Orbit Fit and Astrometric record for 15VK170

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: 15VK170   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting     33 observations of     33
# Arc:   2.27y
# First observation: 2015/09/07
#  Last observation: 2017/12/13
Preliminary a, adot, b, bdot, g, gdot:
  -0.000101   0.022648  -0.000003   0.000575   0.023480   0.000000
# Chi-squared of fit:     6.43 DOF:     60 RMS:  0.08
# Min/Max residuals:    -0.22    0.37
# Exact a, adot, b, bdot, g, gdot:
  1.534750E-05  2.248732E-02  4.263775E-07  5.705626E-04  2.343951E-02  1.501228E-03
# Covariance matrix:
  1.8861E-13 -4.5440E-14  1.0243E-15  1.1744E-15  1.2472E-13  1.5564E-12
 -4.5440E-14  3.2026E-13 -3.8814E-16  6.8848E-15  1.5803E-13  8.1604E-12
  1.0243E-15 -3.8814E-16  1.0353E-13 -8.0613E-14  1.0622E-15 -1.2255E-14
  1.1744E-15  6.8848E-15 -8.0613E-14  1.0913E-13  5.1840E-15  2.6590E-13
  1.2472E-13  1.5803E-13  1.0622E-15  5.1840E-15  2.4041E-13  6.3486E-12
  1.5564E-12  8.1604E-12 -1.2255E-14  2.6590E-13  6.3486E-12  3.1558E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.718900   53.156854    0.941392   -0.010914   -0.368638  2457273.121609
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:           78.91405 +/-     0.064
Argument of Peri:      225.83348 +/-     0.104
Long of Asc Node:      102.24802 +/-     0.017
Inclination:             2.21274 +/-     0.001
Eccentricity:         0.04301205 +/-    0.0008
Semi-Major Axis:     43.31913673 +/-    0.0046
Time of Perihelion: 2434442.3898 +/-      18.3
Perihelion:          41.45589174 +/-    0.0345
Aphelion:            45.18238173 +/-    0.0346
Period (y)              285.1201 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           26.54077217 +/-    0.0005
Ecliptic Y           33.85740477 +/-    0.0007
Ecliptic Z           -1.27969181 +/-    0.0000
Ecliptic XDOT        -0.00199761 +/-    0.0000
Ecliptic YDOT         0.00171044 +/-    0.0000
Ecliptic ZDOT         0.00006141 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.03921532 +/-    0.0006
Geocenter to KBO     42.66300173 +/-    0.0009
# Hcoef:  7.37

The following table shows the complete astrometric record for 15VK170. 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 (15VK170) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.62082  03 24 51.554  +16 53 52.87  24.0w 15VK170   568  C~2nw5      
2015 09  12.48448  03 24 44.634  +16 53 17.56  24.0w 15VK170   568  C~2nw5      
2015 10  07.52687  03 23 38.217  +16 48 29.77  23.9w 15VK170   568  C~2nw5      
2015 10  07.58621  03 23 38.005  +16 48 28.88  24.0w 15VK170   568  C~2nw5      
2015 10  09.56611  03 23 30.812  +16 47 59.62  23.8w 15VK170   568  C~2nw5      
2015 11  06.33883  03 21 29.977  +16 40 08.61  22.9r 15VK170   568  C~2nw5      
2015 11  06.40946  03 21 29.640  +16 40 07.37  24.2r 15VK170   568  C~2nw5      
2015 11  06.47899  03 21 29.299  +16 40 06.06  23.8r 15VK170   568  C~2nw5      
2015 11  07.49597  03 21 24.401  +16 39 47.56  23.9w 15VK170   568  C~2nw5      
2015 11  17.47779  03 20 35.856  +16 36 46.46  24.0w 15VK170   568  C~2nw5      
2015 11  17.56554  03 20 35.417  +16 36 44.78  23.7w 15VK170   568  C~2nw5      
2015 12  06.34344  03 19 06.754  +16 31 24.52  23.8w 15VK170   568  C~2nw5      
2015 12  06.48092  03 19 06.143  +16 31 22.69  23.9w 15VK170   568  C~2nw5      
2015 12  31.36453  03 17 31.142  +16 26 03.41  23.9w 15VK170   568  C~2nw5      
2016 01  07.39390  03 17 11.856  +16 25 05.64  23.7w 15VK170   568  C~2nw5      
2016 02  05.29346  03 16 38.395  +16 24 14.86  23.8w 15VK170   568  C~2nw5      
2016 02  11.24684  03 16 41.390  +16 24 43.57  24.1w 15VK170   568  C~2nw5      
2016 09  07.57941  03 30 01.427  +17 14 40.63  24.2w 15VK170   568  C~2nw5      
2016 09  27.51468  03 29 21.096  +17 11 40.17  24.0w 15VK170   568  C~2nw5      
2016 09  29.49059  03 29 15.337  +17 11 16.43  24.1w 15VK170   568  C~2nw5      
2016 10  05.49370  03 28 56.100  +17 09 58.62  24.1w 15VK170   568  C~2nw5      
2016 10  07.49825  03 28 49.132  +17 09 30.92        15VK170   568  C~2nw5      
2016 10  07.59395  03 28 48.767  +17 09 29.58  24.2w 15VK170   568  C~2nw5      
2016 10  09.49835  03 28 41.913  +17 09 02.43  24.3w 15VK170   568  C~2nw5      
2016 10  09.57103  03 28 41.641  +17 09 01.39  23.9w 15VK170   568  C~2nw5      
2016 11  02.47368  03 26 59.431  +17 02 33.26  23.8w 15VK170   568  C~2nw5      
2016 11  04.44969  03 26 50.036  +17 01 58.64  23.9w 15VK170   568  C~2nw5      
2016 12  28.46047  03 22 49.650  +16 48 08.08  24.1w 15VK170   568  C~2nw5      
2016 12  29.39076  03 22 46.636  +16 47 58.53  23.3w 15VK170   568  C~2nw5      
2017 01  27.30287  03 21 48.313  +16 45 32.87  24.1w 15VK170   568  C~2nw5      
2017 09  16.62789  03 34 59.548  +17 33 58.40  23.9w 15VK170   568  C~2nw5      
2017 09  23.56691  03 34 44.774  +17 32 55.14  23.9w 15VK170   568  C~2nw5      
2017 12  13.38599  03 29 01.065  +17 12 25.26  23.8w 15VK170   568  C~2nw5      

