Orbit Fit and Astrometric record for 15VX170

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: 15VX170   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting     26 observations of     26
# Arc:   2.04y
# First observation: 2015/09/07
#  Last observation: 2017/09/20
Preliminary a, adot, b, bdot, g, gdot:
  -0.000069   0.021546   0.000001   0.000991   0.022544   0.000000
# Chi-squared of fit:     8.55 DOF:     46 RMS:  0.10
# Min/Max residuals:    -0.33    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.510823E-05  2.134545E-02  4.328559E-07  9.842029E-04  2.241843E-02 -7.553458E-04
# Covariance matrix:
  2.8927E-13 -8.0630E-14 -1.2842E-15  4.6771E-15  1.9812E-13  2.6364E-12
 -8.0630E-14  3.7154E-13 -3.7998E-15  1.5669E-14  1.7066E-13  8.8479E-12
 -1.2842E-15 -3.7998E-15  1.4764E-13 -1.1993E-13 -3.7445E-15 -1.6022E-13
  4.6771E-15  1.5669E-14 -1.1993E-13  1.5665E-13  1.4673E-14  6.5595E-13
  1.9812E-13  1.7066E-13 -3.7445E-15  1.4673E-14  3.4265E-13  8.2794E-12
  2.6364E-12  8.8479E-12 -1.6022E-13  6.5595E-13  8.2794E-12  3.7036E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.113662   52.194500    0.935008    0.000912   -0.384686  2457273.129809
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          304.33919 +/-     0.289
Argument of Peri:       64.84135 +/-     0.384
Long of Asc Node:       48.57309 +/-     0.001
Inclination:             2.65120 +/-     0.001
Eccentricity:         0.06809769 +/-    0.0008
Semi-Major Axis:     46.63351964 +/-    0.0065
Time of Perihelion: 2475254.7655 +/-      93.3
Perihelion:          43.45788486 +/-    0.0385
Aphelion:            49.80915442 +/-    0.0386
Period (y)              318.4604 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           28.31320452 +/-    0.0007
Ecliptic Y           34.97366029 +/-    0.0009
Ecliptic Z            0.08851556 +/-    0.0000
Ecliptic XDOT        -0.00211819 +/-    0.0000
Ecliptic YDOT         0.00151844 +/-    0.0000
Ecliptic ZDOT         0.00012007 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.99780327 +/-    0.0008
Geocenter to KBO     44.60615788 +/-    0.0012
# Hcoef:  8.56

