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: 13RW128
# Created Sun Nov 24 02:09:29 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 27 observations of 27
# Arc: 12.93y
# First observation: 2008/10/30
# Last observation: 2021/10/03
# Chi-squared of fit: 13.42 DOF: 48 RMS: 0.12
# Min/Max residuals: -0.29 0.33
# Exact a, adot, b, bdot, g, gdot:
1.656482E-05 2.376874E-02 9.788140E-07 1.398780E-03 2.400261E-02 -3.121465E-03
# Covariance matrix:
3.7579E-13 -1.1046E-13 1.3125E-14 -5.4397E-15 8.4656E-15 -2.3683E-13
-1.1046E-13 4.3087E-14 -5.5852E-15 2.3418E-15 -2.5302E-14 9.9333E-14
1.3125E-14 -5.5852E-15 1.5684E-13 -1.8249E-14 1.6886E-15 -1.4124E-14
-5.4397E-15 2.3418E-15 -1.8249E-14 3.1855E-15 -1.2464E-15 5.8437E-15
8.4656E-15 -2.5302E-14 1.6886E-15 -1.2464E-15 4.4182E-13 -1.0341E-15
-2.3683E-13 9.9333E-14 -1.4124E-14 5.8437E-15 -1.0341E-15 2.5539E-13
# lat0 lon0 xBary yBary zBary JD0
4.627461 -15.865778 -0.795962 0.048122 -0.594190 2454769.710974
# Heliocentric elements and errors
Epoch: 2454770.5000 = 2008/10/31
Mean Anomaly: 310.45323 +/- 0.027
Argument of Peri: 116.92105 +/- 0.035
Long of Asc Node: 290.74446 +/- 0.001
Inclination: 5.59887 +/- 0.000
Eccentricity: 0.13199774 +/- 0.0001
Semi-Major Axis: 45.65354796 +/- 0.0058
Time of Perihelion: 2470277.3328 +/- 20.4
Perihelion: 39.62738304 +/- 0.0056
Aphelion: 51.67971289 +/- 0.0070
Period (y) 308.4750 +/- 0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 40.73735469 +/- 0.0011
Ecliptic Y -10.75402095 +/- 0.0003
Ecliptic Z 3.36121170 +/- 0.0001
Ecliptic XDOT 0.00039338 +/- 0.0000
Ecliptic YDOT 0.00271086 +/- 0.0000
Ecliptic ZDOT 0.00013019 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.26682938 +/- 0.0011
Geocenter to KBO 41.66226680 +/- 0.0012
# Hcoef: 6.82
The following table shows the complete astrometric record for 13RW128. 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 (13RW128) followed by the observatory code and reference code for the source of the astrometry.
2008 10 30.21022 22 54 25.08 -01 58 11.2 23.0r 13RW128 645 C~4uua 2008 10 30.21105 22 54 25.08 -01 58 11.3 22.7i 13RW128 645 C~4uua 2008 10 30.21354 22 54 25.08 -01 58 11.3 23.6g 13RW128 645 C~4uua 2010 10 14.223166 23 05 07.42 -00 39 47.0 22.3I 13RW128 568 C~4uua 2010 10 14.280722 23 05 07.21 -00 39 48.3 22.3I 13RW128 568 C~4uua 2010 10 14.328617 23 05 07.03 -00 39 49.5 22.2I 13RW128 568 C~4uua 2012 11 03.155925 23 14 09.28 +00 25 32.1 22.9z 13RW128 W84 C~4uua 2012 11 03.172406 23 14 09.24 +00 25 31.8 22.8z 13RW128 W84 C~4uua 2012 11 05.107280 23 14 04.96 +00 24 53.4 22.7r 13RW128 W84 C~4uua 2012 11 05.122407 23 14 04.93 +00 24 53.1 22.8r 13RW128 W84 C~4uua 2013 