   +07 27 49.2         01UN18    695  Cj4622      
2003 10  23.15737  01 17 30.12   +08 03 14.7   22.5R 01UN18    695  Cj4622      
2003 10  23.25280  01 17 29.73   +08 03 12.4         01UN18    695  Cj4622      
2005 10  27.45539  01 25 23.97   +08 59 35.1   23.0R 01UN18    568  Cp1907      
2005 10  27.49229  01 25 23.82   +08 59 34.2         01UN18    568  Cp1907      
2008 11  01.385062 01 37 24.53   +10 23 14.7   22.9V 01UN18    645  C~2Jx5      
2008 11  01.385891 01 37 24.54   +10 23 14.7   22.7V 01UN18    645  C~2Jx5      
2008 11  01.388379 01 37 24.54   +10 23 14.8   23.5V 01UN18    645  C~2Jx5      
2013 10  05.42240  02 00 06.17   +12 51 19.3   23.2R 01UN18    695  C~0zdE      
2013 10  05.48612  02 00 05.92   +12 51 18.2         01UN18    695  C~0zdE      
2013 10  06.43442  02 00 02.11   +12 50 58.3         01UN18    695  C~0zdE      

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    -0.27       0.00     0.21
  2   0.0001     -2.56     0.04      -0.36    -0.19
  3   0.0027    -65.94    -0.11       0.47    -0.07
  4   1.0507   2902.33     0.16     271.09     0.05
  5   1.0510   2895.63    -0.01     271.23     0.06
  6   2.0090   7940.27     0.06     515.62     0.11
  7   2.0092   7934.03     0.24     515.66     0.05
  8   4.0221  15749.75     0.01    1031.56     0.14
  9   4.0222  15747.34     0.07    1031.54     0.09
 10   7.0363  27635.75    -0.28    1804.30    -0.27
 11   7.0363  27635.89    -0.09    1804.24    -0.32
 12   7.0363  27635.93     0.12    1804.34    -0.23
 13  11.9618  50290.37    -0.06    3092.42     0.14
 14  11.9620  50286.33     0.15    3092.64     0.30
 15  11.9646  50223.65    -0.04    3093.02    -0.08

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.

01UN18    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.591    44.667    44.515
ecceobj         0.069     0.068     0.070
incobj          3.596     3.596     3.596
qmin           40.454    40.560    40.356
qmax           48.375    48.423    48.380
amean          44.302    44.377    44.228
amin           43.944    44.034    43.873
amax           44.671    44.741    44.607
emean           0.069     0.068     0.070
emin            0.053     0.052     0.054
emax            0.083     0.083     0.085
imean           3.407     3.418     3.398
imin            2.701     2.734     2.677
imax            3.962     3.941     3.989
excite_mean     0.091     0.091     0.092
fracstop        1.000     1.000     1.000
cjmean          3.095     3.096     3.094

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       182.0     181.0     182.9
kozaiamp        179.9     180.0     179.9