Orbit Fit and Astrometric record for 15VL167

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: 15VL167   
# Created Wed Feb 20 02:10:39 2019
# Orbit generated from Bernstein formalism
# Fitting   20 observations of   20
# Arc:   1.46y
# First observation: 2015/08/11
#  Last observation: 2017/01/26
Preliminary a, adot, b, bdot, g, gdot:
  -0.000086   0.038735   0.000010   0.007214   0.032752   0.000000
# Chi-squared of fit:     4.08 DOF:   34 RMS:  0.08
# Min/Max residuals:    -0.30    0.15
# Exact a, adot, b, bdot, g, gdot:
  1.873965E-05  3.765667E-02  3.228321E-06  7.056243E-03  3.192596E-02 -2.141403E-04
# Covariance matrix:
  4.1337E-13  5.7211E-13 -3.0623E-14  2.2770E-13  7.5707E-13  2.1864E-11
  5.7211E-13  2.3570E-12 -9.8385E-14  7.2564E-13  2.2332E-12  6.9593E-11
 -3.0623E-14 -9.8385E-14  1.7247E-13 -1.8102E-13 -9.8779E-14 -3.5909E-12
  2.2770E-13  7.2564E-13 -1.8102E-13  4.8461E-13  7.3159E-13  2.6150E-11
  7.5707E-13  2.2332E-12 -9.8779E-14  7.3159E-13  2.3447E-12  7.0208E-11
  2.1864E-11  6.9593E-11 -3.5909E-12  2.6150E-11  7.0208E-11  2.5031E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.404812   49.509915    1.015745    0.000244    0.016888  2457246.106449
# Heliocentric elements and errors
Epoch:              2457240.5000  =  2015/08/06
Mean Anomaly:          346.77351 +/-     0.408
Argument of Peri:       15.64129 +/-     0.560
Long of Asc Node:       49.81431 +/-     0.000
Inclination:            10.62417 +/-     0.001
Eccentricity:         0.14607232 +/-    0.0004
Semi-Major Axis:     36.45210731 +/-    0.0059
Time of Perihelion: 2460193.9140 +/-      91.2
Perihelion:          31.12746349 +/-    0.0164
Aphelion:            41.77675112 +/-    0.0170
Period (y)              220.0859 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           21.09525006 +/-    0.0010
Ecliptic Y           23.14825981 +/-    0.0011
Ecliptic Z           -0.22116996 +/-    0.0000
Ecliptic XDOT        -0.00246714 +/-    0.0000
Ecliptic YDOT         0.00207977 +/-    0.0000
Ecliptic ZDOT         0.00060529 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   31.31932987 +/-    0.0011
Geocenter to KBO     31.32247707 +/-    0.0015
# Hcoef:  9.71

The following table shows the complete astrometric record for 15VL167. 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 (15VL167) followed by the observatory code and reference code for the source of the astrometry.

2015 08  11.60566  03 08 41.881  +17 13 08.88  25.0w 15VL167   568  C~2lVi      
2015 09  06.63576  03 08 36.479  +17 14 15.45  24.6w 15VL167   568  C~2lVi      
2015 09  12.52541  03 08 23.620  +17 13 44.36  24.9w 15VL167   568  C~2lVi      
2015 10  07.46582  03 06 47.202  +17 08 45.93  24.5w 15VL167   568  C~2lVi      
2015 10  08.47003  03 06 42.082  +17 08 29.04  24.7w 15VL167   568  C~2lVi      
2015 10  08.52822  03 06 41.781  +17 08 28.13  24.7w 15VL167   568  C~2lVi      
2015 11  06.28626  03 03 49.937  +16 58 40.13  24.9r 15VL167   568  C~2lVi      
2015 11  06.34963  03 03 49.536  +16 58 38.84  24.5r 15VL167   568  C~2lVi      
2015 11  06.42017  03 03 49.076  +16 58 36.95  24.5r 15VL167   568  C~2lVi      
2015 11  06.48956  03 03 48.617  +16 58 35.76  24.3r 15VL167   568  C~2lVi      
2015 11  07.50772  03 03 41.980  +16 58 12.66  24.4w 15VL167   568  C~2lVi      
2016 09  06.61138  03 16 59.148  +18 12 45.01  24.9w 15VL167   568  C~2lVi      
2016 10  27.50259  03 13 18.998  +18 02 12.14  24.8w 15VL167   568  C~2lVi      
2016 11  02.60863  03 12 40.061  +18 00 06.16  24.8w 15VL167   568  C~2lVi      
2016 11  03.52763  03 12 34.111  +17 59 46.72  24.6w 15VL167   568  C~2lVi      
2016 12  28.38756  03 07 14.393  +17 42 21.68  24.9w 15VL167   568  C~2lVi      
2016 12  29.35312  03 07 10.617  +17 42 10.13  24.7w 15VL167   568  C~2lVi      
2017 01  01.25010  03 06 59.916  +17 41 38.37  25.2w 15VL167   568  C~2lVi      
2017 01  02.36014  03 06 56.040  +17 41 27.06  25.0w 15VL167   568  C~2lVi      
2017 01  26.27742  03 06 09.360  +17 39 50.45  24.2w 15VL167   568  C~2lVi      

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     0.05
  2   0.0713    -56.51    -0.02      85.02     0.01
  3   0.0874   -242.27     0.02     104.95     0.05
  4   0.1557  -1653.09     0.05     193.27    -0.03
  5   0.1584  -1728.31    -0.05     197.04     0.02
  6   0.1586  -1732.71     0.04     197.35     0.08
  7   0.2373  -4264.25    -0.22     308.80    -0.03
  8   0.2375  -4270.13     0.04     309.15     0.02
  9   0.2377  -4277.00     0.04     309.16    -0.30
 10   0.2379  -4283.66     0.15     309.83     0.07
 11   0.2407  -4381.60    -0.04     313.96     0.05
 12   1.0733   7802.91     0.05    1564.93     0.04
 13   1.2126   4605.33    -0.03    1776.69    -0.13
 14   1.2293   4036.12    -0.00    1802.31     0.04
 15   1.2318   3949.09    -0.05    1806.09    -0.01
 16   1.3820   -729.34    -0.01    2026.77     0.08
 17   1.3847   -784.41    -0.07    2030.35    -0.04
 18   1.3926   -940.20     0.11    2041.45     0.02
 19   1.3956   -996.58     0.06    2045.67    -0.03
 20   1.4611  -1664.81    -0.05    2134.97     0.05

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.

15VL167    quality flag:3

Type:           4:3E      4:3E      4:3E

axisobj        36.798    36.817    36.779
ecceobj         0.152     0.152     0.152
incobj         10.592    10.592    10.592
qmin           30.688    30.732    30.663
qmax           42.648    42.625    42.571
amean          36.477    36.477    36.477
amin           36.164    36.148    36.162
amax           36.838    36.850    36.819
emean           0.139     0.138     0.139
emin            0.111     0.111     0.113
emax            0.158     0.158     0.158
imean           8.198     7.902     8.331
imin            6.342     6.024     6.528
imax           10.441    10.425    10.444
excite_mean     0.200     0.196     0.201
fracstop        1.000     1.000     1.000
cjmean          2.983     2.984     2.982

libcent 0       180.5     180.7     179.1
libamp  0        47.3      54.7      37.4
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       177.5     177.5     176.7
kozaiamp        180.0     180.0     179.9