Orbit Fit and Astrometric record for 12UN177

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: 12UN177   
# Created Wed Oct 17 01:09:16 2018
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   37 observations of   37
# Arc:   8.92y
# First observation: 2009/01/18
#  Last observation: 2017/12/20
# Chi-squared of fit:    23.36 DOF:   68 RMS:  0.14
# Min/Max residuals:    -0.29    0.45
# Exact a, adot, b, bdot, g, gdot:
  1.786064E-05  2.915474E-02  4.389957E-06  7.502032E-03  2.717686E-02 -2.468408E-03
# Covariance matrix:
  3.4490E-13 -1.1932E-13  4.3095E-14 -2.1263E-14 -7.2026E-14 -3.0619E-13
 -1.1932E-13  7.2330E-14 -2.4921E-14  1.6331E-14  4.0507E-16  2.3393E-13
  4.3095E-14 -2.4921E-14  1.6722E-13 -4.2414E-14 -8.9137E-15 -9.3480E-14
 -2.1263E-14  1.6331E-14 -4.2414E-14  1.5232E-14 -7.4908E-16  6.2307E-14
 -7.2026E-14  4.0507E-16 -8.9137E-15 -7.4908E-16  6.7518E-14 -9.2205E-15
 -3.0619E-13  2.3393E-13 -9.3480E-14  6.2307E-14 -9.2205E-15  8.9230E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   14.540039   24.916545   -0.987354   -0.013576    0.052473  2454849.670784
# Heliocentric elements and errors
Epoch:              2454850.5000  =  2009/01/19
Mean Anomaly:          343.50524 +/-     0.011
Argument of Peri:       69.93769 +/-     0.015
Long of Asc Node:      341.21869 +/-     0.000
Inclination:            20.07381 +/-     0.000
Eccentricity:         0.15901903 +/-    0.0000
Semi-Major Axis:     43.23596443 +/-    0.0022
Time of Perihelion: 2459608.3367 +/-       8.3
Perihelion:          36.36062350 +/-    0.0023
Aphelion:            50.11130535 +/-    0.0029
Period (y)              284.2994 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           31.83910793 +/-    0.0003
Ecliptic Y           15.87431759 +/-    0.0002
Ecliptic Z            9.23802962 +/-    0.0001
Ecliptic XDOT        -0.00162231 +/-    0.0000
Ecliptic YDOT         0.00248545 +/-    0.0000
Ecliptic ZDOT         0.00066903 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.75685640 +/-    0.0003
Geocenter to KBO     36.79610582 +/-    0.0004
# Hcoef:  7.55

The following table shows the complete astrometric record for 12UN177. 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 (12UN177) followed by the observatory code and reference code for the source of the astrometry.

2009 01  18.170018 01 09 24.29   +23 06 48.9         12UN177   645  C~1RIb      
2009 01  18.170848 01 09 24.29   +23 06 48.9         12UN177   645  C~1RIb      
2009 01  18.173335 01 09 24.30   +23 06 48.9         12UN177   645  C~1RIb      
2009 09  26.399283 01 21 46.16   +25 02 14.9   22.8V 12UN177   645  C~1RIb      
2009 09  26.400113 01 21 46.15   +25 02 14.9   22.2V 12UN177   645  C~1RIb      
2009 09  26.402600 01 21 46.14   +25 02 14.9   23.9V 12UN177   645  C~1RIb      
2011 08  31.49780  01 36 41.788  +27 07 24.71  23.0r 12UN177   568  C~1C6U      
2011 08  31.54070  01 36 41.628  +27 07 25.07  23.2r 12UN177   568  C~1C6U      
2011 08  31.60502  01 36 41.389  +27 07 25.52  23.2r 12UN177   568  C~1C6U      
2011 09  05.51099  01 36 23.114  +27 07 56.96  22.9r 12UN177   568  C~1C6U      
2011 11  24.36793  01 29 21.046  +26 40 21.77  23.1r 12UN177   568  C~1C6U      
2011 11  30.37304  01 28 55.963  +26 36 45.59  23.1r 12UN177   568  C~1C6U      
2011 12  01.37198  01 28 52.085  +26 36 09.75  23.1r 12UN177   568  C~1C6U      
2012 01  28.24324  01 28 09.511  +26 11 06.41  23.0r 12UN177   568  C~1C6U      
2012 02  24.25014  01 29 57.941  +26 11 08.85  23.0r 12UN177   568  C~1C6U      
2012 08  18.50920  01 43 54.022  +28 04 21.86  23.0r 12UN177   568  C~1C6U      
2012 08  18.54805  01 43 53.935  +28 04 22.68        12UN177   568  C~1C6U      
2012 08  23.60417  01 43 41.650  +28 05 50.68  23.2r 12UN177   568  C~1C6U      
2012 08  24.41397  01 43 39.460  +28 06 02.88  23.1r 12UN177   568  C~1C6U      
2012 08  24.46174  01 43 39.316  +28 06 03.76  23.2r 12UN177   568  C~1C6U      
2012 08  28.50703  01 43 27.309  +28 06 58.19  23.3r 12UN177   568  C~1C6U      
2012 09  12.40702  01 42 30.229  +28 08 33.04  23.1r 12UN177   568  C~1C6U      
2012 09  14.44299  01 42 21.015  +28 08 32.89  23.1r 12UN177   568  C~1C6U      
2012 10  19.38154  01 39 09.624  +28 00 46.03  22.9r 12UN177   568  C~1C6U      
2012 10  19.42436  01 39 09.365  +28 00 44.93  23.1r 12UN177   568  C~1C6U      
2012 10  20.37365  01 39 03.729  +28 00 21.26  22.9r 12UN177   568  C~1C6U      
2012 10  20.41255  01 39 03.493  +28 00 20.31        12UN177   568  C~1C6U      
2012 10  20.45104  01 39 03.260  +28 00 19.33  23.1r 12UN177   568  C~1C6U      
2012 10  21.46079  01 38 57.268  +27 59 53.66  22.9r 12UN177   568  C~1C6U      
2012 11  14.37175  01 36 41.565  +27 47 34.81  23.1r 12UN177   568  C~1C6U      
2013 02  04.22240  01 34 54.407  +27 10 17.30  23.4r 12UN177   568  C~1C6U      
2013 02  06.23610  01 35 01.275  +27 10 05.72  23.2r 12UN177   568  C~1C6U      
2013 02  14.26333  01 35 32.960  +27 09 49.90  23.3r 12UN177   568  C~1C6U      
2013 02  16.26499  01 35 41.897  +27 09 53.41  23.5r 12UN177   568  C~1C6U      
2013 02  17.22194  01 35 46.308  +27 09 56.45  23.2r 12UN177   568  C~1C6U      
2017 12  20.10863  02 09 01.970  +32 17 28.22  23.0R 12UN177   G37  C~2Uwm      
2017 12  20.18014  02 09 01.738  +32 17 25.62        12UN177   G37  C~2Uwm      

