Orbit Fit and Astrometric record for 16UL273

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: 16UL273   
# Created Thu Dec  9 02:13:59 2021
# Orbit generated from Bernstein formalism
# Fitting      9 observations of      9
# Arc:   3.75y
# First observation: 2013/12/20
#  Last observation: 2017/09/18
Preliminary a, adot, b, bdot, g, gdot:
  -0.000262   0.028176  -0.000014   0.011375   0.028210   0.000000
# Chi-squared of fit:     1.69 DOF:     12 RMS:  0.08
# Min/Max residuals:    -0.13    0.16
# Exact a, adot, b, bdot, g, gdot:
  1.610230E-05  2.762041E-02  6.163730E-06  1.114729E-02  2.738607E-02 -1.863705E-03
# Covariance matrix:
  1.4234E-12 -8.8730E-13  5.3143E-14 -2.1462E-13 -7.3837E-13 -5.5110E-12
 -8.8730E-13  1.0714E-12 -1.0407E-13  3.2104E-13  5.5438E-13  8.3875E-12
  5.3143E-14 -1.0407E-13  9.0982E-13 -3.3624E-13 -3.4147E-14 -8.9818E-13
 -2.1462E-13  3.2104E-13 -3.3624E-13  2.3367E-13  2.2736E-13  2.8735E-12
 -7.3837E-13  5.5438E-13 -3.4147E-14  2.2736E-13  1.2779E-12  5.7085E-12
 -5.5110E-12  8.3875E-12 -8.9818E-13  2.8735E-12  5.7085E-12  7.4879E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
  -11.503478   26.016982   -0.867601   -0.091400   -0.449868  2456646.628978
# Heliocentric elements and errors
Epoch:              2456640.5000  =  2013/12/14
Mean Anomaly:          342.12099 +/-     0.109
Argument of Peri:      354.77932 +/-     0.141
Long of Asc Node:       53.14801 +/-     0.001
Inclination:            24.81055 +/-     0.001
Eccentricity:         0.12013619 +/-    0.0002
Semi-Major Axis:     41.67264388 +/-    0.0077
Time of Perihelion: 2461520.4581 +/-      29.6
Perihelion:          36.66625118 +/-    0.0102
Aphelion:            46.67903659 +/-    0.0115
Period (y)              269.0201 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           32.18632554 +/-    0.0013
Ecliptic Y           16.67896996 +/-    0.0007
Ecliptic Z           -7.28191450 +/-    0.0003
Ecliptic XDOT        -0.00118165 +/-    0.0000
Ecliptic YDOT         0.00249667 +/-    0.0000
Ecliptic ZDOT         0.00112933 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.97531433 +/-    0.0012
Geocenter to KBO     36.51491228 +/-    0.0015
# Hcoef:  8.04

The following table shows the complete astrometric record for 16UL273. 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 (16UL273) followed by the observatory code and reference code for the source of the astrometry.

2013 12  20.12820  01 53 06.247  -00 41 14.40  23.3i 16UL273   W84  C~52ag      
2014 10  01.34562  02 04 18.509  +00 45 31.67  23.6r 16UL273   W84  C~52ag      
2016 10  29.20198  02 12 02.352  +02 55 59.47  23.5i 16UL273   W84  C~52ag      
2016 10  29.20336  02 12 02.351  +02 55 59.40  23.4r 16UL273   W84  C~52ag      
2016 11  03.22984  02 11 35.125  +02 54 20.59  24.4r 16UL273   W84  C~52ag      
2016 11  27.12462  02 09 34.290  +02 48 57.11  23.7r 16UL273   W84  C~52ag      
2016 11  27.12599  02 09 34.287  +02 48 57.25  23.6i 16UL273   W84  C~52ag      
2016 11  28.12309  02 09 29.793  +02 48 50.05  23.7g 16UL273   W84  C~52ag      
2017 09  18.31069  02 20 30.425  +04 22 57.48  23.5r 16UL273   W84  C~52ag      

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    -0.03       0.00     0.06
     2   0.7809  11289.93     0.04    1257.47    -0.01
     3   2.8585  20641.39    -0.04    6112.23    -0.02
     4   2.8585  20641.35     0.04    6112.17    -0.09
     5   2.8723  20220.84    -0.11    6164.72     0.07
     6   2.9377  18397.86    -0.08    6506.38    -0.13
     7   2.9377  18397.87     0.02    6506.53    -0.00
     8   2.9404  18331.87     0.15    6523.78    -0.04
     9   3.7459  29749.10    -0.01    8328.86     0.16

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.

16UL273    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        41.920    41.942    41.898
ecceobj         0.124     0.124     0.124
incobj         24.787    24.787    24.787
qmin           35.333    35.557    35.442
qmax           48.152    48.057    48.114
amean          41.620    41.670    41.635
amin           41.250    41.321    41.256
amax           42.029    42.054    42.009
emean           0.127     0.126     0.127
emin            0.108     0.111     0.108
emax            0.147     0.144     0.146
imean          23.465    23.508    23.471
imin           22.915    22.971    22.896
imax           24.086    24.079    24.081
excite_mean     0.418     0.418     0.418
fracstop        1.000     1.000     1.000
cjmean          2.864     2.864     2.864

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       169.5     173.1     170.2
kozaiamp        180.0     179.9     180.0