Orbit Fit and Astrometric record for 15BS518

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: 15BS518   
# Created Tue Jul 17 01:38:18 2018
# Orbit generated from Bernstein formalism
# Fitting   16 observations of   17
# Arc:   3.20y
# First observation: 2015/01/28
#  Last observation: 2018/04/10
Preliminary a, adot, b, bdot, g, gdot:
   0.000011   0.024908   0.000003  -0.012133   0.026460   0.000000
# Chi-squared of fit:     5.80 DOF:   26 RMS:  0.11
# Min/Max residuals:    -0.24    0.25
# Exact a, adot, b, bdot, g, gdot:
  1.511573E-05  2.460222E-02 -7.674853E-06 -1.196927E-02  2.622630E-02 -1.909655E-03
# Covariance matrix:
  2.5495E-13  6.2902E-13  6.9004E-15 -4.0684E-13  5.1902E-13  1.0626E-11
  6.2902E-13  8.5999E-11  3.3931E-12 -6.0868E-11  2.1126E-11  1.5904E-09
  6.9004E-15  3.3931E-12  2.4570E-13 -2.4522E-12  7.8522E-13  6.3050E-11
 -4.0684E-13 -6.0868E-11 -2.4522E-12  4.3237E-11 -1.4799E-11 -1.1275E-09
  5.1902E-13  2.1126E-11  7.8522E-13 -1.4799E-11  6.0885E-12  3.8666E-10
  1.0626E-11  1.5904E-09  6.3050E-11 -1.1275E-09  3.8666E-10  2.9460E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   12.995704  173.842668    0.705676    0.153873   -0.666039  2457051.012878
# Heliocentric elements and errors
Epoch:              2457050.5000  =  2015/01/28
Mean Anomaly:          318.39416 +/-     1.706
Argument of Peri:      203.72103 +/-     2.409
Long of Asc Node:       17.41936 +/-     0.001
Inclination:            28.51549 +/-     0.001
Eccentricity:         0.11432901 +/-    0.0047
Semi-Major Axis:     42.13056727 +/-    0.0193
Time of Perihelion: 2468594.2309 +/-     473.2
Perihelion:          37.31382134 +/-    0.1995
Aphelion:            46.94731321 +/-    0.2000
Period (y)              273.4665 +/-      0.19
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.54574437 +/-    0.0035
Ecliptic Y            4.76006582 +/-    0.0004
Ecliptic Z            8.57422363 +/-    0.0008
Ecliptic XDOT        -0.00036551 +/-    0.0000
Ecliptic YDOT        -0.00254961 +/-    0.0000
Ecliptic ZDOT        -0.00126224 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.80539212 +/-    0.0034
Geocenter to KBO     38.12966974 +/-    0.0036
# Hcoef:  6.45

The following table shows the complete astrometric record for 15BS518. 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 (15BS518) followed by the observatory code and reference code for the source of the astrometry.

2015 01  28.51210  11 58 28.642  +14 21 10.51  22.6w 15BS518   F51  C~1vYB      
2015 01  28.52384  11 58 28.604  +14 21 10.90  22.6w 15BS518   F51  C~1vYB      
2015 01  28.53552  11 58 28.572  +14 21 11.10  22.5w 15BS518   F51  C~1vYB      
2015 02  16.40991  11 57 18.593  +14 30 46.76  22.2w 15BS518   F51  C~1vYB      
2015 02  16.42133  11 57 18.537  +14 30 47.41  22.4w 15BS518   F51  C~1vYB      
2015 02  16.43280  11 57 18.478  +14 30 47.63  22.4w 15BS518   F51  C~1vYB      
2015 02  16.44425  11 57 18.452  +14 30 47.70  22.4w 15BS518   F51  C~1vYB      
2015 02  18.43530  11 57 09.653  +14 31 50.58  22.4w 15BS518   F51  C~1vYB      
2015 02  18.44608  11 57 09.624  +14 31 50.96  22.4w 15BS518   F51  C~1vYB      
2015 02  18.45717  11 57 09.563  +14 31 51.20  22.4w 15BS518   F51  C~1vYB      
2015 02  18.46794  11 57 09.511  +14 31 51.36  22.5w 15BS518   F51  C~1vYB      
2015 03  25.49867  11 54 13.047  +14 48 16.21  22.4w 15BS518   F51  C~1vYB      
2015 03  25.51012  11 54 12.977  +14 48 16.16  22.3w 15BS518   F51  C~1vYB      
2015 03  25.52157  11 54 12.919  +14 48 16.58  22.4w 15BS518   F51  C~1vYB      
2015 03  25.53304  11 54 12.868  +14 48 16.88  22.3w 15BS518   F51  C~1vYB      
2018 04  10.17713  12 05 26.217  +11 13 56.30  22.0R 15BS518   G37              
2018 04  10.22933  12 05 25.968  +11 13 57.40        15BS518   G37              

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    -0.06       0.00     0.09
  2   0.0000     -0.66    -0.10       0.13     0.13
  3   0.0001     -1.17     0.01       0.12     0.03
  4   0.0517  -1164.11     0.25     111.39    -0.13
  5   0.0518  -1165.11     0.06     111.65     0.10
  6   0.0518  -1165.98     0.01     111.50    -0.08
  7   0.0518  -1166.36 (   0.46)    111.41 (  -0.20)
  8   0.0573  -1308.66    -0.17     116.85    -0.05
  9   0.0573  -1309.20     0.08     117.03     0.10
 10   0.0573  -1310.11    -0.02     116.89    -0.06
 11   0.0574  -1310.86     0.01     116.72    -0.24
 12   0.1533  -4051.45    -0.03     -21.21     0.16
 13   0.1533  -4052.36    -0.03     -21.67    -0.17
 14   0.1533  -4053.30    -0.06     -21.62     0.00
 15   0.1534  -4054.10     0.05     -21.65     0.10
 16   3.1969  10201.53    -0.03   -7736.59    -0.13
 17   3.1970  10197.73     0.03   -7737.10     0.13

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.

15BS518    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        41.814    41.847    41.793
ecceobj         0.109     0.099     0.113
incobj         28.605    28.604    28.605
qmin           36.218    36.659    36.131
qmax           47.979    47.589    48.024
amean          41.981    41.975    41.920
amin           41.635    41.637    41.579
amax           42.347    42.347    42.281
emean           0.117     0.106     0.119
emin            0.100     0.089     0.103
emax            0.134     0.124     0.136
imean          28.336    28.342    28.346
imin           27.977    28.020    27.976
imax           28.731    28.739    28.744
excite_mean     0.489     0.486     0.490
fracstop        1.000     1.000     1.000
cjmean          2.781     2.783     2.780

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       182.5     181.2     182.1
kozaiamp        180.0     180.0     180.0