Orbit Fit and Astrometric record for 15VA168

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: 15VA168   
# Created Tue Apr 23 01:10:48 2019
# Orbit generated from Bernstein formalism
# Fitting   29 observations of   29
# Arc:   2.09y
# First observation: 2015/08/20
#  Last observation: 2017/09/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.000150   0.038839   0.000007   0.003784   0.029530   0.000000
# Chi-squared of fit:     5.95 DOF:   52 RMS:  0.08
# Min/Max residuals:    -0.21    0.38
# Exact a, adot, b, bdot, g, gdot:
  2.060384E-05  3.833399E-02  2.036886E-06  3.747795E-03  2.924602E-02  4.475713E-03
# Covariance matrix:
  2.0125E-13 -1.4539E-14 -3.0665E-16  7.5574E-15  1.4312E-13  1.1377E-12
 -1.4539E-14  7.1984E-13 -1.2609E-14  7.0488E-14  3.1011E-13  1.0324E-11
 -3.0665E-16 -1.2609E-14  9.4052E-14 -8.0405E-14 -5.5503E-15 -2.2416E-13
  7.5574E-15  7.0488E-14 -8.0405E-14  1.4751E-13  3.7361E-14  1.2528E-12
  1.4312E-13  3.1011E-13 -5.5503E-15  3.7361E-14  2.8345E-13  5.5055E-12
  1.1377E-12  1.0324E-11 -2.2416E-13  1.2528E-12  5.5055E-12  1.8349E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.898441   54.214058    1.013288   -0.000679   -0.051625  2457255.045359
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:            3.70868 +/-     0.014
Argument of Peri:      336.73000 +/-     0.055
Long of Asc Node:       61.68325 +/-     0.001
Inclination:             5.61528 +/-     0.001
Eccentricity:         0.52801097 +/-    0.0002
Semi-Major Axis:     71.82729148 +/-    0.0195
Time of Perihelion: 2454959.8957 +/-       8.6
Perihelion:          33.90169393 +/-    0.0151
Aphelion:           109.75288903 +/-    0.0320
Period (y)              608.7549 +/-      0.25
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           20.84007673 +/-    0.0004
Ecliptic Y           27.18319367 +/-    0.0005
Ecliptic Z           -0.53605114 +/-    0.0000
Ecliptic XDOT        -0.00266491 +/-    0.0000
Ecliptic YDOT         0.00243641 +/-    0.0000
Ecliptic ZDOT         0.00034429 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   34.25670981 +/-    0.0005
Geocenter to KBO     34.19268469 +/-    0.0006
# Hcoef:  8.35

The following table shows the complete astrometric record for 15VA168. 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 (15VA168) followed by the observatory code and reference code for the source of the astrometry.

