Orbit Fit and Astrometric record for 16QZ158

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: 16QZ158   
# Created Tue Apr  1 01:10:51 2025
# Orbit generated from Bernstein formalism
# Fitting     19 observations of     19
# Arc:   0.96y
# First observation: 2016/08/01
#  Last observation: 2017/07/19
Preliminary a, adot, b, bdot, g, gdot:
  -0.000037   0.016537   0.000008   0.007375   0.019969   0.000000
# Chi-squared of fit:    10.67 DOF:     32 RMS:  0.13
# Min/Max residuals:    -0.30    0.48
# Exact a, adot, b, bdot, g, gdot:
  1.381288E-05  1.673372E-02  5.425965E-06  7.466867E-03  2.003440E-02  5.038527E-03
# Covariance matrix:
  4.4584E-13  1.3075E-12 -5.1185E-14  7.7934E-13  1.3256E-12  1.0635E-10
  1.3075E-12  1.8057E-10 -4.1798E-12  7.0638E-11  5.1774E-11  9.8856E-09
 -5.1185E-14 -4.1798E-12  2.5059E-13 -1.8286E-12 -1.2547E-12 -2.3084E-10
  7.7934E-13  7.0638E-11 -1.8286E-12  2.8259E-11  2.0931E-11  3.8937E-09
  1.3256E-12  5.1774E-11 -1.2547E-12  2.0931E-11  1.7754E-11  2.9205E-09
  1.0635E-10  9.8856E-09 -2.3084E-10  3.8937E-09  2.9205E-09  5.4467E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.126911   -5.677678    0.712515    0.026950   -0.722472  2457602.044609
# Heliocentric elements and errors
Epoch:              2457600.5000  =  2016/07/31
Mean Anomaly:           44.87111 +/-     2.089
Argument of Peri:      290.06714 +/-     1.781
Long of Asc Node:      348.82731 +/-     0.003
Inclination:            24.14328 +/-     0.014
Eccentricity:         0.29199943 +/-    0.0425
Semi-Major Axis:     59.52432390 +/-    1.7265
Time of Perihelion: 2436692.8871 +/-     346.1
Perihelion:          42.14325496 +/-    2.8120
Aphelion:            76.90539284 +/-    3.3747
Period (y)              459.2508 +/-     19.98
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           50.28036188 +/-    0.0104
Ecliptic Y           -5.71745870 +/-    0.0011
Ecliptic Z            1.85278162 +/-    0.0004
Ecliptic XDOT         0.00087454 +/-    0.0001
Ecliptic YDOT         0.00220424 +/-    0.0000
Ecliptic ZDOT         0.00104523 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   50.63829504 +/-    0.0104
Geocenter to KBO     49.91414215 +/-    0.0105
# Hcoef:  7.59

The following table shows the complete astrometric record for 16QZ158. 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 (16QZ158) followed by the observatory code and reference code for the source of the astrometry.

2016 08  01.54382  23 35 46.98   -00 18 08.1   25.9z 16QZ158   T09  C~86tw      
2016 08  01.56009  23 35 46.95   -00 18 08.2   24.8z 16QZ158   T09  C~86tw      
2016 08  01.59001  23 35 46.87   -00 18 08.7   25.2z 16QZ158   T09  C~86tw      
2016 08  28.38550  23 34 20.52   -00 24 44.0   25.8g 16QZ158   T09  C~86tw      
2016 08  28.39619  23 34 20.47   -00 24 44.1   25.7g 16QZ158   T09  C~86tw      
2016 08  28.41339  23 34 20.41   -00 24 44.8   25.6g 16QZ158   T09  C~86tw      
2016 08  28.41553  23 34 20.39   -00 24 44.3   26.4g 16QZ158   T09  C~86tw      
2016 09  05.35046  23 33 50.63   -00 27 14.6   23.7i 16QZ158   T09  C~86tw      
2016 09  05.40729  23 33 50.41   -00 27 15.8   23.9i 16QZ158   T09  C~86tw      
2016 09  07.43833  23 33 42.63   -00 27 55.6   24.2r 16QZ158   T09  C~86tw      
2016 09  07.46935  23 33 42.51   -00 27 56.3   24.1r 16QZ158   T09  C~86tw      
2017 06  24.54232  23 39 31.17   +00 29 05.6   24.4i 16QZ158   T09  C~8HHJ      
2017 06  24.56112  23 39 31.17   +00 29 05.9   24.1i 16QZ158   T09  C~8HHJ      
2017 06  24.59067  23 39 31.16   +00 29 06.1   24.1i 16QZ158   T09  C~8HHJ      
2017 06  24.61520  23 39 31.14   +00 29 06.1   24.0i 16QZ158   T09  C~8HHJ      
2017 07  19.50009  23 39 05.87   +00 29 31.0   24.1y 16QZ158   T09  C~8HHJ      
2017 07  19.52149  23 39 05.78   +00 29 30.8   23.4y 16QZ158   T09  C~8HHJ      
2017 07  19.55104  23 39 05.74   +00 29 30.6   23.9y 16QZ158   T09  C~8HHJ      
2017 07  19.57811  23 39 05.68   +00 29 30.5   23.8y 16QZ158   T09  C~8HHJ      

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    -0.12       0.00     0.10
     2   0.0000     -0.45     0.10       0.09     0.08
     3   0.0001     -1.75     0.04       0.10    -0.10
     4   0.0735  -1347.68     0.11     149.76    -0.07
     5   0.0735  -1348.41     0.01     149.96     0.08
     6   0.0736  -1349.51    -0.09     149.67    -0.30
     7   0.0736  -1349.59    -0.04     150.25     0.27
     8   0.0953  -1819.04    -0.01     188.90     0.01
     9   0.0955  -1822.55    -0.04     189.11    -0.07
    10   0.1010  -1945.48     0.03     198.74     0.04
    11   0.1011  -1947.41     0.01     198.81    -0.05
    12   0.8953   4210.47    -0.01    1271.31    -0.09
    13   0.8953   4210.59     0.11    1271.59     0.05
    14   0.8954   4210.53     0.07    1271.83     0.07
    15   0.8955   4210.25    -0.20    1271.95     0.01
    16   0.9636   3871.90     0.48    1444.86    -0.10
    17   0.9637   3870.58    -0.25    1445.21     0.10
    18   0.9637   3869.95    -0.05    1445.27    -0.06
    19   0.9638   3869.08    -0.16    1445.53     0.02

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.

16QZ158    quality flag:1

Type:       SCATNEAR  SCATNEAR  SCATEXTD

axisobj        60.075    66.666    56.229
ecceobj         0.293     0.412     0.177
incobj         24.033    23.992    24.074
qmin           41.595    38.311    45.376
qmax           79.080    95.936    67.062
amean          59.868    66.414    56.007
amin           59.228    65.622    55.482
amax           60.649    67.448    56.585
emean           0.288     0.406     0.173
emin            0.274     0.391     0.162
emax            0.304     0.422     0.186
imean          25.025    25.137    24.935
imin           24.688    24.594    24.713
imax           25.387    25.739    25.147
excite_mean     0.512     0.587     0.456
fracstop        1.000     1.000     1.000
cjmean          2.950     2.911     2.973

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       198.0     177.2     190.3
kozaiamp        180.0     180.0     180.0