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    -0.04       0.00    -0.01
     2   0.0133   -104.99    -0.02      -9.43     0.00
     3   0.0819  -1100.16    -0.03     -49.60    -0.00
     4   0.0820  -1103.33     0.03     -49.70    -0.04
     5   0.0875  -1210.66    -0.02     -52.12    -0.05
     6   0.1635  -3009.30    -0.10     -70.23     0.01
     7   0.1637  -3014.30     0.02     -70.20     0.01
     8   0.1639  -3019.38    -0.01     -70.23    -0.03
     9   0.1667  -3092.17    -0.03     -70.29    -0.05
    10   0.1940  -3813.18    -0.04     -68.25    -0.02
    11   0.1942  -3819.71    -0.13     -68.27    -0.08
    12   0.2456  -5134.58     0.08     -52.39    -0.02
    13   0.2460  -5143.55     0.37     -51.90     0.26
    14   0.3142  -6547.31    -0.12      -8.94     0.05
    15   0.3334  -6830.59    -0.02       6.95     0.01
    16   0.4125  -7309.36    -0.00      82.59    -0.01
    17   0.4288  -7260.23    -0.00      99.16     0.02
    18   1.0019   4614.47    -0.03     115.97     0.04
    19   1.0565   4009.81     0.08      81.51     0.04
    20   1.0619   3923.96     0.02      78.60     0.04
    21   1.0784   3637.53    -0.02      70.41    -0.02
    22   1.0839   3533.89     0.08      67.95    -0.02
    23   1.0841   3528.49    -0.16      67.93     0.05
    24   1.0893   3426.56     0.06      65.62    -0.02
    25   1.0895   3422.53     0.07      65.56    -0.01
    26   1.1550   1906.43     0.05      49.21    -0.04
    27   1.1604   1767.30    -0.00      48.91    -0.02
    28   1.3083  -1780.67     0.02     104.64     0.06
    29   1.3108  -1824.96    -0.02     106.30    -0.22
    30   1.3900  -2672.30    -0.02     176.79     0.04
    31   2.0260   9039.65     0.02     217.14     0.04
    32   2.0450   8818.98    -0.02     205.69     0.01
    33   2.2663   3742.36    -0.07     195.26    -0.01

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.

15VK170    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.746    43.763    43.730
ecceobj         0.050     0.051     0.048
incobj          2.213     2.213     2.213
qmin           40.550    40.464    40.586
qmax           46.539    46.608    46.417
amean          43.414    43.431    43.398
amin           43.077    43.088    43.067
amax           43.761    43.785    43.744
emean           0.047     0.048     0.045
emin            0.028     0.029     0.026
emax            0.064     0.065     0.061
imean           1.097     1.099     1.096
imin            0.000     0.000     0.000
imax            1.782     1.787     1.778
excite_mean     0.051     0.053     0.050
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       171.0     171.0     170.9
kozaiamp        180.0     179.9     180.0