Orbit Fit and Astrometric record for 15UH87

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: 15UH87    
# Created Fri Mar 29 01:18:21 2024
# Orbit generated from Bernstein formalism
# Fitting     15 observations of     15
# Arc:   3.92y
# First observation: 2015/09/05
#  Last observation: 2019/08/07
Preliminary a, adot, b, bdot, g, gdot:
   0.000006   0.006600  -0.000004  -0.001082   0.012342   0.000000
# Chi-squared of fit:     9.89 DOF:     24 RMS:  0.14
# Min/Max residuals:    -0.41    0.39
# Exact a, adot, b, bdot, g, gdot:
  8.505089E-06  6.526395E-03 -1.364118E-06 -1.071564E-03  1.227597E-02 -2.410953E-03
# Covariance matrix:
  4.7459E-13 -1.7633E-13 -4.5605E-14  6.6819E-15  9.1220E-13  1.7490E-12
 -1.7633E-13  7.9109E-13  1.3362E-14 -1.0981E-13  5.0198E-13  2.5507E-11
 -4.5605E-14  1.3362E-14  1.7813E-13 -5.3148E-14 -1.4358E-13 -4.5654E-13
  6.6819E-15 -1.0981E-13 -5.3148E-14  5.4612E-14 -1.1294E-13 -3.9568E-12
  9.1220E-13  5.0198E-13 -1.4358E-13 -1.1294E-13  3.8276E-12  3.7831E-11
  1.7490E-12  2.5507E-11 -4.5654E-13 -3.9568E-12  3.7831E-11  9.8827E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -7.939174  -41.994708   -0.412026   -0.127461   -0.915077  2457270.530809
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          243.36982 +/-     0.499
Argument of Peri:       12.03459 +/-     0.327
Long of Asc Node:       98.32851 +/-     0.006
Inclination:            12.11558 +/-     0.001
Eccentricity:         0.45230086 +/-    0.0014
Semi-Major Axis:     62.42178787 +/-    0.1095
Time of Perihelion: 2515629.9491 +/-     196.6
Perihelion:          34.18835925 +/-    0.1041
Aphelion:            90.65521648 +/-    0.1804
Period (y)              493.1880 +/-      1.30
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           60.92049447 +/-    0.0095
Ecliptic Y          -54.29138125 +/-    0.0086
Ecliptic Z          -11.25149302 +/-    0.0018
Ecliptic XDOT         0.00055164 +/-    0.0000
Ecliptic YDOT         0.00145376 +/-    0.0000
Ecliptic ZDOT        -0.00016237 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   82.37388433 +/-    0.0091
Geocenter to KBO     81.45992981 +/-    0.0130
# Hcoef:  5.93

The following table shows the complete astrometric record for 15UH87. 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 (15UH87) followed by the observatory code and reference code for the source of the astrometry.

2015 09  05.03002  21 32 19.698  -22 58 25.85  25.0r 15UH87    807  C~2ZsZ      
2015 09  05.10552  21 32 19.511  -22 58 26.15        15UH87    807  C~2ZsZ      
2015 09  05.18108  21 32 19.320  -22 58 27.72  25.0r 15UH87    807  C~2ZsZ      
2015 10  16.08581  21 31 02.255  -23 01 54.38        15UH87    304  C~2ZsZ      
2015 10  16.15694  21 31 02.176  -23 01 54.14        15UH87    304  C~2ZsZ      
2015 10  16.18844  21 31 02.143  -23 01 54.19        15UH87    304  C~2ZsZ      
2015 12  09.05158  21 31 15.301  -22 56 00.96        15UH87    304  C~2ZsZ      
2016 09  26.05409  21 33 08.467  -22 57 24.30        15UH87    304  C~2ZsZ      
2016 09  26.15809  21 33 08.266  -22 57 24.73        15UH87    304  C~2ZsZ      
2016 09  27.03407  21 33 06.606  -22 57 28.79        15UH87    304  C~2ZsZ      
2016 09  27.06784  21 33 06.545  -22 57 29.32        15UH87    304  C~2ZsZ      
2019 08  07.330826 21 40 08.49   -22 36 57.9         15UH87    W84  C~5Xnb      
2019 08  07.345386 21 40 08.45   -22 36 58.2         15UH87    W84  C~5Xnb      
2019 08  07.359936 21 40 08.40   -22 36 58.3         15UH87    W84  C~5Xnb      
2019 08  07.374495 21 40 08.37   -22 36 58.5         15UH87    W84  C~5Xnb      

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    -0.00
     2   0.0002     -2.54     0.16       0.55     0.39
     3   0.0004     -5.54    -0.12      -0.09    -0.41
     4   0.1124  -1079.78    -0.10     144.67    -0.24
     5   0.1126  -1080.74     0.00     145.25    -0.02
     6   0.1127  -1081.19     0.02     145.34    -0.09
     7   0.2602   -796.24     0.00     422.10    -0.02
     8   1.0596    657.54     0.03    -158.44     0.03
     9   1.0599    654.78     0.08    -157.95     0.11
    10   1.0623    631.76     0.01    -154.41     0.37
    11   1.0624    630.80    -0.06    -154.64     0.00
    12   3.9214   6549.27     0.05    -905.52    -0.03
    13   3.9215   6548.65     0.01    -905.62    -0.12
    14   3.9215   6547.96    -0.10    -905.48     0.03
    15   3.9215   6547.50     0.02    -905.53    -0.01

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.

15UH87    quality flag:3

Type:          3:1EE     3:1EE     3:1EE

axisobj        62.850    63.190    62.524
ecceobj         0.449     0.453     0.446
incobj         12.125    12.124    12.126
qmin           33.918    33.514    33.960
qmax           93.250    94.109    93.170
amean          62.628    62.634    62.629
amin           61.649    61.390    61.617
amax           63.936    64.168    63.875
emean           0.447     0.452     0.447
emin            0.435     0.438     0.435
emax            0.459     0.468     0.459
imean          10.665    10.152    10.646
imin           10.466     9.652    10.446
imax           10.869    10.624    10.875
excite_mean     0.484     0.485     0.483
fracstop        1.000     1.000     1.000
cjmean          3.017     3.013     3.017

libcent 0       180.3     179.5     179.8
libamp  0       152.8     171.6     155.0
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       148.9     163.8     155.9
kozaiamp        180.0     179.9     179.9