Orbit Fit and Astrometric record for 17QU131

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: 17QU131   
# Created Fri Dec  3 02:13:58 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting      8 observations of      8
# Arc:   5.07y
# First observation: 2013/10/11
#  Last observation: 2018/11/06
# Chi-squared of fit:     5.48 DOF:     10 RMS:  0.15
# Min/Max residuals:    -0.29    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.615340E-05  2.744567E-02 -7.007121E-06 -1.101424E-02  2.657972E-02  3.992558E-03
# Covariance matrix:
  1.3759E-12 -8.0943E-13 -1.6227E-13  2.2777E-13 -2.1574E-13 -4.0577E-12
 -8.0943E-13  9.9838E-13  2.7121E-13 -3.7747E-13  2.6480E-13  6.7273E-12
 -1.6227E-13  2.7121E-13  1.1153E-12 -3.6400E-13  6.4281E-14  1.9769E-12
  2.2777E-13 -3.7747E-13 -3.6400E-13  2.3007E-13 -1.1038E-13 -2.7521E-12
 -2.1574E-13  2.6480E-13  6.4281E-14 -1.1038E-13  6.8630E-13  1.9487E-12
 -4.0577E-12  6.7273E-12  1.9769E-12 -2.7521E-12  1.9487E-12  4.9048E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   -7.785393   10.772252   -0.120915   -0.134083   -0.981582  2456576.723078
# Heliocentric elements and errors
Epoch:              2456576.5000  =  2013/10/11
Mean Anomaly:           21.78966 +/-     0.022
Argument of Peri:      161.85919 +/-     0.044
Long of Asc Node:      172.76751 +/-     0.001
Inclination:            23.10570 +/-     0.000
Eccentricity:         0.26585198 +/-    0.0002
Semi-Major Axis:     50.26679078 +/-    0.0114
Time of Perihelion: 2448697.5552 +/-       8.5
Perihelion:          36.90326487 +/-    0.0144
Aphelion:            63.63031669 +/-    0.0186
Period (y)              356.3936 +/-      0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           37.56900847 +/-    0.0011
Ecliptic Y            7.27404196 +/-    0.0002
Ecliptic Z           -5.09678040 +/-    0.0002
Ecliptic XDOT        -0.00028525 +/-    0.0000
Ecliptic YDOT         0.00282323 +/-    0.0000
Ecliptic ZDOT        -0.00117964 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.60456448 +/-    0.0011
Geocenter to KBO     37.62262208 +/-    0.0012
# Hcoef:  7.81

The following table shows the complete astrometric record for 17QU131. 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 (17QU131) followed by the observatory code and reference code for the source of the astrometry.

2013 10  11.22230  00 51 47.613  -02 54 06.29  23.9g 17QU131   W84  C~52bv      
2015 12  05.05359  01 01 47.853  -03 09 57.06  23.9r 17QU131   W84  C~52bv      
2016 09  01.36019  01 14 37.780  -02 23 11.29  24.3g 17QU131   W84  C~52bv      
2017 08  22.42110  01 21 37.589  -02 14 56.40  23.1i 17QU131   W84  C~52bv      
2017 08  28.34592  01 21 22.072  -02 18 19.85  23.6i 17QU131   W84  C~52bv      
2017 09  18.27315  01 20 08.680  -02 31 10.29  23.7r 17QU131   W84  C~52bv      
2018 11  06.19384  01 23 00.060  -02 55 23.65  23.8r 17QU131   W84  C~52bv      
2018 11  06.19522  01 23 00.048  -02 55 23.67  23.6i 17QU131   W84  C~52bv      

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     0.10
     2   2.1488      0.00    -0.00       0.00    -0.07
     3   2.8915      0.00     0.05       0.00    -0.29
     4   3.8637      0.00    -0.14       0.00    -0.19
     5   3.8799      0.00     0.17       0.00     0.22
     6   3.9372      0.00    -0.04       0.00     0.28
     7   5.0704      0.00     0.05       0.00    -0.03
     8   5.0704      0.00    -0.04       0.00    -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.

17QU131    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        50.634    50.634    50.634
ecceobj         0.272     0.272     0.272
incobj         23.044    23.044    23.044
qmin           35.371    35.392    35.368
qmax           65.717    65.698    65.800
amean          50.282    50.282    50.282
amin           49.805    49.806    49.807
amax           50.861    50.887    50.864
emean           0.275     0.275     0.275
emin            0.256     0.256     0.256
emax            0.294     0.293     0.295
imean          22.238    22.238    22.238
imin           21.536    21.542    21.543
imax           22.768    22.774    22.767
excite_mean     0.468     0.468     0.468
fracstop        1.000     1.000     1.000
cjmean          2.898     2.898     2.898

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       191.0     190.9     191.0
kozaiamp        180.0     180.0     179.9