Orbit Fit and Astrometric record for 16QP85

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: 16QP85    
# Created Sun Jul 22 01:38:25 2018
# Orbit generated from Bernstein formalism
# Fitting   24 observations of   24
# Arc:   1.32y
# First observation: 2016/08/25
#  Last observation: 2017/12/20
Preliminary a, adot, b, bdot, g, gdot:
   0.000014   0.029638   0.000009   0.000997   0.025751   0.000000
# Chi-squared of fit:    14.73 DOF:   42 RMS:  0.14
# Min/Max residuals:    -0.33    0.33
# Exact a, adot, b, bdot, g, gdot:
  1.899625E-05  2.917620E-02  2.199468E-06  9.870468E-04  2.537070E-02  3.838965E-04
# Covariance matrix:
  2.0651E-13  2.5463E-13  3.2945E-14 -3.0715E-14  9.9940E-13  2.0750E-10
  2.5463E-13  1.7598E-12  1.0026E-13 -3.0092E-14  1.9020E-12  2.4810E-10
  3.2945E-14  1.0026E-13  8.6608E-14 -9.9714E-14  2.2757E-13  4.2090E-11
 -3.0715E-14 -3.0092E-14 -9.9714E-14  5.1729E-13 -3.7309E-13 -1.0209E-10
  9.9940E-13  1.9020E-12  2.2757E-13 -3.7309E-13  9.7967E-12  2.4068E-09
  2.0750E-10  2.4810E-10  4.2090E-11 -1.0209E-10  2.4068E-09  6.4526E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
  -15.702268   38.524097    0.924990   -0.111328   -0.396618  2457625.793058
# Heliocentric elements and errors
Epoch:              2457620.5000  =  2016/08/20
Mean Anomaly:          358.79441 +/-     3.021
Argument of Peri:      278.08251 +/-     6.381
Long of Asc Node:      121.36223 +/-     0.022
Inclination:            15.61482 +/-     0.001
Eccentricity:         0.33037359 +/-    0.0004
Semi-Major Axis:     59.44942779 +/-    0.0343
Time of Perihelion: 2458181.1829 +/-    1405.0
Perihelion:          39.80890689 +/-    0.0316
Aphelion:            79.08994869 +/-    0.0506
Period (y)              458.3843 +/-      0.40
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           30.58012303 +/-    0.0037
Ecliptic Y           23.16401292 +/-    0.0029
Ecliptic Z          -10.66728923 +/-    0.0013
Ecliptic XDOT        -0.00190575 +/-    0.0001
Ecliptic YDOT         0.00249906 +/-    0.0001
Ecliptic ZDOT         0.00009130 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.81841884 +/-    0.0033
Geocenter to KBO     39.41554844 +/-    0.0049
# Hcoef:  7.82

The following table shows the complete astrometric record for 16QP85. 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 (16QP85) followed by the observatory code and reference code for the source of the astrometry.

