Orbit Fit and Astrometric record for 15VY171

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: 15VY171   
# Created Tue Apr  1 01:10:42 2025
# Orbit generated from Bernstein formalism
# Fitting     37 observations of     37
# Arc:   3.08y
# First observation: 2014/11/17
#  Last observation: 2017/12/16
Preliminary a, adot, b, bdot, g, gdot:
   0.000032   0.022919  -0.000001   0.000514   0.023709   0.000000
# Chi-squared of fit:    12.76 DOF:     68 RMS:  0.10
# Min/Max residuals:    -0.36    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.494505E-05  2.308804E-02  6.019077E-08  5.181429E-04  2.393329E-02  5.172941E-04
# Covariance matrix:
  3.7326E-13 -4.0614E-13  5.2361E-15 -7.4278E-15 -1.9390E-13 -4.1636E-12
 -4.0614E-13  5.6210E-13 -8.1424E-15  1.1898E-14  2.7921E-13  6.6119E-12
  5.2361E-15 -8.1424E-15  1.7321E-13 -9.3126E-14 -5.2406E-15 -1.0822E-13
 -7.4278E-15  1.1898E-14 -9.3126E-14  6.5267E-14  6.2540E-15  1.5829E-13
 -1.9390E-13  2.7921E-13 -5.2406E-15  6.2540E-15  2.6989E-13  3.7009E-12
 -4.1636E-12  6.6119E-12 -1.0822E-13  1.5829E-13  3.7009E-12  8.7941E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   -2.776600   48.810135   -0.100035   -0.047526   -0.983234  2456978.926868
# Heliocentric elements and errors
Epoch:              2456970.5000  =  2014/11/09
Mean Anomaly:           66.77694 +/-     0.292
Argument of Peri:      225.97641 +/-     0.337
Long of Asc Node:      113.56782 +/-     0.011
Inclination:             3.00211 +/-     0.000
Eccentricity:         0.02409811 +/-    0.0004
Semi-Major Axis:     43.15334012 +/-    0.0027
Time of Perihelion: 2437764.1838 +/-      84.0
Perihelion:          42.11342627 +/-    0.0169
Aphelion:            44.19325398 +/-    0.0169
Period (y)              283.4848 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           28.05389219 +/-    0.0006
Ecliptic Y           32.21410997 +/-    0.0007
Ecliptic Z           -2.02406014 +/-    0.0000
Ecliptic XDOT        -0.00195101 +/-    0.0000
Ecliptic YDOT         0.00178102 +/-    0.0000
Ecliptic ZDOT         0.00005644 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.76524954 +/-    0.0006
Geocenter to KBO     41.78280371 +/-    0.0009
# Hcoef:  8.59

The following table shows the complete astrometric record for 15VY171. 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 (15VY171) followed by the observatory code and reference code for the source of the astrometry.

2014 11  17.42609  03 08 34.004  +14 44 47.61  24.7r 15VY171   568  C~2nwB      
2014 11  17.54029  03 08 33.440  +14 44 45.30  24.7r 15VY171   568  C~2nwB      
2014 11  23.44182  03 08 05.307  +14 42 56.13  25.5r 15VY171   568  C~2nwB      
2015 08  11.60150  03 18 12.709  +15 28 35.02  25.1w 15VY171   568  C~2nwB      
2015 09  06.61481  03 18 10.828  +15 26 54.25  24.9w 15VY171   568  C~2nwB      
2015 09  12.50491  03 18 01.900  +15 25 59.94  25.2w 15VY171   568  C~2nwB      
2015 10  07.42821  03 16 53.112  +15 20 24.11  25.2w 15VY171   568  C~2nwB      
2015 10  08.44001  03 16 49.376  +15 20 07.41  25.5w 15VY171   568  C~2nwB      
2015 10  08.49908  03 16 49.144  +15 20 06.57  25.5w 15VY171   568  C~2nwB      
2015 11  07.34843  03 14 38.305  +15 10 59.72  25.2r 15VY171   568  C~2nwB      
2015 11  07.39058  03 14 38.093  +15 10 58.94  24.9r 15VY171   568  C~2nwB      
2015 11  07.43274  03 14 37.870  +15 10 58.00  24.8r 15VY171   568  C~2nwB      
2015 11  10.51713  03 14 22.941  +15 09 59.53  25.1w 15VY171   568  C~2nwB      
2015 11  10.54648  03 14 22.805  +15 09 58.87  25.0w 15VY171   568  C~2nwB      
2015 11  17.36382  03 13 49.749  +15 07 50.92  24.8w 15VY171   568  C~2nwB      
2015 11  17.41043  03 13 49.517  +15 07 50.00  24.8w 15VY171   568  C~2nwB      
2015 12  06.37266  03 12 21.053  +15 02 24.30  24.9w 15VY171   568  C~2nwB      
2015 12  13.30706  03 11 51.732  +15 00 42.87  25.1w 15VY171   568  C~2nwB      
2015 12  13.36559  03 11 51.487  +15 00 42.09  25.2w 15VY171   568  C~2nwB      
2016 01  07.30705  03 10 30.353  +14 56 36.35  25.2w 15VY171   568  C~2nwB      
2016 02  11.22942  03 10 05.181  +14 57 21.73  25.5w 15VY171   568  C~2nwB      
2016 09  07.56785  03 23 19.749  +15 48 25.76        15VY171   568  C~2nwB      
2016 09  27.50655  03 22 36.905  +15 44 44.28  25.3w 15VY171   568  C~2nwB      
2016 10  10.44325  03 21 52.973  +15 41 28.41  25.1w 15VY171   568  C~2nwB      
2016 10  10.50202  03 21 52.740  +15 41 27.50  25.2w 15VY171   568  C~2nwB      
2016 10  10.51973  03 21 52.666  +15 41 27.27  25.2w 15VY171   568  C~2nwB      
2016 11  02.51417  03 20 12.651  +15 34 38.61  24.9w 15VY171   568  C~2nwB      
2016 11  04.38927  03 20 03.712  +15 34 03.88  25.2w 15VY171   568  C~2nwB      
2016 12  24.31885  03 16 20.278  +15 20 54.37  25.2w 15VY171   568  C~2nwB      
2016 12  24.33677  03 16 20.209  +15 20 54.39  24.2w 15VY171   568  C~2nwB      
2017 01  02.42106  03 15 51.927  +15 19 33.80  24.8w 15VY171   568  C~2nwB      
2017 01  02.43952  03 15 51.860  +15 19 33.64  24.9w 15VY171   568  C~2nwB      
2017 01  26.34976  03 15 10.318  +15 18 25.46  25.3w 15VY171   568  C~2nwB      
2017 09  16.63393  03 28 17.293  +16 08 21.90  25.0w 15VY171   568  C~2nwB      
2017 09  17.59434  03 28 15.379  +16 08 11.93  25.4w 15VY171   568  C~2nwB      
2017 09  23.57295  03 28 01.655  +16 07 04.46  24.9w 15VY171   568  C~2nwB      
2017 12  16.35926  03 22 04.266  +15 44 33.10  25.0w 15VY171   568  C~2nwB      

