Orbit Fit and Astrometric record for 15QB34

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: 15QB34    
# Created Sat Dec  4 02:13:28 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     25 observations of     25
# Arc:   6.23y
# First observation: 2015/08/18
#  Last observation: 2021/11/11
# Chi-squared of fit:     3.50 DOF:     44 RMS:  0.07
# Min/Max residuals:    -0.23    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.839481E-05  3.396061E-02  2.593353E-06  4.576360E-03  2.944365E-02 -5.164974E-03
# Covariance matrix:
  2.6550E-13 -4.6187E-14  1.3072E-14 -4.7860E-15  1.4819E-13 -1.8475E-13
 -4.6187E-14  1.9738E-13 -9.2301E-15  2.4017E-14  1.9506E-13  8.7171E-13
  1.3072E-14 -9.2301E-15  1.3014E-13 -3.4871E-14  4.8894E-15 -5.5480E-14
 -4.7860E-15  2.4017E-14 -3.4871E-14  1.8659E-14  2.2064E-14  1.1786E-13
  1.4819E-13  1.9506E-13  4.8894E-15  2.2064E-14  4.0183E-13  7.8767E-13
 -1.8475E-13  8.7171E-13 -5.5480E-14  1.1786E-13  7.8767E-13  4.2879E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
  -17.839230   18.710568    0.817264   -0.184203   -0.572929  2457252.907119
# Heliocentric elements and errors
Epoch:              2457252.5000  =  2015/08/18
Mean Anomaly:          330.64881 +/-     0.007
Argument of Peri:      341.99306 +/-     0.011
Long of Asc Node:       84.20842 +/-     0.001
Inclination:            18.95058 +/-     0.000
Eccentricity:         0.26840574 +/-    0.0001
Semi-Major Axis:     43.64152959 +/-    0.0048
Time of Perihelion: 2465838.1185 +/-      16.0
Perihelion:          31.92789241 +/-    0.0049
Aphelion:            55.35516676 +/-    0.0070
Period (y)              288.3090 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           31.45007580 +/-    0.0007
Ecliptic Y            9.79021672 +/-    0.0002
Ecliptic Z          -10.40445285 +/-    0.0002
Ecliptic XDOT        -0.00132456 +/-    0.0000
Ecliptic YDOT         0.00287977 +/-    0.0000
Ecliptic ZDOT         0.00055226 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   34.54295523 +/-    0.0006
Geocenter to KBO     33.96330325 +/-    0.0007
# Hcoef:  7.35

The following table shows the complete astrometric record for 15QB34. 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 (15QB34) followed by the observatory code and reference code for the source of the astrometry.

