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: 12UW177 # Created Fri Apr 19 01:14:10 2024 # Orbit generated from Bernstein formalism # Fitting 19 observations of 19 # Arc: 1.04y # First observation: 2012/08/18 # Last observation: 2013/09/03 Preliminary a, adot, b, bdot, g, gdot: -0.000551 0.043167 0.000131 0.053061 0.045135 0.000000 # Chi-squared of fit: 10.35 DOF: 32 RMS: 0.13 # Min/Max residuals: -0.35 0.30 # Exact a, adot, b, bdot, g, gdot: 1.455581E-05 4.194761E-02 1.799587E-05 5.271709E-02 4.533100E-02 -1.540325E-03 # Covariance matrix: 2.4213E-13 6.1497E-14 -6.7231E-14 4.0905E-13 2.7682E-13 6.8908E-12 6.1497E-14 3.0137E-12 -4.9593E-13 3.4312E-12 1.4802E-12 5.8954E-11 -6.7231E-14 -4.9593E-13 2.5216E-13 -1.0112E-12 -3.3799E-13 -1.3413E-11 4.0905E-13 3.4312E-12 -1.0112E-12 6.2824E-12 2.2695E-12 9.3691E-11 2.7682E-13 1.4802E-12 -3.3799E-13 2.2695E-12 1.1024E-12 3.8825E-11 6.8908E-12 5.8954E-11 -1.3413E-11 9.3691E-11 3.8825E-11 1.6120E-09 # lat0 lon0 xBary yBary zBary JD0 16.012238 34.379006 0.943029 0.101044 -0.352127 2456158.009978 # Heliocentric elements and errors Epoch: 2456150.5000 = 2012/08/11 Mean Anomaly: 351.65022 +/- 0.089 Argument of Peri: 34.33692 +/- 0.160 Long of Asc Node: 19.99193 +/- 0.000 Inclination: 53.83750 +/- 0.001 Eccentricity: 0.26356531 +/- 0.0001 Semi-Major Axis: 30.25614309 +/- 0.0023 Time of Perihelion: 2457560.4092 +/- 15.1 Perihelion: 22.28167331 +/- 0.0044 Aphelion: 38.23061286 +/- 0.0050 Period (y) 166.4288 +/- 0.02 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 18.33683363 +/- 0.0004 Ecliptic Y 11.40413863 +/- 0.0003 Ecliptic Z 6.08549167 +/- 0.0001 Ecliptic XDOT -0.00223488 +/- 0.0000 Ecliptic YDOT 0.00154731 +/- 0.0000 Ecliptic ZDOT 0.00303488 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 22.43495162 +/- 0.0004 Geocenter to KBO 22.05995663 +/- 0.0005 # Hcoef: 11.29
The following table shows the complete astrometric record for 12UW177. 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 (12UW177) followed by the observatory code and reference code for the source of the astrometry.
2012 08 18.50920 01 44 18.579 +27 58 04.51 12UW177 568 C~1Cs0 2012 08 18.54805 01 44 18.408 +27 58 06.59 12UW177 568 C~1Cs0 2012 08 24.41397 01 43 49.021 +28 02 51.73 25.3r 12UW177 568 C~1Cs0 2012 08 24.46174 01 43 48.738 +28 02 53.75 25.1r 12UW177 568 C~1Cs0 2012 09 12.40702 01 41 36.009 +28 13 31.82 12UW177 568 C~1Cs0 2012 09 14.44299 01 41 18.683 +28 14 13.77 24.8r 12UW177 568 C~1Cs0 2012 10 19.36875 01 35 24.993 +28 13 16.09 24.8r 12UW177 568 C~1Cs0 2012 10 19.41153 01 35 24.501 +28 13 15.20 24.9r 12UW177 568 C~1Cs0 2012 10 20.36078 01 35 14.193 +28 12 54.75 12UW177 568 C~1Cs0 2012 10 20.39925 01 35 13.761 +28 12 54.09 24.7r 12UW177 568 C~1Cs0 2012 10 20.43815 01 35 13.348 +28 12 53.15 24.2r 12UW177 568 C~1Cs0 2012 10 21.42228 01 35 02.614 +28 12 31.48 24.4r 12UW177 568 C~1Cs0 2012 11 14.35891 01 30 53.952 +27 59 52.07 12UW177 568 C~1Cs0 2013 01 14.22823 01 25 59.574 +27 25 52.26 24.5r 12UW177 568 C~1Cs0 2013 01 14.24065 01 25 59.581 +27 25 51.98 24.7r 12UW177 568 C~1Cs0 2013 02 03.30644 01 26 54.595 +27 24 52.38 12UW177 568 C~1Cs0 2013 02 06.25798 01 27 08.887 +27 25 23.01 24.9r 12UW177 568 C~1Cs0 2013 09 03.39524 01 48 02.91 +31 53 48.6 24.9r 12UW177 568 C~1Cs0 2013 09 03.42442 01 48 02.69 +31 53 50.0 25.3r 12UW177 568 C~1Cs0
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 0.02 0.00 0.08
2 0.0001 -1.33 0.16 2.77 0.07
3 0.0162 -256.43 0.28 412.27 0.14
4 0.0163 -259.15 0.04 415.54 0.04
5 0.0682 -1647.81 0.03 1665.13 -0.02
6 0.0737 -1844.08 -0.13 1790.35 -0.12
7 0.1694 -6186.43 -0.13 3528.67 0.01
8 0.1695 -6192.78 -0.35 3530.38 0.10
9 0.1721 -6326.40 -0.11 3564.57 -0.14
10 0.1722 -6331.93 -0.12 3566.19 0.05
11 0.1723 -6337.33 0.07 3567.45 -0.13
12 0.1750 -6476.62 -0.07 3602.76 0.30
13 0.2405 -9806.44 0.03 4200.12 -0.12
14 0.4072 -14221.33 0.12 3903.42 -0.13
15 0.4072 -14221.36 0.06 3903.13 -0.22
16 0.4621 -13572.56 0.02 3550.61 0.01
17 0.4702 -13385.26 0.14 3501.53 -0.10
18 1.0428 7928.85 0.02 12098.32 0.01
19 1.0429 7926.74 -0.04 12100.65 0.17
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.
12UW177 quality flag:3 Type: CENTAURR CENTAURR CENTAURR axisobj 30.260 30.291 30.229 ecceobj 0.263 0.264 0.262 incobj 53.786 53.783 53.788 qmin 19.323 19.256 20.190 qmax 41.166 41.627 41.062 amean 30.108 30.084 30.156 amin 29.787 29.360 29.653 amax 30.500 30.961 30.878 emean 0.198 0.213 0.225 emin 0.080 0.064 0.083 emax 0.356 0.348 0.334 imean 54.375 54.282 54.115 imin 52.337 52.587 52.913 imax 55.378 55.453 55.348 excite_mean 0.840 0.843 0.845 fracstop 0.144 0.215 0.183 cjmean 2.137 2.141 2.140 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 125.8 126.4 136.6 kozaiamp 81.1 79.5 81.5