Orbit Fit and Astrometric record for 15VT170

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: 15VT170   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting     39 observations of     39
# Arc:   2.27y
# First observation: 2015/09/07
#  Last observation: 2017/12/16
Preliminary a, adot, b, bdot, g, gdot:
  -0.000080   0.021680   0.000000  -0.000416   0.022960   0.000000
# Chi-squared of fit:     3.97 DOF:     72 RMS:  0.06
# Min/Max residuals:    -0.14    0.14
# Exact a, adot, b, bdot, g, gdot:
  1.538209E-05  2.154761E-02 -3.698824E-07 -4.144400E-04  2.292226E-02  9.359486E-04
# Covariance matrix:
  1.8949E-13 -3.6608E-14  7.7344E-17 -1.2501E-15  1.2170E-13  1.6588E-12
 -3.6608E-14  2.2904E-13  9.1997E-16 -4.2482E-15  1.2882E-13  5.4712E-12
  7.7344E-17  9.1997E-16  1.0112E-13 -7.3636E-14  6.4305E-16  3.4365E-14
 -1.2501E-15 -4.2482E-15 -7.3636E-14  8.4863E-14 -3.9731E-15 -1.6159E-13
  1.2170E-13  1.2882E-13  6.4305E-16 -3.9731E-15  2.1466E-13  5.1717E-12
  1.6588E-12  5.4712E-12  3.4365E-14 -1.6159E-13  5.1717E-12  2.0826E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.382959   51.907355    0.933068    0.002751   -0.389358  2457273.129809
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          124.89023 +/-     0.963
Argument of Peri:       33.66160 +/-     0.961
Long of Asc Node:      249.85885 +/-     0.012
Inclination:             1.15602 +/-     0.001
Eccentricity:         0.02462311 +/-    0.0005
Semi-Major Axis:     43.39354508 +/-    0.0028
Time of Perihelion: 2421049.3623 +/-     279.4
Perihelion:          42.32506111 +/-    0.0225
Aphelion:            44.46202905 +/-    0.0226
Period (y)              285.8551 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           27.88406947 +/-    0.0006
Ecliptic Y           34.06386281 +/-    0.0007
Ecliptic Z            0.29157924 +/-    0.0000
Ecliptic XDOT        -0.00195820 +/-    0.0000
Ecliptic YDOT         0.00166960 +/-    0.0000
Ecliptic ZDOT        -0.00004870 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.02218871 +/-    0.0006
Geocenter to KBO     43.62570897 +/-    0.0009
# Hcoef:  8.01

