Orbit Fit and Astrometric record for 16SY105

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: 16SY105   
# Created Thu Dec  9 02:13:58 2021
# Orbit generated from Bernstein formalism
# Fitting      9 observations of      9
# Arc:   3.16y
# First observation: 2015/09/12
#  Last observation: 2018/11/08
Preliminary a, adot, b, bdot, g, gdot:
   0.000219   0.033848  -0.000011  -0.009526   0.032730   0.000000
# Chi-squared of fit:     6.56 DOF:     12 RMS:  0.15
# Min/Max residuals:    -0.33    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.831644E-05  3.378768E-02 -4.673532E-06 -9.290599E-03  2.951705E-02 -3.682802E-03
# Covariance matrix:
  1.2524E-12 -1.2986E-12 -1.0567E-13  2.5840E-13 -7.3438E-13 -8.6964E-12
 -1.2986E-12  2.6517E-12  2.2362E-13 -7.9824E-13  4.2388E-12  2.1310E-11
 -1.0567E-13  2.2362E-13  8.0991E-13 -4.0011E-13  2.0016E-13  2.0122E-12
  2.5840E-13 -7.9824E-13 -4.0011E-13  4.7144E-13 -1.8861E-12 -6.6654E-12
 -7.3438E-13  4.2388E-12  2.0016E-13 -1.8861E-12  1.6304E-11  3.2618E-11
 -8.6964E-12  2.1310E-11  2.0122E-12 -6.6654E-12  3.2618E-11  1.8577E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -22.535001  -61.209145   -0.773918   -0.248600   -0.599550  2457277.518599
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          345.96615 +/-     0.053
Argument of Peri:      261.96268 +/-     0.090
Long of Asc Node:       65.17698 +/-     0.002
Inclination:            26.38792 +/-     0.000
Eccentricity:         0.25402292 +/-    0.0005
Semi-Major Axis:     45.41634775 +/-    0.0352
Time of Perihelion: 2461628.5392 +/-      15.5
Perihelion:          33.87955440 +/-    0.0359
Aphelion:            56.95314110 +/-    0.0505
Period (y)              306.0741 +/-      0.36
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           16.05840046 +/-    0.0021
Ecliptic Y          -27.62013443 +/-    0.0037
Ecliptic Z          -12.98409444 +/-    0.0018
Ecliptic XDOT         0.00243371 +/-    0.0000
Ecliptic YDOT         0.00206888 +/-    0.0000
Ecliptic ZDOT        -0.00066498 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   34.48667510 +/-    0.0032
Geocenter to KBO     33.87872860 +/-    0.0046
# Hcoef:  8.32

The following table shows the complete astrometric record for 16SY105. 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 (16SY105) followed by the observatory code and reference code for the source of the astrometry.

2015 09  12.01781  20 28 01.100  -42 20 46.89  23.6r 16SY105   W84  C~55a1      
2016 09  23.00046  20 38 04.263  -42 16 29.33  24.0g 16SY105   W84  C~55a1      
2016 09  30.01330  20 37 42.518  -42 13 49.09  24.3g 16SY105   W84  C~55a1      
2017 09  23.03819  20 48 58.483  -42 11 45.02  23.9r 16SY105   W84  C~55a1      
2017 10  11.02207  20 48 09.547  -42 04 04.79  23.8g 16SY105   W84  C~55a1      
2017 10  16.07103  20 48 04.043  -42 01 15.25  24.2r 16SY105   W84  C~55a1      
2017 10  17.08881  20 48 03.395  -42 00 39.42  24.8g 16SY105   W84  C~55a1      
2018 09  15.22634  21 00 31.734  -42 04 51.78  23.7g 16SY105   W84  C~55a1      
2018 11  08.06878  20 59 05.527  -41 37 19.63  23.6r 16SY105   W84  C~55a1      

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    -0.04       0.00    -0.06
     2   1.0321   6508.13    -0.03   -1582.26     0.10
     3   1.0513   6322.66     0.13   -1359.31    -0.11
     4   2.0315  13536.68     0.27   -3516.88    -0.18
     5   2.0808  13164.34    -0.33   -2906.24     0.22
     6   2.0946  13159.57    -0.01   -2725.61     0.21
     7   2.0974  13164.03    -0.00   -2689.26    -0.05
     8   3.0095  20998.86    -0.03   -5719.65     0.08
     9   3.1569  20664.88     0.05   -3824.63    -0.21

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.

16SY105    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        45.528    45.621    45.435
ecceobj         0.258     0.259     0.257
incobj         26.447    26.447    26.448
qmin           33.381    33.327    32.584
qmax           58.618    58.816    59.015
amean          45.673    45.726    45.491
amin           45.196    45.234    45.043
amax           46.304    46.326    46.040
emean           0.244     0.245     0.267
emin            0.223     0.223     0.245
emax            0.269     0.270     0.282
imean          25.492    25.476    24.673
imin           24.698    24.697    24.167
imax           26.135    26.149    25.330
excite_mean     0.495     0.495     0.496
fracstop        1.000     1.000     1.000
cjmean          2.816     2.816     2.815

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       174.6     175.5     179.4
kozaiamp        179.9     180.0     180.0