2015 08  18.40633  01 36 07.642  -09 11 01.48  23.4r 15QB34    W84  C~55Wd      
2015 08  18.40770  01 36 07.648  -09 11 01.47  23.2g 15QB34    W84  C~55Wd      
2015 08  23.38539  01 35 56.048  -09 14 10.40  22.9r 15QB34    W84  C~55Wd      
2015 09  13.26837  01 34 43.673  -09 27 57.25  23.5g 15QB34    W84  C~55Wd      
2015 09  13.26977  01 34 43.671  -09 27 57.30  22.3i 15QB34    W84  C~55Wd      
2015 11  16.20888  01 29 13.159  -09 56 00.44  23.5g 15QB34    W84  C~55Wd      
2016 10  03.27484  01 40 01.102  -08 40 59.93  22.2i 15QB34    W84  C~55Wd      
2016 10  03.27622  01 40 01.096  -08 41 00.03  22.4r 15QB34    W84  C~55Wd      
2016 10  03.27759  01 40 01.093  -08 41 00.05  23.2g 15QB34    W84  C~55Wd      
2016 11  04.16264  01 37 06.460  -08 54 43.64  22.3i 15QB34    W84  C~55Wd      
2016 11  19.10082  01 35 52.108  -08 57 03.26  22.8r 15QB34    W84  C~55Wd      
2016 11  19.10449  01 35 52.103  -08 57 03.31  23.3g 15QB34    W84  C~55Wd      
2016 12  05.05270  01 34 48.268  -08 56 03.45  22.2z 15QB34    W84  C~55Wd      
2017 11  09.19010  01 43 41.052  -07 55 11.70  22.4i 15QB34    W84  C~55Wd      
2017 11  16.12068  01 43 05.890  -07 56 21.31  23.7g 15QB34    W84  C~55Wd      
2017 11  18.11962  01 42 56.198  -07 56 34.11  22.5r 15QB34    W84  C~55Wd      
2017 11  23.10111  01 42 33.100  -07 56 51.43  22.5z 15QB34    W84  C~55Wd      
2018 09  09.36566  01 55 55.715  -06 22 42.51  22.3z 15QB34    W84  C~55Wd      
2018 10  20.27310  01 52 35.454  -06 46 21.55  22.2z 15QB34    W84  C~55Wd      
2018 11  15.09127  01 50 14.145  -06 54 30.09  22.3i 15QB34    W84  C~55Wd      
2018 12  01.05684  01 49 00.419  -06 55 17.19  22.6r 15QB34    W84  C~55Wd      
2018 12  01.05822  01 49 00.412  -06 55 17.20  22.9g 15QB34    W84  C~55Wd      
2021 11  11.352917 02 12 00.330  -03 41 59.04  22.9w 15QB34    F51  C~5BZ6      
2021 11  11.378402 02 12 00.179  -03 41 59.65  22.7w 15QB34    F51  C~5BZ6      
2021 11  11.391144 02 12 00.114  -03 42 00.08  22.6w 15QB34    F51  C~5BZ6      

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    -0.04
     2   0.0000      0.00     0.12       0.00     0.02
     3   0.0136      0.00    -0.02       0.00     0.01
     4   0.0708      0.00    -0.08       0.00     0.00
     5   0.0708      0.00    -0.02       0.00     0.01
     6   0.2459      0.00     0.06       0.00    -0.07
     7   1.1276      0.00    -0.03       0.00     0.01
     8   1.1276      0.00    -0.01       0.00    -0.05
     9   1.1276      0.00     0.06       0.00    -0.02
    10   1.2149      0.00    -0.04       0.00     0.04
    11   1.2558      0.00    -0.07       0.00     0.09
    12   1.2558      0.00     0.11       0.00     0.05
    13   1.2995      0.00     0.02       0.00     0.09
    14   2.2280      0.00     0.09       0.00    -0.01
    15   2.2470      0.00    -0.04       0.00     0.00
    16   2.2525      0.00    -0.06       0.00     0.01
    17   2.2661      0.00    -0.00       0.00    -0.01
    18   3.0608      0.00     0.03       0.00     0.01
    19   3.1728      0.00     0.08       0.00    -0.07
    20   3.2435      0.00     0.00       0.00    -0.01
    21   3.2872      0.00    -0.00       0.00    -0.00
    22   3.2872      0.00    -0.02       0.00    -0.02
    23   6.2339      0.00     0.03       0.00     0.23
    24   6.2340      0.00    -0.08       0.00     0.01
    25   6.2340      0.00     0.02       0.00    -0.23

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.

15QB34    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        44.155    44.155    44.155
ecceobj         0.274     0.274     0.274
incobj         18.952    18.952    18.952
qmin           31.553    30.772    31.553
qmax           56.549    57.325    56.548
amean          43.725    43.725    43.725
amin           43.257    43.275    43.276
amax           44.289    44.259    44.252
emean           0.224     0.234     0.224
emin            0.148     0.149     0.140
emax            0.278     0.296     0.278
imean          19.053    18.638    19.053
imin           17.083    16.298    17.085
imax           21.679    21.641    21.651
excite_mean     0.398     0.399     0.398
fracstop        1.000     1.000     1.000
cjmean          2.907     2.906     2.906

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       185.8     165.9     181.2
kozaiamp        179.9     179.9     180.0