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: 187661 # Created Wed Mar 26 01:07:00 2025 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 47 observations of 47 # Arc: 17.46y # First observation: 2002/04/10 # Last observation: 2019/09/26 # Chi-squared of fit: 117.15 DOF: 88 RMS: 0.28 # Min/Max residuals: -0.90 0.84 # Exact a, adot, b, bdot, g, gdot: 3.047122E-05 1.175156E-01 -1.072908E-05 -5.439464E-02 7.004245E-02 -2.555421E-02 # Covariance matrix: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 # lat0 lon0 xBary yBary zBary JD0 23.958516 -156.479901 0.050949 0.407295 -0.916825 2452374.914373 # Heliocentric elements and errors Epoch: 2452374.5000 = 2002/04/10 Mean Anomaly: 344.71092 +/- 0.000 Argument of Peri: 173.51551 +/- 0.000 Long of Asc Node: 62.48666 +/- 0.000 Inclination: 33.14827 +/- 0.000 Eccentricity: 0.40418235 +/- 0.0000 Semi-Major Axis: 23.96863840 +/- 0.0000 Time of Perihelion: 2454194.7968 +/- 0.0 Perihelion: 14.28093787 +/- 0.0000 Aphelion: 33.65633892 +/- 0.0000 Period (y) 117.3473 +/- 0.00 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -12.90239697 +/- 0.0000 Ecliptic Y -5.55520891 +/- 0.0000 Ecliptic Z 5.79745439 +/- 0.0000 Ecliptic XDOT 0.00187009 +/- 0.0000 Ecliptic YDOT -0.00419356 +/- 0.0000 Ecliptic ZDOT -0.00234841 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 15.19687573 +/- 0.0000 Geocenter to KBO 14.27717466 +/- 0.0000 # Hcoef: 9.16
The following table shows the complete astrometric record for 187661. 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 (187661) followed by the observatory code and reference code for the source of the astrometry.
2002 04 10.41363 14 02 31.02 +13 09 00.3 20.6R 187661 644 Cv3892 2002 07 30.17412 13 50 43.70 +11 19 38.7 20.9R 187661 644 Cv3892 2003 04 27.202110 14 20 04.500 +07 43 28.55 20.8V 187661 645 Cv3892 2003 04 27.205582 14 20 04.454 +07 43 28.59 21.7 187661 645 Cv3892 2003 04 27.336130 14 20 02.782 +07 43 31.61 21.2V 187661 645 Cv3171 2003 04 27.339602 14 20 02.740 +07 43 31.66 22.0 187661 645 Cv3171 2003 04 28.338120 14 19 50.124 +07 43 53.60 21.0V 187661 645 Cv3892 2003 04 28.341592 14 19 50.078 +07 43 53.66 21.9 187661 645 Cv3892 2004 03 30.42019 14 46 42.30 +01 33 48.4 187661 675 Cv3171 2004 03 31.41478 14 46 32.39 +01 34 34.4 187661 675 Cv3171 2004 04 13.26172 14 44 11.11 +01 43 34.7 20.4R 187661 675 Cv3171 2004 04 13.33158 14 44 10.26 +01 43 37.7 20.6R 187661 675 Cv3171 2004 04 13.40123 14 44 09.42 +01 43 40.0 20.3R 187661 675 Cv3171 2004 04 16.28798 14 43 34.87 +01 45 25.8 20.5R 187661 675 Cv3171 2004 04 16.35432 14 43 34.04 +01 45 28.2 21.2R 187661 675 Cv3171 2004 04 16.41685 14 43 33.27 +01 45 30.3 20.6R 187661 675 Cv3171 2006 04 29.29690 15 25 58.35 -10 25 04.1 20.7V 187661 691 Cv3171 2006 04 29.31428 15 25 58.12 -10 25 03.6 20.5V 187661 691 Cv3171 2006 04 29.33168 15 25 57.90 -10 25 03.5 20.8V 187661 691 Cv3171 2006 05 07.26925 15 24 13.92 -10 23 40.5 20.9V 187661 691 Cv3171 2006 05 07.28660 15 24 13.70 -10 23 40.3 20.8V 187661 691 Cv3171 2006 05 07.30402 15 24 13.46 -10 23 40.2 20.7V 187661 691 Cv3171 2006 05 30.25066 15 19 09.33 -10 23 01.1 20.2V 187661 G96 Cv3171 2006 05 30.25727 15 19 09.26 -10 23 01.3 20.2V 187661 G96 Cv3171 2006 05 30.26385 15 19 09.19 -10 23 01.5 20.4V 187661 G96 Cv3171 2006 05 30.27043 15 19 09.08 -10 23 01.2 20.3V 187661 G96 Cv3171 2007 04 18.44327 15 52 19.08 -16 31 59.9 20.9V 187661 691 Cv2441 2007 04 18.46088 15 