Orbit Fit and Astrometric record for 99RK257

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: 99RK257   
# Created Tue Dec 12 02:37:04 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting    8 observations of    8
# Arc:   2.07d
# First observation: 1999/09/11
#  Last observation: 1999/09/13
# Chi-squared of fit:    70.47 DOF:   10 RMS:  0.52
# Min/Max residuals:    -1.35    0.58
# Exact a, adot, b, bdot, g, gdot:
  1.527608E-05  2.579411E-02 -1.463765E-06 -4.681837E-03  2.536539E-02 -9.593766E-05
# Covariance matrix:
  3.2824E-11  2.5998E-07  7.4018E-13  1.1213E-08  4.2840E-08 -5.2915E-09
  2.5998E-07  2.0962E-03  5.9646E-09  9.0368E-05  3.4524E-04 -5.3258E-05
  7.4018E-13  5.9646E-09  5.6555E-13  1.3758E-10  9.8240E-10 -3.8988E-11
  1.1213E-08  9.0368E-05  1.3758E-10  3.9351E-06  1.4884E-05 -2.3851E-06
  4.2840E-08  3.4524E-04  9.8240E-10  1.4884E-05  5.6863E-05 -8.4428E-06
 -5.2915E-09 -5.3258E-05 -3.8988E-11 -2.3851E-06 -8.4428E-06  2.7229E-03
#      lat0       lon0       xBary       yBary       zBary        JD0
   10.442038  -23.417331   -0.195897    0.177447   -0.964177  2451432.748913
# Heliocentric elements and errors
Epoch:              2451432.5000  =  1999/09/11
Mean Anomaly:          359.77888 +/-    76.132
Argument of Peri:      135.10070 +/-     6.026
Long of Asc Node:      201.12128 +/-     0.649
Inclination:            14.44304 +/-     0.059
Eccentricity:         0.09740042 +/-    0.1644
Semi-Major Axis:     44.75404163 +/-    0.0166
Time of Perihelion: 2451499.6696 +/-   23126.6
Perihelion:          40.39497904 +/-    7.3565
Aphelion:            49.11310423 +/-    7.3565
Period (y)              299.4033 +/-      0.17
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           36.56291023 +/-    0.3986
Ecliptic Y          -15.61594410 +/-    0.1727
Ecliptic Z            7.14516702 +/-    0.0801
Ecliptic XDOT         0.00117705 +/-    0.0010
Ecliptic YDOT         0.00253076 +/-    0.0005
Ecliptic ZDOT        -0.00049878 +/-    0.0002
# Distances at JD0 (AU)
Heliocenter to KBO   40.39501886 +/-    0.3704
Geocenter to KBO     39.42383515 +/-    0.4417
# Hcoef:  8.36

The following table shows the complete astrometric record for 99RK257. 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 (99RK257) followed by the observatory code and reference code for the source of the astrometry.

1999 09  11.24817  22 17 56.96   +00 37 11.1   24.0I 99RK257   568  Ci2940      
1999 09  11.28215  22 17 56.82   +00 37 09.7         99RK257   568  Ci2940      
1999 09  12.26870  22 17 52.46   +00 36 38.9   24.5V 99RK257   568  Cd1603      
1999 09  12.28405  22 17 52.39   +00 36 38.3   24.6V 99RK257   568  Cd1603      
1999 09  12.29928  22 17 52.35   +00 36 37.8         99RK257   568  Cd1603      
1999 09  13.26075  22 17 48.21   +00 36 05.9   24.8V 99RK257   568  Cd1603      
1999 09  13.29270  22 17 48.09   +00 36 05.0   23.9V 99RK257   568  Cd1603      
1999 09  13.32267  22 17 47.96   +00 36 03.8         99RK257   568  Cd1603      

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    -1.35
  2   0.0001      0.00     0.47       0.00    -0.50
  3   0.0028      0.00    -0.53       0.00     0.58
  4   0.0028      0.00    -0.57       0.00     0.48
  5   0.0029      0.00    -0.16       0.00     0.47
  6   0.0055      0.00     0.07       0.00    -0.24
  7   0.0056      0.00     0.36       0.00    -0.10
  8   0.0057      0.00     0.39       0.00    -0.33

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.

99RK257    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        44.703    44.703    44.703
ecceobj         0.096     0.096     0.096
incobj         14.444    14.444    14.444
qmin           39.642    39.643    39.641
qmax           49.623    49.623    49.623
amean          44.509    44.509    44.509
amin           44.149    44.150    44.148
amax           44.888    44.888    44.888
emean           0.092     0.092     0.092
emin            0.079     0.079     0.079
emax            0.106     0.106     0.106
imean          15.042    15.042    15.042
imin           14.611    14.611    14.611
imax           15.421    15.421    15.421
excite_mean     0.275     0.275     0.275
fracstop        1.000     1.000     1.000
cjmean          3.014     3.014     3.014

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       184.4     184.4     184.4
kozaiamp        179.9     179.9     179.9