Orbit Fit and Astrometric record for 15VD170

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: 15VD170   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     39 observations of     39
# Arc:   9.20y
# First observation: 2015/08/20
#  Last observation: 2024/11/01
# Chi-squared of fit:     8.66 DOF:     72 RMS:  0.08
# Min/Max residuals:    -0.21    0.35
# Exact a, adot, b, bdot, g, gdot:
  1.259667E-05  1.621227E-02  2.369409E-06  2.900635E-03  1.985362E-02  2.268664E-03
# Covariance matrix:
  1.8107E-13 -8.0175E-14  8.8000E-15 -1.3598E-14  8.9787E-14 -4.9414E-13
 -8.0175E-14  1.1228E-13 -1.2993E-14  2.0887E-14  3.6950E-15  7.7127E-13
  8.8000E-15 -1.2993E-14  5.2071E-14 -1.2186E-14 -3.3296E-16 -9.4954E-14
 -1.3598E-14  2.0887E-14 -1.2186E-14  1.0912E-14  1.1420E-15  1.5279E-13
  8.9787E-14  3.6950E-15 -3.3296E-16  1.1420E-15  1.0217E-13  5.0996E-14
 -4.9414E-13  7.7127E-13 -9.4954E-14  1.5279E-13  5.0996E-14  5.6439E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.425106   52.963648    1.011870   -0.000417   -0.074261  2457255.076589
# Heliocentric elements and errors
Epoch:              2457254.5000  =  2015/08/20
Mean Anomaly:          126.53241 +/-     0.053
Argument of Peri:      218.32007 +/-     0.046
Long of Asc Node:       54.19348 +/-     0.000
Inclination:            10.12899 +/-     0.000
Eccentricity:         0.15561862 +/-    0.0001
Semi-Major Axis:     45.60572621 +/-    0.0037
Time of Perihelion: 2417715.4020 +/-      17.3
Perihelion:          38.50862587 +/-    0.0043
Aphelion:            52.70282656 +/-    0.0052
Period (y)              307.9905 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           31.18570858 +/-    0.0005
Ecliptic Y           39.65552461 +/-    0.0006
Ecliptic Z           -0.37356586 +/-    0.0000
Ecliptic XDOT        -0.00159643 +/-    0.0000
Ecliptic YDOT         0.00159234 +/-    0.0000
Ecliptic ZDOT         0.00039773 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   50.45038095 +/-    0.0006
Geocenter to KBO     50.36859210 +/-    0.0008
# Hcoef:  7.09

The following table shows the complete astrometric record for 15VD170. 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 (15VD170) followed by the observatory code and reference code for the source of the astrometry.

2015 08  20.57580  03 22 42.882  +18 06 07.52  24.4w 15VD170   568  C~2nw4      
2015 09  07.61675  03 22 33.739  +18 05 54.97  24.5w 15VD170   568  C~2nw4      
2015 10  07.52101  03 21 25.848  +18 02 20.48  24.5w 15VD170   568  C~2nw4      
2015 10  07.58040  03 21 25.658  +18 02 19.88  24.4w 15VD170   568  C~2nw4      
2015 10  09.56029  03 21 19.182  +18 01 58.33  24.5w 15VD170   568  C~2nw4      
2015 11  06.33360  03 19 31.625  +17 55 55.84  24.0r 15VD170   568  C~2nw4      
2015 11  06.39716  03 19 31.357  +17 55 55.11  24.1r 15VD170   568  C~2nw4      
2015 11  06.40423  03 19 31.311  +17 55 54.88  24.0r 15VD170   568  C~2nw4      
2015 11  06.47375  03 19 31.009  +17 55 53.90  24.5r 15VD170   568  C~2nw4      
2015 11  07.49015  03 19 26.693  +17 55 39.15  24.4w 15VD170   568  C~2nw4      
2015 11  17.47136  03 18 43.820  +17 53 13.56  24.3w 15VD170   568  C~2nw4      
2015 11  17.55969  03 18 43.425  +17 53 12.39  24.1w 15VD170   568  C~2nw4      
2015 12  06.33759  03 17 25.206  +17 48 48.13  24.3w 15VD170   568  C~2nw4      
2015 12  06.47504  03 17 24.659  +17 48 46.39  24.1w 15VD170   568  C~2nw4      
2015 12  31.35875  03 16 00.497  +17 44 12.24  24.3w 15VD170   568  C~2nw4      
2016 01  07.38812  03 15 43.207  +17 43 20.23  25.0w 15VD170   568  C~2nw4      
2016 01  07.42286  03 15 43.118  +17 43 19.79  24.3w 15VD170   568  C~2nw4      
2016 01  08.24465  03 15 41.335  +17 43 14.67  24.4w 15VD170   568  C~2nw4      
2016 02  04.37827  03 15 11.471  +17 42 16.79  23.5w 15VD170   568  C~2nw4      
2016 02  11.24103  03 15 13.447  +17 42 39.07  24.4w 15VD170   568  C~2nw4      
2016 09  07.57363  03 26 10.229  +18 29 31.68        15VD170   568  C~2nw4      
2016 09  27.51061  03 25 31.713  +18 27 40.16  24.4w 15VD170   568  C~2nw4      
2016 09  29.48481  03 25 26.424  +18 27 23.56  24.4w 15VD170   568  C~2nw4      
2016 10  05.48792  03 25 08.835  +18 26 28.37  24.3w 15VD170   568  C~2nw4      
2016 10  07.49247  03 25 02.514  +18 26 08.35  23.1w 15VD170   568  C~2nw4      
2016 10  07.58817  03 25 02.190  +18 26 07.37  24.4w 15VD170   568  C~2nw4      
2016 10  09.49252  03 24 55.966  +18 25 47.44  24.4w 15VD170   568  C~2nw4      
2016 10  09.56525  03 24 55.720  +18 25 46.72  24.3w 15VD170   568  C~2nw4      
2016 11  02.50259  03 23 24.253  +18 20 48.46  24.3w 15VD170   568  C~2nw4      
2016 11  04.47870  03 23 15.928  +18 20 20.96  24.3w 15VD170   568  C~2nw4      
2016 12  28.42845  03 19 44.471  +18 08 47.58  24.4w 15VD170   568  C~2nw4      
2016 12  28.44773  03 19 44.413  +18 08 47.42  24.3w 15VD170   568  C~2nw4      
2017 09  15.56413  03 29 36.374  +18 52 21.37  24.3w 15VD170   568  C~2nw4      
2017 09  20.61305  03 29 26.757  +18 51 55.35  24.6w 15VD170   568  C~2nw4      
2017 12  13.39064  03 24 14.023  +18 35 26.22  24.4w 15VD170   568  C~2nw4      
2017 12  13.42791  03 24 13.876  +18 35 25.85  24.3w 15VD170   568  C~2nw4      
2024 11  01.378760 03 52 56.024  +21 21 11.61  24.2G 15VD170   G37  C~8SY2      
2024 11  01.425880 03 52 55.814  +21 21 11.23        15VD170   G37  C~8SY2      
2024 11  01.473860 03 52 55.639  +21 21 10.73        15VD170   G37  C~8SY2      

