Orbit Fit and Astrometric record for 15VK171

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: 15VK171   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting     28 observations of     28
# Arc:   2.26y
# First observation: 2015/09/12
#  Last observation: 2017/12/16
Preliminary a, adot, b, bdot, g, gdot:
  -0.000092   0.021015  -0.000003   0.001816   0.022665   0.000000
# Chi-squared of fit:     9.22 DOF:     50 RMS:  0.10
# Min/Max residuals:    -0.28    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.372786E-05  2.087004E-02  1.908641E-06  1.803040E-03  2.265830E-02 -8.012329E-04
# Covariance matrix:
  2.5953E-13 -3.2616E-14 -1.2799E-15  9.6983E-15  1.8331E-13  2.9314E-12
 -3.2616E-14  3.0645E-13 -5.9567E-15  2.7263E-14  1.8744E-13  8.0678E-12
 -1.2799E-15 -5.9567E-15  1.3358E-13 -1.0038E-13 -5.0429E-15 -2.5948E-13
  9.6983E-15  2.7263E-14 -1.0038E-13  1.2535E-13  2.7433E-14  1.1882E-12
  1.8331E-13  1.8744E-13 -5.0429E-15  2.7433E-14  3.2080E-13  8.1877E-12
  2.9314E-12  8.0678E-12 -2.5948E-13  1.1882E-12  8.1877E-12  3.5163E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.483623   51.817147    0.896195   -0.011913   -0.465520  2457277.997529
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          243.72213 +/-     0.386
Argument of Peri:      106.49074 +/-     0.377
Long of Asc Node:       67.25197 +/-     0.003
Inclination:             5.13040 +/-     0.001
Eccentricity:         0.06974210 +/-    0.0007
Semi-Major Axis:     43.11485168 +/-    0.0053
Time of Perihelion: 2490669.4900 +/-     110.7
Perihelion:          40.10793143 +/-    0.0320
Aphelion:            46.12177192 +/-    0.0321
Period (y)              283.1057 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           28.26152354 +/-    0.0007
Ecliptic Y           34.49123942 +/-    0.0009
Ecliptic Z           -1.14258465 +/-    0.0000
Ecliptic XDOT        -0.00204039 +/-    0.0000
Ecliptic YDOT         0.00148082 +/-    0.0000
Ecliptic ZDOT         0.00022035 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.60565894 +/-    0.0008
Geocenter to KBO     44.13393513 +/-    0.0011
# Hcoef:  8.48

The following table shows the complete astrometric record for 15VK171. 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 (15VK171) followed by the observatory code and reference code for the source of the astrometry.

