Orbit Fit and Astrometric record for 12UK177

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: 12UK177   
# Created Tue Dec 12 02:37:55 2017
# Orbit generated from Bernstein formalism
# Fitting   25 observations of   25
# Arc:   1.46y
# First observation: 2011/09/01
#  Last observation: 2013/02/14
Preliminary a, adot, b, bdot, g, gdot:
   0.000017   0.034065  -0.000040  -0.011470   0.027669   0.000000
# Chi-squared of fit:     6.51 DOF:   44 RMS:  0.09
# Min/Max residuals:    -0.24    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.846023E-05  3.390399E-02 -5.932307E-06 -1.151728E-02  2.762352E-02 -5.577075E-03
# Covariance matrix:
  3.3077E-13  1.1056E-13  2.9424E-14 -1.9795E-13  2.9675E-13  1.1794E-11
  1.1056E-13  1.1050E-12  9.3259E-14 -6.0887E-13  8.1869E-13  3.5982E-11
  2.9424E-14  9.3259E-14  2.3209E-13 -2.6162E-13  7.9933E-14  4.0840E-12
 -1.9795E-13 -6.0887E-13 -2.6162E-13  6.7051E-13 -5.3713E-13 -2.6077E-11
  2.9675E-13  8.1869E-13  7.9933E-14 -5.3713E-13  8.0213E-13  3.1994E-11
  1.1794E-11  3.5982E-11  4.0840E-12 -2.6077E-11  3.1994E-11  1.5315E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   17.188350   31.779081    0.807903    0.177197   -0.572969  2455805.923946
# Heliocentric elements and errors
Epoch:              2455800.5000  =  2011/08/27
Mean Anomaly:          355.16703 +/-     0.026
Argument of Peri:      162.15768 +/-     0.143
Long of Asc Node:      251.53195 +/-     0.001
Inclination:            24.82709 +/-     0.001
Eccentricity:         0.62413214 +/-    0.0007
Semi-Major Axis:     94.06692725 +/-    0.1432
Time of Perihelion: 2460274.1817 +/-      22.0
Perihelion:          35.35673462 +/-    0.0876
Aphelion:           152.77711988 +/-    0.2426
Period (y)              912.3545 +/-      2.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           30.33825276 +/-    0.0010
Ecliptic Y           17.84402019 +/-    0.0006
Ecliptic Z           10.69773052 +/-    0.0003
Ecliptic XDOT        -0.00193502 +/-    0.0000
Ecliptic YDOT         0.00276150 +/-    0.0000
Ecliptic ZDOT        -0.00125382 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.78668340 +/-    0.0008
Geocenter to KBO     36.20103550 +/-    0.0012
# Hcoef:  8.80

The following table shows the complete astrometric record for 12UK177. 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 (12UK177) followed by the observatory code and reference code for the source of the astrometry.

