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 Tue Dec  7 02:13:58 2021
# Orbit generated from Bernstein formalism
# Fitting     70 observations of     70
# Arc:   3.31y
# First observation: 2014/09/24
#  Last observation: 2018/01/16
Preliminary a, adot, b, bdot, g, gdot:
  -0.000078   0.029544   0.000009   0.000451   0.025799   0.000000
# Chi-squared of fit:    62.05 DOF:    134 RMS:  0.17
# Min/Max residuals:    -0.41    0.38
# Exact a, adot, b, bdot, g, gdot:
  1.869339E-05  2.942955E-02  1.144070E-06  4.640349E-04  2.560129E-02 -3.802135E-04
# Covariance matrix:
  2.9660E-13 -2.2035E-13  3.2851E-15 -3.3777E-15 -7.3436E-14 -1.4401E-12
 -2.2035E-13  3.2005E-13 -7.0795E-15  7.2512E-15  1.4205E-13  3.0325E-12
  3.2851E-15 -7.0795E-15  2.2971E-13 -8.2067E-14 -2.1977E-15 -7.9236E-14
 -3.3777E-15  7.2512E-15 -8.2067E-14  3.2333E-14  2.3904E-15  8.0654E-14
 -7.3436E-14  1.4205E-13 -2.1977E-15  2.3904E-15  1.2526E-13  1.2969E-12
 -1.4401E-12  3.0325E-12 -7.9236E-14  8.0654E-14  1.2969E-12  3.2658E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
  -15.931175   34.683188    0.559442   -0.229236   -0.803654  2456924.792788
# Heliocentric elements and errors
Epoch:              2456920.5000  =  2014/09/20
Mean Anomaly:          356.90666 +/-     0.021
Argument of Peri:      278.91454 +/-     0.044
Long of Asc Node:      121.41738 +/-     0.001
Inclination:            15.61380 +/-     0.000
Eccentricity:         0.33525584 +/-    0.0000
Semi-Major Axis:     59.87536811 +/-    0.0040
Time of Perihelion: 2458374.6073 +/-       9.8
Perihelion:          39.80180136 +/-    0.0036
Aphelion:            79.94893486 +/-    0.0059
Period (y)              463.3194 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           31.88898027 +/-    0.0004
Ecliptic Y           21.39070825 +/-    0.0003
Ecliptic Z          -10.72141711 +/-    0.0001
Ecliptic XDOT        -0.00181651 +/-    0.0000
Ecliptic YDOT         0.00256894 +/-    0.0000
Ecliptic ZDOT         0.00005899 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.86750867 +/-    0.0004
Geocenter to KBO     39.06052643 +/-    0.0005
# Hcoef:  7.34

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.

