Orbit Fit and Astrometric record for 13UG18

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: 13UG18    
# Created Fri Mar 29 01:16:12 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     36 observations of     36
# Arc:   6.23y
# First observation: 2013/08/02
#  Last observation: 2019/10/26
# Chi-squared of fit:    22.91 DOF:     66 RMS:  0.14
# Min/Max residuals:    -0.25    0.55
# Exact a, adot, b, bdot, g, gdot:
  1.495576E-05  2.178717E-02 -1.262174E-07  5.620527E-05  2.295620E-02  2.819407E-03
# Covariance matrix:
  1.5703E-13 -6.1150E-14  4.1088E-16 -4.0350E-17  7.9322E-14 -4.5241E-13
 -6.1150E-14  1.7760E-13  1.0701E-16  2.0829E-16  4.7724E-14  1.4826E-12
  4.1088E-16  1.0701E-16  5.9300E-14 -1.9199E-14  5.0038E-16  7.2797E-16
 -4.0350E-17  2.0829E-16 -1.9199E-14  2.0772E-14  7.9738E-17  1.9591E-15
  7.9322E-14  4.7724E-14  5.0038E-16  7.9738E-17  1.1254E-13  3.9173E-13
 -4.5241E-13  1.4826E-12  7.2797E-16  1.9591E-15  3.9173E-13  1.4051E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.931371   18.100921    0.942584   -0.006166   -0.381197  2456507.044298
# Heliocentric elements and errors
Epoch:              2456506.5000  =  2013/08/02
Mean Anomaly:           73.20677 +/-     0.028
Argument of Peri:      192.58407 +/-     0.033
Long of Asc Node:       99.01148 +/-     0.023
Inclination:             0.93178 +/-     0.000
Eccentricity:         0.10659221 +/-    0.0002
Semi-Major Axis:     44.84832601 +/-    0.0038
Time of Perihelion: 2434198.1980 +/-       9.0
Perihelion:          40.06784371 +/-    0.0086
Aphelion:            49.62880831 +/-    0.0089
Period (y)              300.3499 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           42.05491902 +/-    0.0006
Ecliptic Y           12.75796582 +/-    0.0002
Ecliptic Z           -0.70804298 +/-    0.0000
Ecliptic XDOT        -0.00049386 +/-    0.0000
Ecliptic YDOT         0.00257350 +/-    0.0000
Ecliptic ZDOT         0.00000138 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.95312480 +/-    0.0006
Geocenter to KBO     43.56116752 +/-    0.0006
# Hcoef:  7.82

The following table shows the complete astrometric record for 13UG18. 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 (13UG18) followed by the observatory code and reference code for the source of the astrometry.

2013 08  02.54352  01 08 12.174  +06 14 16.30  24.4r 13UG18    568  C~2Rfu      
2013 08  02.58624  01 08 12.126  +06 14 15.86  24.2r 13UG18    568  C~2Rfu      
2013 08  30.47985  01 07 12.258  +06 07 37.90  24.2r 13UG18    568  C~2Rfv      
2013 08  31.46342  01 07 09.214  +06 07 18.16  24.3r 13UG18    568  C~2Rfv      
2013 08  31.52899  01 07 09.014  +06 07 16.92  24.7r 13UG18    568  C~2Rfv      
2013 09  04.44319  01 06 56.320  +06 05 55.57  24.3r 13UG18    568  C~2Rfv      
2013 09  04.51807  01 06 56.066  +06 05 54.48  24.1r 13UG18    568  C~2Rfv      
2013 10  06.42466  01 04 49.551  +05 52 41.27  24.1r 13UG18    568  C~2Rfv      
2013 10  09.55440  01 04 35.943  +05 51 17.09  24.4r 13UG18    568  C~2Rfv      
2013 10  31.26631  01 03 03.930  +05 41 55.44  23.9r 13UG18    568  C~2Rfv      
2013 10  31.30910  01 03 03.757  +05 41 54.44  23.8r 13UG18    568  C~2Rfv      
2013 10  31.35182  01 03 03.583  +05 41 53.31  23.9r 13UG18    568  C~2Rfv      
2013 11  01.29289  01 02 59.826  +05 41 30.69  23.8r 13UG18    568  C~2Rfv      
2013 11  01.42381  01 02 59.313  +05 41 27.52        13UG18    568  C~2Rfv      
2013 11  05.47053  01 02 43.531  +05 39 52.52  24.0r 13UG18    568  C~2Rfv      
2013 11  07.44359  01 02 36.084  +05 39 08.03  24.3r 13UG18    568  C~2Rfv      
2013 11  07.45135  01 02 36.040  +05 39 07.67  24.0r 13UG18    568  C~2Rfv      
2013 11  07.48378  01 02 35.933  +05 39 07.32  23.8r 13UG18    568  C~2Rfv      
2013 12  04.28292  01 01 15.832  +05 31 17.85  24.2r 13UG18    568  C~2Rfv      
2013 12  04.33509  01 01 15.718  +05 31 17.44  24.4r 13UG18    568  C~2Rfv      
2013 12  05.26092  01 01 13.811  +05 31 06.78  24.4r 13UG18    568  C~2Rfv      
2014 06  27.60171  01 12 33.254  +06 41 51.99  24.6r 13UG18    568  C~2Rfv      
2014 06  28.60677  01 12 35.166  +06 42 02.43  24.3r 13UG18    568  C~2Rfv      
2014 07  24.56479  01 12 56.046  +06 43 35.03  24.5r 13UG18    568  C~2Rfv      
2014 07  27.59560  01 12 54.853  +06 43 23.82  24.4r 13UG18    568  C~2Rfv      
2014 08  23.57976  01 12 12.480  +06 38 34.08  24.3r 13UG18    568  C~2Rfv      
2014 08  28.44260  01 11 59.306  +06 37 09.05        13UG18    568  C~2Rfv      
2014 10  23.34848  01 08 19.330  +06 14 26.14  24.1r 13UG18    568  C~2Rfv      
2014 10  27.38719  01 08 02.334  +06 12 43.25  24.3r 13UG18    568  C~2Rfv      
2014 11  19.19777  01 06 36.734  +06 04 14.34  23.8r 13UG18    568  C~2Rfv      
2014 11  19.26507  01 06 36.509  +06 04 12.94  24.3r 13UG18    568  C~2Rfv      
2014 11  25.21441  01 06 18.454  +06 02 27.74  24.5r 13UG18    568  C~2Rfv      
2015 01  18.22533  01 05 39.172  +05 59 39.40  24.0r 13UG18    568  C~2Rfv      
2015 12  07.38190  01 10 27.140  +06 28 18.99  24.4w 13UG18    568  C~2Rfv      
2019 10  26.229840 01 31 23.190  +08 34 04.77  24.5G 13UG18    G37  C~3clS      
2019 10  26.321480 01 31 22.786  +08 34 02.52        13UG18    G37  C~3clS      

