Orbit Fit and Astrometric record for 16QA135

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: 16QA135   
# Created Sat Dec  4 02:13:53 2021
# Orbit generated from Bernstein formalism
# Fitting     16 observations of     16
# Arc:   2.20y
# First observation: 2016/08/26
#  Last observation: 2018/11/07
Preliminary a, adot, b, bdot, g, gdot:
  -0.000018   0.023088  -0.000012  -0.012087   0.025088   0.000000
# Chi-squared of fit:     2.27 DOF:     26 RMS:  0.07
# Min/Max residuals:    -0.18    0.11
# Exact a, adot, b, bdot, g, gdot:
  1.403846E-05  2.329081E-02 -8.030045E-06 -1.221932E-02  2.534666E-02  4.575463E-03
# Covariance matrix:
  2.9532E-13 -7.6818E-14  6.6187E-16 -8.2194E-15  1.9555E-13  2.9945E-13
 -7.6818E-14  7.3544E-13  1.0544E-13 -4.9412E-13  4.5767E-13  1.9688E-11
  6.6187E-16  1.0544E-13  2.2861E-13 -2.2765E-13  6.5222E-14  3.7608E-12
 -8.2194E-15 -4.9412E-13 -2.2765E-13  5.9357E-13 -3.1516E-13 -1.7524E-11
  1.9555E-13  4.5767E-13  6.5222E-14 -3.1516E-13  6.4040E-13  1.2505E-11
  2.9945E-13  1.9688E-11  3.7608E-12 -1.7524E-11  1.2505E-11  6.9877E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -3.663346    0.652861    0.463485   -0.057353   -0.898301  2457626.705879
# Heliocentric elements and errors
Epoch:              2457620.5000  =  2016/08/20
Mean Anomaly:           41.89185 +/-     0.060
Argument of Peri:      126.67016 +/-     0.139
Long of Asc Node:      173.21728 +/-     0.000
Inclination:            27.96163 +/-     0.001
Eccentricity:         0.20583478 +/-    0.0010
Semi-Major Axis:     46.34182694 +/-    0.0213
Time of Perihelion: 2444211.8455 +/-      16.7
Perihelion:          36.80306736 +/-    0.0488
Aphelion:            55.88058653 +/-    0.0525
Period (y)              315.4772 +/-      0.22
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           40.27142614 +/-    0.0012
Ecliptic Y           -0.00709029 +/-    0.0000
Ecliptic Z           -2.52111603 +/-    0.0001
Ecliptic XDOT         0.00038173 +/-    0.0000
Ecliptic YDOT         0.00251332 +/-    0.0000
Ecliptic ZDOT        -0.00134879 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.35026443 +/-    0.0012
Geocenter to KBO     39.45292361 +/-    0.0012
# Hcoef:  6.83

The following table shows the complete astrometric record for 16QA135. 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 (16QA135) followed by the observatory code and reference code for the source of the astrometry.

2016 08  26.20509  00 08 13.778  -03 06 04.04  22.8r 16QA135   W84  C~55Zc      
2016 09  09.15769  00 07 16.684  -03 14 29.91  23.1z 16QA135   W84  C~55Zc      
2016 09  09.15907  00 07 16.688  -03 14 29.97  22.8i 16QA135   W84  C~55Zc      
2016 09  22.09563  00 06 19.296  -03 22 29.95  22.7r 16QA135   W84  C~55Zc      
2016 09  22.09701  00 06 19.291  -03 22 30.17  23.6g 16QA135   W84  C~55Zc      
2016 11  26.12104  00 02 32.668  -03 51 36.22  22.3i 16QA135   W84  C~55Zc      
2016 11  26.12241  00 02 32.673  -03 51 36.30  23.3r 16QA135   W84  C~55Zd      
2017 08  18.31325  00 14 41.250  -03 08 03.23  22.6r 16QA135   W84  C~55Zd      
2017 08  18.31463  00 14 41.238  -03 08 03.29  22.4i 16QA135   W84  C~55Zd      
2017 10  17.22970  00 10 30.217  -03 43 26.35  22.5i 16QA135   W84  C~55Zd      
2017 10  17.23107  00 10 30.210  -03 43 26.51  22.9r 16QA135   W84  C~55Zd      
2017 10  29.15778  00 09 43.926  -03 49 11.23  22.6z 16QA135   W84  C~55Zd      
2017 12  23.04948  00 08 18.821  -03 59 08.84  21.3Y 16QA135   W84  C~55Zd      
2018 10  18.17681  00 16 24.625  -03 50 08.35  22.7z 16QA135   W84  C~55Zd      
2018 10  18.17817  00 16 24.624  -03 50 08.38  22.9i 16QA135   W84  C~55Zd      
2018 11  07.12755  00 15 10.638  -03 59 00.30  23.6r 16QA135   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     0.10       0.00     0.08
     2   0.0382   -985.83    -0.10    -123.50     0.05
     3   0.0382   -985.80     0.03    -123.58    -0.02
     4   0.0736  -1965.33     0.02    -221.84    -0.02
     5   0.0736  -1965.48    -0.03    -222.01    -0.18
     6   0.2517  -5774.00    -0.03    -476.01     0.10
     7   0.2517  -5773.96     0.04    -476.12    -0.00
     8   0.9777   5275.24     0.04   -2425.73     0.03
     9   0.9777   5275.06    -0.07   -2425.71     0.06
    10   1.1418    979.93     0.03   -2871.00     0.11
    11   1.1418    979.77    -0.03   -2871.11     0.01
    12   1.1744    206.93     0.01   -2910.96    -0.11
    13   1.3247  -1199.49    -0.03   -2951.52    -0.14
    14   2.1437   5684.77    -0.03   -5361.38     0.02
    15   2.1437   5684.74     0.04   -5361.40    -0.00
    16   2.1983   4456.05     0.03   -5405.43     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.

16QA135    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        46.759    46.827    46.692
ecceobj         0.210     0.212     0.207
incobj         27.839    27.840    27.838
qmin           36.228    36.141    36.293
qmax           57.423    57.644    57.190
amean          46.592    46.650    46.512
amin           46.198    46.254    46.112
amax           47.051    47.123    46.986
emean           0.203     0.206     0.201
emin            0.188     0.190     0.186
emax            0.221     0.224     0.217
imean          27.483    27.501    27.482
imin           27.037    27.060    27.052
imax           27.866    27.849    27.853
excite_mean     0.504     0.506     0.503
fracstop        1.000     1.000     1.000
cjmean          2.807     2.806     2.807

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       180.1     179.9     180.5
kozaiamp        179.9     180.0     179.9