2014 09  24.29201  02 30 48.754  -01 57 30.67  24.6g 16QP85    W84  C~4ybM      
2014 10  21.31854  02 28 56.632  -02 11 01.59  23.1i 16QP85    W84  C~4ybM      
2014 10  29.29448  02 28 19.087  -02 14 22.46  23.4r 16QP85    W84  C~4ybM      
2014 12  24.13625  02 24 35.525  -02 21 38.90  23.1i 16QP85    W84  C~4ybM      
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 09  24.28330  02 43 27.633  -00 48 30.09  23.5r 16QP85    W84  C~4ybM      
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 10  27.22094  02 41 10.343  -01 04 15.44  23.7r 16QP85    W84  C~4ybM      
2016 10  27.25910  02 41 10.150  -01 04 16.31  22.9i 16QP85    W84  C~4ybM      
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      
2016 12  05.18660  02 38 12.268  -01 13 50.39  23.5i 16QP85    W84  C~4ybM      
2017 09  14.243120 02 50 16.665  -00 08 36.09  23.7r 16QP85    W84  C~2g4h      
2017 09  14.245469 02 50 16.675  -00 08 36.13  23.0i 16QP85    W84  C~2g4h      
2017 09  14.248108 02 50 16.670  -00 08 36.30  22.9z 16QP85    W84  C~2g4h      
2017 09  25.294323 02 49 45.003  -00 14 11.43  23.3r 16QP85    W84  C~2g4h      
2017 09  25.296696 02 49 45.000  -00 14 11.50  23.1i 16QP85    W84  C~2g4h      
2017 09  25.299335 02 49 44.978  -00 14 11.58  22.9z 16QP85    W84  C~2g4h      
2017 10  02.196846 02 49 20.886  -00 17 40.77  22.6i 16QP85    W84  C~2g4h      
2017 10  14.271152 02 48 32.121  -00 23 35.19  23.6r 16QP85    W84  C~2g4h      
2017 10  14.273513 02 48 32.132  -00 23 35.18  23.1i 16QP85    W84  C~2g4h      
2017 10  14.276152 02 48 32.093  -00 23 35.40  22.8z 16QP85    W84  C~2g4h      
2017 10  19.257350 02 48 10.062  -00 25 52.70  24.3g 16QP85    W84  C~2g4h      
2017 10  19.259566 02 48 10.060  -00 25 53.16  23.6r 16QP85    W84  C~2g4h      
2017 10  19.261904 02 48 10.057  -00 25 53.31  23.0i 16QP85    W84  C~2g4h      
2017 10  19.264566 02 48 10.026  -00 25 53.27  22.8z 16QP85    W84  C~2g4h      
2017 10  26.209624 02 47 37.965  -00 28 53.27  23.0i 16QP85    W84  C~2g4h      
2017 10  26.212275 02 47 37.962  -00 28 53.19  22.7z 16QP85    W84  C~2g4h      
2017 10  26.274346 02 47 37.664  -00 28 54.79  23.4r 16QP85    W84  C~2g4h      
2017 10  26.276696 02 47 37.641  -00 28 54.70  23.2i 16QP85    W84  C~2g4h      
2017 10  26.279337 02 47 37.635  -00 28 55.02  22.8z 16QP85    W84  C~2g4h      
2017 10  29.28689  02 47 23.419  -00 30 07.78  23.6r 16QP85    W84  C~4ybM      
2017 11  14.180423 02 46 07.159  -00 35 28.72  23.5r 16QP85    W84  C~2g4h      
2017 11  14.182795 02 46 07.147  -00 35 28.82  22.9i 16QP85    W84  C~2g4h      
2017 11  14.185434 02 46 07.131  -00 35 28.70  22.9z 16QP85    W84  C~2g4h      
2017 11  19.201048 02 45 43.463  -00 36 44.31  23.5r 16QP85    W84  C~2g4h      
2017 11  19.203409 02 45 43.447  -00 36 44.40  23.1i 16QP85    W84  C~2g4h      
2017 11  19.206048 02 45 43.419  -00 36 44.32  22.8z 16QP85    W84  C~2g4h      
2017 11  22.17853  02 45 29.699  -00 37 22.90  22.9i 16QP85    W84  C~4ybM      
2017 11  25.179080 02 45 16.061  -00 37 56.18  23.2i 16QP85    W84  C~2g4h      
2017 12  20.26766  02 43 38.969  -00 38 59.51  23.6R 16QP85    G37  C~4O8a      
2017 12  20.34405  02 43 38.719  -00 38 59.04        16QP85    G37  C~4O8a      
2017 12  26.093652 02 43 22.273  -00 38 16.16  23.6r 16QP85    W84  C~2g4h      
2017 12  26.096013 02 43 22.269  -00 38 16.21  23.3i 16QP85    W84  C~2g4h      
2017 12  26.098653 02 43 22.253  -00 38 16.08  22.9z 16QP85    W84  C~2g4h      
2018 01  04.119763 02 43 01.947  -00 36 26.54  23.1i 16QP85    W84  C~2g4h      
2018 01  04.122425 02 43 01.951  -00 36 26.39  23.2z 16QP85    W84  C~2g4h      
2018 01  11.100446 02 42 51.181  -00 34 27.55  23.0i 16QP85    W84  C~2g4i      
2018 01  11.103096 02 42 51.172  -00 34 27.41  22.8z 16QP85    W84  C~2g4i      
2018 01  16.092147 02 42 46.290  -00 32 44.47  23.7r 16QP85    W84  C~2g4i      
2018 01  16.094485 02 42 46.283  -00 32 44.44  23.2i 16QP85    W84  C~2g4i      
2018 01  16.097124 02 42 46.292  -00 32 44.32  22.9z 16QP85    W84  C~2g4i      

