Orbit Fit and Astrometric record for 15BR518

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: 15BR518   
# Created Sun Apr 22 01:38:15 2018
# Orbit generated from Bernstein formalism
# Fitting   16 observations of   17
# Arc:   3.20y
# First observation: 2015/01/27
#  Last observation: 2018/04/10
Preliminary a, adot, b, bdot, g, gdot:
  -0.000112   0.026104   0.000017  -0.000399   0.024882   0.000000
# Chi-squared of fit:     7.00 DOF:   26 RMS:  0.12
# Min/Max residuals:    -0.25    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.636674E-05  2.629025E-02 -9.674425E-07 -4.050787E-04  2.548386E-02  2.726025E-03
# Covariance matrix:
  2.5470E-13  2.6630E-12  1.0461E-14 -1.0994E-14  1.2298E-12  4.2126E-11
  2.6630E-12  8.3981E-11  2.3912E-13 -3.6035E-13  3.4680E-11  1.3227E-09
  1.0461E-14  2.3912E-13  1.1097E-13 -5.3738E-14  1.0403E-13  3.7382E-12
 -1.0994E-14 -3.6035E-13 -5.3738E-14  1.6026E-13 -1.4781E-13 -5.6949E-12
  1.2298E-12  3.4680E-11  1.0403E-13 -1.4781E-13  1.4548E-11  5.4587E-10
  4.2126E-11  1.3227E-09  3.7382E-12 -5.6949E-12  5.4587E-10  2.0881E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   10.057311  174.002064    0.718296    0.117179   -0.659855  2457050.114008
# Heliocentric elements and errors
Epoch:              2457050.5000  =  2015/01/28
Mean Anomaly:           37.94302 +/-     1.094
Argument of Peri:       45.93239 +/-     1.643
Long of Asc Node:       78.93443 +/-     0.009
Inclination:             9.91075 +/-     0.000
Eccentricity:         0.12613020 +/-    0.0047
Semi-Major Axis:     43.97602013 +/-    0.0668
Time of Perihelion: 2445823.8102 +/-     322.6
Perihelion:          38.42931589 +/-    0.2161
Aphelion:            49.52272436 +/-    0.2213
Period (y)              291.6299 +/-      0.66
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -39.02049791 +/-    0.0058
Ecliptic Y            4.82180641 +/-    0.0006
Ecliptic Z            6.85265415 +/-    0.0010
Ecliptic XDOT        -0.00059329 +/-    0.0000
Ecliptic YDOT        -0.00278352 +/-    0.0000
Ecliptic ZDOT         0.00000839 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.90999804 +/-    0.0056
Geocenter to KBO     39.24052859 +/-    0.0059
# Hcoef:  6.29

The following table shows the complete astrometric record for 15BR518. 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 (15BR518) followed by the observatory code and reference code for the source of the astrometry.

2015 01  27.61323  11 54 09.971  +11 36 14.94  22.9w 15BR518   F51  C~1vYB      
2015 01  27.62539  11 54 09.945  +11 36 15.16  22.6w 15BR518   F51  C~1vYB      
2015 01  27.63752  11 54 09.894  +11 36 15.69  22.3w 15BR518   F51  C~1vYB      
2015 01  27.64961  11 54 09.882  +11 36 15.87  22.7w 15BR518   F51  C~1vYB      
2015 02  16.41057  11 53 03.722  +11 46 48.92  22.3w 15BR518   F51  C~1vYB      
2015 02  16.42200  11 53 03.668  +11 46 49.48  22.3w 15BR518   F51  C~1vYB      
2015 02  16.43346  11 53 03.629  +11 46 49.58  22.6w 15BR518   F51  C~1vYB      
2015 02  16.44491  11 53 03.593  +11 46 50.16  22.7w 15BR518   F51  C~1vYB      
2015 02  17.55525  11 52 59.118  +11 47 27.48  22.5w 15BR518   F51  C~1vYB      
2015 02  17.56710  11 52 59.077  +11 47 27.84  22.3w 15BR518   F51  C~1vYB      
2015 02  17.57901  11 52 59.032  +11 47 28.56  22.3w 15BR518   F51  C~1vYB      
2015 07  09.27728  11 47 21.150  +12 02 06.57  22.2w 15BR518   F51  C~1vYB      
2015 07  09.28241  11 47 21.161  +12 02 06.37  22.1w 15BR518   F51  C~1vYB      
2015 07  09.28756  11 47 21.199  +12 02 06.24  22.2w 15BR518   F51  C~1vYB      
2015 07  09.29271  11 47 21.191  +12 02 06.12  22.1w 15BR518   F51  C~1vYB      
2018 04  10.17783  12 05 48.057  +10 18 37.16  22.2R 15BR518   G37              
2018 04  10.23001  12 05 47.800  +10 18 37.49        15BR518   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    -0.01       0.00     0.15
  2   0.0000     -0.44     0.14       0.05     0.06
  3   0.0001     -1.34    -0.17       0.23     0.11
  4   0.0001     -1.57     0.18       0.32     0.07
  5   0.0542  -1146.18     0.03     187.54    -0.14
  6   0.0542  -1147.14    -0.14     187.74    -0.03
  7   0.0543  -1147.70     0.07     187.60    -0.25
  8   0.0543  -1148.42     0.13     187.91    -0.01
  9   0.0573  -1223.60    -0.14     195.60    -0.12
 10   0.0574  -1224.29    -0.02     195.68    -0.11
 11   0.0574  -1225.19    -0.09     196.08     0.21
 12   0.4453  -6122.50    -0.05    -986.36    -0.02
 13   0.4454  -6122.27    -0.08    -986.47    -0.06
 14   0.4454  -6121.71     0.23    -986.37     0.11
 15   0.4454  -6121.77    -0.09    -986.53     0.03
 16   3.1994  11297.23 (  -0.05)    -53.85 (   0.89)
 17   3.1995  11293.62     0.00     -55.12    -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.

15BR518    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.611    43.849    43.397
ecceobj         0.121     0.135     0.108
incobj          9.905     9.905     9.906
qmin           36.604    36.266    37.163
qmax           51.146    51.902    50.164
amean          43.727    43.962    43.538
amin           43.354    43.571    43.175
amax           44.165    44.398    43.937
emean           0.112     0.147     0.119
emin            0.049     0.123     0.097
emax            0.160     0.171     0.143
imean           8.142     8.413     8.357
imin            6.560     7.249     7.316
imax           10.537     9.869     9.571
excite_mean     0.182     0.207     0.188
fracstop        1.000     1.000     1.000
cjmean          3.059     3.049     3.054

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        84.5     181.4     181.1
kozaiamp         48.2     179.9     179.9