Orbit Fit and Astrometric record for 15KU186

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: 15KU186   
# Created Fri Dec  3 02:13:25 2021
# Orbit generated from Bernstein formalism
# Fitting      7 observations of      7
# Arc:  63.67d
# First observation: 2015/05/18
#  Last observation: 2015/07/21
Preliminary a, adot, b, bdot, g, gdot:
  -0.000005   0.016046  -0.000007  -0.002447   0.018520   0.000000
# Chi-squared of fit:     0.69 DOF:      8 RMS:  0.06
# Min/Max residuals:    -0.07    0.11
# Exact a, adot, b, bdot, g, gdot:
  1.101566E-05  1.323167E-02 -2.552637E-06 -2.887641E-03  1.810703E-02 -5.919888E-04
# Covariance matrix:
  5.1097E-13  1.6213E-11 -3.1373E-14  2.5868E-12  4.0565E-12  1.5840E-10
  1.6213E-11  1.7794E-08 -3.7171E-11  2.7587E-09  2.6530E-09 -2.7312E-07
 -3.1373E-14 -3.7171E-11  4.8036E-13 -8.6216E-12 -5.4393E-12  6.1478E-10
  2.5868E-12  2.7587E-09 -8.6216E-12  4.7160E-10  4.0721E-10 -4.4314E-08
  4.0565E-12  2.6530E-09 -5.4393E-12  4.0721E-10  4.1304E-10 -3.4654E-08
  1.5840E-10 -2.7312E-07  6.1478E-10 -4.4314E-08 -3.4654E-08  6.4911E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
   16.650387 -119.562308    0.059248    0.288918   -0.965722  2457160.879768
# Heliocentric elements and errors
Epoch:              2457160.5000  =  2015/05/18
Mean Anomaly:          193.39324 +/-    41.412
Argument of Peri:      297.04917 +/-    42.014
Long of Asc Node:      112.50123 +/-     0.383
Inclination:            20.39338 +/-     0.098
Eccentricity:         0.20547113 +/-    0.0152
Semi-Major Axis:     46.76656806 +/-    0.8623
Time of Perihelion: 2511222.4605 +/-   13354.4
Perihelion:          37.15738846 +/-    0.9868
Aphelion:            56.37574765 +/-    1.2589
Period (y)              319.8243 +/-      8.85
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -26.65662929 +/-    0.0293
Ecliptic Y          -46.87133999 +/-    0.0516
Ecliptic Z           15.82422113 +/-    0.0178
Ecliptic XDOT         0.00171799 +/-    0.0002
Ecliptic YDOT        -0.00102743 +/-    0.0003
Ecliptic ZDOT        -0.00044389 +/-    0.0001
# Distances at JD0 (AU)
Heliocenter to KBO   56.19523442 +/-    0.0455
Geocenter to KBO     55.22718311 +/-    0.0620
# Hcoef:  7.91

The following table shows the complete astrometric record for 15KU186. 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 (15KU186) followed by the observatory code and reference code for the source of the astrometry.

2015 05  18.37899  16 06 52.510  -03 56 00.91        15KU186   568  C~3wq3      
2015 05  18.51819  16 06 51.980  -03 55 59.35        15KU186   568  C~3wq3      
2015 05  18.59568  16 06 51.692  -03 55 58.62  25.3r 15KU186   568  C~3wq3      
2015 06  12.44304  16 05 21.210  -03 53 12.06        15KU186   568  C~3wq3      
2015 06  12.51510  16 05 20.958  -03 53 12.00        15KU186   568  C~3wq3      
2015 07  20.16662  16 03 34.535  -03 55 54.95        15KU186   304  C~3wq3      
2015 07  21.04665  16 03 32.854  -03 56 04.90        15KU186   304  C~3wq3      

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     0.11       0.00     0.01
     2   0.0004     -8.08    -0.07      -0.03     0.05
     3   0.0006    -12.45    -0.05      -0.16    -0.05
     4   0.0686  -1372.83    -0.04    -103.54     0.05
     5   0.0688  -1376.54     0.04    -104.22    -0.06
     6   0.1719  -2905.83     0.01    -578.42     0.07
     7   0.1743  -2928.53    -0.01    -593.15    -0.07

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.

15KU186    quality flag:1

Type:       SCATEXTD  CENTAURS  SCATNEAR

axisobj        46.467    61.571    45.624
ecceobj         0.214     0.507     0.235
incobj         20.377    20.185    20.620
qmin           36.301    29.671    34.244
qmax           57.693    96.028    58.237
amean          46.783    61.410    45.973
amin           46.381    58.299    45.519
amax           47.262    63.135    46.535
emean           0.206     0.484     0.234
emin            0.191     0.446     0.215
emax            0.222     0.522     0.254
imean          18.893    20.424    18.967
imin           18.375    17.334    18.096
imax           19.370    22.662    19.668
excite_mean     0.384     0.597     0.400
fracstop        1.000     1.000     1.000
cjmean          2.952     2.832     2.927

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       179.0     178.0     175.3
kozaiamp        180.0     180.0     180.0