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: 15VD171 # Created Mon Apr 28 01:10:42 2025 # Orbit generated from Bernstein formalism # Fitting 29 observations of 29 # Arc: 2.27y # First observation: 2015/09/07 # Last observation: 2017/12/16 Preliminary a, adot, b, bdot, g, gdot: -0.000079 0.024270 -0.000001 -0.001129 0.023956 0.000000 # Chi-squared of fit: 8.29 DOF: 52 RMS: 0.09 # Min/Max residuals: -0.23 0.28 # Exact a, adot, b, bdot, g, gdot: 1.622733E-05 2.406389E-02 -9.205130E-07 -1.118855E-03 2.386977E-02 -8.130243E-04 # Covariance matrix: 2.3292E-13 2.3349E-15 2.1827E-15 -6.1260E-15 1.7621E-13 2.6550E-12 2.3349E-15 3.4373E-13 5.1292E-15 -1.8765E-14 2.1640E-13 8.1537E-12 2.1827E-15 5.1292E-15 1.1126E-13 -8.2667E-14 5.1024E-15 1.7808E-13 -6.1260E-15 -1.8765E-14 -8.2667E-14 1.1180E-13 -1.6672E-14 -6.5763E-13 1.7621E-13 2.1640E-13 5.1024E-15 -1.6672E-14 3.0554E-13 7.2369E-12 2.6550E-12 8.1537E-12 1.7808E-13 -6.5763E-13 7.2369E-12 2.8577E-10 # lat0 lon0 xBary yBary zBary JD0 -0.784839 51.731244 0.931838 -0.005225 -0.392263 2457273.133899 # Heliocentric elements and errors Epoch: 2457270.5000 = 2015/09/05 Mean Anomaly: 330.82475 +/- 0.258 Argument of Peri: 232.10021 +/- 0.336 Long of Asc Node: 214.33405 +/- 0.005 Inclination: 2.79493 +/- 0.001 Eccentricity: 0.10743651 +/- 0.0004 Semi-Major Axis: 46.50931295 +/- 0.0055 Time of Perihelion: 2466659.5231 +/- 83.1 Perihelion: 41.51251468 +/- 0.0209 Aphelion: 51.50611122 +/- 0.0212 Period (y) 317.1890 +/- 0.06 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 26.91511372 +/- 0.0006 Ecliptic Y 32.61913510 +/- 0.0008 Ecliptic Z -0.57387849 +/- 0.0000 Ecliptic XDOT -0.00222771 +/- 0.0000 Ecliptic YDOT 0.00162847 +/- 0.0000 Ecliptic ZDOT -0.00012699 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 42.29374253 +/- 0.0007 Geocenter to KBO 41.89399350 +/- 0.0010 # Hcoef: 8.43
The following table shows the complete astrometric record for 15VD171. 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 (15VD171) followed by the observatory code and reference code for the source of the astrometry.
2015 09 07.63311 03 18 05.714 +17 26 23.35 25.6w 15VD171 568 C~2nw8 2015 09 12.49674 03 17 58.243 +17 25 46.17 23.7w 15VD171 568 C~2nw8 2015 10 07.54436 03 16 48.864 +17 20 40.58 25.0w 15VD171 568 C~2nw8 2015 10 07.60373 03 16 48.651 +17 20 39.59 25.4w 15VD171 568 C~2nw8 2015 10 09.58362 03 16 41.246 +17 20 08.32 25.0w 15VD171 568 C~2nw8 2015 11 07.33788 03 14 33.324 +17 11 20.73 24.7r 15VD171 568 C~2nw8 2015 11 07.38006 03 14 33.113 +17 11 19.87 24.4r 15VD171 568 C~2nw8 2015 11 07.42224 03 14 32.908 +17 11 18.99 24.6r 15VD171 568 C~2nw8 2015 11 17.35218 03 13 44.261 +17 08 01.77 24.7w 15VD171 568 C~2nw8 2015 11 17.39878 03 13 44.024 +17 08 00.89 24.9w 15VD171 568 C~2nw8 2015 12 06.36096 03 12 14.660 +17 02 02.06 24.8w 15VD171 568 C~2nw8 2015 12 06.49848 03 12 14.071 +17 01 59.52 24.7w 15VD171 568 