Orbit Fit and Astrometric record for 16684

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: 16684     
# Created Mon Dec 18 02:36:20 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   50 observations of   50
# Arc:   7.03y
# First observation: 1994/05/11
#  Last observation: 2001/05/23
# Chi-squared of fit:   387.46 DOF:   94 RMS:  0.49
# Min/Max residuals:    -1.21    0.91
# Exact a, adot, b, bdot, g, gdot:
  2.001485E-05  2.281965E-02  5.239132E-07 -1.491886E-03  2.368356E-02 -1.229550E-03
# Covariance matrix:
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.249249 -151.128474   -0.375992   -0.004034   -0.931627  2449484.439587
# Heliocentric elements and errors
Epoch:              2449484.5000  =  1994/05/12
Mean Anomaly:          303.00901 +/-     0.000
Argument of Peri:      246.02619 +/-     0.000
Long of Asc Node:       25.64649 +/-     0.000
Inclination:             3.73932 +/-     0.000
Eccentricity:         0.05317738 +/-    0.0000
Semi-Major Axis:     44.35320611 +/-    0.0000
Time of Perihelion: 2466564.5709 +/-       0.0
Perihelion:          41.99461885 +/-    0.0000
Aphelion:            46.71179338 +/-    0.0000
Period (y)              295.3900 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.60921328 +/-    0.0000
Ecliptic Y          -21.17384501 +/-    0.0000
Ecliptic Z           -0.18364559 +/-    0.0000
Ecliptic XDOT         0.00140435 +/-    0.0000
Ecliptic YDOT        -0.00224471 +/-    0.0000
Ecliptic ZDOT        -0.00017198 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.16040915 +/-    0.0000
Geocenter to KBO     42.22344618 +/-    0.0000
# Hcoef:  6.88

The following table shows the complete astrometric record for 16684. 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 (16684) followed by the observatory code and reference code for the source of the astrometry.

1994 05  11.93889  13 46 58.52   -11 18 22.9   22.9R 16684     950  A23646      
1994 05  13.98194  13 46 50.20   -11 17 38.1   24. V 16684     950  A23646      
1994 05  14.89514  13 46 46.58   -11 17 18.3         16684     950  A23646      
1994 05  15.97639  13 46 42.24   -11 16 55.1         16684     950  A23646      
1994 05  16.98958  13 46 38.29   -11 16 32.2         16684     950  A23646      
1994 06  03.93333  13 45 36.04   -11 10 57.0         16684     950   23646      
1995 02  25.5758   13 56 50.00   -12 16 50.6   22.0R 16684     568  A24813      
1995 02  25.5852   13 56 49.98   -12 16 50.7         16684     568  A24813      
1995 02  26.41493  13 56 48.04   -12 16 41.6         16684     675  C25125      
1995 02  26.53646  13 56 47.78   -12 16 40.0         16684     675  C25125      
1995 02  26.5526   13 56 47.77   -12 16 40.4         16684     568  A24813      
1995 04  01.1229   13 54 53.68   -12 06 59.5         16684     950  C25182      
1995 04  01.1764   13 54 53.45   -12 06 58.1   23.2R 16684     950  C25029      
1995 04  07.21883  13 54 27.36   -12 04 43.0   23. R 16684     809  C25179      
1995 04  07.31584  13 54 26.93   -12 04 40.8         16684     809  C25179      
1995 04  07.32868  13 54 26.87   -12 04 40.6         16684     809  C25179      
1995 04  07.34153  13 54 26.81   -12 04 40.3         16684     809  C25179      
1997 04  07.05448  14 04 18.67   -13 08 40.4         16684     950  C30062      
1997 04  07.09899  14 04 18.50   -13 08 39.6         16684     950  C30062      
1997 04  07.15582  14 04 18.23   -13 08 38.4         16684     950  C30062      
1997 04  08.06231  14 04 14.23   -13 08 18.0         16684     950  C30062      
1997 04  08.10719  14 04 14.02   -13 08 17.3         16684     950  C30062      
1997 04  08.16403  14 04 13.79   -13 08 16.2         16684     950  C30062      
1997 05  31.24160  14 00 26.30   -12 48 45.4   23.5R 16684     696  C30018      
1997 05  31.30419  14 00 26.04   -12 48 43.7         16684     696  C30018      
1997 06  01.31049  14 00 22.71   -12 48 25.4         16684     696  C30018      
1998 06  23.17463  14 04 18.93   -13 14 56.3   22.1R 16684     705  Ca1682      
1998 06  23.19876  14 04 18.88   -13 14 56.1   22.3R 16684     705  Ca1682      
1998 06  23.20485  14 04 18.86   -13 14 56.1   22.5R 16684     705  Ca1682      
1998 06  23.20763  14 04 18.93   -13 14 55.4   23.0R 16684     705  Ca1682      
1998 06  23.23968  14 04 18.77   -13 14 55.8   22.7R 16684     705  Ca1682      
1998 06  23.24598  14 04 18.75   -13 14 55.8   23.1R 16684     705  Ca1682      
1998 06  23.24877  14 04 18.85   -13 14 55.1         16684     705  Ca1682      
1998 06  24.18208  14 04 17.05   -13 14 45.7         16684     705  Ca1682      
1998 06  24.20626  14 04 16.97   -13 14 45.4         16684     705  Ca1682      
1998 06  24.23200  14 04 16.92   -13 14 44.9         16684     705  Ca1682      
1998 06  24.25579  14 04 16.88   -13 14 44.8         16684     705  Ca1682      
1999 03  12.22387  14 15 55.88   -14 19 12.1         16684     829  Cb7359      
1999 03  12.29363  14 15 55.69   -14 19 10.2         16684     829  Cb7359      
1999 03  12.35495  14 15 55.48   -14 19 09.8         16684     829  Cb7359      
1999 05  21.31166  14 11 00.94   -13 55 15.2   23.0R 16684     697  Cb0711      
1999 05  21.35213  14 11 00.78   -13 55 14.2   23.4R 16684     697  Cb0711      
1999 05  23.29515  14 10 52.87   -13 54 34.5   23.4R 16684     697  Cb0711      
2000 06  28.95131  14 13 59.87   -14 16 04.3         16684     950  Cb6356      
2000 06  28.97688  14 13 59.81   -14 16 04.5         16684     950  Cb6356      
2000 06  29.00241  14 13 59.75   -14 16 04.2         16684     950  Cb6356      
2001 05  21.40836  14 21 01.87   -14 56 52.7         16684     568  Cd2683      
2001 05  21.42471  14 21 01.80   -14 56 52.4         16684     568  Cd2683      
2001 05  23.02756  14 20 55.14   -14 56 19.8   22.8R 16684     807  Cd2040      
2001 05  23.11971  14 20 54.75   -14 56 18.1         16684     807  Cd2040      

