Orbit Fit and Astrometric record for 16QN158

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: 16QN158   
# Created Thu Oct 31 01:10:27 2024
# Orbit generated from Bernstein formalism
# Fitting     19 observations of     19
# Arc:   4.19y
# First observation: 2015/07/20
#  Last observation: 2019/09/27
Preliminary a, adot, b, bdot, g, gdot:
  -0.000044   0.026215   0.000035   0.010195   0.026279   0.000000
# Chi-squared of fit:    14.82 DOF:     32 RMS:  0.16
# Min/Max residuals:    -0.55    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.482294E-05  2.632365E-02  6.449235E-06  1.019241E-02  2.685192E-02  3.332650E-03
# Covariance matrix:
  5.9318E-13 -6.6850E-13  2.0277E-13 -2.8478E-13 -1.1218E-13 -5.9461E-12
 -6.6850E-13  1.0655E-12 -3.2251E-13  4.4399E-13  6.1395E-13  9.3389E-12
  2.0277E-13 -3.2251E-13  3.0890E-13 -2.4360E-13 -1.3276E-13 -3.1710E-12
 -2.8478E-13  4.4399E-13 -2.4360E-13  2.8006E-13  1.5992E-13  4.4167E-12
 -1.1218E-13  6.1395E-13 -1.3276E-13  1.5992E-13  1.3640E-12  3.5415E-12
 -5.9461E-12  9.3389E-12 -3.1710E-12  4.4167E-12  3.5415E-12  9.2500E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.770482   -7.029125    0.838108    0.038050   -0.575731  2457224.074673
# Heliocentric elements and errors
Epoch:              2457220.5000  =  2015/07/17
Mean Anomaly:           48.74083 +/-     0.051
Argument of Peri:      310.19623 +/-     0.080
Long of Asc Node:      342.24675 +/-     0.000
Inclination:            21.56266 +/-     0.001
Eccentricity:         0.11812757 +/-    0.0003
Semi-Major Axis:     40.62704090 +/-    0.0083
Time of Perihelion: 2444414.5541 +/-      12.8
Perihelion:          35.82786739 +/-    0.0158
Aphelion:            45.42621442 +/-    0.0168
Period (y)              258.9590 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           37.34804124 +/-    0.0016
Ecliptic Y           -5.44968346 +/-    0.0002
Ecliptic Z            2.44926585 +/-    0.0001
Ecliptic XDOT         0.00059491 +/-    0.0000
Ecliptic YDOT         0.00262439 +/-    0.0000
Ecliptic ZDOT         0.00105939 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.82293137 +/-    0.0016
Geocenter to KBO     37.24128174 +/-    0.0016
# Hcoef:  9.17

The following table shows the complete astrometric record for 16QN158. 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 (16QN158) followed by the observatory code and reference code for the source of the astrometry.

2015 07  20.573884 23 28 13.51   +00 40 26.0         16QN158   T09  C~83Ea      
2015 07  20.617410 23 28 13.39   +00 40 25.7         16QN158   T09  C~83Ea      
2016 08  01.45987  23 32 11.10   +01 46 29.6   24.9z 16QN158   T09  C~83Ea      
2016 08  01.48148  23 32 11.01   +01 46 29.6   25.0z 16QN158   T09  C~83Ea      
2016 08  01.49500  23 32 10.96   +01 46 29.8   24.5z 16QN158   T09  C~83Ea      
2016 08  01.50310  23 32 10.94   +01 46 29.8   24.0z 16QN158   T09  C~83Ea      
2016 08  01.52754  23 32 10.85   +01 46 29.4   24.3z 16QN158   T09  C~83Ea      
2016 08  01.55200  23 32 10.77   +01 46 29.3   24.7z 16QN158   T09  C~83Ea      
2016 08  01.57640  23 32 10.68   +01 46 28.8   24.2z 16QN158   T09  C~83Ea      
2016 08  28.39408  23 30 16.67   +01 38 48.9   25.9g 16QN158   T09  C~83Ea      
2016 08  28.41119  23 30 16.60   +01 38 48.5   25.5g 16QN158   T09  C~83Ea      
2016 08  28.41778  23 30 16.55   +01 38 48.2   25.9g 16QN158   T09  C~83Ea      
2016 08  28.41990  23 30 16.55   +01 38 48.4   25.9g 16QN158   T09  C~83Ea      
2016 09  07.39090  23 29 27.10   +01 34 49.3   25.2r 16QN158   T09  C~83Ea      
2016 09  07.45841  23 29 26.76   +01 34 47.6   24.6r 16QN158   T09  C~83Ea      
2016 09  07.48918  23 29 26.60   +01 34 46.8   25.0r 16QN158   T09  C~83Ea      
2017 06  24.574465 23 37 56.78   +02 52 44.1         16QN158   T09  C~83Ea      
2019 09  27.251196 23 41 43.17   +04 49 06.5         16QN158   T09  C~83Ea      
2019 09  27.272128 23 41 43.07   +04 49 05.9         16QN158   T09  C~83Ea      

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     0.14       0.00    -0.09
     2   0.0001     -1.77     0.10       0.43    -0.15
     3   1.0346   4839.14    -0.17    2236.14    -0.55
     4   1.0347   4837.90    -0.26    2236.67    -0.26
     5   1.0347   4837.29    -0.14    2237.15     0.07
     6   1.0347   4837.01     0.02    2237.27     0.10
     7   1.0348   4835.62    -0.07    2237.43    -0.01
     8   1.0348   4834.47     0.10    2237.82     0.09
     9   1.0349   4833.04    -0.03    2237.89    -0.11
    10   1.1083   3080.13    -0.09    2489.65     0.25
    11   1.1084   3079.01     0.10    2489.70     0.15
    12   1.1084   3078.20    -0.20    2489.72     0.12
    13   1.1084   3078.28     0.04    2489.90     0.28
    14   1.1357   2302.46     0.03    2562.81     0.09
    15   1.1359   2297.11     0.13    2563.26     0.05
    16   1.1360   2294.59     0.09    2563.47     0.04
    17   1.9302  11178.22     0.20    3850.87     0.04
    18   4.1880  17073.88    -0.03    8963.91    -0.03
    19   4.1881  17072.26     0.05    8963.94    -0.08

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.

16QN158    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        40.943    40.970    40.916
ecceobj         0.122     0.123     0.121
incobj         21.477    21.478    21.477
qmin           35.069    35.134    35.141
qmax           46.857    46.804    46.737
amean          40.842    40.854    40.804
amin           40.500    40.508    40.477
amax           41.202    41.228    41.156
emean           0.121     0.120     0.119
emin            0.104     0.104     0.104
emax            0.138     0.137     0.136
imean          22.181    22.208    22.192
imin           21.477    21.490    21.464
imax           22.793    22.811    22.788
excite_mean     0.396     0.396     0.396
fracstop        1.000     1.000     1.000
cjmean          2.877     2.877     2.877

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       174.9     174.8     175.4
kozaiamp        180.0     180.0     179.9