Orbit Fit and Astrometric record for 15QC34

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: 15QC34    
# Created Sat Nov 27 02:13:33 2021
# Orbit generated from Bernstein formalism
# Fitting     11 observations of     11
# Arc:   3.28y
# First observation: 2015/08/19
#  Last observation: 2018/12/01
Preliminary a, adot, b, bdot, g, gdot:
  -0.000108   0.029754  -0.000033   0.006348   0.026712   0.000000
# Chi-squared of fit:     1.71 DOF:     16 RMS:  0.07
# Min/Max residuals:    -0.14    0.13
# Exact a, adot, b, bdot, g, gdot:
  1.783698E-05  2.900496E-02  3.338555E-06  6.181563E-03  2.617723E-02 -5.830243E-03
# Covariance matrix:
  6.9356E-13 -3.7149E-13  4.7677E-14 -6.6005E-14  1.2935E-13 -3.5315E-12
 -3.7149E-13  1.2216E-12 -5.7168E-14  2.5798E-13  8.6996E-13  1.3582E-11
  4.7677E-14 -5.7168E-14  5.8309E-13 -2.4040E-13  4.8848E-14 -1.3067E-12
 -6.6005E-14  2.5798E-13 -2.4040E-13  1.7479E-13  1.3063E-13  3.6042E-12
  1.2935E-13  8.6996E-13  4.8848E-14  1.3063E-13  1.2689E-12  6.7448E-12
 -3.5315E-12  1.3582E-11 -1.3067E-12  3.6042E-12  6.7448E-12  1.9062E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -18.905343   26.276017    0.881245   -0.162881   -0.476107  2457253.870989
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:          337.62956 +/-     0.026
Argument of Peri:      349.46107 +/-     0.066
Long of Asc Node:       82.01823 +/-     0.001
Inclination:            21.90692 +/-     0.000
Eccentricity:         0.36597137 +/-    0.0004
Semi-Major Axis:     55.49741960 +/-    0.0219
Time of Perihelion: 2466634.3191 +/-       9.2
Perihelion:          35.18695270 +/-    0.0272
Aphelion:            75.80788649 +/-    0.0379
Period (y)              413.4447 +/-      0.24
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           33.24359491 +/-    0.0014
Ecliptic Y           15.43189842 +/-    0.0007
Ecliptic Z          -12.37727798 +/-    0.0005
Ecliptic XDOT        -0.00167441 +/-    0.0000
Ecliptic YDOT         0.00255113 +/-    0.0000
Ecliptic ZDOT         0.00080927 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.68432631 +/-    0.0012
Geocenter to KBO     38.20114608 +/-    0.0016
# Hcoef:  7.85

The following table shows the complete astrometric record for 15QC34. 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 (15QC34) followed by the observatory code and reference code for the source of the astrometry.

2015 08  19.37020  02 04 40.736  -07 30 30.84  24.1r 15QC34    W84  C~55Wd      
2015 10  17.20063  02 01 13.610  -08 02 13.01  23.6r 15QC34    W84  C~55Wd      
2016 09  10.40608  02 09 35.518  -06 46 53.16  23.7i 15QC34    W84  C~55Wd      
2017 09  18.39055  02 15 00.202  -05 53 51.18  23.4i 15QC34    W84  C~55Wd      
2017 10  22.22156  02 12 27.860  -06 10 34.01  24.1r 15QC34    W84  C~55Wd      
2017 11  23.12060  02 09 50.725  -06 18 05.95  22.8i 15QC34    W84  C~55Wd      
2017 11  23.12198  02 09 50.711  -06 18 06.16  23.4r 15QC34    W84  C~55Wd      
2017 11  23.12336  02 09 50.713  -06 18 06.01  23.9g 15QC34    W84  C~55Wd      
2018 11  16.22052  02 16 18.201  -05 19 11.06  23.7i 15QC34    W84  C~55Wd      
2018 12  01.06511  02 15 10.864  -05 20 12.68  23.5r 15QC34    W84  C~55Wd      
2018 12  01.06649  02 15 10.851  -05 20 12.75  24.0g 15QC34    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    -0.07       0.00     0.08
     2   0.1611  -3556.24     0.05    -671.00    -0.07
     3   1.0624   5037.54     0.05     857.36    -0.13
     4   2.0836  10712.42     0.01    2064.06     0.05
     5   2.1762   8225.41    -0.01    1956.79    -0.01
     6   2.2635   5875.25     0.04    2385.87     0.13
     7   2.2635   5874.98    -0.14    2385.75    -0.02
     8   2.2635   5875.07     0.03    2385.88     0.08
     9   3.2439  12562.12    -0.05    3579.37    -0.01
    10   3.2846  11599.97     0.10    3888.98    -0.03
    11   3.2846  11599.76    -0.02    3888.99    -0.06

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.

15QC34    quality flag:2

Type:         5:2EEE  SCATNEAR    5:2EEE

axisobj        56.303    56.353    56.254
ecceobj         0.372     0.373     0.371
incobj         21.900    21.900    21.899
qmin           34.737    33.268    34.746
qmax           77.689    79.527    77.669
amean          55.462    55.483    55.462
amin           54.644    54.481    54.646
amax           56.505    56.703    56.467
emean           0.362     0.375     0.358
emin            0.350     0.349     0.340
emax            0.376     0.405     0.375
imean          20.526    20.005    20.751
imin           20.298    18.965    20.186
imax           20.786    21.316    21.264
excite_mean     0.504     0.508     0.504
fracstop        1.000     1.000     1.000
cjmean          2.912     2.908     2.913

libcent 0       180.0    -180.0     177.2
libamp  0       158.8    -180.0     149.7
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       153.4     169.6     184.5
kozaiamp        180.0     179.9     180.0