Orbit Fit and Astrometric record for 15VA170

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: 15VA170   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting     27 observations of     27
# Arc:   1.44y
# First observation: 2015/08/20
#  Last observation: 2017/01/27
Preliminary a, adot, b, bdot, g, gdot:
  -0.000140   0.023216  -0.000005  -0.000088   0.023729   0.000000
# Chi-squared of fit:     8.81 DOF:     48 RMS:  0.10
# Min/Max residuals:    -0.27    0.40
# Exact a, adot, b, bdot, g, gdot:
  1.543605E-05  2.281951E-02 -1.231312E-07 -8.835183E-05  2.350701E-02  1.535949E-03
# Covariance matrix:
  3.7183E-13  1.1026E-13  8.1358E-15 -1.0256E-14  4.1849E-13  1.8642E-11
  1.1026E-13  6.8746E-13  1.0919E-14 -1.8893E-14  5.5573E-13  3.4319E-11
  8.1358E-15  1.0919E-14  1.3494E-13 -1.3891E-13  1.5806E-14  8.2284E-13
 -1.0256E-14 -1.8893E-14 -1.3891E-13  2.3512E-13 -2.3043E-14 -1.4311E-12
  4.1849E-13  5.5573E-13  1.5806E-14 -2.3043E-14  8.0940E-13  4.1870E-11
  1.8642E-11  3.4319E-11  8.2284E-13 -1.4311E-12  4.1870E-11  2.5996E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.619348   54.291104    1.013343   -0.001294   -0.050443  2457255.056669
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:           62.13681 +/-     0.816
Argument of Peri:      193.87629 +/-     1.054
Long of Asc Node:      152.16688 +/-     0.042
Inclination:             1.63827 +/-     0.000
Eccentricity:         0.04558940 +/-    0.0021
Semi-Major Axis:     43.45294584 +/-    0.0101
Time of Perihelion: 2439192.3311 +/-     237.1
Perihelion:          41.47195216 +/-    0.0923
Aphelion:            45.43393951 +/-    0.0924
Period (y)              286.4422 +/-      0.10
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           25.66778691 +/-    0.0010
Ecliptic Y           33.97817001 +/-    0.0013
Ecliptic Z           -1.20214187 +/-    0.0000
Ecliptic XDOT        -0.00205589 +/-    0.0000
Ecliptic YDOT         0.00168985 +/-    0.0000
Ecliptic ZDOT        -0.00001529 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.60042802 +/-    0.0012
Geocenter to KBO     42.54049716 +/-    0.0016
# Hcoef:  8.50

The following table shows the complete astrometric record for 15VA170. 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 (15VA170) followed by the observatory code and reference code for the source of the astrometry.

