Orbit Fit and Astrometric record for 15VA166

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: 15VA166   
# Created Thu Feb 21 02:10:24 2019
# Orbit generated from Bernstein formalism
# Fitting   27 observations of   27
# Arc:   2.09y
# First observation: 2015/08/20
#  Last observation: 2017/09/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.000214   0.030884   0.000057   0.007221   0.028547   0.000000
# Chi-squared of fit:     4.94 DOF:   48 RMS:  0.08
# Min/Max residuals:    -0.18    0.22
# Exact a, adot, b, bdot, g, gdot:
  1.671867E-05  3.093373E-02  4.369063E-06  7.300552E-03  2.855061E-02  1.232924E-02
# Covariance matrix:
  2.3066E-13 -5.2341E-14 -4.1403E-15  1.4873E-14  1.5737E-13  1.0127E-12
 -5.2341E-14  7.2136E-13 -4.1375E-14  1.8064E-13  2.9845E-13  1.1980E-11
 -4.1403E-15 -4.1375E-14  1.0622E-13 -8.6767E-14 -2.3284E-14 -8.2354E-13
  1.4873E-14  1.8064E-13 -8.6767E-14  1.6444E-13  9.7942E-14  3.5808E-12
  1.5737E-13  2.9845E-13 -2.3284E-14  9.7942E-14  3.1573E-13  6.5260E-12
  1.0127E-12  1.1980E-11 -8.2354E-13  3.5808E-12  6.5260E-12  2.3760E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.352506   54.656062    1.013661    0.000400   -0.043739  2457255.041279
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:           32.21043 +/-     0.028
Argument of Peri:      288.72314 +/-     0.018
Long of Asc Node:       51.49935 +/-     0.000
Inclination:            13.16493 +/-     0.001
Eccentricity:         0.41630432 +/-    0.0005
Semi-Major Axis:     47.65298617 +/-    0.0263
Time of Perihelion: 2446500.0246 +/-       2.6
Perihelion:          27.81484206 +/-    0.0293
Aphelion:            67.49113028 +/-    0.0449
Period (y)              328.9602 +/-      0.27
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           21.10942237 +/-    0.0004
Ecliptic Y           28.01869237 +/-    0.0006
Ecliptic Z            0.21566727 +/-    0.0000
Ecliptic XDOT        -0.00174021 +/-    0.0000
Ecliptic YDOT         0.00267050 +/-    0.0000
Ecliptic ZDOT         0.00070740 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.08135327 +/-    0.0005
Geocenter to KBO     35.02552743 +/-    0.0007
# Hcoef:  8.96

The following table shows the complete astrometric record for 15VA166. 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 (15VA166) followed by the observatory code and reference code for the source of the astrometry.

2015 08  20.54049  03 28 49.440  +19 16 30.11  24.6w 15VA166   568  C~2lVd      
2015 09  07.59637  03 28 44.196  +19 17 40.33  24.4w 15VA166   568  C~2lVd      
2015 09  12.44325  03 28 36.477  +19 17 36.53  24.3w 15VA166   568  C~2lVd      
2015 10  07.49180  03 27 17.777  +19 14 57.54  24.4w 15VA166   568  C~2lVd      
2015 10  07.55020  03 27 17.508  +19 14 57.01  24.7w 15VA166   568  C~2lVd      
2015 10  09.53094  03 27 08.824  +19 14 35.27  24.6w 15VA166   568  C~2lVd      
2015 11  06.30734  03 24 41.273  +19 07 50.20  24.4r 15VA166   568  C~2lVd      
2015 11  06.37060  03 24 40.874  +19 07 49.14  24.4r 15VA166   568  C~2lVd      
2015 11  06.44142  03 24 40.455  +19 07 48.14  24.1r 15VA166   568  C~2lVd      
2015 11  07.46098  03 24 34.415  +19 07 30.59  24.4w 15VA166   568  C~2lVd      
2015 11  17.44217  03 23 34.652  +19 04 35.59  24.3w 15VA166   568  C~2lVd      
2015 11  17.48946  03 23 34.367  +19 04 34.89  24.4w 15VA166   568  C~2lVd      
2015 12  06.30809  03 21 44.639  +18 59 07.90  24.3w 15VA166   568  C~2lVd      
2015 12  06.43481  03 21 43.939  +18 59 05.65  24.7w 15VA166   568  C~2lVd      
2015 12  31.32982  03 19 46.516  +18 53 21.53  24.8w 15VA166   568  C~2lVd      
2016 01  07.35914  03 19 22.707  +18 52 17.11  24.1w 15VA166   568  C~2lVd      
2016 02  05.30505  03 18 41.808  +18 51 19.61  25.1w 15VA166   568  C~2lVd      
2016 02  11.25843  03 18 45.680  +18 51 53.39  24.3w 15VA166   568  C~2lVd      
2016 09  25.62935  03 34 54.735  +20 06 37.21  24.7w 15VA166   568  C~2lVd      
2016 10  10.61736  03 33 57.228  +20 04 39.52  24.7w 15VA166   568  C~2lVd      
2016 11  02.46775  03 31 58.391  +19 59 41.28  24.6w 15VA166   568  C~2lVd      
2016 11  04.44390  03 31 46.944  +19 59 10.57  24.3w 15VA166   568  C~2lVd      
2017 01  27.32921  03 25 34.663  +19 41 55.22  24.8w 15VA166   568  C~2lVd      
2017 09  15.63753  03 42 08.442  +20 54 47.02        15VA166   568  C~2lVd      
2017 09  16.58439  03 42 06.596  +20 54 46.70  24.5w 15VA166   568  C~2lVd      
2017 09  17.58740  03 42 04.521  +20 54 45.89  24.9w 15VA166   568  C~2lVd      
2017 09  22.61102  03 41 52.540  +20 54 37.05  24.5w 15VA166   568  C~2lVd      

