Orbit Fit and Astrometric record for 97RX9

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: 97RX9     
# Created Mon Dec 18 02:36:55 2017
# Orbit generated from Bernstein formalism
# Fitting   22 observations of   22
# Arc:   2.92y
# First observation: 1997/09/07
#  Last observation: 2000/08/08
Preliminary a, adot, b, bdot, g, gdot:
  -0.000115   0.020160   0.000011  -0.011583   0.023853   0.000000
# Chi-squared of fit:   100.80 DOF:   38 RMS:  0.38
# Min/Max residuals:    -0.86    0.79
# Exact a, adot, b, bdot, g, gdot:
  1.012359E-05  2.018464E-02 -1.141142E-05 -1.165050E-02  2.428430E-02  1.215199E-03
# Covariance matrix:
  2.2522E-13 -7.3409E-13 -4.1782E-14  2.9400E-13  1.9868E-13 -8.4585E-12
 -7.3409E-13  5.2622E-12  3.2356E-13 -2.2788E-12 -1.2308E-12  6.5546E-11
 -4.1782E-14  3.2356E-13  1.5251E-13 -1.9141E-13 -6.8779E-14  4.0855E-12
  2.9400E-13 -2.2788E-12 -1.9141E-13  1.0384E-12  4.8130E-13 -2.8785E-11
  1.9868E-13 -1.2308E-12 -6.8779E-14  4.8130E-13  7.3584E-13 -1.3869E-11
 -8.4585E-12  6.5546E-11  4.0855E-12 -2.8785E-11 -1.3869E-11  8.2784E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.010807  -16.143900   -0.017584   -0.000019   -0.999143  2450698.787871
# Heliocentric elements and errors
Epoch:              2450690.5000  =  1997/08/30
Mean Anomaly:           94.89153 +/-     0.596
Argument of Peri:       78.98835 +/-     0.541
Long of Asc Node:      163.89488 +/-     0.000
Inclination:            29.90418 +/-     0.001
Eccentricity:         0.05357262 +/-    0.0012
Semi-Major Axis:     41.87574029 +/-    0.0181
Time of Perihelion: 2424600.9171 +/-     163.0
Perihelion:          39.63234707 +/-    0.0513
Aphelion:            44.11913352 +/-    0.0519
Period (y)              270.9892 +/-      0.18
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           40.52730145 +/-    0.0014
Ecliptic Y          -11.71477987 +/-    0.0004
Ecliptic Z            0.00732226 +/-    0.0000
Ecliptic XDOT         0.00076898 +/-    0.0000
Ecliptic YDOT         0.00215533 +/-    0.0000
Ecliptic ZDOT        -0.00131361 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.18647039 +/-    0.0013
Geocenter to KBO     41.17886370 +/-    0.0015
# Hcoef:  8.24

The following table shows the complete astrometric record for 97RX9. 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 (97RX9) followed by the observatory code and reference code for the source of the astrometry.

1997 09  07.28714  23 00 29.42   -06 20 24.2   24.0R 97RX9     675  Ca0021      
1997 09  07.43086  23 00 28.78   -06 20 29.2         97RX9     675  Ca0021      
1997 09  08.25432  23 00 25.13   -06 20 57.9         97RX9     675  Ca0021      
1997 09  08.33580  23 00 24.77   -06 21 00.9         97RX9     675  Ca0021      
1997 10  05.15420  22 58 32.74   -06 35 45.8         97RX9     675  Ca0021      
1997 10  05.22851  22 58 32.47   -06 35 48.6   24.5R 97RX9     675  Ca0021      
1997 10  05.29484  22 58 32.21   -06 35 50.9   23.5R 97RX9     675  Ca0021      
1997 10  06.15200  22 58 29.04   -06 36 17.2         97RX9     675  Ca0021      
1997 10  06.16369  22 58 28.99   -06 36 17.5   24.5R 97RX9     675  Ca0021      
1997 10  06.17683  22 58 28.94   -06 36 18.1         97RX9     675  Ca0021      
1998 06  29.49523  23 09 33.10   -05 58 22.0         97RX9     568  Ca1698      
1998 06  29.57919  23 09 33.03   -05 58 22.8         97RX9     568  Ca1698      
1998 06  30.54541  23 09 32.01   -05 58 37.0         97RX9     568  Ca1698      
2000 07  28.36931  23 19 05.54   -06 27 53.3   24.2R 97RX9     309  Cb7395      
2000 07  28.37487  23 19 05.53   -06 27 53.5   24.2R 97RX9     309  Cb7395      
2000 07  28.38641  23 19 05.49   -06 27 53.8   24.2R 97RX9     309  Cb7395      
2000 07  29.36039  23 19 02.62   -06 28 20.6   24.0R 97RX9     309  Cb7395      
2000 07  29.36594  23 19 02.61   -06 28 20.7         97RX9     309  Cb7395      
2000 07  29.37150  23 19 02.59   -06 28 20.9         97RX9     309  Cb7395      
2000 08  08.31487  23 18 29.97   -06 33 15.9   24.4R 97RX9     809  Cc2106      
2000 08  08.35153  23 18 29.83   -06 33 17.2   24.1R 97RX9     809  Cc2106      
2000 08  08.39696  23 18 29.66   -06 33 18.8   24.4R 97RX9     809  Cc2106      

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     0.62       0.00     0.79
  2   0.0004    -10.73     0.67      -0.95     0.72
  3   0.0026    -72.00     0.19      -6.52     0.64
  4   0.0029    -78.10     0.20      -7.23     0.44
  5   0.0763  -1959.68    -0.03    -183.14     0.58
  6   0.0765  -1964.47    -0.04    -184.18    -0.00
  7   0.0767  -1968.93    -0.25    -184.82    -0.24
  8   0.0790  -2022.65    -0.23    -191.00    -0.76
  9   0.0791  -2023.45    -0.29    -190.99    -0.68
 10   0.0791  -2024.37    -0.38    -191.26    -0.86
 11   0.8082   7993.48    -0.43   -1914.66    -0.41
 12   0.8085   7992.21    -0.00   -1914.99    -0.17
 13   0.8111   7972.64    -0.26   -1922.17    -0.41
 14   2.8887  15188.16    -0.25   -6894.12     0.00
 15   2.8887  15187.94    -0.18   -6894.24    -0.08
 16   2.8887  15187.27    -0.25   -6894.28    -0.03
 17   2.8914  15137.12     0.12   -6902.10     0.18
 18   2.8914  15136.94     0.24   -6902.13     0.19
 19   2.8914  15136.59     0.18   -6902.20     0.17
 20   2.9186  14570.52     0.28   -6982.22     0.08
 21   2.9187  14568.07     0.12   -6982.60    -0.02
 22   2.9188  14565.10    -0.04   -6983.07    -0.16

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.

97RX9    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        41.787    41.841    41.735
ecceobj         0.050     0.054     0.047
incobj         29.930    29.928    29.932
qmin           38.841    38.767    38.917
qmax           44.638    44.783    44.396
amean          41.616    41.675    41.566
amin           41.301    41.360    41.258
amax           41.957    42.010    41.885
emean           0.050     0.054     0.049
emin            0.039     0.043     0.038
emax            0.064     0.066     0.060
imean          29.312    29.309    29.309
imin           29.015    29.003    29.008
imax           29.639    29.625    29.624
excite_mean     0.492     0.493     0.492
fracstop        1.000     1.000     1.000
cjmean          2.772     2.772     2.772

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       181.3     188.4     186.3
kozaiamp        179.9     179.9     180.0