The following table shows the complete astrometric record for 15VT170. 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 (15VT170) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.62902  03 17 32.435  +18 36 48.38  24.4w 15VT170   568  C~2nw7      
2015 09  12.49264  03 17 24.840  +18 36 20.61  24.7w 15VT170   568  C~2nw7      
2015 10  07.53854  03 16 15.903  +18 32 01.55  24.7w 15VT170   568  C~2nw7      
2015 10  07.59790  03 16 15.675  +18 32 00.71  24.4w 15VT170   568  C~2nw7      
2015 10  09.57780  03 16 08.379  +18 31 32.85  24.6w 15VT170   568  C~2nw7      
2015 11  07.33264  03 14 02.764  +18 23 26.05  24.6r 15VT170   568  C~2nw7      
2015 11  07.37479  03 14 02.554  +18 23 25.31  24.2r 15VT170   568  C~2nw7      
2015 11  07.41697  03 14 02.350  +18 23 24.54  24.4r 15VT170   568  C~2nw7      
2015 11  10.49950  03 13 47.597  +18 22 26.40  24.3w 15VT170   568  C~2nw7      
2015 11  17.39294  03 13 14.496  +18 20 15.64  24.6w 15VT170   568  C~2nw7      
2015 12  06.35508  03 11 46.987  +18 14 25.16  25.0w 15VT170   568  C~2nw7      
2015 12  06.49265  03 11 46.373  +18 14 22.72  24.5w 15VT170   568  C~2nw7      
2016 01  01.34294  03 10 12.616  +18 07 56.74  24.7w 15VT170   568  C~2nw7      
2016 01  07.40549  03 09 57.274  +18 06 51.50  24.4w 15VT170   568  C~2nw7      
2016 01  08.25043  03 09 55.377  +18 06 43.30  24.7w 15VT170   568  C~2nw7      
2016 02  05.28189  03 09 28.788  +18 04 35.88  24.8w 15VT170   568  C~2nw7      
2016 02  10.30227  03 09 31.860  +18 04 44.26  24.7w 15VT170   568  C~2nw7      
2016 09  07.57363  03 22 34.953  +18 54 15.94        15VT170   568  C~2nw7      
2016 09  27.51061  03 21 52.123  +18 51 41.13  24.6w 15VT170   568  C~2nw7      
2016 09  29.48481  03 21 46.191  +18 51 19.25  24.6w 15VT170   568  C~2nw7      
2016 10  07.49247  03 21 19.362  +18 49 40.49  25.1w 15VT170   568  C~2nw7      
2016 10  07.58817  03 21 19.002  +18 49 39.13  24.8w 15VT170   568  C~2nw7      
2016 10  09.49252  03 21 12.016  +18 49 13.18  24.4w 15VT170   568  C~2nw7      
2016 10  09.56525  03 21 11.741  +18 49 12.23  24.5w 15VT170   568  C~2nw7      
2016 11  02.53154  03 19 28.885  +18 42 45.73  24.6w 15VT170   568  C~2nw7      
2016 11  02.53733  03 19 28.854  +18 42 45.72  24.7w 15VT170   568  C~2nw7      
2016 11  04.40663  03 19 20.048  +18 42 12.16  24.7w 15VT170   568  C~2nw7      
2016 11  04.41248  03 19 20.015  +18 42 12.06  24.6w 15VT170   568  C~2nw7      
2016 12  24.30698  03 15 39.188  +18 27 50.74  24.9w 15VT170   568  C~2nw7      
2016 12  24.32550  03 15 39.119  +18 27 50.42  24.9w 15VT170   568  C~2nw7      
2017 01  02.40920  03 15 11.183  +18 25 57.02  24.7w 15VT170   568  C~2nw7      
2017 01  02.42780  03 15 11.127  +18 25 56.82  24.7w 15VT170   568  C~2nw7      
2017 01  26.29981  03 14 30.177  +18 23 01.48  24.8w 15VT170   568  C~2nw7      
2017 01  27.27995  03 14 29.609  +18 22 58.46  24.7w 15VT170   568  C~2nw7      
2017 09  15.56413  03 27 26.807  +19 10 32.18        15VT170   568  C~2nw7      
2017 09  15.60695  03 27 26.710  +19 10 31.81  24.8w 15VT170   568  C~2nw7      
2017 09  20.61305  03 27 16.250  +19 09 55.20        15VT170   568  C~2nw7      
2017 09  22.59291  03 27 11.537  +19 09 38.57  24.6w 15VT170   568  C~2nw7      
2017 12  16.36391  03 21 14.916  +18 47 39.00  24.8w 15VT170   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    -0.11       0.00     0.02
     2   0.0133   -111.48     0.14       1.15    -0.04
     3   0.0819  -1125.35     0.01       5.73    -0.01
     4   0.0821  -1128.70    -0.11       5.77     0.01
     5   0.0875  -1236.15    -0.03       5.93    -0.02
     6   0.1662  -3088.76     0.05       4.84     0.02
     7   0.1663  -3091.84    -0.02       4.91     0.08
     8   0.1664  -3094.84    -0.01       4.93     0.09
     9   0.1749  -3312.80     0.06       4.25    -0.05
    10   0.1937  -3802.00     0.01       2.70     0.03
    11   0.2457  -5097.26     0.03      -4.10     0.02
    12   0.2460  -5106.34    -0.07      -4.12     0.04
    13   0.3168  -6498.11     0.03     -18.42     0.04
    14   0.3334  -6726.55     0.07     -22.46     0.00
    15   0.3357  -6754.83    -0.07     -23.09    -0.02
    16   0.4125  -7154.71    -0.08     -43.70    -0.11
    17   0.4262  -7110.21     0.07     -47.44    -0.01
    18   1.0019   4422.42    -0.02     -85.21    -0.02
    19   1.0565   3794.91     0.04     -81.45    -0.03
    20   1.0619   3707.88     0.05     -81.30    -0.14
    21   1.0838   3314.30     0.07     -80.27     0.05
    22   1.0841   3309.01    -0.04     -80.29     0.00
    23   1.0893   3206.46    -0.07     -80.21    -0.01
    24   1.0895   3202.44    -0.02     -80.13     0.03
    25   1.1551   1691.14    -0.03     -81.08    -0.08
    26   1.1551   1690.71    -0.06     -80.98     0.03
    27   1.1602   1561.17     0.09     -81.34    -0.02
    28   1.1603   1560.69     0.02     -81.31    -0.00
    29   1.2969  -1695.01     0.05    -100.03    -0.04
    30   1.2969  -1696.04    -0.02    -100.08    -0.09
    31   1.3218  -2109.41     0.02    -105.47     0.00
    32   1.3218  -2110.23    -0.04    -105.45     0.03
    33   1.3872  -2718.72    -0.02    -121.62     0.10
    34   1.3899  -2727.32     0.05    -122.41     0.02
    35   2.0231   8677.91     0.06    -169.20     0.00
    36   2.0232   8676.49    -0.14    -169.22    -0.04
    37   2.0369   8523.57     0.09    -168.32     0.03
    38   2.0423   8454.64     0.03    -168.04     0.03
    39   2.2744   3222.37    -0.07    -181.77     0.06

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.

15VT170    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.809    43.820    43.800
ecceobj         0.025     0.026     0.024
incobj          1.152     1.152     1.152
qmin           41.660    41.635    41.694
qmax           45.505    45.518    45.411
amean          43.489    43.499    43.479
amin           43.162    43.161    43.149
amax           43.841    43.843    43.822
emean           0.022     0.023     0.021
emin            0.004     0.005     0.003
emax            0.038     0.039     0.037
imean           3.008     3.008     3.009
imin            2.248     2.249     2.250
imax            3.696     3.695     3.696
excite_mean     0.057     0.057     0.057
fracstop        1.000     1.000     1.000
cjmean          3.091     3.092     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       175.4     175.8     174.6
kozaiamp        180.0     180.0     180.0