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: 15VA170 # Created Mon Apr 28 01:10:42 2025 # Orbit generated from Bernstein formalism # Fitting 27 observations of 27 # Arc: 1.44y # First observation: 2015/08/20 # Last observation: 2017/01/27 Preliminary a, adot, b, bdot, g, gdot: -0.000140 0.023216 -0.000005 -0.000088 0.023729 0.000000 # Chi-squared of fit: 8.81 DOF: 48 RMS: 0.10 # Min/Max residuals: -0.27 0.40 # Exact a, adot, b, bdot, g, gdot: 1.543605E-05 2.281951E-02 -1.231312E-07 -8.835183E-05 2.350701E-02 1.535949E-03 # Covariance matrix: 3.7183E-13 1.1026E-13 8.1358E-15 -1.0256E-14 4.1849E-13 1.8642E-11 1.1026E-13 6.8746E-13 1.0919E-14 -1.8893E-14 5.5573E-13 3.4319E-11 8.1358E-15 1.0919E-14 1.3494E-13 -1.3891E-13 1.5806E-14 8.2284E-13 -1.0256E-14 -1.8893E-14 -1.3891E-13 2.3512E-13 -2.3043E-14 -1.4311E-12 4.1849E-13 5.5573E-13 1.5806E-14 -2.3043E-14 8.0940E-13 4.1870E-11 1.8642E-11 3.4319E-11 8.2284E-13 -1.4311E-12 4.1870E-11 2.5996E-09 # lat0 lon0 xBary yBary zBary JD0 -1.619348 54.291104 1.013343 -0.001294 -0.050443 2457255.056669 # Heliocentric elements and errors Epoch: 2457250.5000 = 2015/08/16 Mean Anomaly: 62.13681 +/- 0.816 Argument of Peri: 193.87629 +/- 1.054 Long of Asc Node: 152.16688 +/- 0.042 Inclination: 1.63827 +/- 0.000 Eccentricity: 0.04558940 +/- 0.0021 Semi-Major Axis: 43.45294584 +/- 0.0101 Time of Perihelion: 2439192.3311 +/- 237.1 Perihelion: 41.47195216 +/- 0.0923 Aphelion: 45.43393951 +/- 0.0924 Period (y) 286.4422 +/- 0.10 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 25.66778691 +/- 0.0010 Ecliptic Y 33.97817001 +/- 0.0013 Ecliptic Z -1.20214187 +/- 0.0000 Ecliptic XDOT -0.00205589 +/- 0.0000 Ecliptic YDOT 0.00168985 +/- 0.0000 Ecliptic ZDOT -0.00001529 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 42.60042802 +/- 0.0012 Geocenter to KBO 42.54049716 +/- 0.0016 # Hcoef: 8.50
The following table shows the complete astrometric record for 15VA170. 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 (15VA170) followed by the observatory code and reference code for the source of the astrometry.
2015 08 20.55588 03 29 21.305 +17 16 25.18 24.8w 15VA170 568 C~2nw4 2015 09 07.60452 03 29 16.482 +17 15 24.39 25.0w 15VA170 568 C~2nw4 2015 09 12.45550 03 29 10.054 +17 14 49.94 25.1w 15VA170 568 C~2nw4 2015 10 09.54258 03 27 57.970 +17 09 36.79 25.1w 15VA170 568 C~2nw4 2015 11 06.31779 03 25 57.146 +17 01 47.21 24.4r 15VA170 568 C~2nw4 2015 11 06.38117 03 25 56.832 +17 01 46.04 24.7r 15VA170 568 C~2nw4 2015 11 06.45191 03 25 56.476 +17 01 45.22 25.0r 15VA170 568 C~2nw4 2015 11 06.46851 03 25 56.386 +17 01 44.55 24.7r 15VA170 568 C~2nw4 2015 11 07.47269 03 25 51.531 +17 01 26.21 24.8w 15VA170 568 C~2nw4 2015 11 17.45383 03 25 02.538 +16 58 24.05 24.9w 15VA170 568 C~2nw4 2015 11 17.54213 03 