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     0.09       0.00    -0.07
  2   0.0494    -54.88    -0.05      86.20     0.04
  3   0.0627   -161.79    -0.18     109.18    -0.08
  4   0.1313  -1281.15     0.07     228.04    -0.08
  5   0.1314  -1284.97    -0.07     228.47     0.05
  6   0.1369  -1409.53    -0.02     237.65    -0.02
  7   0.2129  -3535.35     0.22     363.27    -0.14
  8   0.2131  -3541.10    -0.06     363.65    -0.07
  9   0.2133  -3547.10     0.08     364.17     0.10
 10   0.2161  -3634.39    -0.02     368.54     0.02
 11   0.2434  -4498.66    -0.02     411.23    -0.02
 12   0.2435  -4502.75     0.07     411.56     0.11
 13   0.2951  -6091.93    -0.02     487.83     0.13
 14   0.2954  -6102.11     0.12     488.17    -0.06
 15   0.3636  -7802.75     0.00     580.27    -0.03
 16   0.3828  -8146.40    -0.10     604.74     0.11
 17   0.4621  -8723.16    -0.13     698.65     0.02
 18   0.4784  -8661.24     0.02     717.14     0.03
 19   1.1009   5730.47     0.08    1684.72     0.06
 20   1.1419   4914.90    -0.10    1761.28    -0.00
 21   1.2045   3216.63    -0.02    1869.85    -0.02
 22   1.2099   3052.57    -0.02    1878.66    -0.02
 23   1.4395  -2294.53     0.06    2156.09    -0.02
 24   2.0728  12338.52    -0.00    3100.60     0.04
 25   2.0754  12313.15     0.02    3106.10     0.03
 26   2.0782  12284.54    -0.07    3111.83    -0.08
 27   2.0919  12118.38     0.06    3140.90    -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.

15VA166    quality flag:3

Type:           2:1E      2:1E      2:1E

axisobj        48.400    48.481    48.319
ecceobj         0.425     0.426     0.424
incobj         13.127    13.127    13.128
qmin           27.204    27.218    27.228
qmax           69.411    69.468    69.218
amean          47.796    47.796    47.796
amin           47.315    47.258    47.252
amax           48.547    48.547    48.485
emean           0.390     0.377     0.389
emin            0.332     0.305     0.331
emax            0.430     0.431     0.430
imean          15.207    16.338    15.201
imin           11.907    11.946    11.903
imax           19.633    21.199    19.626
excite_mean     0.473     0.474     0.472
fracstop        1.000     1.000     1.000
cjmean          2.865     2.865     2.866

libcent 0        65.9      69.3      66.2
libamp  0         9.8      23.9      11.1
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       241.4     205.3     241.5
kozaiamp        180.0     180.0     180.0