2015 08  20.54457  03 28 18.234  +17 57 14.51  23.6w 15VA168   568  C~2lVl      
2015 08  20.55007  03 28 18.230  +17 57 14.51  23.7w 15VA168   568  C~2lVl      
2015 09  07.60044  03 28 17.924  +17 57 23.81  24.1w 15VA168   568  C~2lVl      
2015 09  12.44733  03 28 11.461  +17 57 03.59  23.9w 15VA168   568  C~2lVl      
2015 10  07.49766  03 26 58.512  +17 53 02.80  23.9w 15VA168   568  C~2lVl      
2015 10  07.55607  03 26 58.267  +17 53 01.99  23.7w 15VA168   568  C~2lVl      
2015 10  09.53675  03 26 49.993  +17 52 34.34  23.8w 15VA168   568  C~2lVl      
2015 11  06.31257  03 24 27.855  +17 44 37.93  23.6r 15VA168   568  C~2lVl      
2015 11  06.37589  03 24 27.494  +17 44 36.80  23.7r 15VA168   568  C~2lVl      
2015 11  06.44667  03 24 27.067  +17 44 35.85  23.7r 15VA168   568  C~2lVl      
2015 11  07.46686  03 24 21.224  +17 44 15.92  23.5w 15VA168   568  C~2lVl      
2015 11  17.44798  03 23 23.270  +17 41 03.21  23.5w 15VA168   568  C~2lVl      
2015 11  17.49527  03 23 22.984  +17 41 02.29  23.8w 15VA168   568  C~2lVl      
2015 12  06.31417  03 21 36.706  +17 35 14.49  23.7w 15VA168   568  C~2lVl      
2015 12  06.44064  03 21 36.006  +17 35 12.13  23.9w 15VA168   568  C~2lVl      
2015 12  06.44787  03 21 35.983  +17 35 12.07  23.9w 15VA168   568  C~2lVl      
2015 12  31.33561  03 19 43.545  +17 29 26.52  23.6w 15VA168   568  C~2lVl      
2016 01  07.36493  03 19 21.300  +17 28 26.40  23.7w 15VA168   568  C~2lVl      
2016 01  07.41708  03 19 21.151  +17 28 25.98  23.9w 15VA168   568  C~2lVl      
2016 02  05.31154  03 18 47.701  +17 28 03.68  24.0w 15VA168   568  C~2lVl      
2016 02  11.26421  03 18 53.275  +17 28 46.71  23.9w 15VA168   568  C~2lVl      
2016 10  28.47058  03 34 09.862  +18 32 36.66        15VA168   568  C~2lVl      
2016 10  28.49380  03 34 09.737  +18 32 36.29        15VA168   568  C~2lVl      
2016 10  29.53251  03 34 04.103  +18 32 18.65        15VA168   568  C~2lVl      
2016 11  02.58549  03 33 41.701  +18 31 08.56        15VA168   568  C~2lVl      
2016 12  24.36175  03 28 59.651  +18 16 42.35  23.9w 15VA168   568  C~2lVl      
2017 01  27.31949  03 27 31.475  +18 13 12.08  23.7w 15VA168   568  C~2lVl      
2017 09  15.62735  03 45 44.131  +19 23 23.00  23.9w 15VA168   568  C~2lVl      
2017 09  22.60498  03 45 30.523  +19 22 49.54  24.0w 15VA168   568  C~2lVl      

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     0.03       0.00    -0.00
  2   0.0000     -0.06    -0.11       0.01     0.01
  3   0.0494     -2.02    -0.05      10.10     0.02
  4   0.0627    -96.38     0.15      13.05    -0.11
  5   0.1313  -1164.81     0.00      35.18     0.00
  6   0.1314  -1168.40     0.00      35.26    -0.01
  7   0.1369  -1289.69    -0.05      37.55     0.03
  8   0.2129  -3374.61     0.03      79.35    -0.09
  9   0.2131  -3379.88     0.13      79.55    -0.06
 10   0.2133  -3386.03     0.03      80.15     0.38
 11   0.2161  -3471.86     0.04      81.68    -0.05
 12   0.2434  -4322.15    -0.05     102.35     0.02
 13   0.2435  -4326.34    -0.12     102.48     0.04
 14   0.2951  -5885.17    -0.00     148.80     0.02
 15   0.2954  -5895.45    -0.21     149.05    -0.12
 16   0.2954  -5895.79     0.03     149.08    -0.12
 17   0.3636  -7540.71    -0.06     223.99    -0.00
 18   0.3828  -7864.21     0.10     247.30    -0.00
 19   0.3830  -7866.39     0.11     247.44    -0.04
 20   0.4621  -8335.44     0.01     348.68     0.10
 21   0.4784  -8247.17    -0.01     369.81     0.03
 22   1.1908   5373.84    -0.02     854.54     0.01
 23   1.1908   5372.02     0.03     854.61     0.02
 24   1.1937   5289.94     0.02     856.44    -0.01
 25   1.2048   4963.60     0.02     863.88    -0.03
 26   1.3465    857.63     0.02     988.43    -0.01
 27   1.4395   -411.78    -0.05    1091.75    -0.04
 28   2.0728  15687.26     0.00    1568.85     0.02
 29   2.0919  15490.96    -0.01    1578.74     0.00

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.

15VA168    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        73.425    73.519    73.332
ecceobj         0.538     0.539     0.538
incobj          5.604     5.604     5.604
qmin           32.956    33.071    33.247
qmax          119.278   144.596   118.232
amean          71.114    78.831    72.479
amin           65.724    70.601    69.041
amax           76.491    89.228    76.104
emean           0.525     0.568     0.530
emin            0.487     0.516     0.505
emax            0.559     0.621     0.554
imean           3.575     4.423     4.179
imin            2.659     3.634     3.361
imax            4.689     5.249     4.757
excite_mean     0.529     0.573     0.535
fracstop        1.000     1.000     1.000
cjmean          3.033     3.034     3.039

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       167.5     173.0     155.7
kozaiamp        180.0     180.0     180.0