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: 15VL171 # Created Sun Apr 27 01:10:42 2025 # Orbit generated from Bernstein formalism # Fitting 27 observations of 27 # Arc: 2.04y # First observation: 2015/09/07 # Last observation: 2017/09/22 Preliminary a, adot, b, bdot, g, gdot: -0.000098 0.019852 -0.000002 0.000245 0.021527 0.000000 # Chi-squared of fit: 3.30 DOF: 48 RMS: 0.06 # Min/Max residuals: -0.11 0.15 # Exact a, adot, b, bdot, g, gdot: 1.476568E-05 1.968963E-02 4.559769E-07 2.431300E-04 2.148519E-02 -4.722795E-04 # Covariance matrix: 2.5893E-13 -4.3749E-14 1.4600E-15 5.6052E-16 1.8752E-13 3.0836E-12 -4.3749E-14 3.5280E-13 5.9711E-16 2.5619E-15 1.7025E-13 9.2300E-12 1.4600E-15 5.9711E-16 1.1735E-13 -9.6623E-14 1.9613E-15 3.4041E-14 5.6052E-16 2.5619E-15 -9.6623E-14 1.4657E-13 2.0065E-15 1.1411E-13 1.8752E-13 1.7025E-13 1.9613E-15 2.0065E-15 3.0218E-13 8.4246E-12 3.0836E-12 9.2300E-12 3.4041E-14 1.1411E-13 8.4246E-12 4.1705E-10 # lat0 lon0 xBary yBary zBary JD0 -1.460158 51.974530 0.933496 -0.009747 -0.388215 2457273.133899 # Heliocentric elements and errors Epoch: 2457270.5000 = 2015/09/05 Mean Anomaly: 269.49313 +/- 0.140 Argument of Peri: 30.88340 +/- 0.129 Long of Asc Node: 115.74599 +/- 0.036 Inclination: 1.59865 +/- 0.000 Eccentricity: 0.04634923 +/- 0.0010 Semi-Major Axis: 46.81917324 +/- 0.0055 Time of Perihelion: 2486688.4948 +/- 45.3 Perihelion: 44.64914047 +/- 0.0486 Aphelion: 48.98920601 +/- 0.0486 Period (y) 320.3641 +/- 0.06 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 29.63260638 +/- 0.0007 Ecliptic Y 36.38294037 +/- 0.0009 Ecliptic Z -1.18598915 +/- 0.0000 Ecliptic XDOT -0.00201491 +/- 0.0000 Ecliptic YDOT 0.00149241 +/- 0.0000 Ecliptic ZDOT 0.00003256 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 46.93843074 +/- 0.0009 Geocenter to KBO 46.54369668 +/- 0.0012 # Hcoef: 7.66
The following table shows the complete astrometric record for 15VL171. 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 (15VL171) followed by the observatory code and reference code for the source of the astrometry.
2015 09 07.63311 03 19 48.365 +16 50 59.10 24.7w 15VL171 568 C~2nw9 2015 09 12.49674 03 19 41.385 +16 50 24.55 24.4w 15VL171 568 C~2nw9 2015 10 07.54436 03 18 37.684 +16 45 46.78 24.5w 15VL171 568 C~2nw9 2015 10 07.60373 03 18 37.480 +16 45 46.11 24.6w 15VL171 568 C~2nw9 2015 11 07.33788 03 16 33.844 +16 37 31.19 23.7r 15VL171 568 C~2nw9 2015 11 07.38006 03 16 33.661 +16 37 30.54 24.0r 15VL171 568 C~2nw9 2015 11 07.42224 03 16 33.472 +16 37 29.74 24.1r 15VL171 568 C~2nw9 2015 11 10.50536 03 16 19.683 +16 36 36.26 24.7w 15VL171 568 C~2nw9 2015 11 17.35218 03 15 48.977 +16 34 38.03 24.5w 15VL171 568 C~2nw9 2015 11 17.39878 03 15 48.768 +16 34 37.23 24.4w 15VL171 568 C~2nw9 2015 12 06.36096 03 