2015 09  12.49674  03 19 11.746  +16 47 12.21  25.1w 15VK171   568  C~2nw9      
2015 10  07.54436  03 18 04.149  +16 42 39.47  25.5w 15VK171   568  C~2nw9      
2015 10  09.58362  03 17 56.757  +16 42 10.51  25.1w 15VK171   568  C~2nw9      
2015 11  07.33788  03 15 53.234  +16 34 21.80  24.6r 15VK171   568  C~2nw9      
2015 11  07.38006  03 15 53.026  +16 34 21.07  24.9r 15VK171   568  C~2nw9      
2015 11  07.42224  03 15 52.843  +16 34 20.36  24.8r 15VK171   568  C~2nw9      
2015 11  10.50536  03 15 38.266  +16 33 26.40  25.0w 15VK171   568  C~2nw9      
2015 11  17.35218  03 15 05.860  +16 31 27.51  25.0w 15VK171   568  C~2nw9      
2015 11  17.39878  03 15 05.635  +16 31 26.71  24.9w 15VK171   568  C~2nw9      
2016 01  01.34872  03 12 05.024  +16 21 06.26  25.1w 15VK171   568  C~2nw9      
2016 01  08.25624  03 11 47.636  +16 20 16.25  25.1w 15VK171   568  C~2nw9      
2016 02  05.28768  03 11 19.336  +16 19 48.35  25.9w 15VK171   568  C~2nw9      
2016 02  10.30807  03 11 21.895  +16 20 14.45  24.9w 15VK171   568  C~2nw9      
2016 09  07.62568  03 24 01.294  +17 11 50.30        15VK171   568  C~2nw9      
2016 09  26.58416  03 23 21.865  +17 09 12.13  25.5w 15VK171   568  C~2nw9      
2016 10  09.54522  03 22 39.573  +17 06 31.07  24.9w 15VK171   568  C~2nw9      
2016 10  09.61729  03 22 39.302  +17 06 29.96  25.0w 15VK171   568  C~2nw9      
2016 11  02.51995  03 20 58.202  +17 00 16.70  25.3w 15VK171   568  C~2nw9      
2016 11  02.52573  03 20 58.174  +17 00 16.66  25.1w 15VK171   568  C~2nw9      
2016 11  04.39506  03 20 49.479  +16 59 45.17  25.2w 15VK171   568  C~2nw9      
2016 11  04.40084  03 20 49.450  +16 59 45.08  25.1w 15VK171   568  C~2nw9      
2016 12  24.33186  03 17 10.476  +16 47 09.72  25.5w 15VK171   568  C~2nw9      
2017 01  02.43457  03 16 42.432  +16 45 44.08  25.4w 15VK171   568  C~2nw9      
2017 01  26.32908  03 16 00.570  +16 44 08.92  25.7w 15VK171   568  C~2nw9      
2017 01  27.28684  03 15 59.971  +16 44 09.35  25.1w 15VK171   568  C~2nw9      
2017 09  21.62755  03 28 21.398  +17 34 01.07  25.2w 15VK171   568  C~2nw9      
2017 09  22.56874  03 28 19.154  +17 33 52.67  24.8w 15VK171   568  C~2nw9      
2017 12  16.36856  03 22 26.249  +17 13 19.78  25.2w 15VK171   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     0.17       0.00    -0.13
     2   0.0686  -1008.44     0.02     -13.50     0.05
     3   0.0742  -1118.52    -0.15     -14.05    -0.08
     4   0.1529  -2954.79     0.03      -5.82     0.04
     5   0.1530  -2957.87    -0.06      -5.75     0.07
     6   0.1531  -2960.60     0.20      -5.75     0.02
     7   0.1616  -3177.04    -0.23      -3.14    -0.01
     8   0.1803  -3658.03     0.00       3.95     0.06
     9   0.1804  -3661.36    -0.01       4.02     0.07
    10   0.3035  -6333.05     0.03      90.48     0.02
    11   0.3224  -6587.87     0.05     108.74    -0.07
    12   0.3992  -6988.41     0.15     190.25    -0.20
    13   0.4129  -6945.91    -0.12     205.61     0.02
    14   0.9887   4393.44     0.02     375.21     0.06
    15   1.0406   3806.53     0.00     364.10    -0.03
    16   1.0761   3179.09     0.07     361.09     0.12
    17   1.0763   3175.05     0.04     361.00     0.02
    18   1.1417   1677.77    -0.06     367.64    -0.10
    19   1.1418   1677.37    -0.05     367.70    -0.04
    20   1.1469   1548.73    -0.00     369.02     0.01
    21   1.1469   1548.31    -0.02     369.04     0.02
    22   1.2836  -1683.23     0.06     447.04     0.13
    23   1.3085  -2094.45    -0.14     468.90    -0.01
    24   1.3739  -2699.87    -0.19     533.54     0.03
    25   1.3766  -2708.06     0.08     536.20    -0.03
    26   2.0264   8334.49    -0.07     740.70     0.07
    27   2.0289   8301.26    -0.05     740.43     0.17
    28   2.2611   3097.61     0.21     804.85    -0.28

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.

15VK171    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.492    43.505    43.480
ecceobj         0.061     0.063     0.060
incobj          5.116     5.116     5.116
qmin           39.272    39.214    39.341
qmax           47.357    47.432    47.280
amean          43.198    43.210    43.186
amin           42.860    42.866    42.852
amax           43.559    43.577    43.551
emean           0.067     0.069     0.066
emin            0.048     0.050     0.047
emax            0.087     0.089     0.086
imean           3.392     3.397     3.387
imin            2.446     2.448     2.446
imax            4.388     4.392     4.380
excite_mean     0.090     0.091     0.089
fracstop        1.000     1.000     1.000
cjmean          3.082     3.082     3.082

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       179.8     179.8     179.9
kozaiamp        179.9     180.0     180.0