Orbit Fit and Astrometric record for 15QW33

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: 15QW33    
# Created Tue Dec  7 02:13:32 2021
# Orbit generated from Bernstein formalism
# Fitting      9 observations of      9
# Arc:   2.94y
# First observation: 2014/12/15
#  Last observation: 2017/11/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.000047   0.016318  -0.000012   0.003066   0.019986   0.000000
# Chi-squared of fit:     1.40 DOF:     12 RMS:  0.07
# Min/Max residuals:    -0.13    0.13
# Exact a, adot, b, bdot, g, gdot:
  1.280728E-05  1.604523E-02  2.661168E-06  3.025402E-03  1.983110E-02 -2.551590E-03
# Covariance matrix:
  1.3690E-12 -1.7272E-12  9.2462E-14 -2.0428E-13 -5.6145E-13 -2.5248E-11
 -1.7272E-12  3.9148E-12 -3.3847E-13  5.0593E-13  3.3192E-13  6.5206E-11
  9.2462E-14 -3.3847E-13  5.6113E-13 -2.9659E-13  3.7195E-14 -5.9729E-12
 -2.0428E-13  5.0593E-13 -2.9659E-13  2.4213E-13  5.2630E-14  8.8094E-12
 -5.6145E-13  3.3192E-13  3.7195E-14  5.2630E-14  7.3465E-13  5.0126E-12
 -2.5248E-11  6.5206E-11 -5.9729E-12  8.8094E-12  5.0126E-12  1.1373E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
  -18.767391   17.733615   -0.891283   -0.133770   -0.394303  2457006.649748
# Heliocentric elements and errors
Epoch:              2457000.5000  =  2014/12/09
Mean Anomaly:          239.89909 +/-     0.418
Argument of Peri:       75.09613 +/-     0.391
Long of Asc Node:       77.48348 +/-     0.003
Inclination:            21.51620 +/-     0.001
Eccentricity:         0.17579124 +/-    0.0013
Semi-Major Axis:     45.86067766 +/-    0.0175
Time of Perihelion: 2494845.0123 +/-     129.9
Perihelion:          37.79877231 +/-    0.0635
Aphelion:            53.92258302 +/-    0.0652
Period (y)              310.5767 +/-      0.18
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           45.59832711 +/-    0.0020
Ecliptic Y           15.52001892 +/-    0.0007
Ecliptic Z          -16.22328882 +/-    0.0007
Ecliptic XDOT        -0.00086850 +/-    0.0000
Ecliptic YDOT         0.00204412 +/-    0.0000
Ecliptic ZDOT         0.00050891 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   50.82591389 +/-    0.0018
Geocenter to KBO     50.42585092 +/-    0.0022
# Hcoef:  6.69

The following table shows the complete astrometric record for 15QW33. 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 (15QW33) followed by the observatory code and reference code for the source of the astrometry.

2014 12  15.14897  01 34 05.682  -10 23 47.74  24.7r 15QW33    W84  C~55Wc      
2015 08  23.38262  01 43 28.126  -09 23 54.30  23.8i 15QW33    W84  C~55Wc      
2015 11  06.20466  01 39 14.319  -09 53 19.91  23.4i 15QW33    W84  C~55Wc      
2015 11  15.13264  01 38 41.498  -09 54 33.32  23.1i 15QW33    W84  C~55Wc      
2015 11  15.13401  01 38 41.500  -09 54 33.28  23.8r 15QW33    W84  C~55Wc      
2016 10  03.27622  01 44 37.190  -09 11 30.18  23.9r 15QW33    W84  C~55Wc      
2016 11  04.16401  01 42 31.661  -09 21 34.81  22.1r 15QW33    W84  C~55Wc      
2017 11  18.11962  01 44 53.609  -08 51 43.74  23.7r 15QW33    W84  C~55Wd      
2017 11  24.16130  01 44 33.278  -08 52 01.38  24.0i 15QW33    W84  C~55Wd      

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    -0.00       0.00    -0.05
     2   0.6878   9060.00     0.02      82.43    -0.08
     3   0.8927   4910.38    -0.13     -78.45     0.01
     4   0.9171   4434.75     0.02      42.44     0.04
     5   0.9171   4434.79     0.13      42.46     0.04
     6   1.8019  10294.96     0.04     366.52     0.03
     7   1.8892   8344.33    -0.11     538.21     0.11
     8   2.9267  10986.23     0.06    1363.75    -0.01
     9   2.9432  10701.38    -0.03    1465.84    -0.09

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.

15QW33    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        46.224    46.272    46.179
ecceobj         0.168     0.172     0.165
incobj         21.508    21.508    21.508
qmin           37.357    37.247    37.493
qmax           54.949    55.202    54.645
amean          45.982    46.018    45.930
amin           45.593    45.605    45.532
amax           46.422    46.474    46.367
emean           0.169     0.172     0.165
emin            0.155     0.157     0.151
emax            0.184     0.189     0.179
imean          20.178    20.183    20.171
imin           19.840    19.819    19.850
imax           20.620    20.629    20.599
excite_mean     0.384     0.386     0.383
fracstop        1.000     1.000     1.000
cjmean          2.941     2.940     2.942

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       174.2     173.8     174.8
kozaiamp        180.0     180.0     179.9