Orbit Fit and Astrometric record for 15VW170

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: 15VW170   
# Created Wed Apr  2 01:10:47 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     39 observations of     39
# Arc:   9.32y
# First observation: 2015/09/07
#  Last observation: 2024/12/31
# Chi-squared of fit:     7.24 DOF:     72 RMS:  0.08
# Min/Max residuals:    -0.19    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.496218E-05  2.081714E-02 -2.240503E-07 -3.774953E-04  2.224333E-02  1.230202E-03
# Covariance matrix:
  1.6078E-13 -8.1995E-14 -1.2297E-15  1.7419E-15  6.7296E-14 -4.8106E-13
 -8.1995E-14  1.0982E-13  1.6067E-15 -2.2862E-15  8.8597E-15  6.3516E-13
 -1.2297E-15  1.6067E-15  5.3062E-14 -1.0323E-14 -5.1740E-18  9.9699E-15
  1.7419E-15 -2.2862E-15 -1.0323E-14  6.7209E-15 -2.7318E-18 -1.4181E-14
  6.7296E-14  8.8597E-15 -5.1740E-18 -2.7318E-18  9.3956E-14  4.4071E-15
 -4.8106E-13  6.3516E-13  9.9699E-15 -1.4181E-14  4.4071E-15  3.9379E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.021993   51.956457    0.933402    0.000298   -0.388568  2457273.129809
# Heliocentric elements and errors
Epoch:              2457272.5000  =  2015/09/07
Mean Anomaly:           75.66910 +/-     0.064
Argument of Peri:       98.97493 +/-     0.066
Long of Asc Node:      231.98494 +/-     0.001
Inclination:             1.03743 +/-     0.000
Eccentricity:         0.03698250 +/-    0.0001
Semi-Major Axis:     45.71163011 +/-    0.0031
Time of Perihelion: 2433544.8580 +/-      20.1
Perihelion:          44.02109991 +/-    0.0055
Aphelion:            47.40216031 +/-    0.0056
Period (y)              309.0639 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           28.67583395 +/-    0.0004
Ecliptic Y           35.13635696 +/-    0.0005
Ecliptic Z            0.01725453 +/-    0.0000
Ecliptic XDOT        -0.00192647 +/-    0.0000
Ecliptic YDOT         0.00169189 +/-    0.0000
Ecliptic ZDOT        -0.00004635 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.35267528 +/-    0.0004
Geocenter to KBO     44.95728258 +/-    0.0006
# Hcoef:  7.71

The following table shows the complete astrometric record for 15VW170. 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 (15VW170) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.62902  03 18 08.047  +18 16 38.79  24.4w 15VW170   568  C~2nw7      
2015 09  12.49264  03 18 00.718  +18 16 09.88  24.6w 15VW170   568  C~2nw7      
2015 10  07.53854  03 16 54.127  +18 11 50.63  24.5w 15VW170   568  C~2nw7      
2015 10  07.59790  03 16 53.913  +18 11 49.81  24.3w 15VW170   568  C~2nw7      
2015 10  09.57780  03 16 46.851  +18 11 22.40  24.4w 15VW170   568  C~2nw7      
2015 11  07.33264  03 14 45.261  +18 03 27.00  23.9r 15VW170   568  C~2nw7      
2015 11  07.37479  03 14 45.063  +18 03 26.29  24.1r 15VW170   568  C~2nw7      
2015 11  07.41697  03 14 44.869  +18 03 25.55  24.2r 15VW170   568  C~2nw7      
2015 11  10.49950  03 14 30.550  +18 02 29.22  24.4w 15VW170   568  C~2nw7      
2015 11  17.34635  03 13 58.705  +18 00 23.74  24.6w 15VW170   568  C~2nw7      
2015 11  17.39294  03 13 58.484  +18 00 22.96  24.5w 15VW170   568  C~2nw7      
2015 12  06.35508  03 12 33.591  +17 54 46.32  24.4w 15VW170   568  C~2nw7      
2016 01  01.34294  03 11 01.801  +17 48 37.94  24.5w 15VW170   568  C~2nw7      
2016 01  08.25043  03 10 44.977  +17 47 29.53  24.4w 15VW170   568  C~2nw7      
2016 02  05.28189  03 10 18.614  +17 45 38.00  24.7w 15VW170   568  C~2nw7      
2016 02  10.30227  03 10 21.464  +17 45 48.10  24.0w 15VW170   568  C~2nw7      
2016 09  07.57363  03 22 59.585  +18 33 32.14        15VW170   568  C~2nw7      
2016 09  27.51061  03 22 18.199  +18 30 54.42  24.6w 15VW170   568  C~2nw7      
2016 09  29.48481  03 22 12.465  +18 30 32.60  24.7w 15VW170   568  C~2nw7      
2016 10  05.48792  03 21 53.408  +18 29 20.30  24.6w 15VW170   568  C~2nw7      
2016 10  07.49247  03 21 46.526  +18 28 54.17  24.5w 15VW170   568  C~2nw7      
2016 10  07.58817  03 21 46.169  +18 28 53.00  24.5w 15VW170   568  C~2nw7      
2016 10  09.49252  03 21 39.414  +18 28 27.47  24.7w 15VW170   568  C~2nw7      
2016 10  09.56525  03 21 39.146  +18 28 26.47  24.6w 15VW170   568  C~2nw7      
2016 11  02.53154  03 19 59.596  +18 22 08.25  24.6w 15VW170   568  C~2nw7      
2016 11  04.40663  03 19 51.037  +18 21 35.49  24.6w 15VW170   568  C~2nw7      
2016 12  24.32550  03 16 16.822  +18 07 48.74  24.4w 15VW170   568  C~2nw7      
2017 01  02.42780  03 15 49.572  +18 06 01.79  24.6w 15VW170   568  C~2nw7      
2017 01  26.34230  03 15 09.495  +18 03 21.79  24.5w 15VW170   568  C~2nw7      
2017 01  27.27995  03 15 08.947  +18 03 19.55  24.4w 15VW170   568  C~2nw7      
2017 09  15.56413  03 27 40.560  +18 49 14.33        15VW170   568  C~2nw7      
2017 09  15.58856  03 27 40.507  +18 49 14.05  24.4w 15VW170   568  C~2nw7      
2017 09  20.61305  03 27 30.334  +18 48 36.45        15VW170   568  C~2nw7      
2017 09  22.57478  03 27 25.834  +18 48 19.60  24.3w 15VW170   568  C~2nw7      
2017 12  13.39064  03 21 52.206  +18 27 39.63  24.6w 15VW170   568  C~2nw7      
2017 12  13.42791  03 21 52.042  +18 27 39.17  24.7w 15VW170   568  C~2nw7      
2024 12  31.109150 03 55 22.857  +20 10 23.58  24.3G 15VW170   G37  C~8cQu      
2024 12  31.160370 03 55 22.675  +20 10 22.92        15VW170   G37  C~8cQu      
2024 12  31.211110 03 55 22.488  +20 10 22.45        15VW170   G37  C~8cQu      