14 26.711 +16 29 28.73 24.6w 15VL171 568 C~2nw9 2015 12 06.49848 03 14 26.146 +16 29 26.60 24.3w 15VL171 568 C~2nw9 2016 01 01.34872 03 12 57.383 +16 24 12.33 24.6w 15VL171 568 C~2nw9 2016 01 07.41130 03 12 42.655 +16 23 24.87 24.9w 15VL171 568 C~2nw9 2016 02 05.28768 03 12 13.724 +16 22 28.63 24.8w 15VL171 568 C~2nw9 2016 02 10.30807 03 12 16.140 +16 22 48.89 25.0w 15VL171 568 C~2nw9 2016 09 07.62568 03 24 20.253 +17 08 50.63 15VL171 568 C~2nw9 2016 09 26.58416 03 23 43.142 +17 06 04.00 24.5w 15VL171 568 C~2nw9 2016 10 09.54522 03 23 03.227 +17 03 20.10 24.6w 15VL171 568 C~2nw9 2016 10 09.61729 03 23 02.957 +17 03 19.09 24.8w 15VL171 568 C~2nw9 2016 11 02.51995 03 21 27.397 +16 57 05.24 24.6w 15VL171 568 C~2nw9 2016 11 04.39506 03 21 19.139 +16 56 33.73 24.6w 15VL171 568 C~2nw9 2016 12 24.33186 03 17 51.703 +16 43 58.59 24.6w 15VL171 568 C~2nw9 2017 01 02.43457 03 17 25.097 +16 42 30.89 24.8w 15VL171 568 C~2nw9 2017 01 27.28684 03 16 44.703 +16 40 42.72 24.7w 15VL171 568 C~2nw9 2017 09 15.58250 03 28 42.957 +17 25 31.87 24.7w 15VL171 568 C~2nw9 2017 09 22.56874 03 28 28.848 +17 24 30.47 24.7w 15VL171 568 C~2nw9
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 -0.06 0.00 -0.06
2 0.0133 -105.71 -0.04 -7.73 0.03
3 0.0819 -1061.10 0.02 -41.27 -0.04
4 0.0821 -1064.11 0.07 -41.16 0.11
5 0.1662 -2908.23 -0.07 -59.66 0.03
6 0.1663 -2910.94 0.05 -59.60 0.07
7 0.1664 -2913.77 0.06 -59.67 -0.00
8 0.1749 -3119.10 -0.11 -59.76 0.01
9 0.1936 -3576.19 -0.05 -58.89 -0.00
10 0.1937 -3579.30 -0.00 -58.88 -0.02
11 0.2457 -4799.38 0.00 -47.85 0.03
12 0.2460 -4807.78 0.06 -47.77 -0.04
13 0.3168 -6123.36 0.09 -14.58 -0.02
14 0.3334 -6340.50 0.11 -4.30 0.02
15 0.4125 -6757.29 -0.11 51.77 -0.07
16 0.4262 -6718.35 -0.07 62.10 -0.10
17 1.0020 4044.88 -0.01 48.93 0.07
18 1.0539 3487.92 -0.05 21.06 -0.06
19 1.0894 2892.62 0.15 6.44 0.04
20 1.0896 2888.62 -0.05 6.43 0.10
21 1.1551 1467.73 0.07 -8.43 -0.05
22 1.1602 1345.11 0.01 -8.79 -0.00
23 1.2969 -1727.15 -0.06 24.55 -0.05
24 1.3218 -2119.08 -0.04 38.70 0.03
25 1.3899 -2707.73 0.03 84.75 -0.05
26 2.0231 7941.59 -0.09 87.04 0.06
27 2.0423 7730.47 0.06 77.00 -0.04
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.
15VL171 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 47.264 47.277 47.251 ecceobj 0.042 0.043 0.040 incobj 1.600 1.600 1.599 qmin 44.023 43.946 44.088 qmax 49.963 50.071 49.871 amean 46.906 46.919 46.893 amin 46.535 46.546 46.516 amax 47.295 47.306 47.289 emean 0.045 0.046 0.044 emin 0.033 0.034 0.031 emax 0.057 0.059 0.055 imean 0.525 0.524 0.526 imin 0.180 0.179 0.182 imax 0.802 0.802 0.803 excite_mean 0.046 0.047 0.045 fracstop 1.000 1.000 1.000 cjmean 3.135 3.135 3.135 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 185.5 185.6 185.6 kozaiamp 180.0 180.0 180.0