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: 17EW51 # Created Mon Jul 7 01:11:30 2025 # Orbit generated from Bernstein formalism # Fitting 32 observations of 32 # Arc: 2.02y # First observation: 2016/01/09 # Last observation: 2018/01/17 Preliminary a, adot, b, bdot, g, gdot: -0.000002 0.026362 0.000000 0.005029 0.026211 0.000000 # Chi-squared of fit: 14.94 DOF: 58 RMS: 0.12 # Min/Max residuals: -0.23 0.28 # Exact a, adot, b, bdot, g, gdot: 1.640882E-05 2.619794E-02 3.110550E-06 5.002482E-03 2.605398E-02 -1.187225E-03 # Covariance matrix: 2.8993E-13 -4.1938E-13 1.4291E-14 -5.0006E-14 -1.7588E-13 -5.2575E-12 -4.1938E-13 3.1854E-12 -1.4480E-13 5.5477E-13 2.9028E-12 5.7297E-11 1.4291E-14 -1.4480E-13 2.2809E-13 -1.8307E-13 -1.3510E-13 -2.7363E-12 -5.0006E-14 5.5477E-13 -1.8307E-13 2.4076E-13 5.2527E-13 1.0451E-11 -1.7588E-13 2.9028E-12 -1.3510E-13 5.2527E-13 2.8870E-12 5.4100E-11 -5.2575E-12 5.7297E-11 -2.7363E-12 1.0451E-11 5.4100E-11 1.0800E-09 # lat0 lon0 xBary yBary zBary JD0 -10.880227 151.231588 0.669966 -0.135758 -0.707280 2457397.101802 # Heliocentric elements and errors Epoch: 2457390.5000 = 2016/01/03 Mean Anomaly: 309.55044 +/- 0.388 Argument of Peri: 11.85273 +/- 0.513 Long of Asc Node: 194.92441 +/- 0.003 Inclination: 15.01030 +/- 0.001 Eccentricity: 0.07583341 +/- 0.0011 Semi-Major Axis: 40.92445740 +/- 0.0104 Time of Perihelion: 2470791.2074 +/- 102.9 Perihelion: 37.82101607 +/- 0.0458 Aphelion: 44.02789874 +/- 0.0461 Period (y) 261.8078 +/- 0.10 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -33.35259168 +/- 0.0022 Ecliptic Y 19.07187103 +/- 0.0012 Ecliptic Z -7.24473214 +/- 0.0005 Ecliptic XDOT -0.00130528 +/- 0.0000 Ecliptic YDOT -0.00243131 +/- 0.0000 Ecliptic ZDOT 0.00053980 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 39.09754187 +/- 0.0019 Geocenter to KBO 38.38184455 +/- 0.0025 # Hcoef: 8.46
The following table shows the complete astrometric record for 17EW51. 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 (17EW51) followed by the observatory code and reference code for the source of the astrometry.
2016 01 09.601013 09 57 40.52 +00 50 56.2 17EW51 T09 C~81By 2016 01 09.61640 09 57 40.48 +00 50 56.5 23.6y 17EW51 T09 C~8vIg 2016 01 09.630864 09 57 40.42 +00 50 56.3 17EW51 T09 C~81By 2016 01 09.64511 09 57 40.35 +00 50 56.5 23.8y 17EW51 T09 C~8vIg 2016 01 09.659433 09 57 40.32 +00 50 56.8 17EW51 T09 C~81By 2017 01 23.36852 10 02 46.25 +00 38 58.0 24.4r 17EW51 T09 C~7xU7 2017 01 23.44815 10 02 45.89 +00 38 59.6 24.6r 17EW51 T09 C~7xU7 2017 01 23.52648 10 02 45.54 +00 39 00.9 23.9i 17EW51 T09 C~7xU7 2017 03 04.31803 09 59 36.25 +00 56 55.3 23.7z 17EW51 T09 C~7xU7 2017 03 04.34360 09 59 36.14 +00 56 56.0 23.6z 17EW51 T09 C~7xU7 2017 03 04.47782 09 59 35.49 +00 57 00.3 24.2i 17EW51 T09 C~7xU7 2017 03 04.49952 09 59 35.39 +00 57 00.8 23.8i 17EW51 T09 C~7xU7 2017 03 22.29763 09 58 18.47 +01 06 59.1 25.5g 17EW51 T09 C~8vIg 2017 03 22.31149 09 58 18.41 +01 06 59.6 25.3g 17EW51 T09 C~8vIg 2017 