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    -0.11       0.00    -0.18
     2   0.0740  -1853.59    -0.10    -216.45    -0.16
     3   0.0958  -2451.15     0.15    -222.28    -0.41
     4   0.2487  -5762.06     0.09     459.79    -0.07
     5   1.9192  13329.11    -0.15     703.11    -0.17
     6   1.9192  13329.28     0.12     703.15    -0.04
     7   1.9219  13307.98     0.06     682.75     0.18
     8   1.9219  13307.88     0.01     682.47    -0.06
     9   1.9220  13307.73    -0.04     682.51     0.07
    10   1.9411  13118.35     0.01     541.78     0.24
    11   1.9411  13118.25    -0.01     541.49     0.00
    12   1.9411  13118.39     0.35     541.44     0.08
    13   1.9684  12735.65     0.22     359.54     0.01
    14   1.9959  12233.06    -0.03     205.73     0.05
    15   1.9959  12232.92    -0.04     205.78     0.13
    16   1.9960  12232.63     0.05     205.88     0.32
    17   2.0013  12122.17     0.26     179.13    -0.15
    18   2.0233  11632.84    -0.18      86.77     0.35
    19   2.0233  11632.74    -0.13      86.49     0.09
    20   2.0233  11632.34    -0.26      86.73     0.37
    21   2.0420  11178.45    -0.03      26.98     0.10
    22   2.0914   9865.11    -0.01     -37.30     0.19
    23   2.0914   9864.96     0.03     -37.25     0.24
    24   2.0914   9864.47     0.04     -37.29     0.19
    25   2.0915   9860.29    -0.01     -37.43     0.02
    26   2.0915   9860.39     0.09     -37.72    -0.27
    27   2.0916   9857.37    -0.02     -37.59    -0.17
    28   2.1104   9341.58    -0.36     -24.53     0.23
    29   2.1104   9341.44    -0.20     -24.48     0.27
    30   2.1982   7144.42     0.09     296.14    -0.26
    31   2.9732  18740.80     0.07     424.65    -0.12
    32   2.9732  18740.93     0.31     424.56    -0.17
    33   2.9732  18740.81     0.30     424.43    -0.26
    34   3.0034  18177.54     0.02     263.41     0.11
    35   3.0034  18177.47     0.09     263.36     0.08
    36   3.0034  18177.13    -0.10     263.39     0.15
    37   3.0223  17763.95     0.16     184.33     0.38
    38   3.0554  16950.91    -0.27      89.76     0.11
    39   3.0554  16951.07     0.07      89.71     0.08
    40   3.0554  16950.44    -0.37      89.70     0.08
    41   3.0690  16590.85    -0.07      68.60     0.35
    42   3.0690  16590.67    -0.08      68.18    -0.07
    43   3.0690  16590.58    -0.00      68.05    -0.19
    44   3.0691  16590.15    -0.23      68.24     0.01
    45   3.0881  16073.58    -0.19      56.31    -0.02
    46   3.0881  16073.57    -0.00      56.40     0.07
    47   3.0882  16068.79    -0.04      56.36     0.02
    48   3.0883  16068.49    -0.16      56.56     0.21
    49   3.0883  16068.30    -0.15      56.29    -0.06
    50   3.0965  15841.65     0.10      57.67    -0.15
    51   3.1400  14649.39     0.11     130.76    -0.05
    52   3.1400  14649.19     0.08     130.72    -0.11
    53   3.1400  14649.00     0.09     130.92     0.06
    54   3.1538  14287.10     0.17     176.29     0.07
    55   3.1538  14286.84     0.08     176.29     0.04
    56   3.1538  14286.47    -0.10     176.50     0.22
    57   3.1619  14078.46     0.28     207.76    -0.24
    58   3.1701  13873.39     0.05     243.63     0.05
    59   3.2388  12471.47     0.11     663.06    -0.21
    60   3.2390  12468.07    -0.02     664.74    -0.12
    61   3.2548  12248.39    -0.10     786.46    -0.22
    62   3.2548  12248.32    -0.09     786.44    -0.30
    63   3.2548  12248.14    -0.18     786.64    -0.15
    64   3.2795  11995.59     0.01     990.46    -0.23
    65   3.2795  11995.70     0.17     990.58    -0.17
    66   3.2986  11881.79    -0.01    1156.14    -0.33
    67   3.2986  11881.70    -0.06    1156.32    -0.22
    68   3.3123  11846.24     0.03    1277.80     0.03
    69   3.3123  11846.15    -0.05    1277.86     0.03
    70   3.3123  11846.32     0.12    1277.93     0.04

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        60.640    60.653    60.627
ecceobj         0.343     0.343     0.343
incobj         15.613    15.613    15.613
qmin           39.228    39.176    38.986
qmax           81.582    81.670    81.789
amean          59.840    59.840    59.824
amin           59.160    59.148    59.147
amax           60.694    60.709    60.676
emean           0.330     0.330     0.334
emin            0.316     0.317     0.321
emax            0.344     0.345     0.348
imean          14.538    14.455    14.048
imin           14.031    13.953    13.673
imax           15.029    14.891    14.552
excite_mean     0.414     0.414     0.413
fracstop        1.000     1.000     1.000
cjmean          3.080     3.080     3.081

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       172.6     173.0     175.3
kozaiamp        180.0     180.0     180.0