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    -0.21       0.00    -0.07
  2   0.0000      0.00    -0.23       0.00    -0.06
  3   0.0000      0.00    -0.15       0.00    -0.03
  4   0.6878      0.00     0.45       0.00    -0.03
  5   0.6878      0.00     0.37       0.00    -0.02
  6   0.6878      0.00     0.42       0.00     0.02
  7   2.6155      0.00     0.04       0.00    -0.09
  8   2.6157      0.00    -0.03       0.00    -0.09
  9   2.6158      0.00    -0.13       0.00    -0.17
 10   2.6293      0.00    -0.03       0.00     0.01
 11   2.8479      0.00     0.18       0.00     0.09
 12   2.8643      0.00     0.14       0.00     0.08
 13   2.8671      0.00     0.12       0.00     0.07
 14   3.0255      0.00     0.13       0.00    -0.05
 15   3.0995      0.00     0.01       0.00     0.13
 16   3.5820      0.00    -0.02       0.00     0.16
 17   3.5821      0.00    -0.00       0.00     0.22
 18   3.5960      0.00     0.07       0.00     0.05
 19   3.5982      0.00     0.09       0.00    -0.08
 20   3.5983      0.00    -0.04       0.00     0.05
 21   3.6094      0.00     0.18       0.00    -0.03
 22   3.6502      0.00    -0.25       0.00     0.11
 23   3.6558      0.00    -0.24       0.00     0.11
 24   3.7514      0.00    -0.05       0.00    -0.00
 25   3.7516      0.00    -0.04       0.00    -0.05
 26   3.7542      0.00    -0.06       0.00    -0.05
 27   3.7543      0.00    -0.06       0.00    -0.02
 28   3.7544      0.00    -0.07       0.00    -0.03
 29   3.7571      0.00     0.04       0.00     0.06
 30   3.8226      0.00     0.08       0.00     0.13
 31   4.0467      0.00     0.23       0.00     0.11
 32   4.0522      0.00     0.03       0.00     0.00
 33   4.0742      0.00    -0.29       0.00    -0.08
 34   4.0797      0.00    -0.14       0.00    -0.19
 35   4.0823      0.00    -0.10       0.00     0.03
 36   8.9197      0.00     0.15       0.00    -0.08
 37   8.9199      0.00     0.22       0.00    -0.05

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.

12UN177    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        43.594    43.594    43.594
ecceobj         0.166     0.166     0.166
incobj         20.064    20.064    20.064
qmin           35.734    35.736    35.732
qmax           51.059    51.056    51.046
amean          43.215    43.215    43.215
amin           42.859    42.854    42.857
amax           43.621    43.620    43.624
emean           0.154     0.154     0.154
emin            0.138     0.137     0.138
emax            0.171     0.171     0.171
imean          20.935    20.935    20.935
imin           20.432    20.427    20.432
imax           21.496    21.495    21.498
excite_mean     0.389     0.389     0.389
fracstop        1.000     1.000     1.000
cjmean          2.908     2.908     2.908

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       176.6     176.7     176.7
kozaiamp        180.0     180.0     180.0