03 22.31628 09 58 18.40 +01 06 59.6 25.5g 17EW51 T09 C~8vIg 2017 03 22.33317 09 58 18.34 +01 07 00.3 25.4g 17EW51 T09 C~8vIg 2017 03 22.35008 09 58 18.26 +01 07 00.6 25.1g 17EW51 T09 C~8vIg 2017 03 22.39100 09 58 18.11 +01 07 02.1 23.7z 17EW51 T09 C~7xU7 2017 03 22.41670 09 58 18.01 +01 07 02.8 23.9z 17EW51 T09 C~7xU7 2017 03 22.44235 09 58 17.89 +01 07 04.0 23.9z 17EW51 T09 C~7xU7 2017 03 22.46802 09 58 17.80 +01 07 04.8 23.9z 17EW51 T09 C~7xU7 2017 03 22.48979 09 58 17.72 +01 07 05.6 23.6z 17EW51 T09 C~7xU7 2017 03 24.180277 09 58 11.246 +01 08 02.87 24.8V 17EW51 W84 C~8HKi 2017 03 25.24634 09 58 07.29 +01 08 38.0 24.6r 17EW51 T09 C~7xU7 2017 03 25.26003 09 58 07.22 +01 08 38.4 24.5r 17EW51 T09 C~7xU7 2017 03 25.27375 09 58 07.18 +01 08 39.0 24.4r 17EW51 T09 C~7xU7 2017 03 25.28747 09 58 07.12 +01 08 39.4 25.0r 17EW51 T09 C~7xU7 2018 01 17.46122 10 09 16.28 +00 21 43.2 24.2i 17EW51 T09 C~81By 2018 01 17.48332 10 09 16.19 +00 21 43.6 23.8i 17EW51 T09 C~81Bz 2018 01 17.53998 10 09 15.97 +00 21 44.4 24.3i 17EW51 T09 C~81Bz 2018 01 17.54803 10 09 15.94 +00 21 44.6 24.0i 17EW51 T09 C~81Bz 2018 01 17.59901 10 09 15.72 +00 21 45.2 24.0i 17EW51 T09 C~81Bz
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 -0.10 0.00 -0.02
2 0.0000 -0.67 0.08 0.07 0.21
3 0.0001 -1.44 0.11 -0.43 -0.16
4 0.0001 -2.49 -0.16 -0.61 -0.20
5 0.0002 -3.02 0.10 -0.48 0.06
6 1.0397 4548.79 0.14 926.80 0.05
7 1.0400 4543.16 -0.03 926.41 0.13
8 1.0402 4537.79 -0.03 925.80 -0.03
9 1.1491 1501.53 -0.23 941.96 0.22
10 1.1492 1499.74 -0.02 942.04 0.15
11 1.1496 1489.10 -0.12 942.67 -0.02
12 1.1496 1487.52 -0.00 942.62 -0.20
13 1.1983 197.63 -0.10 1100.95 0.03
14 1.1984 196.62 -0.18 1101.11 0.04
15 1.1984 196.48 0.00 1101.05 -0.07
16 1.1984 195.39 0.06 1101.39 0.09
17 1.1985 194.16 -0.03 1101.26 -0.23
18 1.1986 191.53 0.11 1101.88 -0.05
19 1.1987 189.88 0.19 1102.01 -0.19
20 1.1987 187.77 -0.19 1102.51 0.03
21 1.1988 186.23 -0.00 1102.79 0.03
22 1.1989 184.82 0.05 1103.12 0.12
23 1.2035 73.85 -0.17 1122.93 0.28
24 1.2064 6.00 0.27 1135.17 -0.00
25 1.2065 4.88 0.03 1135.18 -0.15
26 1.2065 4.10 0.15 1135.53 0.04
27 1.2065 3.12 0.06 1135.59 -0.06
28 2.0229 10400.53 0.00 2001.10 -0.06
29 2.0229 10399.12 -0.04 2001.00 -0.00
30 2.0231 10395.74 0.07 2000.60 0.00
31 2.0231 10395.25 0.08 2000.63 0.09
32 2.0233 10391.94 -0.08 2000.04 -0.13
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.
17EW51 quality flag:3 Type: SCATEXTD SCATEXTD SCATEXTD axisobj 40.695 40.713 40.678 ecceobj 0.069 0.071 0.067 incobj 15.051 15.052 15.050 qmin 37.011 37.033 37.177 qmax 44.585 44.663 44.376 amean 40.698 40.742 40.692 amin 40.331 40.430 40.352 amax 41.062 41.079 41.047 emean 0.066 0.071 0.061 emin 0.047 0.054 0.039 emax 0.087 0.088 0.083 imean 15.843 15.878 15.850 imin 14.792 14.841 14.797 imax 16.774 16.822 16.774 excite_mean 0.281 0.283 0.280 fracstop 1.000 1.000 1.000 cjmean 2.971 2.970 2.971 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 180.5 174.8 179.9 kozaiamp 180.0 179.9 180.0