2011 09  01.42318  01 31 50.459  +28 06 58.05  24.3r 12UK177   568  C~1C6U      
2011 09  01.46869  01 31 50.273  +28 06 58.00  24.0r 12UK177   568  C~1C6U      
2011 09  01.51133  01 31 50.148  +28 06 58.23  24.5r 12UK177   568  C~1C6U      
2011 09  05.45125  01 31 36.616  +28 06 50.57  24.3r 12UK177   568  C~1C6U      
2011 11  24.35514  01 25 08.760  +27 27 13.47  24.4r 12UK177   568  C~1C6U      
2011 11  30.31101  01 24 47.032  +27 22 41.02  24.5r 12UK177   568  C~1C6U      
2011 12  01.35919  01 24 43.521  +27 21 53.14  24.3r 12UK177   568  C~1C6U      
2012 01  28.23315  01 24 33.037  +26 47 34.92  24.6r 12UK177   568  C~1C6U      
2012 08  18.50920  01 41 44.241  +28 12 48.53  24.3r 12UK177   568  C~1C6U      
2012 08  18.54805  01 41 44.161  +28 12 48.88  24.4r 12UK177   568  C~1C6U      
2012 08  28.50703  01 41 21.374  +28 13 57.14  24.7r 12UK177   568  C~1C6U      
2012 09  12.40702  01 40 30.283  +28 13 18.36  24.1r 12UK177   568  C~1C6U      
2012 09  14.44299  01 40 21.913  +28 12 59.73  24.1r 12UK177   568  C~1C6U      
2012 10  19.38154  01 37 25.634  +27 59 52.70  24.1r 12UK177   568  C~1C6U      
2012 10  19.42436  01 37 25.395  +27 59 51.26  24.0r 12UK177   568  C~1C6U      
2012 10  20.37365  01 37 20.194  +27 59 18.75  24.2r 12UK177   568  C~1C6U      
2012 10  20.41255  01 37 19.968  +27 59 17.40        12UK177   568  C~1C6U      
2012 10  20.45104  01 37 19.759  +27 59 16.16  24.0r 12UK177   568  C~1C6U      
2012 10  21.46079  01 37 14.224  +27 58 41.09  24.6r 12UK177   568  C~1C6U      
2012 11  14.37175  01 35 09.717  +27 42 42.95  24.4r 12UK177   568  C~1C6U      
2013 01  14.26447  01 33 07.625  +27 01 21.27  24.3r 12UK177   568  C~1C6U      
2013 01  14.27309  01 33 07.637  +27 01 21.01  24.5r 12UK177   568  C~1C6U      
2013 02  06.23610  01 34 09.581  +26 53 12.28  24.8r 12UK177   568  C~1C6U      
2013 02  06.24917  01 34 09.634  +26 53 12.06  24.2r 12UK177   568  C~1C6U      
2013 02  14.23326  01 34 44.798  +26 51 51.62        12UK177   568  C~1C6U      

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     0.20       0.00    -0.14
  2   0.0001     -2.29    -0.24       0.90    -0.02
  3   0.0002     -3.73     0.08       1.74     0.11
  4   0.0110   -172.00     0.06      63.35     0.02
  5   0.2298  -5840.07    -0.04    -118.74    -0.00
  6   0.2461  -6213.98    -0.06    -254.30    -0.01
  7   0.2490  -6275.96    -0.06    -279.72    -0.06
  8   0.4074  -7222.39     0.13   -2114.56    -0.02
  9   0.9640   7416.93     0.14   -2612.54    -0.04
 10   0.9641   7416.07     0.03   -2611.83    -0.07
 11   0.9913   7160.19     0.03   -2438.20     0.10
 12   1.0321   6516.84    -0.04   -2226.88     0.09
 13   1.0377   6406.98     0.05   -2203.58    -0.01
 14   1.1334   3947.22    -0.10   -2071.55     0.10
 15   1.1335   3943.75    -0.09   -2071.71     0.11
 16   1.1361   3867.67    -0.10   -2076.18     0.01
 17   1.1362   3864.39    -0.20   -2076.31     0.04
 18   1.1363   3861.36    -0.09   -2076.43     0.09
 19   1.1390   3780.22    -0.06   -2081.61     0.07
 20   1.2045   1889.57     0.04   -2350.23     0.03
 21   1.3712   -556.47     0.04   -4030.58    -0.03
 22   1.3713   -556.42     0.06   -4030.89    -0.04
 23   1.4341     24.06     0.10   -4798.04    -0.11
 24   1.4342     24.63     0.11   -4798.51    -0.16
 25   1.4560    429.78     0.03   -5051.21    -0.06

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.

12UK177    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        94.511    94.855    94.176
ecceobj         0.626     0.627     0.624
incobj         24.825    24.825    24.824
qmin           32.947    33.004    34.537
qmax          158.534   157.181   153.305
amean          93.280    92.510    91.920
amin           90.571    89.054    90.192
amax           96.655    95.515    94.308
emean           0.627     0.624     0.613
emin            0.607     0.600     0.600
emax            0.648     0.646     0.626
imean          25.325    25.337    26.330
imin           23.884    23.999    25.773
imax           26.728    26.549    27.008
excite_mean     0.759     0.757     0.757
fracstop        1.000     1.000     1.000
cjmean          2.800     2.799     2.802

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       211.7     240.4     209.9
kozaiamp        180.0     180.0      51.4