Orbit Fit and Astrometric record for 15VY170

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: 15VY170   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting     32 observations of     32
# Arc:   2.04y
# First observation: 2015/09/07
#  Last observation: 2017/09/20
Preliminary a, adot, b, bdot, g, gdot:
  -0.000111   0.023176   0.000001   0.000705   0.023752   0.000000
# Chi-squared of fit:     4.19 DOF:     58 RMS:  0.06
# Min/Max residuals:    -0.18    0.15
# Exact a, adot, b, bdot, g, gdot:
  1.596189E-05  2.298629E-02  1.382566E-07  7.017522E-04  2.371159E-02  8.301000E-04
# Covariance matrix:
  2.1841E-13 -8.3004E-14 -5.8998E-16  1.7232E-15  1.3897E-13  1.3627E-12
 -8.3004E-14  3.7543E-13 -2.4954E-15  1.0765E-14  1.3067E-13  8.6057E-12
 -5.8998E-16 -2.4954E-15  1.0537E-13 -9.0910E-14 -1.9752E-15 -9.4973E-14
  1.7232E-15  1.0765E-14 -9.0910E-14  1.3759E-13  7.5394E-15  4.0183E-13
  1.3897E-13  1.3067E-13 -1.9752E-15  7.5394E-15  2.3248E-13  6.0093E-12
  1.3627E-12  8.6057E-12 -9.4973E-14  4.0183E-13  6.0093E-12  3.2108E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.232380   52.596703    0.937685    0.001682   -0.378110  2457273.129809
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:           40.73588 +/-     1.722
Argument of Peri:      325.36846 +/-     1.809
Long of Asc Node:       43.87009 +/-     0.004
Inclination:             1.77122 +/-     0.001
Eccentricity:         0.01785659 +/-    0.0006
Semi-Major Axis:     43.13676063 +/-    0.0037
Time of Perihelion: 2445560.8379 +/-     495.0
Perihelion:          42.36648512 +/-    0.0243
Aphelion:            43.90703614 +/-    0.0243
Period (y)              283.3215 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           26.58730424 +/-    0.0005
Ecliptic Y           33.23203841 +/-    0.0007
Ecliptic Z            0.17105988 +/-    0.0000
Ecliptic XDOT        -0.00205221 +/-    0.0000
Ecliptic YDOT         0.00168162 +/-    0.0000
Ecliptic ZDOT         0.00008147 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.55916335 +/-    0.0006
Geocenter to KBO     42.17346463 +/-    0.0009
# Hcoef:  7.46

The following table shows the complete astrometric record for 15VY170. 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 (15VY170) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.62902  03 20 30.961  +18 38 42.22  23.6w 15VY170   568  C~2nw7      
2015 09  12.49264  03 20 23.485  +18 38 17.61  24.1w 15VY170   568  C~2nw7      
2015 10  07.53854  03 19 13.837  +18 34 12.78  24.0w 15VY170   568  C~2nw7      
2015 10  07.59790  03 19 13.606  +18 34 11.94  24.1w 15VY170   568  C~2nw7      
2015 10  09.57780  03 19 06.155  +18 33 45.09  24.0w 15VY170   568  C~2nw7      
2015 11  07.33264  03 16 57.148  +18 25 50.25  23.7r 15VY170   568  C~2nw7      
2015 11  07.37479  03 16 56.937  +18 25 49.46  23.6r 15VY170   568  C~2nw7      
2015 11  07.41697  03 16 56.725  +18 25 48.75  23.8r 15VY170   568  C~2nw7      
2015 11  10.49950  03 16 41.481  +18 24 51.73  23.9w 15VY170   568  C~2nw7      
2015 11  17.34635  03 16 07.512  +18 22 44.07  23.9w 15VY170   568  C~2nw7      
2015 11  17.39294  03 16 07.280  +18 22 43.24  23.8w 15VY170   568  C~2nw7      
2015 12  06.35508  03 14 36.529  +18 16 59.00  23.9w 15VY170   568  C~2nw7      
2015 12  06.49265  03 14 35.901  +18 16 56.62  24.0w 15VY170   568  C~2nw7      
2016 01  01.34294  03 12 58.009  +18 10 40.01  24.1w 15VY170   568  C~2nw7      
2016 01  07.40549  03 12 41.854  +18 09 37.46  24.2w 15VY170   568  C~2nw7      
2016 01  08.25043  03 12 39.868  +18 09 29.66  24.0w 15VY170   568  C~2nw7      
2016 02  05.28189  03 12 10.943  +18 07 37.50  24.2w 15VY170   568  C~2nw7      
2016 02  10.30227  03 12 13.866  +18 07 49.12  24.1w 15VY170   568  C~2nw7      
2016 09  07.57363  03 25 50.129  +19 00 49.13        15VY170   568  C~2nw7      
2016 09  27.51061  03 25 07.375  +18 58 28.83  24.0w 15VY170   568  C~2nw7      
2016 09  29.48481  03 25 01.382  +18 58 08.32  23.8w 15VY170   568  C~2nw7      
2016 10  05.48792  03 24 41.356  +18 56 59.59  24.1w 15VY170   568  C~2nw7      
2016 10  07.49247  03 24 34.110  +18 56 34.38  23.2w 15VY170   568  C~2nw7      
2016 10  07.58817  03 24 33.735  +18 56 33.25  24.1w 15VY170   568  C~2nw7      
2016 10  09.49252  03 24 26.625  +18 56 08.48  23.8w 15VY170   568  C~2nw7      
2016 10  09.56525  03 24 26.348  +18 56 07.49  24.1w 15VY170   568  C~2nw7      
2016 11  02.50259  03 22 40.959  +18 49 53.96  23.9w 15VY170   568  C~2nw7      
2016 11  04.47870  03 22 31.341  +18 49 19.33  24.0w 15VY170   568  C~2nw7      
2016 12  28.43500  03 18 28.238  +18 34 23.80        15VY170   568  C~2nw7      
2017 01  27.27995  03 17 28.550  +18 30 37.60  24.1w 15VY170   568  C~2nw7      
2017 09  15.56413  03 30 59.283  +19 21 47.23  24.1w 15VY170   568  C~2nw7      
2017 09  20.61305  03 30 48.787  +19 21 14.56  23.9w 15VY170   568  C~2nw7      

