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 Mon Oct 23 01:38:42 2017
# Orbit generated from Bernstein formalism
# Fitting   22 observations of   22
# Arc:  69.81d
# First observation: 2016/08/25
#  Last observation: 2016/11/03
Preliminary a, adot, b, bdot, g, gdot:
   0.000004   0.030627   0.000011   0.001168   0.025944   0.000000
# Chi-squared of fit:    10.89 DOF:   38 RMS:  0.12
# Min/Max residuals:    -0.23    0.33
# Exact a, adot, b, bdot, g, gdot:
  1.914477E-05  2.914602E-02  1.511528E-06  9.891998E-04  2.536242E-02 -3.712607E-04
# Covariance matrix:
  2.3433E-13 -7.8237E-12 -1.4630E-14 -1.1945E-12 -1.1083E-12  5.4823E-11
 -7.8237E-12  2.3893E-09  1.2243E-11  3.6835E-10  6.2327E-10  4.4667E-08
 -1.4630E-14  1.2243E-11  2.3630E-13  6.5462E-13  3.4605E-12  3.0045E-10
 -1.1945E-12  3.6835E-10  6.5462E-13  7.1598E-11  9.4575E-11  6.3387E-09
 -1.1083E-12  6.2327E-10  3.4605E-12  9.4575E-11  1.7157E-10  1.3994E-08
  5.4823E-11  4.4667E-08  3.0045E-10  6.3387E-09  1.3994E-08  1.4836E-06
#      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:          355.94553 +/-     4.546
Argument of Peri:      284.11156 +/-     9.613
Long of Asc Node:      121.31971 +/-     0.042
Inclination:            15.61604 +/-     0.001
Eccentricity:         0.33064934 +/-    0.0046
Semi-Major Axis:     59.34489053 +/-    0.1632
Time of Perihelion: 2459501.1383 +/-    2108.8
Perihelion:          39.72254143 +/-    0.2922
Aphelion:            78.96723963 +/-    0.3473
Period (y)              457.1758 +/-      1.89
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           30.58980482 +/-    0.0153
Ecliptic Y           23.17172861 +/-    0.0122
Ecliptic Z          -10.67079782 +/-    0.0055
Ecliptic XDOT        -0.00196569 +/-    0.0001
Ecliptic YDOT         0.00244850 +/-    0.0001
Ecliptic ZDOT         0.00011362 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.83128283 +/-    0.0138
Geocenter to KBO     39.42841616 +/-    0.0204
# 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      

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    -0.20       0.00    -0.18
  2   0.0000      0.17     0.06       0.05    -0.05
  3   0.0027    -20.67     0.00     -20.70     0.16
  4   0.0027    -20.76    -0.04     -20.98    -0.08
  5   0.0027    -20.90    -0.09     -20.93     0.05
  6   0.0218   -206.90    -0.01    -164.79     0.18
  7   0.0218   -207.00    -0.03    -165.08    -0.06
  8   0.0219   -206.85     0.33    -165.13     0.02
  9   0.0492   -584.70     0.22    -353.60    -0.11
 10   0.0767  -1082.56    -0.00    -516.26    -0.11
 11   0.0767  -1082.70    -0.02    -516.21    -0.03
 12   0.0767  -1082.98     0.07    -516.12     0.16
 13   0.1041  -1678.52    -0.16    -645.98     0.16
 14   0.1041  -1678.62    -0.10    -646.27    -0.10
 15   0.1041  -1679.01    -0.23    -646.03     0.18
 16   0.1228  -2130.40     0.01    -713.99    -0.10
 17   0.1721  -3439.18     0.09    -802.28    -0.01
 18   0.1721  -3439.32     0.13    -802.23     0.04
 19   0.1721  -3439.81     0.14    -802.28    -0.01
 20   0.1723  -3443.99     0.09    -802.50    -0.19
 21   0.1911  -3961.89    -0.21    -799.13     0.03
 22   0.1911  -3962.03    -0.05    -799.09     0.07

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:1

Type:       SCATNEAR     3:1EE11:4EEEEEE
Type:                    3:1II          

axisobj        60.522    63.562    59.721
ecceobj         0.343     0.384     0.338
incobj         15.614    15.614    15.612
qmin           39.034    38.627    38.668
qmax           81.628    87.941    80.633
amean          59.817    62.630    59.100
amin           59.157    61.891    58.383
amax           60.639    63.564    59.995
emean           0.332     0.317     0.331
emin            0.320     0.202     0.319
emax            0.347     0.384     0.345
imean          14.387    18.050    14.203
imin           13.945    14.046    13.768
imax           14.717    23.190    14.575
excite_mean     0.415     0.448     0.412
fracstop        1.000     1.000     1.000
cjmean          3.079     3.075     3.073

libcent 0      -180.0      66.1     177.5
libamp  0      -180.0      62.6     166.5
libcent 1      -180.0     211.6    -180.0
libamp  1      -180.0      72.9    -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       162.0     235.5     169.3
kozaiamp        179.9      24.5     180.0