09 10.287170 23 22 36.074 +01 26 24.75 23.8g 13RW128 W84 C~3wor 2013 09 30.094775 23 21 08.976 +01 17 01.71 22.9r 13RW128 W84 C~3wor 2013 09 30.105423 23 21 08.933 +01 17 01.29 22.6i 13RW128 W84 C~3wor 2013 10 11.105180 23 20 24.527 +01 11 50.66 22.5z 13RW128 W84 C~3wor 2013 10 13.043930 23 20 17.226 +01 10 57.58 22.3z 13RW128 W84 C~3wor 2013 10 13.068316 23 20 17.132 +01 10 56.95 22.8i 13RW128 W84 C~3wor 2013 10 28.016522 23 19 27.644 +01 04 36.68 23.0i 13RW128 W84 C~3wor 2013 11 08.119219 23 19 00.365 +01 00 40.30 23.0r 13RW128 W84 C~3wor 2013 11 22.047761 23 18 40.066 +00 56 59.43 23.7g 13RW128 W84 C~3wor 2013 12 12.039045 23 18 40.937 +00 54 40.49 13RW128 W84 C~3wor 2016 08 12.296382 23 39 57.45 +03 29 10.5 23.8g 13RW128 W84 C~4uua 2016 08 12.298171 23 39 57.44 +03 29 10.5 23.8g 13RW128 W84 C~4uua 2021 09 12.306210 00 04 11.228 +06 25 14.70 23.1G 13RW128 G37 C~55Nb 2021 09 12.366480 00 04 10.967 +06 25 13.18 13RW128 G37 C~55Nb 2021 10 03.156360 00 02 36.770 +06 15 19.74 23.0G 13RW128 G37 C~55Nb 2021 10 03.209520 00 02 36.529 +06 15 18.25 13RW128 G37 C~55Nb 2021 10 03.262270 00 02 36.287 +06 15 16.56 13RW128 G37 C~55Nb
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 -0.17 0.00 -0.08
2 0.0000 0.00 -0.14 0.00 -0.17
3 0.0000 0.00 -0.06 0.00 -0.12
4 1.9549 0.00 0.33 0.00 -0.02
5 1.9550 0.00 0.21 0.00 0.14
6 1.9551 0.00 0.05 0.00 0.16
7 4.0108 0.00 0.13 0.00 0.02
8 4.0108 0.00 0.11 0.00 0.05
9 4.0161 0.00 0.16 0.00 0.04
10 4.0162 0.00 0.21 0.00 0.04
11 4.8626 0.00 -0.06 0.00 -0.04
12 4.9169 0.00 -0.02 0.00 0.13
13 4.9169 0.00 0.02 0.00 0.02
14 4.9470 0.00 -0.13 0.00 0.02
15 4.9523 0.00 -0.09 0.00 0.02
16 4.9524 0.00 -0.11 0.00 0.05
17 4.9933 0.00 -0.05 0.00 0.06
18 5.0237 0.00 -0.29 0.00 0.07
19 5.0618 0.00 -0.23 0.00 0.11
20 5.1166 0.00 -0.00 0.00 -0.08
21 7.7839 0.00 0.07 0.00 -0.29
22 7.7840 0.00 0.02 0.00 -0.26
23 12.8682 0.00 -0.07 0.00 -0.01
24 12.8683 0.00 0.11 0.00 0.06
25 12.9252 0.00 -0.01 0.00 -0.02
26 12.9254 0.00 0.01 0.00 0.08
27 12.9255 0.00 -0.01 0.00 -0.03
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.
13RW128 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 45.731 45.730 45.731 ecceobj 0.136 0.136 0.136 incobj 5.612 5.612 5.612 qmin 38.606 38.615 38.591 qmax 52.628 52.671 52.724 amean 45.484 45.489 45.493 amin 45.097 45.097 45.090 amax 45.920 45.931 45.934 emean 0.132 0.132 0.132 emin 0.116 0.116 0.116 emax 0.148 0.148 0.148 imean 7.224 7.202 7.187 imin 6.595 6.520 6.518 imax 7.842 7.842 7.837 excite_mean 0.182 0.182 0.182 fracstop 1.000 1.000 1.000 cjmean 3.079 3.079 3.079 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 182.9 183.4 182.1 kozaiamp 180.0 180.0 180.0