52 18.86 -16 32 00.1 21.1V 187661 691 Cv2441 2007 04 18.47852 15 52 18.66 -16 32 00.1 21.5V 187661 691 Cv2441 2007 04 22.45334 15 51 33.91 -16 32 11.3 20.9V 187661 691 Cv2441 2007 04 22.47293 15 51 33.63 -16 32 11.6 20.7V 187661 691 Cv2441 2007 04 22.49202 15 51 33.42 -16 32 11.6 21.2V 187661 691 Cv2441 2007 05 10.35502 15 47 46.18 -16 32 32.7 20.6R 187661 675 C60235 2007 05 10.39789 15 47 45.54 -16 32 32.5 20.5R 187661 675 C60235 2007 05 11.28579 15 47 33.51 -16 32 33.0 20.7R 187661 675 C60235 2007 05 11.33020 15 47 32.90 -16 32 33.3 20.5R 187661 675 C60235 2007 05 12.36979 15 47 18.67 -16 32 33.7 20.9V 187661 691 Cv2661 2007 05 12.38741 15 47 18.44 -16 32 33.8 21.0V 187661 691 Cv2661 2007 05 12.40504 15 47 18.20 -16 32 33.4 21.3V 187661 691 Cv2661 2008 03 04.53562 16 20 59.16 -21 55 21.51 187661 675 Cy2205 2008 03 10.52644 16 21 06.64 -22 00 13.39 187661 675 Cy2205 2008 05 08.35568 16 13 44.94 -22 29 13.9 20.0V 187661 G96 Cy9015 2008 05 08.36194 16 13 44.90 -22 29 13.8 20.0V 187661 G96 Cy9015 2008 05 08.36822 16 13 44.79 -22 29 14.2 20.1V 187661 G96 Cy9015 2008 05 08.37451 16 13 44.68 -22 29 14.2 19.8V 187661 G96 Cy9015 2019 09 26.06524 21 46 48.82 -48 27 30.2 21.3G 187661 X01 C~3ofe 2019 09 26.13122 21 46 48.12 -48 27 27.8 21.7G 187661 X01 C~3ofe
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 -0.90 0.00 0.01
2 0.3032 0.00 0.26 0.00 -0.14
3 1.0453 0.00 -0.04 0.00 -0.11
4 1.0453 0.00 -0.06 0.00 -0.15
5 1.0456 0.00 0.01 0.00 -0.12
6 1.0457 0.00 0.05 0.00 -0.15
7 1.0484 0.00 -0.02 0.00 -0.09
8 1.0484 0.00 -0.04 0.00 -0.10
9 1.9713 0.00 -0.71 0.00 0.33
10 1.9740 0.00 -0.46 0.00 0.84
11 2.0092 0.00 0.43 0.00 -0.24
12 2.0094 0.00 0.28 0.00 0.11
13 2.0095 0.00 0.27 0.00 -0.22
14 2.0175 0.00 0.32 0.00 -0.01
15 2.0176 0.00 0.14 0.00 0.05
16 2.0178 0.00 0.17 0.00 -0.05
17 4.0517 0.00 0.40 0.00 -0.15
18 4.0517 0.00 0.35 0.00 0.15
19 4.0518 0.00 0.46 0.00 0.04
20 4.0735 0.00 0.16 0.00 0.25
21 4.0736 0.00 0.38 0.00 0.30
22 4.0736 0.00 0.32 0.00 0.25
23 4.1364 0.00 -0.29 0.00 -0.01
24 4.1365 0.00 -0.05 0.00 -0.16
25 4.1365 0.00 0.17 0.00 -0.32
26 4.1365 0.00 -0.20 0.00 0.03
27 5.0213 0.00 0.00 0.00 -0.08
28 5.0213 0.00 -0.35 0.00 -0.23
29 5.0214 0.00 -0.41 0.00 -0.17
30 5.0323 0.00 0.14 0.00 0.30
31 5.0323 0.00 -0.59 0.00 0.04
32 5.0324 0.00 -0.36 0.00 0.07
33 5.0813 0.00 0.49 0.00 -0.31
34 5.0814 0.00 -0.23 0.00 -0.09
35 5.0838 0.00 -0.07 0.00 0.01
36 5.0840 0.00 0.00 0.00 -0.25
37 5.0868 0.00 -0.46 0.00 0.10
38 5.0869 0.00 -0.24 0.00 0.01
39 5.0869 0.00 -0.16 0.00 0.41
40 5.9004 0.00 0.26 0.00 0.20
41 5.9168 0.00 0.00 0.00 -0.36
42 6.0779 0.00 -0.18 0.00 -0.01
43 6.0779 0.00 0.51 0.00 0.18
44 6.0779 0.00 0.14 0.00 -0.13
45 6.0779 0.00 -0.22 0.00 -0.04
46 17.4611 0.00 0.35 0.00 0.03
47 17.4612 0.00 -0.32 0.00 -0.16
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.
187661 quality flag:3 Type: CENTAURR CENTAURR CENTAURR axisobj 23.836 23.836 23.836 ecceobj 0.402 0.402 0.402 incobj 33.155 33.155 33.155 qmin 13.191 13.147 13.070 qmax 35.797 35.415 35.573 amean 24.065 24.067 24.076 amin 23.680 23.683 23.778 amax 24.572 24.414 24.458 emean 0.438 0.438 0.439 emin 0.402 0.402 0.402 emax 0.457 0.454 0.457 imean 31.323 31.691 31.498 imin 30.849 30.812 30.535 imax 32.059 32.875 32.600 excite_mean 0.680 0.684 0.682 fracstop 0.021 0.023 0.024 cjmean 2.616 2.611 2.613 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 182.4 181.8 180.4 kozaiamp 27.9 25.1 23.4