Orbit Fit and Astrometric record for 99HJ12

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: 99HJ12    
# Created Tue Dec 19 02:37:00 2017
# Orbit generated from Bernstein formalism
# Fitting   29 observations of   29
# Arc:  15.99y
# First observation: 1999/04/18
#  Last observation: 2015/04/15
Preliminary a, adot, b, bdot, g, gdot:
  -0.001104   0.022847   0.000003  -0.000225   0.023165   0.000000
# Chi-squared of fit:    92.35 DOF:   52 RMS:  0.32
# Min/Max residuals:    -0.58    0.74
# Exact a, adot, b, bdot, g, gdot:
  1.375831E-05  2.157660E-02 -3.719302E-06 -2.195846E-04  2.314001E-02 -7.819806E-04
# Covariance matrix:
  2.4555E-13 -8.1171E-14  1.4833E-15  5.7005E-16  2.1722E-13 -1.7843E-13
 -8.1171E-14  9.3075E-14  6.6777E-16 -8.9986E-16 -3.9649E-17  2.4103E-13
  1.4833E-15  6.6777E-16  6.5196E-14 -5.5988E-15  3.7623E-15  2.1446E-15
  5.7005E-16 -8.9986E-16 -5.5988E-15  2.0640E-15 -3.2674E-16 -2.4156E-15
  2.1722E-13 -3.9649E-17  3.7623E-15 -3.2674E-16  4.0100E-13  4.0000E-14
 -1.7843E-13  2.4103E-13  2.1446E-15 -2.4156E-15  4.0000E-14  6.4227E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.610373 -140.044860    0.214790    0.079204   -0.985335  2451286.843043
# Heliocentric elements and errors
Epoch:              2451280.5000  =  1999/04/12
Mean Anomaly:          235.86759 +/-     0.081
Argument of Peri:      226.01387 +/-     0.071
Long of Asc Node:      122.58997 +/-     0.002
Inclination:             4.54246 +/-     0.000
Eccentricity:         0.05289370 +/-    0.0001
Semi-Major Axis:     42.84498982 +/-    0.0046
Time of Perihelion: 2486601.3534 +/-      22.5
Perihelion:          40.57875998 +/-    0.0051
Aphelion:            45.11121965 +/-    0.0055
Period (y)              280.4518 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -33.90646392 +/-    0.0009
Ecliptic Y          -28.13242757 +/-    0.0007
Ecliptic Z            3.47348163 +/-    0.0001
Ecliptic XDOT         0.00170606 +/-    0.0000
Ecliptic YDOT        -0.00189025 +/-    0.0000
Ecliptic ZDOT        -0.00003331 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.19442104 +/-    0.0008
Geocenter to KBO     43.21518867 +/-    0.0012
# Hcoef:  7.39

The following table shows the complete astrometric record for 99HJ12. 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 (99HJ12) followed by the observatory code and reference code for the source of the astrometry.

