Orbit Fit and Astrometric record for 99CW118

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: 99CW118   
# Created Mon Sep 25 01:37:02 2017
# Orbit generated from Bernstein formalism
# Fitting    7 observations of    7
# Arc:  86.00d
# First observation: 1999/02/10
#  Last observation: 1999/05/07
Preliminary a, adot, b, bdot, g, gdot:
   0.000000   0.039613  -0.000001   0.000327   0.026433   0.000000
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# Chi-squared of fit:     4.03 DOF:    9 RMS:  0.13
# Min/Max residuals:    -0.24    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.400722E-05  2.026739E-02 -3.446831E-07  3.105158E-04  2.312557E-02  7.186804E-03
# Covariance matrix:
 -1.6873E-10 -2.4784E-07  5.9463E-12 -1.9624E-10 -4.1736E-08  7.7117E-07
 -2.4784E-07 -3.6245E-04  8.6984E-09 -2.8713E-07 -6.1045E-05  1.1260E-03
  5.9463E-12  8.6984E-09  1.2073E-13  5.3125E-12  1.4650E-09 -2.7027E-08
 -1.9624E-10 -2.8713E-07  5.3125E-12 -2.0644E-10 -4.8357E-08  8.9228E-07
 -4.1736E-08 -6.1045E-05  1.4650E-09 -4.8357E-08 -1.0281E-05  1.8966E-04
  7.7117E-07  1.1260E-03 -2.7027E-08  8.9228E-07  1.8966E-04 -3.4945E-03
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.174466  167.082295    0.428053    0.002504   -0.896288  2451219.940773
# Heliocentric elements and errors
Epoch:              2451210.5000  =  1999/02/01
Mean Anomaly:           77.89458 +/-   315.035
Argument of Peri:      255.58101 +/-   255.581
Long of Asc Node:      155.53968 +/-   155.540
Inclination:             0.89695 +/-     0.897
Eccentricity:         0.32930531 +/-    0.3293
Semi-Major Axis:     42.50703844 +/-   42.5070
Time of Perihelion: 2429307.9619 +/- 9999999.9
Perihelion:          28.50924504 +/-   31.7603
Aphelion:            56.50483185 +/-   58.2128
Period (y)              277.1402 +/-    415.71
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -42.91737370 +/-  -42.9174
Ecliptic Y           10.28386484 +/-   10.2839
Ecliptic Z            0.13166091 +/-    0.1317
Ecliptic XDOT        -0.00136729 +/-   -0.0014
Ecliptic YDOT        -0.00213955 +/-   -0.0021
Ecliptic ZDOT         0.00003935 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.13248436 +/-   41.8045
Geocenter to KBO     43.24217243 +/-   43.2422
# Hcoef:  7.76

The following table shows the complete astrometric record for 99CW118. 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 (99CW118) followed by the observatory code and reference code for the source of the astrometry.

1999 02  10.44003  11 12 44.36   +05 15 44.6   23.8R 99CW118   568  Ca4013      
1999 02  10.48103  11 12 44.20   +05 15 45.5   23.8R 99CW118   568  Ca4013      
1999 02  18.56215  11 12 11.62   +05 19 13.4   23.8R 99CW118   568  Ca4013      
1999 02  18.57375  11 12 11.55   +05 19 13.8   23.8R 99CW118   568  Ca4013      
1999 02  18.61034  11 12 11.42   +05 19 14.6   23.8R 99CW118   568  Ca4013      
1999 05  07.39647  11 07 26.39   +05 49 15.4   24.1R 99CW118   568  Ca4843      
1999 05  07.43759  11 07 26.28   +05 49 15.9   24.1R 99CW118   568  Ca4843      

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    -0.03       0.00     0.11
  2   0.0001     -2.55     0.05      -0.10     0.02
  3   0.0222   -531.72     0.09       1.99    -0.02
  4   0.0223   -532.84    -0.23       1.95    -0.06
  5   0.0224   -534.94     0.17       1.93    -0.07
  6   0.2353  -5156.60     0.26       9.44     0.09
  7   0.2354  -5158.31    -0.24       9.27    -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.

99CW118    quality flag:1

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        42.612    51.739    38.385
ecceobj         0.330     0.491     0.223
incobj          0.898     0.879     0.920
qmin           28.555    26.121    29.836
qmax           58.289    78.382    50.517
amean          43.069    51.654    38.929
amin           42.612    50.866    38.386
amax           43.526    52.429    40.240
emean           0.335     0.487     0.227
emin            0.330     0.479     0.212
emax            0.339     0.495     0.255
imean           1.194     1.201     1.229
imin            1.183     1.171     1.184
imax            1.205     1.340     1.358
excite_mean     0.335     0.487     0.228
fracstop        0.000     0.020     0.000
cjmean          2.954     2.871     2.987

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       256.3     273.0     225.6
kozaiamp          0.4       4.4       4.6