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     0.07       0.00     0.00
     2   0.0494      0.00    -0.08       0.00     0.01
     3   0.1313      0.00    -0.07       0.00     0.01
     4   0.1314      0.00     0.01       0.00     0.04
     5   0.1369      0.00    -0.03       0.00    -0.05
     6   0.2129      0.00    -0.01       0.00    -0.04
     7   0.2131      0.00     0.08       0.00     0.14
     8   0.2131      0.00    -0.15       0.00     0.01
     9   0.2133      0.00    -0.17       0.00     0.03
    10   0.2161      0.00     0.01       0.00    -0.02
    11   0.2434      0.00     0.04       0.00    -0.01
    12   0.2436      0.00    -0.11       0.00     0.13
    13   0.2950      0.00     0.05       0.00     0.00
    14   0.2954      0.00     0.12       0.00     0.09
    15   0.3635      0.00    -0.01       0.00    -0.06
    16   0.3828      0.00     0.03       0.00     0.10
    17   0.3829      0.00    -0.12       0.00    -0.11
    18   0.3851      0.00    -0.11       0.00    -0.03
    19   0.4594      0.00     0.35       0.00     0.12
    20   0.4782      0.00    -0.04       0.00    -0.02
    21   1.0513      0.00     0.07       0.00     0.03
    22   1.1059      0.00     0.04       0.00     0.08
    23   1.1113      0.00     0.16       0.00    -0.11
    24   1.1278      0.00    -0.01       0.00    -0.11
    25   1.1332      0.00     0.17       0.00    -0.01
    26   1.1335      0.00     0.03       0.00    -0.01
    27   1.1387      0.00    -0.04       0.00    -0.07
    28   1.1389      0.00    -0.03       0.00    -0.01
    29   1.2045      0.00     0.02       0.00    -0.02
    30   1.2099      0.00    -0.03       0.00    -0.04
    31   1.3576      0.00    -0.02       0.00    -0.03
    32   1.3576      0.00    -0.04       0.00    -0.01
    33   2.0725      0.00     0.01       0.00     0.02
    34   2.0863      0.00     0.00       0.00     0.04
    35   2.3157      0.00     0.04       0.00    -0.09
    36   2.3158      0.00    -0.03       0.00    -0.01
    37   9.2014      0.00     0.04       0.00    -0.05
    38   9.2015      0.00    -0.21       0.00     0.05
    39   9.2016      0.00     0.12       0.00     0.04

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.

15VD170    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        46.029    46.029    46.029
ecceobj         0.153     0.153     0.153
incobj         10.085    10.085    10.085
qmin           37.948    37.949    37.947
qmax           53.808    53.812    53.803
amean          45.715    45.716    45.715
amin           45.320    45.322    45.320
amax           46.160    46.158    46.167
emean           0.152     0.152     0.152
emin            0.139     0.139     0.139
emax            0.167     0.167     0.167
imean           8.767     8.767     8.767
imin            8.335     8.335     8.334
imax            9.412     9.409     9.412
excite_mean     0.215     0.215     0.215
fracstop        1.000     1.000     1.000
cjmean          3.066     3.066     3.066

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       183.8     183.9     183.8
kozaiamp        179.9     180.0     180.0