Orbit Fit and Astrometric record for 15BQ518

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: 15BQ518   
# Created Fri Nov 16 02:09:58 2018
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   17 observations of   17
# Arc:   6.22y
# First observation: 2012/01/20
#  Last observation: 2018/04/10
# Chi-squared of fit:    17.23 DOF:   28 RMS:  0.18
# Min/Max residuals:    -0.57    0.49
# Exact a, adot, b, bdot, g, gdot:
  1.505404E-05  2.288264E-02 -1.847071E-06 -2.824149E-03  2.411069E-02  1.463496E-03
# Covariance matrix:
  3.3597E-13 -1.7153E-13 -3.4260E-15  2.2710E-14  2.7418E-13 -1.5485E-12
 -1.7153E-13  2.4304E-13  1.1084E-14 -3.4823E-14 -1.0441E-13  2.3254E-12
 -3.4260E-15  1.1084E-14  1.7132E-13 -4.1862E-14  2.3378E-15  1.0954E-13
  2.2710E-14 -3.4823E-14 -4.1862E-14  2.5970E-14  2.1570E-14 -3.6817E-13
  2.7418E-13 -1.0441E-13  2.3378E-15  2.1570E-14  5.6352E-13 -1.5179E-12
 -1.5485E-12  2.3254E-12  1.0954E-13 -3.6817E-13 -1.5179E-12  2.4650E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
  -14.609155  154.629461    0.561678   -0.203876   -0.782277  2455946.982176
# Heliocentric elements and errors
Epoch:              2455946.5000  =  2012/01/20
Mean Anomaly:          106.80957 +/-     0.200
Argument of Peri:      131.10606 +/-     0.183
Long of Asc Node:      270.92560 +/-     0.001
Inclination:            16.01178 +/-     0.000
Eccentricity:         0.05500858 +/-    0.0002
Semi-Major Axis:     41.48753022 +/-    0.0065
Time of Perihelion: 2426987.5718 +/-      54.6
Perihelion:          39.20536027 +/-    0.0093
Aphelion:            43.76970018 +/-    0.0097
Period (y)              267.2296 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -36.75057030 +/-    0.0011
Ecliptic Y           18.05115919 +/-    0.0005
Ecliptic Z          -10.46118099 +/-    0.0003
Ecliptic XDOT        -0.00118999 +/-    0.0000
Ecliptic YDOT        -0.00230907 +/-    0.0000
Ecliptic ZDOT        -0.00035215 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.25970106 +/-    0.0010
Geocenter to KBO     41.47536911 +/-    0.0013
# Hcoef:  5.87

The following table shows the complete astrometric record for 15BQ518. 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 (15BQ518) followed by the observatory code and reference code for the source of the astrometry.

2012 01  20.48141  10 04 47.285  -03 48 43.75  22.1w 15BQ518   F51  C~1vYB      
2012 01  20.49450  10 04 47.226  -03 48 43.83  22.2w 15BQ518   F51  C~1vYB      
2012 01  20.50753  10 04 47.184  -03 48 43.55  22.4w 15BQ518   F51  C~1vYB      
2012 01  20.52057  10 04 47.126  -03 48 43.51  22.3w 15BQ518   F51  C~1vYB      
2012 03  21.29722  10 00 19.324  -03 26 33.55  22.3w 15BQ518   F51  C~1vYB      
2012 03  21.31111  10 00 19.268  -03 26 32.91  22.1w 15BQ518   F51  C~1vYB      
2012 03  21.32503  10 00 19.234  -03 26 32.27  22.1w 15BQ518   F51  C~1vYB      
2012 03  21.33897  10 00 19.170  -03 26 31.98  22.0w 15BQ518   F51  C~1vYB      
2015 01  24.54731  10 18 31.062  -05 39 28.07  22.5w 15BQ518   F51  C~1vYB      
2015 01  24.57004  10 18 30.983  -05 39 27.52  22.4w 15BQ518   F51  C~1vYB      
2015 01  24.59200  10 18 30.875  -05 39 27.61  22.0w 15BQ518   F51  C~1vYB      
2015 02  20.42149  10 16 32.668  -05 32 15.55  22.1w 15BQ518   F51  C~1vYB      
2015 02  20.43447  10 16 32.609  -05 32 15.32  22.2w 15BQ518   F51  C~1vYB      
2015 02  20.44716  10 16 32.554  -05 32 14.93  22.0w 15BQ518   F51  C~1vYB      
2015 02  20.45984  10 16 32.489  -05 32 14.50  22.2w 15BQ518   F51  C~1vYB      
2018 04  10.14981  10 27 14.630  -06 58 33.85  22.2R 15BQ518   G37  C~2bHJ      
2018 04  10.20467  10 27 14.445  -06 58 31.27        15BQ518   G37  C~2bHJ      

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    -0.01       0.00     0.00
  2   0.0000      0.00    -0.10       0.00    -0.18
  3   0.0001      0.00     0.06       0.00     0.00
  4   0.0001      0.00    -0.02       0.00    -0.06
  5   0.1665      0.00    -0.12       0.00    -0.28
  6   0.1665      0.00    -0.15       0.00    -0.06
  7   0.1666      0.00     0.15       0.00     0.16
  8   0.1666      0.00     0.00       0.00     0.02
  9   3.0118      0.00     0.02       0.00     0.13
 10   3.0119      0.00     0.21       0.00     0.49
 11   3.0119      0.00    -0.08       0.00     0.22
 12   3.0854      0.00    -0.00       0.00    -0.06
 13   3.0854      0.00     0.03       0.00    -0.13
 14   3.0855      0.00     0.11       0.00    -0.03
 15   3.0855      0.00     0.03       0.00     0.11
 16   6.2195      0.00     0.01       0.00    -0.57
 17   6.2196      0.00    -0.20       0.00     0.24

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.

15BQ518    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        41.493    41.493    41.493
ecceobj         0.056     0.056     0.056
incobj         16.003    16.003    16.003
qmin           38.588    38.590    38.582
qmax           44.789    44.760    44.751
amean          41.556    41.556    41.555
amin           41.240    41.241    41.247
amax           41.890    41.877    41.879
emean           0.055     0.055     0.055
emin            0.043     0.043     0.043
emax            0.069     0.069     0.069
imean          17.767    17.767    17.767
imin           17.141    17.142    17.140
imax           18.352    18.352    18.352
excite_mean     0.310     0.310     0.310
fracstop        1.000     1.000     1.000
cjmean          2.958     2.958     2.958

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       179.3     179.2     179.2
kozaiamp        180.0     180.0     179.9