Orbit Fit and Astrometric record for 15QL34

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: 15QL34    
# Created Sat Dec  4 02:13:28 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     18 observations of     18
# Arc:   5.07y
# First observation: 2013/11/05
#  Last observation: 2018/12/02
# Chi-squared of fit:     2.89 DOF:     30 RMS:  0.07
# Min/Max residuals:    -0.10    0.18
# Exact a, adot, b, bdot, g, gdot:
  1.779702E-05  3.281180E-02 -6.344007E-06 -1.212872E-02  2.875560E-02  4.745414E-03
# Covariance matrix:
  4.7668E-13 -2.2916E-13 -3.0187E-14  4.9543E-14 -1.5553E-13 -8.1570E-13
 -2.2916E-13  3.3023E-13  6.7742E-14 -1.1455E-13 -1.2125E-15  1.9741E-12
 -3.0187E-14  6.7742E-14  3.7274E-13 -1.1478E-13 -4.1331E-15  4.4630E-13
  4.9543E-14 -1.1455E-13 -1.1478E-13  7.2671E-14  1.1334E-14 -7.5753E-13
 -1.5553E-13 -1.2125E-15 -4.1331E-15  1.1334E-14  4.5170E-13 -3.0565E-13
 -8.1570E-13  1.9741E-12  4.4630E-13 -7.5753E-13 -3.0565E-13  1.3128E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
  -17.173999   12.050551   -0.500881   -0.252182   -0.816391  2456601.516448
# Heliocentric elements and errors
Epoch:              2456602.5000  =  2013/11/06
Mean Anomaly:           12.79895 +/-     0.007
Argument of Peri:      190.92355 +/-     0.015
Long of Asc Node:      154.74250 +/-     0.000
Inclination:            25.99724 +/-     0.000
Eccentricity:         0.38271291 +/-    0.0001
Semi-Major Axis:     55.49511121 +/-    0.0122
Time of Perihelion: 2451234.0093 +/-       3.4
Perihelion:          34.25641554 +/-    0.0110
Aphelion:            76.73380687 +/-    0.0187
Period (y)              413.4189 +/-      0.14
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           33.22332788 +/-    0.0008
Ecliptic Y            7.60780693 +/-    0.0002
Ecliptic Z          -10.26866475 +/-    0.0002
Ecliptic XDOT        -0.00056970 +/-    0.0000
Ecliptic YDOT         0.00307246 +/-    0.0000
Ecliptic ZDOT        -0.00123657 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.59644444 +/-    0.0007
Geocenter to KBO     34.77578233 +/-    0.0008
# Hcoef:  7.27

The following table shows the complete astrometric record for 15QL34. 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 (15QL34) followed by the observatory code and reference code for the source of the astrometry.

2013 11  05.01567  01 11 18.27   -11 02 39.1   23.2r 15QL34    W84  C~55We      
2013 11  05.05474  01 11 18.08   -11 02 39.8         15QL34    W84  C~55We      
2013 11  05.14797  01 11 17.65   -11 02 41.6         15QL34    W84  C~55We      
2015 08  23.38675  01 32 48.364  -10 00 05.61  23.1i 15QL34    W84  C~55We      
2015 09  13.26977  01 31 41.777  -10 16 20.73  21.7i 15QL34    W84  C~55We      
2016 10  03.27896  01 38 03.522  -10 23 24.22  22.6r 15QL34    W84  C~55We      
2016 10  03.28033  01 38 03.514  -10 23 24.32  22.2i 15QL34    W84  C~55We      
2016 10  03.28170  01 38 03.520  -10 23 24.34  23.4g 15QL34    W84  C~55We      
2016 11  30.06582  01 33 35.152  -10 44 55.12  24.1g 15QL34    W84  C~55We      
2017 11  18.16864  01 42 09.277  -10 35 25.02  22.8r 15QL34    W84  C~55We      
2017 11  18.17001  01 42 09.276  -10 35 25.06  22.3i 15QL34    W84  C~55We      
2017 11  18.17138  01 42 09.279  -10 35 25.11  23.4g 15QL34    W84  C~55We      
2017 11  27.18466  01 41 32.893  -10 36 24.37  22.7i 15QL34    W84  C~55We      
2017 12  22.12613  01 40 25.033  -10 33 05.97  22.9r 15QL34    W84  C~55We      
2018 10  21.21041  01 52 08.990  -10 15 53.75  21.7z 15QL34    W84  C~55We      
2018 11  15.24108  01 50 05.772  -10 25 35.97  22.5i 15QL34    W84  C~55We      
2018 11  15.24246  01 50 05.765  -10 25 35.94  23.2r 15QL34    W84  C~55We      
2018 12  02.09989  01 48 56.805  -10 27 24.23  24.2g 15QL34    W84  C~55We      

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     0.07       0.00    -0.04
     2   0.0001      0.00    -0.05       0.00     0.02
     3   0.0004      0.00     0.01       0.00     0.01
     4   1.7970      0.00    -0.05       0.00    -0.03
     5   1.8542      0.00    -0.06       0.00     0.15
     6   2.9111      0.00    -0.00       0.00     0.05
     7   2.9111      0.00    -0.02       0.00     0.01
     8   2.9111      0.00     0.17       0.00     0.04
     9   3.0693      0.00    -0.08       0.00    -0.10
    10   4.0360      0.00    -0.03       0.00    -0.02
    11   4.0360      0.00     0.04       0.00    -0.04
    12   4.0360      0.00     0.18       0.00    -0.08
    13   4.0607      0.00     0.01       0.00    -0.08
    14   4.1290      0.00    -0.01       0.00    -0.02
    15   4.9588      0.00    -0.05       0.00    -0.01
    16   5.0273      0.00    -0.01       0.00    -0.02
    17   5.0273      0.00    -0.02       0.00     0.03
    18   5.0735      0.00     0.01       0.00     0.17

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.

15QL34    quality flag:3

Type:         5:2EEE    5:2EEE    5:2EEE
Type:         5:2EII    5:2EII    5:2EII

axisobj        55.989    55.990    55.989
ecceobj         0.389     0.389     0.389
incobj         25.943    25.943    25.943
qmin           33.844    33.844    33.844
qmax           78.106    78.106    78.106
amean          55.461    55.461    55.461
amin           54.805    54.805    54.806
amax           56.271    56.271    56.270
emean           0.323     0.323     0.323
emin            0.226     0.226     0.226
emax            0.390     0.390     0.390
imean          27.484    27.484    27.484
imin           24.802    24.802    24.802
imax           30.638    30.638    30.637
excite_mean     0.566     0.566     0.566
fracstop        1.000     1.000     1.000
cjmean          2.818     2.818     2.818

libcent 0       162.0     162.0     162.1
libamp  0       119.7     119.6     120.0
libcent 1       228.2     228.2     228.5
libamp  1       121.8     121.7     122.0
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       202.4     202.4     202.4
kozaiamp         15.2      15.2      15.3