Orbit Fit and Astrometric record for 01KW76

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: 01KW76    
# Created Mon Dec 18 02:37:07 2017
# Orbit generated from Bernstein formalism
# Fitting   29 observations of   29
# Arc:   6.95y
# First observation: 2001/05/22
#  Last observation: 2008/05/05
Preliminary a, adot, b, bdot, g, gdot:
  -0.000473   0.026666   0.000197  -0.004928   0.026209   0.000000
# Chi-squared of fit:    29.36 DOF:   52 RMS:  0.18
# Min/Max residuals:    -0.43    0.44
# Exact a, adot, b, bdot, g, gdot:
  1.705191E-05  2.584099E-02 -3.528120E-06 -4.756918E-03  2.544648E-02 -4.812087E-03
# Covariance matrix:
  2.5573E-13 -8.3625E-14 -4.3952E-15  6.3628E-15  7.7138E-14 -2.1825E-13
 -8.3625E-14  7.3715E-14  8.4610E-15 -1.1500E-14  1.3410E-14  3.8880E-13
 -4.3952E-15  8.4610E-15  1.9176E-13 -4.1435E-14  5.6705E-15  5.5036E-14
  6.3628E-15 -1.1500E-14 -4.1435E-14  1.3395E-14 -6.7311E-15 -7.4193E-14
  7.7138E-14  1.3410E-14  5.6705E-15 -6.7311E-15  2.2018E-13  2.1968E-13
 -2.1825E-13  3.8880E-13  5.5036E-14 -7.4193E-14  2.1968E-13  2.5033E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.786219 -122.415758   -0.062930    0.013824   -1.016709  2452051.694693
# Heliocentric elements and errors
Epoch:              2452050.5000  =  2001/05/21
Mean Anomaly:          313.94236 +/-     0.011
Argument of Peri:      242.85464 +/-     0.016
Long of Asc Node:       61.81830 +/-     0.000
Inclination:            10.48744 +/-     0.000
Eccentricity:         0.21294915 +/-    0.0001
Semi-Major Axis:     45.72661061 +/-    0.0043
Time of Perihelion: 2466499.9437 +/-       2.7
Perihelion:          35.98916787 +/-    0.0046
Aphelion:            55.46405336 +/-    0.0061
Period (y)              309.2158 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -21.55206975 +/-    0.0004
Ecliptic Y          -34.05872896 +/-    0.0006
Ecliptic Z            0.53909800 +/-    0.0000
Ecliptic XDOT         0.00261242 +/-    0.0000
Ecliptic YDOT        -0.00105701 +/-    0.0000
Ecliptic ZDOT        -0.00051867 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.30855189 +/-    0.0006
Geocenter to KBO     39.29816908 +/-    0.0007
# Hcoef:  7.70

The following table shows the complete astrometric record for 01KW76. 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 (01KW76) followed by the observatory code and reference code for the source of the astrometry.