25 02.092 +16 58 22.41 24.6w 15VA170 568 C~2nw4 2015 12 06.32006 03 23 32.063 +16 52 57.34 25.2w 15VA170 568 C~2nw4 2015 12 06.45375 03 23 31.424 +16 52 55.00 25.1w 15VA170 568 C~2nw4 2015 12 31.34139 03 21 53.978 +16 47 24.33 24.7w 15VA170 568 C~2nw4 2016 01 07.37071 03 21 33.939 +16 46 22.40 24.9w 15VA170 568 C~2nw4 2016 02 05.31732 03 20 57.583 +16 45 10.23 25.1w 15VA170 568 C~2nw4 2016 02 11.27002 03 21 00.104 +16 45 33.84 25.1w 15VA170 568 C~2nw4 2016 09 07.60255 03 34 36.682 +17 33 56.02 25.1w 15VA170 568 C~2nw4 2016 09 27.53124 03 33 58.031 +17 30 58.25 25.5w 15VA170 568 C~2nw4 2016 10 07.52165 03 33 26.557 +17 28 50.30 25.8w 15VA170 568 C~2nw4 2016 10 07.61708 03 33 26.206 +17 28 48.90 24.5w 15VA170 568 C~2nw4 2016 10 09.52198 03 33 19.414 +17 28 22.15 15VA170 568 C~2nw4 2016 10 09.59415 03 33 19.139 +17 28 21.09 25.3w 15VA170 568 C~2nw4 2016 11 02.47368 03 31 37.185 +17 21 55.00 24.9w 15VA170 568 C~2nw4 2016 11 04.44969 03 31 27.750 +17 21 20.32 24.8w 15VA170 568 C~2nw4 2016 12 24.35704 03 27 37.787 +17 08 02.31 25.4w 15VA170 568 C~2nw4 2017 01 27.32464 03 26 18.778 +17 04 22.87 24.8w 15VA170 568 C~2nw4
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 0.01
2 0.0494 -81.79 0.01 -42.16 -0.01
3 0.0627 -179.49 0.01 -53.18 -0.15
4 0.1369 -1257.59 0.06 -104.70 -0.14
5 0.2129 -3052.37 0.09 -133.47 -0.06
6 0.2131 -3057.02 0.04 -133.49 -0.08
7 0.2133 -3062.17 0.05 -133.03 0.40
8 0.2133 -3063.59 -0.16 -133.36 0.07
9 0.2161 -3135.61 0.01 -133.90 -0.01
10 0.2434 -3861.83 0.01 -136.08 0.02
11 0.2436 -3868.44 -0.05 -136.07 0.01
12 0.2950 -5201.26 0.04 -128.62 0.01
13 0.2954 -5210.73 -0.27 -128.59 -0.10
14 0.3635 -6649.16 -0.00 -96.96 -0.06
15 0.3828 -6943.58 0.17 -84.19 0.10
16 0.4620 -7467.64 0.08 -21.79 0.15
17 0.4783 -7426.58 -0.06 -8.12 -0.03
18 1.0515 4634.75 -0.05 -62.28 0.06
19 1.1060 4055.31 0.07 -104.05 -0.12
20 1.1334 3587.38 0.07 -121.34 -0.13
21 1.1336 3582.17 -0.06 -121.50 -0.16
22 1.1389 3481.39 0.10 -124.35 -0.04
23 1.1391 3477.31 0.01 -124.44 -0.03
24 1.2044 1967.87 -0.08 -150.28 0.06
25 1.2098 1828.41 -0.04 -151.47 0.01
26 1.3465 -1561.22 -0.08 -125.40 0.12
27 1.4395 -2713.24 0.06 -59.31 0.09
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.
15VA170 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.879 43.921 43.839 ecceobj 0.054 0.059 0.049 incobj 1.636 1.636 1.636 qmin 40.414 40.200 40.590 qmax 46.867 47.177 46.634 amean 43.539 43.580 43.501 amin 43.203 43.240 43.166 amax 43.894 43.933 43.852 emean 0.052 0.058 0.047 emin 0.033 0.038 0.028 emax 0.068 0.074 0.063 imean 2.157 2.171 2.144 imin 1.213 1.213 1.213 imax 2.877 2.891 2.859 excite_mean 0.064 0.069 0.060 fracstop 1.000 1.000 1.000 cjmean 3.091 3.091 3.091 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 182.2 182.0 182.6 kozaiamp 180.0 180.0 179.9