2016 08  25.292269 02 44 31.89   -00 33 41.2   23.1i 16QP85    W84  C~2B0K      
2016 08  25.296250 02 44 31.90   -00 33 41.1   23.1z 16QP85    W84  C~2B0K      
2016 08  26.279757 02 44 31.01   -00 34 07.3   23.7r 16QP85    W84  C~2B0K      
2016 08  26.282106 02 44 31.01   -00 34 07.6   23.0i 16QP85    W84  C~2B0K      
2016 08  26.286088 02 44 31.00   -00 34 07.6   23.2z 16QP85    W84  C~2B0K      
2016 09  02.266343 02 44 22.20   -00 37 22.2   23.8r 16QP85    W84  C~2B0K      
2016 09  02.268704 02 44 22.20   -00 37 22.5   23.1i 16QP85    W84  C~2B0K      
2016 09  02.275324 02 44 22.21   -00 37 22.5   23.1z 16QP85    W84  C~2B0K      
2016 09  12.268079 02 44 02.18   -00 42 19.2   22.9z 16QP85    W84  C~2B0K      
2016 09  22.308669 02 43 34.01   -00 47 28.7   23.6r 16QP85    W84  C~2B0K      
2016 09  22.311019 02 43 34.00   -00 47 28.7   23.1i 16QP85    W84  C~2B0K      
2016 09  22.317639 02 43 33.98   -00 47 28.7   23.1z 16QP85    W84  C~2B0K      
2016 10  02.309977 02 42 58.94   -00 52 37.4   23.5r 16QP85    W84  C~2B0K      
2016 10  02.312338 02 42 58.94   -00 52 37.7   23.0i 16QP85    W84  C~2B0K      
2016 10  02.316319 02 42 58.91   -00 52 37.6   22.8z 16QP85    W84  C~2B0K      
2016 10  09.127118 02 42 31.72   -00 56 02.6   22.8i 16QP85    W84  C~2B0K      
2016 10  27.157928 02 41 10.63   -01 04 13.5   23.5r 16QP85    W84  C~2B0K      
2016 10  27.160289 02 41 10.62   -01 04 13.5   23.1i 16QP85    W84  C~2B0K      
2016 10  27.166910 02 41 10.59   -01 04 13.7   22.8z 16QP85    W84  C~2B0K      
2016 10  27.220937 02 41 10.33   -01 04 15.2   23.7r 16QP85    W84  C~2B0K      
2016 11  03.098044 02 40 37.45   -01 06 53.0   22.8i 16QP85    W84  C~2B0K      
2016 11  03.102037 02 40 37.44   -01 06 53.0   22.7z 16QP85    W84  C~2B0K      
2017 12  20.26766  02 43 38.969  -00 38 59.51  23.6R 16QP85    G37              
2017 12  20.34405  02 43 38.719  -00 38 59.04        16QP85    G37              

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    -0.17       0.00    -0.33
  2   0.0000      0.17     0.09       0.05    -0.19
  3   0.0027    -20.67     0.03     -20.70     0.02
  4   0.0027    -20.76    -0.01     -20.98    -0.21
  5   0.0027    -20.90    -0.06     -20.93    -0.08
  6   0.0218   -206.90    -0.01    -164.79     0.10
  7   0.0218   -207.00    -0.03    -165.08    -0.14
  8   0.0219   -206.85     0.33    -165.13    -0.06
  9   0.0492   -584.70     0.22    -353.60    -0.12
 10   0.0767  -1082.56    -0.01    -516.26    -0.07
 11   0.0767  -1082.70    -0.02    -516.21     0.01
 12   0.0767  -1082.98     0.07    -516.12     0.19
 13   0.1041  -1678.52    -0.15    -645.98     0.23
 14   0.1041  -1678.62    -0.09    -646.27    -0.03
 15   0.1041  -1679.01    -0.23    -646.03     0.25
 16   0.1228  -2130.40     0.02    -713.99    -0.01
 17   0.1721  -3439.18     0.07    -802.28     0.09
 18   0.1721  -3439.32     0.11    -802.23     0.14
 19   0.1721  -3439.81     0.12    -802.28     0.10
 20   0.1723  -3443.99     0.07    -802.50    -0.08
 21   0.1911  -3961.89    -0.27    -799.13     0.13
 22   0.1911  -3962.03    -0.11    -799.09     0.17
 23   1.3196   -853.42     0.08     -55.49    -0.10
 24   1.3198   -856.84    -0.05     -53.87    -0.01

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.

16QP85    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        60.641    62.290    60.288
ecceobj         0.343     0.368     0.342
incobj         15.613    15.611    15.614
qmin           39.070    38.742    38.965
qmax           81.669    85.344    81.121
amean          59.828    61.467    59.493
amin           59.130    60.795    58.830
amax           60.680    62.348    60.331
emean           0.332     0.356     0.330
emin            0.318     0.343     0.318
emax            0.346     0.369     0.345
imean          14.318    14.368    14.413
imin           13.853    13.965    13.986
imax           14.915    14.887    14.863
excite_mean     0.414     0.434     0.414
fracstop        1.000     1.000     1.000
cjmean          3.080     3.077     3.076

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       166.2     173.9     171.5
kozaiamp        180.0     180.0     180.0