2001 05  22.19395  15 42 00.07   -18 51 18.1   23.0R 01KW76    807  Cd1817      
2001 05  22.27331  15 41 59.67   -18 51 17.1         01KW76    807  Cd1817      
2001 06  10.01799  15 40 26.18   -18 47 05.2   22.5R 01KW76    304  Cd1817      
2001 06  10.09275  15 40 25.82   -18 47 04.1         01KW76    304  Cd1817      
2001 08  19.01261  15 37 48.36   -18 42 30.6   22.5R 01KW76    807  Ch1324      
2001 08  20.00889  15 37 49.28   -18 42 37.3         01KW76    807  Ch1324      
2001 08  21.01634  15 37 50.39   -18 42 45.2         01KW76    807  Ch1324      
2004 07  16.09908  15 55 51.42   -20 28 02.8   22.2R 01KW76    807  Cn3087      
2004 07  16.19933  15 55 51.17   -20 28 02.3         01KW76    807  Cn3087      
2005 04  10.40906  16 09 24.04   -21 18 22.5   23.8R 01KW76    695  Cn3087      
2005 04  10.47197  16 09 23.83   -21 18 22.5         01KW76    695  Cn3087      
2005 04  11.46255  16 09 20.27   -21 18 15.8         01KW76    695  Cn3087      
2005 04  14.33991  16 09 09.58   -21 17 56.5   23.7R 01KW76    304  Cn3253      
2005 04  14.36388  16 09 09.45   -21 17 56.1         01KW76    304  Cn3253      
2005 05  12.44678  16 06 59.45   -21 13 37.1   24.0g 01KW76    568  C~0VDP      
2005 05  12.47306  16 06 59.31   -21 13 36.8   24.1g 01KW76    568  C~0VDP      
2005 05  12.50436  16 06 59.14   -21 13 36.5   23.8g 01KW76    568  C~0VDP      
2005 05  13.52691  16 06 53.79   -21 13 25.2   24.0g 01KW76    568  C~0VDP      
2005 07  31.24716  16 01 24.14   -21 01 43.8   22.9i 01KW76    568  C~0VDP      
2005 07  31.29138  16 01 24.06   -21 01 43.7   23.0i 01KW76    568  C~0VDP      
2005 07  31.33595  16 01 23.98   -21 01 43.7   23.0i 01KW76    568  C~0VDP      
2006 05  25.38517  16 12 10.52   -21 45 11.2   23.6r 01KW76    568  C~0VDP      
2006 05  25.42216  16 12 10.31   -21 45 10.8   23.5r 01KW76    568  C~0VDP      
2006 05  25.46632  16 12 10.07   -21 45 10.2   23.6r 01KW76    568  C~0VDP      
2006 05  26.45505  16 12 04.74   -21 44 59.2         01KW76    568  C~0VDP      
2007 05  15.34748  16 19 30.76   -22 20 14.0         01KW76    675  C~0VDP      
2007 05  15.35229  16 19 30.74   -22 20 13.9         01KW76    675  C~0VDP      
2008 05  05.37188  16 26 49.72   -22 53 58.4         01KW76    695  Cz0380      
2008 05  05.40317  16 26 49.55   -22 53 58.4         01KW76    695  Cz0380      

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    -0.21       0.00     0.12
  2   0.0002     -5.76     0.05      -0.31     0.04
  3   0.0515  -1355.72     0.12     -55.47    -0.13
  4   0.0517  -1360.95     0.05     -55.56     0.05
  5   0.2432  -3601.02     0.40    -302.16     0.09
  6   0.2459  -3586.75    -0.43    -305.66     0.27
  7   0.2487  -3569.58     0.00    -309.70    -0.05
  8   3.1510  12734.78    -0.03   -3141.33    -0.21
  9   3.1513  12731.23     0.43   -3141.56    -0.18
 10   3.8856  24594.93    -0.01   -3890.51    -0.05
 11   3.8858  24592.01     0.31   -3891.06    -0.39
 12   3.8885  24541.16    -0.07   -3893.65     0.08
 13   3.8964  24388.64     0.14   -3902.26     0.11
 14   3.8964  24386.76    -0.41   -3902.20     0.24
 15   3.9733  22529.16     0.04   -3986.37    -0.01
 16   3.9734  22527.16     0.03   -3986.44     0.00
 17   3.9735  22524.74    -0.02   -3986.59    -0.06
 18   3.9763  22448.24    -0.17   -3989.56    -0.08
 19   4.1918  17742.04    -0.02   -4188.00     0.07
 20   4.1919  17740.92    -0.13   -4188.13     0.05
 21   4.1920  17739.81    -0.22   -4188.35    -0.07
 22   5.0081  27215.73     0.08   -5060.59    -0.17
 23   5.0082  27212.72    -0.01   -5060.73    -0.19
 24   5.0083  27209.27     0.00   -5060.73    -0.06
 25   5.0110  27132.92     0.03   -5063.23     0.16
 26   5.9799  33754.15    -0.12   -6086.50    -0.17
 27   5.9799  33753.85    -0.04   -6086.45    -0.10
 28   6.9546  40290.91     0.16   -7130.30     0.44
 29   6.9547  40288.50     0.02   -7130.67     0.19

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.

01KW76    quality flag:2

Type:       SCATNEAR  SCATEXTD  SCATEXTD

axisobj        45.758    45.771    45.745
ecceobj         0.215     0.215     0.215
incobj         10.489    10.488    10.489
qmin           35.572    35.588    35.581
qmax           57.063    57.066    57.034
amean          46.109    46.113    46.077
amin           45.697    45.702    45.674
amax           46.635    46.620    46.590
emean           0.209     0.209     0.208
emin            0.194     0.193     0.192
emax            0.226     0.226     0.226
imean           8.847     8.868     8.813
imin            8.009     8.026     7.951
imax            9.736     9.753     9.700
excite_mean     0.259     0.260     0.258
fracstop        1.000     1.000     1.000
cjmean          3.044     3.044     3.044

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       179.6     179.6     179.9
kozaiamp        179.9     180.0     180.0