1999 04  18.34230  14 36 05.79   -10 25 14.5   23.6R 99HJ12    695  Ca5574      
1999 04  18.42194  14 36 05.39   -10 25 13.4         99HJ12    695  Ca5574      
1999 04  18.45872  14 36 05.28   -10 25 12.1         99HJ12    695  Ca5574      
1999 05  21.29484  14 33 40.97   -10 13 52.6   23.4R 99HJ12    697  Cb0831      
1999 05  21.33819  14 33 40.81   -10 13 51.6   23.5R 99HJ12    697  Cb0831      
1999 05  23.23208  14 33 33.00   -10 13 19.0         99HJ12    697  Cb0831      
1999 05  23.28294  14 33 32.74   -10 13 17.8   23.7R 99HJ12    697  Cb0831      
1999 05  24.23681  14 33 28.84   -10 13 01.3   23.8R 99HJ12    697  Cb0831      
1999 05  24.27640  14 33 28.67   -10 13 00.5   23.6R 99HJ12    697  Cb0831      
1999 06  05.93830  14 32 40.24   -10 09 47.9   23.0R 99HJ12    950  Ca5574      
1999 06  05.98205  14 32 40.07   -10 09 47.1   22.9R 99HJ12    950  Ca5574      
1999 06  06.03698  14 32 39.87   -10 09 46.8         99HJ12    950  Ca5574      
2000 06  07.31621  14 37 16.57   -10 32 57.8         99HJ12    568  Cb5145      
2000 06  07.40621  14 37 16.25   -10 32 56.6         99HJ12    568  Cb5145      
2000 06  08.38395  14 37 12.85   -10 32 44.5         99HJ12    568  Cb5145      
2000 06  25.96084  14 36 21.57   -10 30 04.9         99HJ12    950  Cb6477      
2000 06  25.99467  14 36 21.50   -10 30 04.3         99HJ12    950  Cb6477      
2000 06  26.03763  14 36 21.38   -10 30 04.1         99HJ12    950  Cb6477      
2001 03  24.42701  14 47 11.52   -11 20 26.3   23.5R 99HJ12    695  Cc7487      
2001 03  24.50156  14 47 11.29   -11 20 24.6         99HJ12    695  Cc7487      
2001 05  19.42791  14 43 17.94   -11 01 19.6   23.3R 99HJ12    568  Ce6450      
2001 05  19.43608  14 43 17.89   -11 01 19.7         99HJ12    568  Ce6450      
2001 05  19.52358  14 43 17.52   -11 01 17.9         99HJ12    568  Ce6450      
2001 05  19.53175  14 43 17.49   -11 01 17.4         99HJ12    568  Ce6450      
2001 05  20.45474  14 43 13.53   -11 01 01.3         99HJ12    568  Ce6450      
2001 05  20.46290  14 43 13.49   -11 01 01.1         99HJ12    568  Ce6450      
2015 04  15.36913  15 55 20.22   -16 07 45.9   24.2R 99HJ12    695  C~1RHL      
2015 04  15.40690  15 55 20.09   -16 07 45.4         99HJ12    695  C~1RHL      
2015 04  15.44534  15 55 19.93   -16 07 44.1         99HJ12    695  C~1RHL      

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     0.20       0.00     0.74
  2   0.0002     -5.95    -0.29      -0.78    -0.13
  3   0.0003     -7.90     0.29      -0.05     0.56
  4   0.0902  -2243.30    -0.22     -16.39    -0.12
  5   0.0903  -2245.85     0.05     -16.18     0.21
  6   0.0955  -2365.57     0.72     -21.16    -0.33
  7   0.0957  -2369.59    -0.04     -21.22    -0.24
  8   0.0983  -2429.45    -0.01     -23.50    -0.14
  9   0.0984  -2432.08    -0.13     -23.52    -0.05
 10   0.1330  -3171.60    -0.30     -63.83    -0.06
 11   0.1332  -3174.24    -0.54     -63.85     0.10
 12   0.1333  -3177.14    -0.43     -64.49    -0.32
 13   1.1389   1136.13     0.62    -117.34    -0.56
 14   1.1391   1131.27     0.63    -117.66    -0.49
 15   1.1418   1079.84     0.53    -121.65    -0.58
 16   1.1899    311.31    -0.05    -203.96    -0.04
 17   1.1900    310.14    -0.02    -203.71     0.39
 18   1.1901    308.40    -0.24    -204.07     0.27
 19   1.9332  10357.95    -0.09    -155.13    -0.03
 20   1.9334  10354.20     0.04    -154.53     0.31
 21   2.0865   6728.59    -0.13    -103.34     0.12
 22   2.0865   6727.92    -0.25    -103.66    -0.18
 23   2.0867   6722.17    -0.13    -103.60     0.08
 24   2.0868   6721.60    -0.16    -103.26     0.44
 25   2.0893   6661.10     0.01    -105.68     0.02
 26   2.0893   6660.47    -0.07    -105.67     0.05
 27  15.9919  75455.18     0.04    -749.37    -0.25
 28  15.9920  75452.98     0.22    -749.32    -0.25
 29  15.9921  75450.09    -0.25    -748.54     0.47

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.

99HJ12    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        42.813    42.827    42.800
ecceobj         0.052     0.052     0.053
incobj          4.543     4.543     4.543
qmin           39.714    39.840    39.734
qmax           46.748    46.623    46.699
amean          43.130    43.129    43.105
amin           42.796    42.787    42.765
amax           43.489    43.494    43.462
emean           0.058     0.056     0.057
emin            0.037     0.037     0.036
emax            0.076     0.073     0.075
imean           3.558     3.546     3.549
imin            2.477     2.476     2.473
imax            4.591     4.549     4.569
excite_mean     0.085     0.084     0.085
fracstop        1.000     1.000     1.000
cjmean          3.082     3.083     3.082

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       180.0     177.4     178.6
kozaiamp        180.0     180.0     180.0