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    -0.18       0.00     0.85
  2   0.0056      0.00    -0.68       0.00    -0.23
  3   0.0081      0.00     0.06       0.00    -0.30
  4   0.0111      0.00    -0.33       0.00    -0.40
  5   0.0138      0.00     0.34       0.00     0.91
  6   0.0630      0.00    -0.21       0.00    -0.39
  7   0.7930      0.00     0.75       0.00     0.61
  8   0.7930      0.00     0.77       0.00     0.41
  9   0.7953      0.00    -0.02       0.00     0.35
 10   0.7956      0.00     0.43       0.00     0.58
 11   0.7957      0.00     0.74       0.00    -0.04
 12   0.8876      0.00     0.48       0.00     0.22
 13   0.8877      0.00     0.48       0.00     0.44
 14   0.9043      0.00    -0.01       0.00    -0.64
 15   0.9045      0.00     0.04       0.00    -0.67
 16   0.9046      0.00     0.00       0.00    -0.77
 17   0.9046      0.00    -0.04       0.00    -0.77
 18   2.9052      0.00     0.17       0.00     0.39
 19   2.9053      0.00     0.59       0.00     0.21
 20   2.9055      0.00     0.34       0.00     0.15
 21   2.9079      0.00    -0.08       0.00     0.51
 22   2.9081      0.00    -0.22       0.00     0.21
 23   2.9082      0.00     0.15       0.00     0.05
 24   3.0535      0.00    -0.01       0.00    -0.80
 25   3.0537      0.00    -0.62       0.00    -0.23
 26   3.0565      0.00     0.88       0.00     0.11
 27   4.1156      0.00    -0.60       0.00    -0.12
 28   4.1157      0.00    -0.61       0.00    -0.18
 29   4.1157      0.00    -0.72       0.00    -0.24
 30   4.1157      0.00     0.42       0.00     0.43
 31   4.1158      0.00    -0.99       0.00    -0.31
 32   4.1158      0.00    -1.10       0.00    -0.38
 33   4.1158      0.00     0.49       0.00     0.30
 34   4.1184      0.00     0.80       0.00     0.15
 35   4.1185      0.00     0.32       0.00     0.21
 36   4.1185      0.00     0.34       0.00     0.44
 37   4.1186      0.00     0.44       0.00     0.30
 38   4.8331      0.00    -1.21       0.00    -0.87
 39   4.8333      0.00    -0.85       0.00     0.09
 40   4.8334      0.00    -1.17       0.00    -0.35
 41   5.0250      0.00     0.29       0.00    -0.00
 42   5.0251      0.00     0.42       0.00     0.15
 43   5.0304      0.00     0.22       0.00    -0.12
 44   6.1328      0.00     0.70       0.00     0.20
 45   6.1329      0.00     0.48       0.00    -0.23
 46   6.1330      0.00     0.27       0.00    -0.16
 47   7.0266      0.00    -0.13       0.00     0.32
 48   7.0267      0.00    -0.12       0.00     0.28
 49   7.0310      0.00     0.63       0.00    -0.17
 50   7.0313      0.00     0.64       0.00    -0.34

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.

16684    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.804    43.804    43.804
ecceobj         0.047     0.047     0.047
incobj          3.755     3.755     3.755
qmin           41.375    41.396    41.364
qmax           47.094    47.092    47.075
amean          44.132    44.132    44.132
amin           43.786    43.787    43.785
amax           44.495    44.490    44.491
emean           0.044     0.044     0.044
emin            0.028     0.028     0.028
emax            0.059     0.059     0.058
imean           3.392     3.392     3.392
imin            2.723     2.723     2.723
imax            3.934     3.934     3.934
excite_mean     0.074     0.074     0.074
fracstop        1.000     1.000     1.000
cjmean          3.096     3.096     3.096

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       183.9     184.1     183.8
kozaiamp        179.9     180.0     180.0