Orbit Fit and Astrometric record for 16QD135

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: 16QD135   
# Created Fri Dec  3 02:13:51 2021
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:   2.21y
# First observation: 2016/08/31
#  Last observation: 2018/11/15
Preliminary a, adot, b, bdot, g, gdot:
   0.000001   0.024209   0.000006  -0.007853   0.024618   0.000000
# Chi-squared of fit:     5.05 DOF:     30 RMS:  0.09
# Min/Max residuals:    -0.13    0.22
# Exact a, adot, b, bdot, g, gdot:
  1.589852E-05  2.425718E-02 -5.281781E-06 -7.879841E-03  2.466218E-02  1.871997E-03
# Covariance matrix:
  3.6841E-13  1.3374E-13  5.2476E-15 -7.7114E-14  4.1508E-13  4.4623E-12
  1.3374E-13  9.1876E-13  5.2314E-14 -3.3946E-13  8.4396E-13  2.0789E-11
  5.2476E-15  5.2314E-14  1.8854E-13 -1.3525E-13  3.9875E-14  1.5461E-12
 -7.7114E-14 -3.3946E-13 -1.3525E-13  2.7044E-13 -3.2043E-13 -9.2909E-12
  4.1508E-13  8.4396E-13  3.9875E-14 -3.2043E-13  1.1166E-12  1.9251E-11
  4.4623E-12  2.0789E-11  1.5461E-12 -9.2909E-12  1.9251E-11  5.7348E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -21.290212    6.901401    0.484752   -0.322254   -0.827422  2457631.744859
# Heliocentric elements and errors
Epoch:              2457630.5000  =  2016/08/30
Mean Anomaly:           22.69085 +/-     0.278
Argument of Peri:      200.71026 +/-     0.385
Long of Asc Node:      139.10100 +/-     0.002
Inclination:            27.47198 +/-     0.001
Eccentricity:         0.13546925 +/-    0.0005
Semi-Major Axis:     47.10580325 +/-    0.0077
Time of Perihelion: 2450187.3244 +/-      91.2
Perihelion:          40.72441532 +/-    0.0257
Aphelion:            53.48719117 +/-    0.0263
Period (y)              323.3105 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           38.44288253 +/-    0.0016
Ecliptic Y            4.16275351 +/-    0.0002
Ecliptic Z          -14.72283301 +/-    0.0006
Ecliptic XDOT        -0.00044508 +/-    0.0000
Ecliptic YDOT         0.00265153 +/-    0.0000
Ecliptic ZDOT        -0.00089056 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.37566370 +/-    0.0015
Geocenter to KBO     40.54791262 +/-    0.0017
# Hcoef:  7.08

The following table shows the complete astrometric record for 16QD135. 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 (16QD135) followed by the observatory code and reference code for the source of the astrometry.

2016 08  31.24407  00 59 50.260  -16 46 25.92  23.2r 16QD135   W84  C~55Zd      
2016 08  31.24639  00 59 50.250  -16 46 25.92  22.8i 16QD135   W84  C~55Zd      
2016 08  31.24776  00 59 50.255  -16 46 26.22  23.9g 16QD135   W84  C~55Zd      
2016 09  03.22440  00 59 39.783  -16 48 34.95  23.0z 16QD135   W84  C~55Zd      
2016 10  27.13397  00 55 43.466  -17 17 37.66  23.4i 16QD135   W84  C~55Zd      
2016 10  27.13534  00 55 43.450  -17 17 37.53  23.3r 16QD135   W84  C~55Zd      
2016 10  27.13673  00 55 43.462  -17 17 37.41  23.6g 16QD135   W84  C~55Zd      
2016 11  07.12473  00 54 58.112  -17 19 48.92  23.0z 16QD135   W84  C~55Zd      
2017 11  18.14800  01 00 21.749  -17 11 02.30  22.8i 16QD135   W84  C~55Zd      
2017 11  18.14937  01 00 21.747  -17 11 02.29  24.1g 16QD135   W84  C~55Zd      
2017 11  22.18774  01 00 08.781  -17 10 53.12  23.1r 16QD135   W84  C~55Zd      
2017 11  26.07878  00 59 57.373  -17 10 32.06  23.1z 16QD135   W84  C~55Zd      
2017 11  27.04262  00 59 54.719  -17 10 24.91  23.1i 16QD135   W84  C~55Zd      
2017 12  08.05399  00 59 29.612  -17 08 10.46  23.2r 16QD135   W84  C~55Zd      
2018 10  18.29039  01 08 31.992  -16 54 35.36  23.2r 16QD135   W84  C~55Zd      
2018 10  18.29174  01 08 31.994  -16 54 35.23  24.3g 16QD135   W84  C~55Zd      
2018 10  20.07305  01 08 23.798  -16 55 17.13  22.2z 16QD135   W84  C~55Zd      
2018 11  15.20378  01 06 33.735  -17 00 56.18  23.2i 16QD135   W84  C~55Zd      

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    -0.07       0.00     0.05
     2   0.0000     -0.13    -0.05       0.06     0.15
     3   0.0000     -0.19    -0.02      -0.24    -0.13
     4   0.0082   -190.27     0.15     -55.51    -0.13
     5   0.1558  -3996.25    -0.01    -255.76    -0.09
     6   0.1558  -3996.41    -0.08    -255.55     0.11
     7   0.1558  -3996.20     0.22    -255.51     0.13
     8   0.1858  -4643.19    -0.13    -111.14    -0.11
     9   1.2153   -197.90    -0.04   -1531.24     0.09
    10   1.2153   -197.93    -0.00   -1531.22     0.08
    11   1.2264   -363.37     0.13   -1446.14     0.13
    12   1.2371   -503.60    -0.01   -1359.48    -0.11
    13   1.2397   -535.30    -0.05   -1337.28    -0.13
    14   1.2698   -807.71    -0.02   -1066.42    -0.01
    15   2.1302   6605.05    -0.07   -3573.06    -0.05
    16   2.1302   6605.13     0.11   -3572.95     0.05
    17   2.1351   6480.68    -0.07   -3561.21    -0.03
    18   2.2066   4904.22     0.02   -3202.95     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.

16QD135    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        47.669    47.698    47.640
ecceobj         0.145     0.146     0.144
incobj         27.425    27.425    27.424
qmin           39.555    39.502    39.667
qmax           55.681    55.849    55.443
amean          47.406    47.436    47.370
amin           47.019    47.023    46.959
amax           47.882    47.905    47.824
emean           0.145     0.147     0.143
emin            0.129     0.131     0.127
emax            0.163     0.166     0.160
imean          26.049    26.040    26.055
imin           25.681    25.673    25.692
imax           26.370    26.356    26.381
excite_mean     0.463     0.463     0.462
fracstop        1.000     1.000     1.000
cjmean          2.866     2.865     2.866

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       195.2     196.8     192.4
kozaiamp        180.0     179.9     179.9