Orbit Fit and Astrometric record for 15QA34

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: 15QA34    
# Created Fri Dec  3 02:13:26 2021
# Orbit generated from Bernstein formalism
# Fitting     17 observations of     17
# Arc:   2.39y
# First observation: 2015/08/18
#  Last observation: 2018/01/09
Preliminary a, adot, b, bdot, g, gdot:
   0.000066   0.035452   0.000043   0.005504   0.028663   0.000000
# Chi-squared of fit:     7.36 DOF:     28 RMS:  0.12
# Min/Max residuals:    -0.29    0.25
# Exact a, adot, b, bdot, g, gdot:
  1.926128E-05  3.511814E-02  2.860032E-06  5.508041E-03  2.829085E-02 -3.348148E-03
# Covariance matrix:
  3.3772E-13 -5.2794E-13  7.3773E-15 -6.5912E-14 -2.7668E-13 -5.0797E-12
 -5.2794E-13  2.4403E-12 -4.9458E-14  4.0670E-13  1.6579E-12  3.1185E-11
  7.3773E-15 -4.9458E-14  2.8121E-13 -1.6067E-13 -6.6065E-15 -1.0477E-12
 -6.5912E-14  4.0670E-13 -1.6067E-13  1.9125E-13  2.5129E-13  5.9575E-12
 -2.7668E-13  1.6579E-12 -6.6065E-15  2.5129E-13  1.3246E-12  2.0234E-11
 -5.0797E-12  3.1185E-11 -1.0477E-12  5.9575E-12  2.0234E-11  4.4379E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -23.801506   20.545763    0.836364   -0.231896   -0.526153  2457252.882409
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:          352.70647 +/-     0.032
Argument of Peri:      310.16400 +/-     0.101
Long of Asc Node:       88.76235 +/-     0.001
Inclination:            24.80008 +/-     0.000
Eccentricity:         0.45565975 +/-    0.0003
Semi-Major Axis:     64.47002147 +/-    0.0257
Time of Perihelion: 2461081.1309 +/-      16.9
Perihelion:          35.09362792 +/-    0.0243
Aphelion:            93.84641501 +/-    0.0424
Period (y)              517.6604 +/-      0.31
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           31.11188858 +/-    0.0012
Ecliptic Y           10.76896111 +/-    0.0005
Ecliptic Z          -14.26493202 +/-    0.0006
Ecliptic XDOT        -0.00127092 +/-    0.0000
Ecliptic YDOT         0.00314748 +/-    0.0000
Ecliptic ZDOT         0.00061852 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.88047408 +/-    0.0011
Geocenter to KBO     35.34711718 +/-    0.0014
# Hcoef:  8.14

The following table shows the complete astrometric record for 15QA34. 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 (15QA34) followed by the observatory code and reference code for the source of the astrometry.

2015 08  18.38162  01 51 54.960  -14 02 11.17  24.4g 15QA34    W84  C~55Wd      
2015 08  18.38435  01 51 54.957  -14 02 11.16  24.4g 15QA34    W84  C~55Wd      
2015 08  23.39502  01 51 45.829  -14 05 42.35  24.2r 15QA34    W84  C~55Wd      
2015 09  04.34300  01 51 14.581  -14 14 14.98  23.3z 15QA34    W84  C~55Wd      
2016 09  07.36205  01 58 14.021  -13 12 19.13  23.4r 15QA34    W84  C~55Wd      
2016 09  07.36344  01 58 14.026  -13 12 19.34  23.3i 15QA34    W84  C~55Wd      
2016 09  07.36482  01 58 14.016  -13 12 19.44  24.5g 15QA34    W84  C~55Wd      
2016 09  30.23645  01 56 39.370  -13 27 24.96  22.7i 15QA34    W84  C~55Wd      
2016 09  30.23783  01 56 39.367  -13 27 24.99  23.5r 15QA34    W84  C~55Wd      
2016 09  30.23921  01 56 39.349  -13 27 25.20  24.0g 15QA34    W84  C~55Wd      
2017 08  21.34900  02 06 06.043  -11 54 41.34  24.3r 15QA34    W84  C~55Wd      
2017 08  21.35038  02 06 06.005  -11 54 41.53  23.4g 15QA34    W84  C~55Wd      
2017 11  18.18244  01 59 39.373  -12 38 00.24  23.4r 15QA34    W84  C~55Wd      
2017 11  24.16406  01 59 11.378  -12 37 47.91  24.1g 15QA34    W84  C~55Wd      
2017 12  22.14128  01 57 34.539  -12 29 29.67  24.5r 15QA34    W84  C~55Wd      
2018 01  09.09194  01 57 11.566  -12 18 17.24  23.8r 15QA34    W84  C~55Wd      
2018 01  09.09332  01 57 11.558  -12 18 17.17  23.4i 15QA34    W84  C~55Wd      

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     0.08       0.00     0.05
     2   0.0000     -0.04     0.14       0.03     0.15
     3   0.0137   -203.74     0.01    -144.00    -0.03
     4   0.0464   -820.07    -0.16    -443.13    -0.16
     5   1.0568   6255.18     0.03     620.78     0.09
     6   1.0568   6255.17     0.10     620.56    -0.11
     7   1.0568   6255.00     0.01     620.52    -0.12
     8   1.1194   4628.90    -0.06     323.90     0.05
     9   1.1194   4628.85     0.00     323.89     0.04
    10   1.1194   4628.53    -0.21     323.80    -0.04
    11   2.0095  14463.28     0.25    2187.99     0.10
    12   2.0095  14462.69    -0.29    2188.04     0.18
    13   2.2527   8210.63    -0.03    2030.01     0.08
    14   2.2691   7837.75     0.15    2201.61    -0.13
    15   2.3457   6725.18     0.02    3213.80    -0.14
    16   2.3948   6676.84     0.03    3964.80    -0.04
    17   2.3948   6676.76    -0.06    3964.91     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.

15QA34    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        65.712    65.751    65.674
ecceobj         0.465     0.466     0.465
incobj         24.805    24.805    24.805
qmin           34.397    34.481    33.640
qmax           97.237    96.946    97.702
amean          64.928    64.928    64.910
amin           64.059    64.120    64.021
amax           66.107    66.025    66.152
emean           0.458     0.459     0.459
emin            0.448     0.449     0.441
emax            0.471     0.469     0.481
imean          23.339    23.265    23.218
imin           22.984    22.997    22.005
imax           23.630    23.492    24.185
excite_mean     0.605     0.605     0.605
fracstop        1.000     1.000     1.000
cjmean          2.862     2.862     2.862

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       172.1     164.1     172.1
kozaiamp        179.9     180.0     180.0