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: 17CH55 # Created Sun Dec 22 02:10:56 2024 # Orbit generated from Bernstein formalism # Fitting 19 observations of 19 # Arc: 4.08y # First observation: 2015/02/01 # Last observation: 2019/03/03 Preliminary a, adot, b, bdot, g, gdot: -0.000420 0.033990 -0.000043 0.002670 0.029608 0.000000 # Chi-squared of fit: 6.14 DOF: 32 RMS: 0.10 # Min/Max residuals: -0.18 0.23 # Exact a, adot, b, bdot, g, gdot: 1.826524E-05 3.356157E-02 1.665150E-06 2.646907E-03 2.911669E-02 -8.488622E-04 # Covariance matrix: 1.4404E-12 -1.0760E-12 7.1631E-14 -6.9311E-14 -3.6830E-13 -5.4439E-12 -1.0760E-12 1.1136E-12 -8.9157E-14 8.3653E-14 7.7192E-13 6.4589E-12 7.1631E-14 -8.9157E-14 5.9371E-13 -2.2426E-13 -7.4585E-14 -5.6366E-13 -6.9311E-14 8.3653E-14 -2.2426E-13 9.9272E-14 6.5501E-14 5.2903E-13 -3.6830E-13 7.7192E-13 -7.4585E-14 6.5501E-14 1.1825E-12 4.8605E-12 -5.4439E-12 6.4589E-12 -5.6366E-13 5.2903E-13 4.8605E-12 4.0854E-11 # lat0 lon0 xBary yBary zBary JD0 -11.898688 151.615672 0.332718 -0.190500 -0.904953 2457054.841114 # Heliocentric elements and errors Epoch: 2457050.5000 = 2015/01/28 Mean Anomaly: 352.44610 +/- 0.040 Argument of Peri: 302.10475 +/- 0.063 Long of Asc Node: 220.09233 +/- 0.002 Inclination: 12.38487 +/- 0.000 Eccentricity: 0.20235188 +/- 0.0001 Semi-Major Axis: 44.04662058 +/- 0.0071 Time of Perihelion: 2459290.9552 +/- 12.0 Perihelion: 35.13370428 +/- 0.0076 Aphelion: 52.95953687 +/- 0.0099 Period (y) 292.3325 +/- 0.07 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -30.22509869 +/- 0.0011 Ecliptic Y 16.70852563 +/- 0.0006 Ecliptic Z -7.08120469 +/- 0.0003 Ecliptic XDOT -0.00148042 +/- 0.0000 Ecliptic YDOT -0.00279460 +/- 0.0000 Ecliptic ZDOT 0.00026009 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 35.25443064 +/- 0.0010 Geocenter to KBO 34.34456126 +/- 0.0013 # Hcoef: 8.22
The following table shows the complete astrometric record for 17CH55. 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 (17CH55) followed by the observatory code and reference code for the source of the astrometry.
2015 02 01.340336 09 57 39.804 -00 14 12.77 23.5r 17CH55 W84 C~8HKI 2017 02 02.48497 10 12 25.10 -01 17 35.4 24.7r 17CH55 T09 C~7zpj 2017 02 02.49390 10 12 25.05 -01 17 35.3 24.3r 17CH55 T09 C~7zpj 2017 02 02.52929 10 12 24.87 -01 17 34.6 24.3r 17CH55 T09 C~7zpj 2017 02 21.43369 10 10 46.22 -01 08 59.2 23.6z 17CH55 T09 C~7zpj 2017 02 21.45915 10 10 46.08 -01 08 58.2 23.1z 17CH55 T09 C~7zpj 2017 02 21.46717 10 10 46.04 -01 08 58.2 22.8z 17CH55 T09 C~7zpj 2017 03 21.23864 10 08 27.51 -00 52 47.6 22.8y 17CH55 T09 C~7zpj 2017 03 21.27078 10 08 27.37 -00 52 46.4 22.6y 17CH55 T09 C~7zpj 2017 03 21.28559 10 08 27.29 -00 52 46.1 22.8y 17CH55 T09 C~7zpj 2017 03 21.30637 10 08 27.21 -00 52 45.4 23.2y 17CH55 T09 C~7zpj 2017 03 21.31825 10 08 27.15 -00 52 44.7 23.1y 17CH55 T09 C~7zpj 2017 03 29.26384 10 07 54.12 -00 47 53.9 25.0g 17CH55 T09 C~7zpj 2017 03 29.33389 10 07 53.83 -00 47 51.7 24.8g 17CH55 T09 C~7zpj 2017 03 29.35068 10 07 53.76 -00 47 51.0 25.0g 17CH55 T09 C~7zpj 2018 02 08.289204 10 19 24.809 -01 47 23.57 22.3z 17CH55 W84 C~8HKI 2019 02 04.461246 10 27 13.26 -02 20 55.1 17CH55 T09 C~86ur 2019 02 28.401640 10 25 09.26 -02 09 33.3 17CH55 T09 C~86ur 2019 03 03.333055 10 24 53.87 -02 07 53.7 17CH55 T09 C~86ur
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 -0.01 0.00 -0.05
2 2.0045 13790.17 -0.01 1081.67 0.07
3 2.0045 13789.43 -0.04 1081.50 -0.05
4 2.0046 13786.64 0.01 1081.21 -0.13
5 2.0564 12214.13 0.13 1047.17 0.05
6 2.0565 12211.80 0.02 1047.38 0.23
7 2.0565 12211.24 0.16 1047.17 0.01
8 2.1325 9918.82 -0.04 1230.55 0.10
9 2.1326 9916.43 0.02 1230.94 0.14
10 2.1326 9915.20 -0.09 1230.80 -0.16
11 2.1327 9913.82 0.13 1231.04 -0.14
12 2.1327 9912.73 -0.06 1231.38 0.07
13 2.1545 9345.71 -0.00 1330.69 0.20
14 2.1547 9340.85 -0.04 1331.24 -0.18
15 2.1547 9339.62 -0.11 1331.52 -0.11
16 3.0197 20357.49 -0.15 1604.44 -0.06
17 4.0085 27741.19 -0.09 2168.82 -0.02
18 4.0741 25728.14 0.03 2161.05 0.02
19 4.0821 25473.35 0.13 2174.18 -0.02
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.
17CH55 quality flag:2 Type: 7:4EEE SCATNEAR 7:4EEE axisobj 43.736 43.755 43.717 ecceobj 0.195 0.196 0.195 incobj 12.384 12.384 12.384 qmin 34.551 34.160 34.325 qmax 53.569 53.857 53.760 amean 43.726 43.753 43.726 amin 43.211 43.193 43.234 amax 44.334 44.334 44.282 emean 0.194 0.193 0.198 emin 0.181 0.164 0.179 emax 0.209 0.218 0.214 imean 13.635 13.827 13.529 imin 12.917 12.588 12.832 imax 14.375 15.128 14.243 excite_mean 0.306 0.307 0.306 fracstop 1.000 1.000 1.000 cjmean 2.986 2.985 2.985 libcent 0 183.0 -180.0 178.9 libamp 0 161.5 -180.0 158.6 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 187.4 181.4 176.5 kozaiamp 180.0 180.0 180.0