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: 15VK172
# Created Tue Apr 1 01:10:42 2025
# Orbit generated from Bernstein formalism
# Fitting 18 observations of 18
# Arc: 1.39y
# First observation: 2015/09/06
# Last observation: 2017/01/26
Preliminary a, adot, b, bdot, g, gdot:
-0.000064 0.026547 -0.000002 -0.000890 0.025248 0.000000
# Chi-squared of fit: 10.57 DOF: 30 RMS: 0.14
# Min/Max residuals: -0.27 0.39
# Exact a, adot, b, bdot, g, gdot:
1.606259E-05 2.623276E-02 -1.866194E-06 -8.828200E-04 2.503691E-02 -6.140050E-04
# Covariance matrix:
5.1378E-13 5.3228E-13 2.8740E-15 -4.0118E-14 9.2784E-13 3.6074E-11
5.3228E-13 1.9265E-12 7.3028E-15 -9.7628E-14 2.0605E-12 8.7701E-11
2.8740E-15 7.3028E-15 1.9199E-13 -1.7746E-13 8.4678E-15 4.1717E-13
-4.0118E-14 -9.7628E-14 -1.7746E-13 2.8579E-13 -1.1739E-13 -5.4004E-12
9.2784E-13 2.0605E-12 8.4678E-15 -1.1739E-13 2.6779E-12 1.0554E-10
3.6074E-11 8.7701E-11 4.1717E-13 -5.4004E-12 1.0554E-10 4.8476E-09
# lat0 lon0 xBary yBary zBary JD0
0.221825 50.609062 0.931078 0.001675 -0.394672 2457272.119709
# Heliocentric elements and errors
Epoch: 2457270.5000 = 2015/09/05
Mean Anomaly: 341.18888 +/- 0.888
Argument of Peri: 198.00794 +/- 1.191
Long of Asc Node: 235.79632 +/- 0.003
Inclination: 1.93682 +/- 0.001
Eccentricity: 0.13103319 +/- 0.0012
Semi-Major Axis: 45.94217210 +/- 0.0165
Time of Perihelion: 2463213.8043 +/- 280.7
Perihelion: 39.92222293 +/- 0.0569
Aphelion: 51.96212127 +/- 0.0581
Period (y) 311.4049 +/- 0.17
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 26.31268749 +/- 0.0017
Ecliptic Y 30.58148700 +/- 0.0020
Ecliptic Z 0.15456911 +/- 0.0000
Ecliptic XDOT -0.00226121 +/- 0.0000
Ecliptic YDOT 0.00176243 +/- 0.0000
Ecliptic ZDOT -0.00009674 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 40.34363347 +/- 0.0019
Geocenter to KBO 39.94103607 +/- 0.0026
# Hcoef: 9.68
The following table shows the complete astrometric record for 15VK172. 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 (15VK172) followed by the observatory code and reference code for the source of the astrometry.
2015 09 06.61892 03 12 26.307 +18 07 02.73 25.3w 15VK172 568 C~2nwD 2015 09 12.50905 03 12 16.484 +18 06 22.73 26.6w 15VK172 568 C~2nwD 2015 10 07.43408 03 11 02.147 +18 01 23.22 25.4w 15VK172 568 C~2nwD 2015 10 08.44583 03 10 58.160 +18 01 06.79 26.7w 15VK172 568 C~2nwD 2015 10 08.50488 03 10 57.915 +18 01 05.74 26.1w 15VK172 568 C~2nwD 2015 11 07.35377 03 08 38.564 +17 51 38.63 25.1r 15VK172 568 C~2nwD 2015 11 07.39585 03 08 38.341 +17 51 37.61 25.1r 15VK172 568 C~2nwD 2015 11 07.43803 03 08 38.132 +17 51 36.90 25.4r 15VK172 568 C~2nwD 2015 11 10.52298 03 08 22.343 +17 50 31.99 25.5w 15VK172 568 C~2nwD 2016 09 06.61138 03 18 35.224 +18 27 37.16 26.1w 15VK172 568 C~2nwD 2016 09 26.60062 03 17 50.459 +18 24 41.55 26.7w 15VK172 568 C~2nwD 2016 10 10.40808 03 17 00.675 +18 21 26.73 25.9w 15VK172 568 C~2nwD 2016 10 10.46643 03 17 00.453 +18 21 25.74 25.6w 15VK172 568 C~2nwD 2016 11 02.53733 03 15 13.487 +18 14 24.44 25.8w 15VK172 568 C~2nwD 2016 11 03.52763 03 15 08.482 +18 14 04.59 25.8w 15VK172 568 C~2nwD 2016 11 04.41248 03 15 04.005 +18 13 46.91 25.7w 15VK172 568 C~2nwD 2017 01 02.38784 03 10 41.565 +17 56 02.01 27.1w 15VK172 568 C~2nwD 2017 01 26.27742 03 10 01.920 +17 53 06.66 26.2w 15VK172 568 C~2nwD
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 0.27
2 0.0161 -145.64 -0.05 -1.35 0.07
3 0.0844 -1247.23 -0.03 -7.37 0.14
4 0.0871 -1306.42 -0.06 -7.99 -0.19
5 0.0873 -1310.07 -0.15 -8.07 -0.27
6 0.1690 -3378.25 0.10 -19.27 0.03
7 0.1691 -3381.59 -0.01 -19.39 -0.09
8 0.1693 -3384.65 0.18 -19.27 0.03
9 0.1777 -3619.31 -0.10 -20.73 0.03
10 1.0020 5395.40 0.39 -182.84 -0.22
11 1.0568 4734.24 -0.25 -188.17 0.08
12 1.0946 3998.99 -0.18 -192.78 0.13
13 1.0947 3995.68 0.08 -192.91 -0.01
14 1.1579 2414.78 0.00 -202.39 -0.07
15 1.1606 2340.75 -0.04 -202.87 -0.08
16 1.1630 2274.56 -0.03 -203.21 0.02
17 1.3245 -1616.16 -0.04 -238.27 0.05
18 1.3899 -2208.37 0.08 -255.38 0.08
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.
15VK172 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 46.436 46.458 46.416 ecceobj 0.138 0.140 0.136 incobj 1.929 1.929 1.929 qmin 38.992 38.930 39.155 qmax 53.350 53.514 53.173 amean 46.030 46.050 46.009 amin 45.639 45.669 45.625 amax 46.452 46.500 46.447 emean 0.135 0.137 0.133 emin 0.121 0.123 0.121 emax 0.149 0.152 0.146 imean 3.381 3.380 3.450 imin 2.799 2.791 2.892 imax 3.884 3.887 3.885 excite_mean 0.148 0.149 0.146 fracstop 1.000 1.000 1.000 cjmean 3.099 3.099 3.100 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 189.7 189.5 184.1 kozaiamp 179.9 180.0 180.0