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    -0.03       0.00    -0.02
     2   0.0133      0.00     0.03       0.00    -0.05
     3   0.0819      0.00    -0.05       0.00     0.00
     4   0.0821      0.00    -0.07       0.00     0.00
     5   0.0875      0.00    -0.07       0.00     0.07
     6   0.1662      0.00     0.07       0.00    -0.01
     7   0.1663      0.00     0.06       0.00     0.04
     8   0.1664      0.00     0.13       0.00     0.06
     9   0.1749      0.00    -0.15       0.00    -0.08
    10   0.1936      0.00     0.01       0.00    -0.01
    11   0.1937      0.00    -0.00       0.00     0.06
    12   0.2457      0.00     0.04       0.00     0.04
    13   0.3168      0.00    -0.03       0.00     0.03
    14   0.3357      0.00    -0.01       0.00     0.03
    15   0.4125      0.00    -0.00       0.00     0.01
    16   0.4262      0.00    -0.10       0.00    -0.04
    17   1.0019      0.00    -0.04       0.00     0.02
    18   1.0565      0.00     0.03       0.00     0.04
    19   1.0619      0.00     0.09       0.00    -0.03
    20   1.0783      0.00     0.28       0.00    -0.10
    21   1.0838      0.00     0.21       0.00    -0.19
    22   1.0841      0.00    -0.02       0.00    -0.09
    23   1.0893      0.00    -0.00       0.00     0.01
    24   1.0895      0.00     0.00       0.00     0.00
    25   1.1551      0.00    -0.03       0.00     0.05
    26   1.1602      0.00     0.04       0.00    -0.00
    27   1.2969      0.00     0.18       0.00     0.02
    28   1.3218      0.00    -0.13       0.00    -0.06
    29   1.3873      0.00     0.04       0.00    -0.01
    30   1.3899      0.00    -0.01       0.00     0.06
    31   2.0231      0.00    -0.01       0.00     0.04
    32   2.0232      0.00    -0.11       0.00    -0.07
    33   2.0369      0.00    -0.14       0.00     0.09
    34   2.0423      0.00     0.03       0.00    -0.05
    35   2.2663      0.00     0.07       0.00     0.02
    36   2.2664      0.00    -0.10       0.00     0.13
    37   9.3155      0.00    -0.02       0.00     0.06
    38   9.3156      0.00     0.03       0.00    -0.07
    39   9.3158      0.00    -0.03       0.00    -0.00

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.

15VW170    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        46.176    46.176    46.176
ecceobj         0.044     0.044     0.044
incobj          1.032     1.032     1.032
qmin           43.269    43.268    43.266
qmax           48.608    48.609    48.606
amean          45.818    45.819    45.819
amin           45.460    45.454    45.462
amax           46.200    46.200    46.199
emean           0.039     0.040     0.039
emin            0.026     0.026     0.026
emax            0.052     0.052     0.052
imean           2.560     2.560     2.560
imin            2.156     2.156     2.156
imax            2.903     2.903     2.903
excite_mean     0.060     0.060     0.060
fracstop        1.000     1.000     1.000
cjmean          3.119     3.120     3.119

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       179.7     179.7     179.9
kozaiamp        180.0     179.9     180.0