Orbit Fit and Astrometric record for 15VY166

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: 15VY166   
# Created Fri Dec  3 02:13:38 2021
# Orbit generated from Bernstein formalism
# Fitting     30 observations of     30
# Arc:   2.27y
# First observation: 2015/09/07
#  Last observation: 2017/12/13
Preliminary a, adot, b, bdot, g, gdot:
  -0.000088   0.023389   0.000000   0.000497   0.023874   0.000000
# Chi-squared of fit:     7.60 DOF:     54 RMS:  0.09
# Min/Max residuals:    -0.24    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.516773E-05  2.324461E-02  4.740689E-07  4.945177E-04  2.381976E-02  2.096187E-03
# Covariance matrix:
  2.2687E-13 -2.7222E-14 -3.3533E-16  1.9543E-15  1.5436E-13  2.0001E-12
 -2.7222E-14  3.2600E-13 -1.9910E-15  8.1265E-15  1.9226E-13  8.1907E-12
 -3.3533E-16 -1.9910E-15  1.2043E-13 -8.5385E-14 -1.4960E-15 -7.2656E-14
  1.9543E-15  8.1265E-15 -8.5385E-14  1.0115E-13  6.7766E-15  2.9582E-13
  1.5436E-13  1.9226E-13 -1.4960E-15  6.7766E-15  2.8414E-13  6.8649E-12
  2.0001E-12  8.1907E-12 -7.2656E-14  2.9582E-13  6.8649E-12  2.9812E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.205660   52.523523    0.937202   -0.001213   -0.379309  2457273.129809
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:           62.70377 +/-     0.117
Argument of Peri:      280.18667 +/-     0.191
Long of Asc Node:       60.78744 +/-     0.005
Inclination:             1.23078 +/-     0.001
Eccentricity:         0.07151160 +/-    0.0007
Semi-Major Axis:     43.61407488 +/-    0.0057
Time of Perihelion: 2438946.1084 +/-      34.1
Perihelion:          40.49516241 +/-    0.0319
Aphelion:            46.73298735 +/-    0.0321
Period (y)              288.0369 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           26.51362619 +/-    0.0006
Ecliptic Y           33.04734722 +/-    0.0007
Ecliptic Z           -0.15066434 +/-    0.0000
Ecliptic XDOT        -0.00197545 +/-    0.0000
Ecliptic YDOT         0.00181053 +/-    0.0000
Ecliptic ZDOT         0.00005603 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.36888282 +/-    0.0007
Geocenter to KBO     41.98195298 +/-    0.0009
# Hcoef:  9.04

The following table shows the complete astrometric record for 15VY166. 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 (15VY166) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.62902  03 20 41.304  +18 12 10.21  25.9w 15VY166   568  C~2lVg      
2015 10  07.53854  03 19 24.364  +18 07 21.63  25.8w 15VY166   568  C~2lVh      
2015 10  07.59790  03 19 24.124  +18 07 20.91  26.0w 15VY166   568  C~2lVh      
2015 10  09.57780  03 19 16.680  +18 06 52.85  25.6w 15VY166   568  C~2lVh      
2015 11  07.33264  03 17 07.715  +17 58 46.78  24.7r 15VY166   568  C~2lVh      
2015 11  07.37479  03 17 07.507  +17 58 45.93  25.3r 15VY166   568  C~2lVh      
2015 11  07.41697  03 17 07.306  +17 58 44.98  25.4r 15VY166   568  C~2lVh      
2015 11  10.49950  03 16 52.056  +17 57 47.62  25.4w 15VY166   568  C~2lVh      
2015 11  17.34635  03 16 18.091  +17 55 38.99  25.4w 15VY166   568  C~2lVh      
2015 12  06.35508  03 14 47.093  +17 49 53.79  25.2w 15VY166   568  C~2lVh      
2016 01  01.34294  03 13 08.592  +17 43 41.76  25.5w 15VY166   568  C~2lVh      
2016 01  07.40549  03 12 52.464  +17 42 41.87  26.1w 15VY166   568  C~2lVh      
2016 01  08.25043  03 12 50.472  +17 42 34.28  25.3w 15VY166   568  C~2lVh      
2016 02  05.28189  03 12 21.643  +17 40 57.00  25.1w 15VY166   568  C~2lVh      
2016 09  29.48481  03 25 15.080  +18 30 50.79  25.0w 15VY166   568  C~2lVh      
2016 10  05.48792  03 24 55.101  +18 29 38.66  25.7w 15VY166   568  C~2lVh      
2016 10  07.49247  03 24 47.882  +18 29 12.28  26.2w 15VY166   568  C~2lVh      
2016 10  07.58817  03 24 47.516  +18 29 11.04  25.9w 15VY166   568  C~2lVh      
2016 10  09.49252  03 24 40.416  +18 28 45.18  25.3w 15VY166   568  C~2lVh      
2016 10  09.56525  03 24 40.137  +18 28 44.07  25.5w 15VY166   568  C~2lVh      
2016 11  02.50259  03 22 54.919  +18 22 21.07  25.5w 15VY166   568  C~2lVh      
2016 11  04.47870  03 22 45.319  +18 21 45.83  25.4w 15VY166   568  C~2lVh      
2016 12  25.28177  03 18 53.138  +18 07 33.51  25.7w 15VY166   568  C~2lVh      
2016 12  28.42845  03 18 42.481  +18 06 54.60  25.3w 15VY166   568  C~2lVh      
2016 12  28.44773  03 18 42.412  +18 06 54.28  25.6w 15VY166   568  C~2lVh      
2017 01  27.27995  03 17 42.865  +18 03 22.72  25.4w 15VY166   568  C~2lVh      
2017 09  15.56413  03 31 15.134  +18 54 05.14  25.8w 15VY166   568  C~2lVh      
2017 09  20.61305  03 31 04.686  +18 53 29.05  25.5w 15VY166   568  C~2lVh      
2017 12  13.39064  03 25 06.178  +18 32 23.31  25.1w 15VY166   568  C~2lVh      
2017 12  13.42791  03 25 06.006  +18 32 22.60  25.6w 15VY166   568  C~2lVh      