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    -0.00       0.00     0.04
     2   0.0001      0.00     0.04       0.00    -0.06
     3   0.0765      0.00    -0.05       0.00     0.15
     4   0.0792      0.00     0.04       0.00     0.02
     5   0.0794      0.00     0.20       0.00     0.10
     6   0.0901      0.00     0.16       0.00     0.04
     7   0.0903      0.00     0.20       0.00     0.55
     8   0.1776      0.00    -0.03       0.00     0.07
     9   0.1862      0.00    -0.12       0.00    -0.25
    10   0.2456      0.00    -0.02       0.00    -0.07
    11   0.2458      0.00     0.00       0.00    -0.03
    12   0.2459      0.00     0.01       0.00    -0.13
    13   0.2485      0.00    -0.08       0.00    -0.08
    14   0.2488      0.00     0.18       0.00    -0.11
    15   0.2599      0.00    -0.01       0.00    -0.24
    16   0.2653      0.00     0.01       0.00    -0.07
    17   0.2653      0.00    -0.21       0.00    -0.25
    18   0.2654      0.00     0.03       0.00     0.13
    19   0.3388      0.00    -0.04       0.00    -0.25
    20   0.3389      0.00    -0.04       0.00    -0.04
    21   0.3415      0.00    -0.02       0.00     0.01
    22   0.9009      0.00    -0.18       0.00    -0.09
    23   0.9037      0.00    -0.19       0.00     0.00
    24   0.9747      0.00    -0.04       0.00     0.06
    25   0.9830      0.00    -0.03       0.00     0.06
    26   1.0569      0.00    -0.24       0.00    -0.01
    27   1.0702      0.00    -0.17       0.00     0.05
    28   1.2233      0.00     0.18       0.00     0.15
    29   1.2343      0.00     0.37       0.00    -0.10
    30   1.2968      0.00     0.08       0.00     0.24
    31   1.2970      0.00     0.02       0.00     0.11
    32   1.3133      0.00     0.03       0.00    -0.13
    33   1.4611      0.00    -0.01       0.00     0.20
    34   2.3459      0.00    -0.11       0.00     0.04
    35   6.2305      0.00     0.04       0.00    -0.06
    36   6.2307      0.00     0.02       0.00    -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.

13UG18    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.107    45.107    45.107
ecceobj         0.110     0.110     0.110
incobj          0.932     0.932     0.932
qmin           39.346    39.358    39.385
qmax           50.529    50.554    50.664
amean          44.831    44.832    44.832
amin           44.465    44.461    44.470
amax           45.221    45.225    45.248
emean           0.104     0.104     0.104
emin            0.089     0.089     0.089
emax            0.118     0.119     0.120
imean           1.120     1.121     1.121
imin            0.389     0.390     0.390
imax            1.668     1.672     1.668
excite_mean     0.106     0.106     0.106
fracstop        1.000     1.000     1.000
cjmean          3.098     3.098     3.098

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       173.7     173.7     173.5
kozaiamp        179.9     179.9     179.9