Orbit Fit and Astrometric record for 69987

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: 69987     
# Created Mon Oct 23 01:36:24 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   17 observations of   17
# Arc:  17.21y
# First observation: 1998/11/19
#  Last observation: 2016/02/04
# Chi-squared of fit:    26.66 DOF:   28 RMS:  0.22
# Min/Max residuals:    -0.53    0.49
# Exact a, adot, b, bdot, g, gdot:
  1.530675E-05  2.376850E-02 -2.075614E-07  2.350605E-05  2.436741E-02  3.619836E-04
# 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
   -1.070339   49.419552   -0.131946   -0.018457   -0.975346  2451136.726261
# Heliocentric elements and errors
Epoch:              2451136.5000  =  1998/11/19
Mean Anomaly:           47.88823 +/-     0.000
Argument of Peri:      223.08902 +/-     0.000
Long of Asc Node:      136.23920 +/-     0.000
Inclination:             1.04715 +/-     0.000
Eccentricity:         0.02728745 +/-    0.0000
Semi-Major Axis:     42.78373660 +/-    0.0000
Time of Perihelion: 2437539.5101 +/-       0.0
Perihelion:          41.61627732 +/-    0.0000
Aphelion:            43.95119588 +/-    0.0000
Period (y)              279.8506 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           27.23373940 +/-    0.0000
Ecliptic Y           31.98942524 +/-    0.0000
Ecliptic Z           -0.76658704 +/-    0.0000
Ecliptic XDOT        -0.00200239 +/-    0.0000
Ecliptic YDOT         0.00177727 +/-    0.0000
Ecliptic ZDOT         0.00000185 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.01888205 +/-    0.0000
Geocenter to KBO     41.03845092 +/-    0.0000
# Hcoef:  7.22

The following table shows the complete astrometric record for 69987. 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 (69987) followed by the observatory code and reference code for the source of the astrometry.

1998 11  19.22553  03 09 05.16   +16 33 14.2   22.8R 69987     695  Ca3208      
1998 11  19.29635  03 09 04.79   +16 33 12.8         69987     695  Ca3208      
1998 11  19.36883  03 09 04.43   +16 33 11.3         69987     695  Ca3208      
1998 11  26.32836  03 08 30.74   +16 30 58.0   23.1R 69987     695  Ca3208      
1998 11  27.32464  03 08 26.02   +16 30 39.2         69987     695  Ca3208      
1998 11  27.44027  03 08 25.47   +16 30 37.2         69987     695  Ca3208      
1999 10  06.55934  03 17 55.98   +17 08 26.3         69987     568  Ca6740      
1999 10  09.53349  03 17 44.81   +17 07 40.8         69987     568  Ca6740      
1999 10  09.57011  03 17 44.67   +17 07 40.3         69987     568  Ca6740      
2000 11  23.19933  03 19 43.59   +17 15 08.8   23.3R 69987     695  Cc2190      
2000 11  23.40068  03 19 42.60   +17 15 04.9         69987     695  Cc2190      
2002 02  06.38530  03 21 38.60   +17 23 58.7   22.5R 69987     568  Cf1458      
2002 02  07.38311  03 21 38.91   +17 24 01.5         69987     568  Cf1458      
2003 10  22.31963  03 38 58.09   +18 24 46.0   23.5R 69987     304  Ci9217      
2003 10  22.33438  03 38 57.97   +18 24 45.7         69987     304  Ci9217      
2016 02  04.16487  04 38 49.85   +21 10 07.1   23.6R 69987     G37  C~1mO5      
2016 02  04.29596  04 38 49.59   +21 10 06.7         69987     G37  C~1mO5      

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    -0.08       0.00    -0.11
  2   0.0002      0.00    -0.19       0.00     0.05
  3   0.0004      0.00    -0.17       0.00    -0.03
  4   0.0194      0.00    -0.07       0.00     0.25
  5   0.0222      0.00     0.10       0.00     0.12
  6   0.0225      0.00     0.15       0.00     0.31
  7   0.8798      0.00     0.02       0.00    -0.53
  8   0.8879      0.00     0.09       0.00    -0.31
  9   0.8880      0.00     0.15       0.00    -0.23
 10   2.0122      0.00     0.28       0.00     0.16
 11   2.0128      0.00     0.49       0.00    -0.04
 12   3.2174      0.00     0.01       0.00     0.07
 13   3.2201      0.00    -0.33       0.00     0.00
 14   4.9229      0.00     0.36       0.00     0.18
 15   4.9230      0.00    -0.46       0.00     0.11
 16  17.2100      0.00     0.10       0.00     0.02
 17  17.2103      0.00    -0.03       0.00    -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.

69987    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        42.866    42.866    42.866
ecceobj         0.027     0.027     0.027
incobj          1.047     1.047     1.047
qmin           40.282    40.287    40.278
qmax           45.043    45.049    45.037
amean          42.558    42.558    42.558
amin           42.237    42.235    42.239
amax           42.901    42.901    42.900
emean           0.032     0.032     0.032
emin            0.008     0.008     0.008
emax            0.050     0.050     0.050
imean           2.133     2.133     2.133
imin            0.774     0.774     0.774
imax            3.016     3.017     3.015
excite_mean     0.049     0.049     0.049
fracstop        1.000     1.000     1.000
cjmean          3.081     3.081     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       182.9     183.0     182.9
kozaiamp        179.9     179.9     180.0