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     0.05       0.00    -0.03
     2   0.0819  -1133.94     0.11       1.31    -0.08
     3   0.0821  -1137.43    -0.07       1.50     0.08
     4   0.0875  -1247.21    -0.12       1.60    -0.02
     5   0.1662  -3149.88    -0.03       6.59     0.04
     6   0.1663  -3152.96    -0.02       6.54    -0.04
     7   0.1664  -3155.98     0.08       6.36    -0.24
     8   0.1749  -3381.06    -0.07       7.46     0.03
     9   0.1936  -3882.68     0.04       9.34     0.04
    10   0.2457  -5227.45    -0.08      15.84    -0.10
    11   0.3168  -6683.92    -0.04      27.73     0.05
    12   0.3334  -6922.25     0.15      30.99     0.20
    13   0.3357  -6951.75     0.09      31.22     0.01
    14   0.4125  -7375.28    -0.11      46.72     0.19
    15   1.0619   4054.71     0.12     103.29    -0.05
    16   1.0783   3761.41     0.02     104.17     0.17
    17   1.0838   3655.34     0.01     104.21    -0.03
    18   1.0841   3649.99    -0.07     104.31     0.03
    19   1.0893   3545.69    -0.02     104.46    -0.04
    20   1.0895   3541.57    -0.00     104.37    -0.16
    21   1.1550   1995.73    -0.06     108.91     0.05
    22   1.1604   1854.58    -0.02     109.24    -0.08
    23   1.2995  -1561.13     0.18     127.11    -0.02
    24   1.3081  -1717.97    -0.03     128.60     0.00
    25   1.3082  -1719.00    -0.13     128.54    -0.06
    26   1.3899  -2594.01     0.05     143.23    -0.01
    27   2.0231   9361.73     0.12     203.90     0.01
    28   2.0369   9208.82    -0.08     204.55     0.13
    29   2.2663   3955.07     0.05     224.42     0.02
    30   2.2664   3952.52    -0.10     224.34    -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.

15VY166    quality flag:3

Type:         7:4EEE    7:4EEE    7:4EEE

axisobj        44.065    44.085    44.045
ecceobj         0.080     0.081     0.078
incobj          1.228     1.228     1.228
qmin           39.904    39.875    39.873
qmax           47.843    47.864    47.823
amean          43.726    43.726    43.725
amin           43.342    43.353    43.349
amax           44.128    44.129    44.120
emean           0.074     0.074     0.072
emin            0.062     0.063     0.057
emax            0.085     0.085     0.085
imean           1.045     1.035     1.024
imin            0.166     0.158     0.101
imax            1.659     1.671     1.637
excite_mean     0.076     0.077     0.074
fracstop        1.000     1.000     1.000
cjmean          3.091     3.091     3.092

libcent 0       183.4     177.3     180.7
libamp  0       127.3     126.3     167.7
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       233.2     255.4     181.4
kozaiamp        180.0     179.8     179.9