2015 08  20.55588  03 29 21.305  +17 16 25.18  24.8w 15VA170   568  C~2nw4      
2015 09  07.60452  03 29 16.482  +17 15 24.39  25.0w 15VA170   568  C~2nw4      
2015 09  12.45550  03 29 10.054  +17 14 49.94  25.1w 15VA170   568  C~2nw4      
2015 10  09.54258  03 27 57.970  +17 09 36.79  25.1w 15VA170   568  C~2nw4      
2015 11  06.31779  03 25 57.146  +17 01 47.21  24.4r 15VA170   568  C~2nw4      
2015 11  06.38117  03 25 56.832  +17 01 46.04  24.7r 15VA170   568  C~2nw4      
2015 11  06.45191  03 25 56.476  +17 01 45.22  25.0r 15VA170   568  C~2nw4      
2015 11  06.46851  03 25 56.386  +17 01 44.55  24.7r 15VA170   568  C~2nw4      
2015 11  07.47269  03 25 51.531  +17 01 26.21  24.8w 15VA170   568  C~2nw4      
2015 11  17.45383  03 25 02.538  +16 58 24.05  24.9w 15VA170   568  C~2nw4      
2015 11  17.54213  03 25 02.092  +16 58 22.41  24.6w 15VA170   568  C~2nw4      
2015 12  06.32006  03 23 32.063  +16 52 57.34  25.2w 15VA170   568  C~2nw4      
2015 12  06.45375  03 23 31.424  +16 52 55.00  25.1w 15VA170   568  C~2nw4      
2015 12  31.34139  03 21 53.978  +16 47 24.33  24.7w 15VA170   568  C~2nw4      
2016 01  07.37071  03 21 33.939  +16 46 22.40  24.9w 15VA170   568  C~2nw4      
2016 02  05.31732  03 20 57.583  +16 45 10.23  25.1w 15VA170   568  C~2nw4      
2016 02  11.27002  03 21 00.104  +16 45 33.84  25.1w 15VA170   568  C~2nw4      
2016 09  07.60255  03 34 36.682  +17 33 56.02  25.1w 15VA170   568  C~2nw4      
2016 09  27.53124  03 33 58.031  +17 30 58.25  25.5w 15VA170   568  C~2nw4      
2016 10  07.52165  03 33 26.557  +17 28 50.30  25.8w 15VA170   568  C~2nw4      
2016 10  07.61708  03 33 26.206  +17 28 48.90  24.5w 15VA170   568  C~2nw4      
2016 10  09.52198  03 33 19.414  +17 28 22.15        15VA170   568  C~2nw4      
2016 10  09.59415  03 33 19.139  +17 28 21.09  25.3w 15VA170   568  C~2nw4      
2016 11  02.47368  03 31 37.185  +17 21 55.00  24.9w 15VA170   568  C~2nw4      
2016 11  04.44969  03 31 27.750  +17 21 20.32  24.8w 15VA170   568  C~2nw4      
2016 12  24.35704  03 27 37.787  +17 08 02.31  25.4w 15VA170   568  C~2nw4      
2017 01  27.32464  03 26 18.778  +17 04 22.87  24.8w 15VA170   568  C~2nw4      

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    -0.02       0.00     0.01
     2   0.0494    -81.79     0.01     -42.16    -0.01
     3   0.0627   -179.49     0.01     -53.18    -0.15
     4   0.1369  -1257.59     0.06    -104.70    -0.14
     5   0.2129  -3052.37     0.09    -133.47    -0.06
     6   0.2131  -3057.02     0.04    -133.49    -0.08
     7   0.2133  -3062.17     0.05    -133.03     0.40
     8   0.2133  -3063.59    -0.16    -133.36     0.07
     9   0.2161  -3135.61     0.01    -133.90    -0.01
    10   0.2434  -3861.83     0.01    -136.08     0.02
    11   0.2436  -3868.44    -0.05    -136.07     0.01
    12   0.2950  -5201.26     0.04    -128.62     0.01
    13   0.2954  -5210.73    -0.27    -128.59    -0.10
    14   0.3635  -6649.16    -0.00     -96.96    -0.06
    15   0.3828  -6943.58     0.17     -84.19     0.10
    16   0.4620  -7467.64     0.08     -21.79     0.15
    17   0.4783  -7426.58    -0.06      -8.12    -0.03
    18   1.0515   4634.75    -0.05     -62.28     0.06
    19   1.1060   4055.31     0.07    -104.05    -0.12
    20   1.1334   3587.38     0.07    -121.34    -0.13
    21   1.1336   3582.17    -0.06    -121.50    -0.16
    22   1.1389   3481.39     0.10    -124.35    -0.04
    23   1.1391   3477.31     0.01    -124.44    -0.03
    24   1.2044   1967.87    -0.08    -150.28     0.06
    25   1.2098   1828.41    -0.04    -151.47     0.01
    26   1.3465  -1561.22    -0.08    -125.40     0.12
    27   1.4395  -2713.24     0.06     -59.31     0.09

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.

15VA170    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.879    43.921    43.839
ecceobj         0.054     0.059     0.049
incobj          1.636     1.636     1.636
qmin           40.414    40.200    40.590
qmax           46.867    47.177    46.634
amean          43.539    43.580    43.501
amin           43.203    43.240    43.166
amax           43.894    43.933    43.852
emean           0.052     0.058     0.047
emin            0.033     0.038     0.028
emax            0.068     0.074     0.063
imean           2.157     2.171     2.144
imin            1.213     1.213     1.213
imax            2.877     2.891     2.859
excite_mean     0.064     0.069     0.060
fracstop        1.000     1.000     1.000
cjmean          3.091     3.091     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       182.2     182.0     182.6
kozaiamp        180.0     180.0     179.9