The following table shows the complete astrometric record for 15VX170. 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 (15VX170) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.62902  03 19 00.237  +18 25 38.40  25.1w 15VX170   568  C~2nw7      
2015 10  07.53854  03 17 46.097  +18 21 18.03  25.4w 15VX170   568  C~2nw7      
2015 10  07.59790  03 17 45.884  +18 21 17.26  25.4w 15VX170   568  C~2nw7      
2015 11  07.33264  03 15 36.207  +18 13 19.89  25.0r 15VX170   568  C~2nw7      
2015 11  07.37479  03 15 36.006  +18 13 19.08  25.1r 15VX170   568  C~2nw7      
2015 11  07.41697  03 15 35.802  +18 13 18.26  25.4r 15VX170   568  C~2nw7      
2015 11  10.49950  03 15 21.349  +18 12 24.33  25.3w 15VX170   568  C~2nw7      
2015 11  17.34635  03 14 49.190  +18 10 23.77  25.3w 15VX170   568  C~2nw7      
2015 11  17.39294  03 14 48.960  +18 10 22.98  25.0w 15VX170   568  C~2nw7      
2016 01  01.34294  03 11 50.064  +17 59 05.88  25.4w 15VX170   568  C~2nw7      
2016 01  07.40549  03 11 34.785  +17 58 08.18  25.7w 15VX170   568  C~2nw7      
2016 01  08.25043  03 11 32.931  +17 58 01.10  24.9w 15VX170   568  C~2nw7      
2016 09  07.57363  03 23 55.186  +18 47 28.72        15VX170   568  C~2nw7      
2016 09  27.51061  03 23 13.695  +18 45 11.76  25.6w 15VX170   568  C~2nw7      
2016 09  29.48481  03 23 07.944  +18 44 52.03  25.1w 15VX170   568  C~2nw7      
2016 10  05.48792  03 22 48.744  +18 43 45.55  25.3w 15VX170   568  C~2nw7      
2016 10  07.58817  03 22 41.450  +18 43 20.17  25.2w 15VX170   568  C~2nw7      
2016 10  09.49252  03 22 34.663  +18 42 56.54  25.2w 15VX170   568  C~2nw7      
2016 10  09.56525  03 22 34.372  +18 42 55.58  25.0w 15VX170   568  C~2nw7      
2016 11  02.53154  03 20 53.873  +18 36 57.96  25.3w 15VX170   568  C~2nw7      
2016 11  04.40663  03 20 45.213  +18 36 26.62  24.8w 15VX170   568  C~2nw7      
2016 12  24.32550  03 17 08.059  +18 23 10.47  25.0w 15VX170   568  C~2nw7      
2017 01  02.42780  03 16 40.347  +18 21 27.64  25.3w 15VX170   568  C~2nw7      
2017 01  27.27995  03 15 58.740  +18 18 56.23  25.4w 15VX170   568  C~2nw7      
2017 09  15.56413  03 28 41.072  +19 08 19.62  25.7w 15VX170   568  C~2nw7      
2017 09  20.61305  03 28 30.830  +19 07 47.51  25.6w 15VX170   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    -0.01       0.00     0.05
     2   0.0819  -1086.76    -0.06      20.52    -0.00
     3   0.0821  -1089.89    -0.04      20.56    -0.01
     4   0.1662  -2997.59     0.15      39.98     0.11
     5   0.1663  -3000.56     0.11      39.95     0.04
     6   0.1664  -3003.59     0.03      39.92    -0.04
     7   0.1749  -3216.50    -0.18      41.75    -0.02
     8   0.1936  -3690.49     0.07      45.57    -0.05
     9   0.1937  -3693.86    -0.02      45.67     0.00
    10   0.3168  -6334.66     0.26      67.43    -0.04
    11   0.3334  -6560.36    -0.33      69.94    -0.05
    12   0.3357  -6587.78     0.03      70.17    -0.13
    13   1.0019   4388.82    -0.00     203.69    -0.04
    14   1.0565   3783.81    -0.16     218.92     0.06
    15   1.0619   3699.76     0.14     220.36     0.04
    16   1.0783   3418.98     0.09     224.66    -0.05
    17   1.0841   3312.29    -0.20     226.21    -0.04
    18   1.0893   3213.00     0.15     227.65     0.08
    19   1.0895   3208.75    -0.14     227.76     0.12
    20   1.1551   1736.33     0.11     243.62     0.07
    21   1.1602   1609.30     0.08     244.65    -0.02
    22   1.2969  -1580.66     0.01     269.42     0.04
    23   1.3218  -1988.35    -0.06     272.61    -0.13
    24   1.3899  -2599.83    -0.01     280.80     0.11
    25   2.0231   8632.03    -0.01     413.78    -0.08
    26   2.0369   8483.19     0.00     418.05    -0.02

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.

15VX170    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        47.086    47.102    47.071
ecceobj         0.069     0.070     0.068
incobj          2.640     2.641     2.640
qmin           42.712    42.652    42.785
qmax           50.945    51.048    50.885
amean          46.712    46.727    46.697
amin           46.339    46.347    46.320
amax           47.105    47.142    47.092
emean           0.069     0.070     0.068
emin            0.057     0.058     0.056
emax            0.082     0.083     0.081
imean           2.021     2.023     2.020
imin            1.661     1.663     1.661
imax            2.368     2.370     2.364
excite_mean     0.078     0.079     0.077
fracstop        1.000     1.000     1.000
cjmean          3.128     3.128     3.128

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       167.1     167.2     166.6
kozaiamp        179.9     179.9     180.0