Orbit Fit and Astrometric record for 13UL49

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: 13UL49    
# Created Tue Apr  1 01:09:52 2025
# Orbit generated from Bernstein formalism
# Fitting     17 observations of     17
# Arc:   5.00y
# First observation: 2013/10/28
#  Last observation: 2018/10/28
Preliminary a, adot, b, bdot, g, gdot:
   0.000010   0.021068   0.000002  -0.004661   0.023551   0.000000
# Chi-squared of fit:     3.45 DOF:     28 RMS:  0.08
# Min/Max residuals:    -0.21    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.436991E-05  2.104487E-02 -2.792142E-06 -4.645210E-03  2.299849E-02  3.105922E-04
# Covariance matrix:
  6.2609E-13 -3.4246E-13 -2.8667E-14  4.7023E-14 -1.2450E-13 -2.0686E-12
 -3.4246E-13  4.3375E-13  5.1065E-14 -8.4033E-14  1.1704E-13  3.7040E-12
 -2.8667E-14  5.1065E-14  5.0827E-13 -1.3651E-13  2.2437E-14  4.8257E-13
  4.7023E-14 -8.4033E-14 -1.3651E-13  5.5918E-14 -3.5303E-14 -7.9308E-13
 -1.2450E-13  1.1704E-13  2.2437E-14 -3.5303E-14  6.8195E-13  1.5126E-12
 -2.0686E-12  3.7040E-12  4.8257E-13 -7.9308E-13  1.5126E-12  3.4929E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.360441   -2.974725   -0.603207    0.046332   -0.787121  2456593.540348
# Heliocentric elements and errors
Epoch:              2456590.5000  =  2013/10/25
Mean Anomaly:          121.42408 +/-     0.364
Argument of Peri:       40.71279 +/-     0.356
Long of Asc Node:      192.37522 +/-     0.000
Inclination:            12.91515 +/-     0.001
Eccentricity:         0.03054945 +/-    0.0002
Semi-Major Axis:     43.54898150 +/-    0.0061
Time of Perihelion: 2421185.2438 +/-     105.9
Perihelion:          42.21858409 +/-    0.0112
Aphelion:            44.87937890 +/-    0.0114
Period (y)              287.3924 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           44.16603188 +/-    0.0016
Ecliptic Y           -1.68808645 +/-    0.0001
Ecliptic Z            2.54858756 +/-    0.0001
Ecliptic XDOT         0.00019307 +/-    0.0000
Ecliptic YDOT         0.00249672 +/-    0.0000
Ecliptic ZDOT        -0.00054973 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.27169870 +/-    0.0016
Geocenter to KBO     43.48110842 +/-    0.0016
# Hcoef:  6.70

The following table shows the complete astrometric record for 13UL49. 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 (13UL49) followed by the observatory code and reference code for the source of the astrometry.

2013 10  28.03957  23 43 44.418  +01 54 03.65  22.8i 13UL49    W84  C~52Rk      
2013 11  22.05198  23 42 48.271  +01 45 07.95  24.0g 13UL49    W84  C~52Rk      
2014 10  14.21806  23 49 23.972  +02 14 38.59  22.4z 13UL49    W84  C~52Rk      
2016 09  22.12724  00 00 34.191  +02 53 20.63  24.0g 13UL49    W84  C~52Rk      
2016 10  02.16510  23 59 52.218  +02 48 15.60  23.0r 13UL49    W84  C~52Rk      
2016 10  02.16649  23 59 52.219  +02 48 15.61  23.6g 13UL49    W84  C~52Rk      
2017 08  28.25658  00 07 05.606  +03 18 48.85  23.2r 13UL49    W84  C~52Rk      
2017 08  28.25795  00 07 05.607  +03 18 48.73  23.1i 13UL49    W84  C~52Rk      
2017 09  27.18416  00 05 05.040  +03 04 40.78  22.2i 13UL49    W84  C~52Rk      
2017 09  27.18554  00 05 05.026  +03 04 40.81  23.0r 13UL49    W84  C~52Rk      
2017 10  29.15084  00 03 01.463  +02 49 08.37  22.5z 13UL49    W84  C~52Rk      
2017 10  29.15498  00 03 01.445  +02 49 08.27  22.6i 13UL49    W84  C~52Rk      
2017 11  08.07280  00 02 31.607  +02 45 03.01  22.9r 13UL49    W84  C~52Rk      
2017 11  08.07418  00 02 31.602  +02 45 03.03  24.5g 13UL49    W84  C~52Rk      
2018 09  09.25802  00 11 11.231  +03 27 15.26  24.5g 13UL49    W84  C~52Rk      
2018 10  18.15858  00 08 31.856  +03 08 01.52  22.6z 13UL49    W84  C~52Rk      
2018 10  28.17245  00 07 55.544  +03 03 22.16  22.7i 13UL49    W84  C~52Rk      

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     0.02       0.00    -0.08
     2   0.0685   -985.37    -0.01    -156.93     0.23
     3   0.9615   5162.99    -0.03    -887.80    -0.21
     4   2.9024  15333.21     0.17   -2734.18     0.11
     5   2.9298  14631.32    -0.04   -2765.98     0.01
     6   2.9298  14631.33     0.07   -2765.98     0.01
     7   3.8336  21372.97    -0.07   -3647.01     0.09
     8   3.8336  21372.94    -0.01   -3647.13    -0.02
     9   3.9155  19359.54    -0.01   -3714.79    -0.09
    10   3.9155  19359.36    -0.09   -3714.68     0.02
    11   4.0030  17274.14    -0.01   -3841.24    -0.07
    12   4.0031  17273.85    -0.06   -3841.22    -0.04
    13   4.0302  16762.82    -0.03   -3890.11    -0.03
    14   4.0302  16762.75    -0.02   -3890.06     0.03
    15   4.8658  25001.44     0.03   -4636.49    -0.00
    16   4.9723  22318.02    -0.03   -4757.68     0.01
    17   4.9997  21701.05     0.12   -4800.21     0.05

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.

13UL49    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.791    43.810    43.773
ecceobj         0.029     0.029     0.029
incobj         12.879    12.879    12.879
qmin           41.682    41.675    41.637
qmax           45.769    45.757    45.735
amean          43.623    43.642    43.604
amin           43.289    43.306    43.268
amax           43.972    43.975    43.950
emean           0.029     0.029     0.029
emin            0.016     0.017     0.016
emax            0.041     0.041     0.041
imean          13.291    13.290    13.292
imin           12.821    12.808    12.812
imax           13.744    13.735    13.744
excite_mean     0.232     0.232     0.232
fracstop        1.000     1.000     1.000
cjmean          3.032     3.032     3.031

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       182.3     181.4     182.8
kozaiamp        179.9     180.0     180.0