C~2nw8 2016 01 01.34872 03 10 38.551 +16 55 42.66 25.1w 15VD171 568 C~2nw8 2016 01 08.25624 03 10 21.121 +16 54 35.43 25.0w 15VD171 568 C~2nw8 2016 02 05.28768 03 09 55.184 +16 53 06.18 24.8w 15VD171 568 C~2nw8 2016 02 10.30807 03 09 58.632 +16 53 22.93 24.8w 15VD171 568 C~2nw8 2016 09 26.58416 03 23 04.711 +17 40 38.08 24.9w 15VD171 568 C~2nw8 2016 10 09.54522 03 22 21.315 +17 37 36.58 25.5w 15VD171 568 C~2nw8 2016 10 09.61729 03 22 21.026 +17 37 35.56 24.8w 15VD171 568 C~2nw8 2016 11 02.52573 03 20 36.548 +17 30 35.03 24.8w 15VD171 568 C~2nw8 2016 11 04.40084 03 20 27.514 +17 29 59.21 24.8w 15VD171 568 C~2nw8 2016 12 24.31334 03 16 41.490 +17 15 21.83 15VD171 568 C~2nw8 2016 12 25.28177 03 16 38.169 +17 15 09.37 24.7w 15VD171 568 C~2nw8 2016 12 28.42845 03 16 27.783 +17 14 30.33 24.7w 15VD171 568 C~2nw8 2017 01 02.41556 03 16 12.904 +17 13 34.48 25.1w 15VD171 568 C~2nw8 2017 01 26.32908 03 15 31.462 +17 11 06.93 25.1w 15VD171 568 C~2nw8 2017 09 15.58856 03 29 14.162 +17 59 27.24 24.9w 15VD171 568 C~2nw8 2017 09 22.57478 03 28 59.167 +17 58 20.87 25.4w 15VD171 568 C~2nw8 2017 12 16.34929 03 22 55.400 +17 34 55.51 24.6w 15VD171 568 C~2nw8
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 0.04
2 0.0133 -112.89 0.08 -8.30 -0.11
3 0.0819 -1151.30 -0.18 -46.11 0.03
4 0.0821 -1154.50 -0.06 -46.28 -0.07
5 0.0875 -1265.02 -0.04 -48.91 -0.06
6 0.1662 -3171.85 0.17 -79.29 0.15
7 0.1663 -3174.99 0.13 -79.32 0.12
8 0.1664 -3178.06 0.17 -79.40 0.06
9 0.1936 -3902.82 -0.06 -86.18 -0.03
10 0.1937 -3906.33 -0.12 -86.13 0.02
11 0.2457 -5237.58 -0.11 -93.12 -0.02
12 0.2460 -5246.40 0.28 -93.33 -0.23
13 0.3168 -6668.80 -0.04 -91.33 -0.00
14 0.3357 -6928.08 0.02 -89.15 -0.07
15 0.4125 -7311.10 -0.10 -75.32 0.03
16 0.4262 -7258.86 -0.13 -72.46 0.07
17 1.0539 4353.21 -0.03 -264.27 0.04
18 1.0894 3706.95 0.06 -283.35 0.02
19 1.0896 3702.69 -0.06 -283.30 0.17
20 1.1551 2150.48 -0.01 -310.62 -0.05
21 1.1602 2016.37 -0.04 -312.28 -0.06
22 1.2969 -1336.14 0.01 -326.46 -0.15
23 1.2995 -1385.31 0.16 -326.12 -0.03
24 1.3081 -1539.14 0.00 -325.11 0.08
25 1.3218 -1759.51 0.01 -323.52 -0.02
26 1.3873 -2371.31 -0.08 -310.96 0.13
27 2.0231 9750.52 -0.00 -478.54 -0.03
28 2.0423 9526.37 -0.00 -490.68 0.01
29 2.2744 4137.99 -0.00 -562.30 -0.05
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.
15VD171 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 46.988 46.999 46.976 ecceobj 0.112 0.113 0.112 incobj 2.781 2.780 2.780 qmin 40.738 40.732 40.720 qmax 52.811 52.788 52.752 amean 46.596 46.597 46.573 amin 46.196 46.200 46.177 amax 47.030 47.025 46.983 emean 0.110 0.110 0.110 emin 0.097 0.098 0.097 emax 0.123 0.123 0.123 imean 3.829 3.823 3.828 imin 3.388 3.378 3.390 imax 4.205 4.202 4.203 excite_mean 0.129 0.129 0.128 fracstop 1.000 1.000 1.000 cjmean 3.113 3.113 3.113 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 181.4 182.1 181.8 kozaiamp 180.0 180.0 180.0