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   0.0003     -8.50    -0.06      -0.01    -0.06
     3   0.0165   -430.94     0.11       5.57    -0.36
     4   0.7315   8782.46     0.23     307.04    -0.03
     5   0.8027   8729.88    -0.14     216.74    -0.02
     6   0.8188   8590.86    -0.03     197.90    -0.08
     7   0.8871   7541.23     0.22     133.47    -0.00
     8   0.8898   7484.63    -0.02     131.50    -0.00
     9   0.8900   7481.16    -0.10     131.57     0.16
    10   0.9717   5508.63     0.17     102.07    -0.07
    11   0.9718   5505.46     0.10     102.13    -0.03
    12   0.9720   5502.10    -0.16     102.08    -0.10
    13   0.9804   5278.05    -0.25     102.84     0.17
    14   0.9805   5275.98    -0.16     102.73     0.05
    15   0.9991   4780.28    -0.03     106.12     0.03
    16   0.9993   4776.79    -0.08     106.12    -0.02
    17   1.0512   3454.55    -0.08     132.94     0.05
    18   1.0702   3018.01    -0.03     148.64     0.03
    19   1.0703   3014.38    -0.05     148.84     0.06
    20   1.1386   1815.70     0.05     227.24     0.22
    21   1.2342   1476.53     0.04     369.09     0.04
    22   1.8074  13388.00    -0.02     316.22     0.02
    23   1.8620  12730.90     0.07     259.57     0.01
    24   1.8974  12065.16     0.04     232.37    -0.02
    25   1.8975  12061.67    -0.01     232.35     0.04
    26   1.8976  12060.57    -0.06     232.40     0.11
    27   1.9605  10554.83     0.06     208.86    -0.05
    28   1.9657  10420.73    -0.06     208.65     0.12
    29   2.1024   7090.25     0.10     287.25    -0.01
    30   2.1024   7089.29     0.07     287.53     0.21
    31   2.1273   6672.90     0.12     317.23    -0.12
    32   2.1273   6671.93    -0.10     317.33    -0.08
    33   2.1928   6073.61     0.04     409.83    -0.04
    34   2.8315  17867.50    -0.08     394.68    -0.01
    35   2.8341  17838.08     0.04     391.87    -0.08
    36   2.8505  17628.21     0.06     375.67    -0.05
    37   3.0799  12270.80    -0.07     369.39    -0.13

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.

15VY171    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.483    43.491    43.474
ecceobj         0.031     0.032     0.031
incobj          3.004     3.004     3.004
qmin           40.970    40.947    40.981
qmax           45.576    45.560    45.539
amean          43.156    43.170    43.148
amin           42.819    42.836    42.828
amax           43.498    43.505    43.479
emean           0.031     0.032     0.030
emin            0.010     0.010     0.009
emax            0.048     0.048     0.047
imean           1.913     1.911     1.914
imin            0.886     0.887     0.886
imax            2.734     2.728     2.736
excite_mean     0.047     0.047     0.046
fracstop        1.000     1.000     1.000
cjmean          3.089     3.089     3.089

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       173.6     173.7     174.1
kozaiamp        180.0     180.0     179.9