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 Oct 24 01:38:33 2017
# Orbit generated from Bernstein formalism
# Fitting   15 observations of   15
# Arc:  56.02d
# First observation: 2015/01/28
#  Last observation: 2015/03/25
Preliminary a, adot, b, bdot, g, gdot:
   0.000004   0.026419  -0.000006  -0.012164   0.026715   0.000000
# Chi-squared of fit:     7.36 DOF:   24 RMS:  0.12
# Min/Max residuals:    -0.26    0.38
# Exact a, adot, b, bdot, g, gdot:
  1.486017E-05  2.447541E-02 -7.308900E-06 -1.195806E-02  2.619686E-02 -4.156716E-03
# Covariance matrix:
  4.8722E-13  5.8128E-12 -4.3875E-14 -1.4224E-12  3.5457E-12  5.9690E-10
  5.8128E-12  2.3442E-08 -7.4245E-11 -1.8081E-09  4.7987E-09  2.3285E-07
 -4.3875E-14 -7.4245E-11  4.9262E-13  3.5196E-12 -1.5370E-11 -7.7964E-10
 -1.4224E-12 -1.8081E-09  3.5196E-12  1.7515E-10 -3.7724E-10 -1.9786E-08
  3.5457E-12  4.7987E-09 -1.5370E-11 -3.7724E-10  9.9929E-10  5.1994E-08
  5.9690E-10  2.3285E-07 -7.7964E-10 -1.9786E-08  5.1994E-08  3.4821E-06
#      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:          308.91156 +/-     3.715
Argument of Peri:      222.86449 +/-     9.920
Long of Asc Node:       17.27591 +/-     0.151
Inclination:            28.64890 +/-     0.141
Eccentricity:         0.18761032 +/-    0.0655
Semi-Major Axis:     42.81101544 +/-    0.8409
Time of Perihelion: 2471570.0075 +/-     965.4
Perihelion:          34.77922718 +/-    2.8869
Aphelion:            50.84280369 +/-    2.9774
Period (y)              280.1183 +/-      8.25
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.58724111 +/-    0.0446
Ecliptic Y            4.76455170 +/-    0.0048
Ecliptic Z            8.58387043 +/-    0.0104
Ecliptic XDOT        -0.00013673 +/-    0.0002
Ecliptic YDOT        -0.00256387 +/-    0.0000
Ecliptic ZDOT        -0.00131533 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.84822362 +/-    0.0432
Geocenter to KBO     38.17250854 +/-    0.0461
# 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      

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     0.02
  2   0.0000     -0.66    -0.06       0.13     0.05
  3   0.0001     -1.17     0.05       0.12    -0.05
  4   0.0517  -1164.11     0.18     111.39    -0.07
  5   0.0518  -1165.11    -0.01     111.65     0.16
  6   0.0518  -1165.98    -0.06     111.50    -0.02
  7   0.0518  -1166.36     0.38     111.41    -0.14
  8   0.0573  -1308.66    -0.26     116.85     0.02
  9   0.0573  -1309.20    -0.01     117.03     0.17
 10   0.0573  -1310.11    -0.11     116.89     0.01
 11   0.0574  -1310.86    -0.08     116.72    -0.17
 12   0.1533  -4051.45    -0.01     -21.21     0.14
 13   0.1533  -4052.36    -0.01     -21.67    -0.19
 14   0.1533  -4053.30    -0.04     -21.62    -0.02
 15   0.1534  -4054.10     0.07     -21.65     0.08

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:1

Type:       SCATEXTD  CENTAURR  SCATEXTD

axisobj        42.471    45.977    41.588
ecceobj         0.184     0.362     0.128
incobj         28.743    29.128    28.815
qmin           33.711    28.379    35.353
qmax           51.909    65.058    48.420
amean          42.592    46.340    41.731
amin           42.200    45.664    41.391
amax           43.012    47.864    42.104
emean           0.185     0.362     0.133
emin            0.162     0.328     0.117
emax            0.207     0.384     0.150
imean          28.544    29.182    28.566
imin           27.936    28.461    28.161
imax           29.082    30.076    28.969
excite_mean     0.512     0.607     0.496
fracstop        1.000     0.137     1.000
cjmean          2.760     2.667     2.770

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       190.5     283.7     183.3
kozaiamp        180.0     179.8     180.0