Orbit Fit and Astrometric record for 16GA277

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: 16GA277   
# Created Sat Dec  4 02:13:49 2021
# Orbit generated from Bernstein formalism
# Fitting     12 observations of     13
# Arc:   1.92y
# First observation: 2016/04/10
#  Last observation: 2018/03/12
Preliminary a, adot, b, bdot, g, gdot:
  -0.000097   0.014314   0.000001  -0.000169   0.016841   0.000000
# Chi-squared of fit:     3.33 DOF:     18 RMS:  0.09
# Min/Max residuals:    -0.19    0.17
# Exact a, adot, b, bdot, g, gdot:
  1.042915E-05  1.398190E-02 -1.971007E-06 -1.579797E-04  1.682683E-02 -1.013639E-02
# Covariance matrix:
  5.3688E-13 -7.0520E-13  1.5574E-15  1.8831E-14  1.9135E-13 -1.0336E-11
 -7.0520E-13  2.1308E-12  1.0394E-14 -6.8373E-14  1.0525E-13  5.1509E-11
  1.5574E-15  1.0394E-14  3.9821E-13 -2.4319E-13  3.2014E-14  5.8014E-13
  1.8831E-14 -6.8373E-14 -2.4319E-13  2.1572E-13  1.4494E-14 -1.6619E-12
  1.9135E-13  1.0525E-13  3.2014E-14  1.4494E-14  1.6834E-12  1.8884E-11
 -1.0336E-11  5.1509E-11  5.8014E-13 -1.6619E-12  1.8884E-11  1.5372E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   19.721677 -154.507130    0.084677    0.335607   -0.935800  2457488.834199
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          349.55397 +/-     0.174
Argument of Peri:      178.01102 +/-     0.035
Long of Asc Node:      112.78158 +/-     0.006
Inclination:            19.42068 +/-     0.000
Eccentricity:         0.76941170 +/-    0.0029
Semi-Major Axis:    156.82928742 +/-    1.7351
Time of Perihelion: 2478296.0457 +/-      36.5
Perihelion:          36.16299944 +/-    0.6112
Aphelion:           277.49557541 +/-    3.1046
Period (y)             1964.0338 +/-     32.59
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -51.43363895 +/-    0.0039
Ecliptic Y          -24.43191143 +/-    0.0018
Ecliptic Z           20.05427991 +/-    0.0015
Ecliptic XDOT         0.00237286 +/-    0.0000
Ecliptic YDOT        -0.00139598 +/-    0.0000
Ecliptic ZDOT        -0.00058074 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   60.36979090 +/-    0.0034
Geocenter to KBO     59.42888295 +/-    0.0046
# Hcoef:  7.55

The following table shows the complete astrometric record for 16GA277. 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 (16GA277) followed by the observatory code and reference code for the source of the astrometry.

2016 04  10.33341  14 03 05.221  +08 32 12.58  25.3r 16GA277   568  C~3wqc      
2016 04  10.59004  14 03 04.340  +08 32 17.78  25.4r 16GA277   568  C~3wqc      
2016 05  03.18759  14 01 51.066  +08 38 31.91        16GA277   304  C~3wqc      
2016 05  03.23875  14 01 50.903  +08 38 32.27        16GA277   304  C~3wqc      
2017 03  01.30959  14 07 52.331  +07 57 38.95        16GA277   304  C~3wqc      
2017 03  01.35365  14 07 52.252  +07 57 40.10        16GA277   304  C~3wqc      
2017 04  26.17271  14 05 16.858  +08 18 41.37  25.2r 16GA277   304  C~3wqc      
2017 04  26.21694  14 05 16.721  +08 18 41.88  25.1r 16GA277   304  C~3wqc      
2018 03  11.33560  14 10 39.064  +07 43 03.35        16GA277   304  C~3wqc      
2018 03  11.34355  14 10 39.054  +07 43 03.51  25.2r 16GA277   304  C~3wqc      
2018 03  11.38262  14 10 38.953  +07 43 04.70        16GA277   304  C~3wqc      
2018 03  12.35140  14 10 36.804  +07 43 29.65        16GA277   304  C~3wqc      
2018 03  12.37969  14 10 36.746  +07 43 30.26        16GA277   304  C~3wqc      

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 (   0.56)      0.00 (   0.38)
     2   0.0007    -14.06    -0.13       0.10     0.07
     3   0.0626  -1162.55    -0.02     -45.41     0.03
     4   0.0627  -1164.93     0.13     -45.95    -0.19
     5   0.8897   4725.52     0.03    -377.59    -0.02
     6   0.8899   4724.01     0.02    -376.95    -0.01
     7   1.0427   2114.60    -0.12     -45.20     0.17
     8   1.0428   2112.52     0.10     -45.46     0.07
     9   1.9165   7353.93    -0.05    -283.84    -0.08
    10   1.9165   7353.73     0.07    -283.74    -0.08
    11   1.9166   7351.89    -0.17    -283.19     0.02
    12   1.9193   7312.97    -0.00    -271.71     0.05
    13   1.9194   7311.94     0.14    -271.46    -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.

16GA277    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj       151.420   156.239   146.938
ecceobj         0.764     0.772     0.756
incobj         19.420    19.421    19.420
qmin           34.368    33.845    33.764
qmax          288.847   310.841   283.402
amean         152.629   163.509   148.731
amin          146.978   156.239   141.096
amax          162.411   173.164   159.455
emean           0.765     0.783     0.761
emin            0.753     0.767     0.740
emax            0.779     0.796     0.777
imean          17.458    16.986    16.340
imin           16.948    16.327    15.259
imax           18.134    18.145    18.133
excite_mean     0.822     0.836     0.811
fracstop        1.000     1.000     1.000
cjmean          2.962     2.957     2.969

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       216.8     219.1     247.6
kozaiamp         30.6      31.9      68.9