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    -0.13       0.00     0.07
     2   0.0133   -109.02     0.08       3.31    -0.03
     3   0.0819  -1128.84     0.02      20.06    -0.01
     4   0.0821  -1132.23    -0.08      20.09    -0.03
     5   0.0875  -1241.53    -0.08      21.35     0.01
     6   0.1662  -3137.27     0.09      36.73     0.06
     7   0.1663  -3140.37     0.08      36.75     0.04
     8   0.1664  -3143.47     0.09      36.84     0.10
     9   0.1749  -3367.83    -0.06      38.18     0.04
    10   0.1936  -3868.05    -0.03      40.88    -0.02
    11   0.1937  -3871.45     0.02      40.94     0.00
    12   0.2457  -5209.35     0.03      47.13     0.01
    13   0.2460  -5218.61     0.07      47.18     0.00
    14   0.3168  -6664.44    -0.05      52.10    -0.01
    15   0.3334  -6903.28    -0.11      52.86     0.05
    16   0.3357  -6932.68    -0.03      52.85    -0.01
    17   0.4125  -7360.47    -0.05      54.30    -0.11
    18   0.4262  -7317.16     0.11      54.42    -0.12
    19   1.0019   4720.17     0.00     145.20     0.00
    20   1.0565   4097.64    -0.02     159.82    -0.03
    21   1.0619   4010.17     0.15     161.10    -0.11
    22   1.0783   3717.81     0.11     165.30    -0.00
    23   1.0838   3611.93    -0.01     166.53    -0.10
    24   1.0841   3606.50    -0.18     166.76     0.05
    25   1.0893   3502.60    -0.04     167.95     0.03
    26   1.0895   3498.55     0.04     167.97    -0.01
    27   1.1550   1956.64     0.00     181.62     0.02
    28   1.1604   1815.76    -0.00     182.54     0.00
    29   1.3082  -1752.59    -0.01     197.50     0.01
    30   1.3899  -2631.15    -0.01     198.35    -0.01
    31   2.0231   9279.89    -0.02     295.96     0.03
    32   2.0369   9127.55    -0.00     300.00     0.07

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.

15VY170    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.556    43.569    43.542
ecceobj         0.028     0.029     0.027
incobj          1.764     1.764     1.764
qmin           41.192    41.203    41.180
qmax           45.437    45.439    45.393
amean          43.226    43.239    43.213
amin           42.897    42.913    42.879
amax           43.561    43.572    43.548
emean           0.027     0.028     0.027
emin            0.006     0.007     0.005
emax            0.044     0.044     0.043
imean           1.243     1.242     1.244
imin            0.226     0.229     0.225
imax            2.000     1.997     2.000
excite_mean     0.036     0.037     0.036
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       182.9     182.0     183.1
kozaiamp        180.0     180.0     179.9