Orbit Fit and Astrometric record for 99HG12

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: 99HG12    
# Created Thu Dec 14 02:37:00 2017
# Orbit generated from Bernstein formalism
# Fitting   23 observations of   23
# Arc:  13.91y
# First observation: 1999/04/18
#  Last observation: 2013/03/14
Preliminary a, adot, b, bdot, g, gdot:
   0.002805   0.024003   0.000060  -0.000435   0.032802   0.000000
# Chi-squared of fit:    60.84 DOF:   40 RMS:  0.29
# Min/Max residuals:    -0.69    0.61
# Exact a, adot, b, bdot, g, gdot:
  1.407607E-05  2.258258E-02 -4.533206E-07 -3.986903E-04  2.374830E-02 -3.580698E-03
# Covariance matrix:
  4.8040E-13  2.2654E-14  2.2396E-15 -1.5305E-15  6.9194E-13  2.3271E-13
  2.2654E-14  4.8775E-14  1.4325E-15 -1.0334E-15  1.7431E-13  1.6167E-13
  2.2396E-15  1.4325E-15  1.2574E-13 -1.1148E-14  7.3955E-15  5.3635E-15
 -1.5305E-15 -1.0334E-15 -1.1148E-14  1.9000E-15 -5.1891E-15 -3.8392E-15
  6.9194E-13  1.7431E-13  7.3955E-15 -5.1891E-15  1.6190E-12  8.0028E-13
  2.3271E-13  1.6167E-13  5.3635E-15 -3.8392E-15  8.0028E-13  5.9826E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.118066 -155.997471   -0.062796    0.001839   -1.009590  2451286.706243
# Heliocentric elements and errors
Epoch:              2451280.5000  =  1999/04/12
Mean Anomaly:          281.09817 +/-     0.042
Argument of Peri:      270.34610 +/-     0.055
Long of Asc Node:       30.57308 +/-     0.001
Inclination:             1.02133 +/-     0.000
Eccentricity:         0.15619607 +/-    0.0000
Semi-Major Axis:     43.36747428 +/-    0.0092
Time of Perihelion: 2474143.2897 +/-       9.9
Perihelion:          36.59364506 +/-    0.0079
Aphelion:            50.14130349 +/-    0.0107
Period (y)              285.5975 +/-      0.09
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -39.35533824 +/-    0.0021
Ecliptic Y          -17.59656336 +/-    0.0009
Ecliptic Z            0.08677066 +/-    0.0000
Ecliptic XDOT         0.00143359 +/-    0.0000
Ecliptic YDOT        -0.00220169 +/-    0.0000
Ecliptic ZDOT        -0.00004679 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.11019855 +/-    0.0019
Geocenter to KBO     42.10827340 +/-    0.0023
# Hcoef:  7.18

The following table shows the complete astrometric record for 99HG12. 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 (99HG12) followed by the observatory code and reference code for the source of the astrometry.

1999 04  18.20550  13 29 03.82   -09 12 07.2   23.9R 99HG12    695  Ca5574      
1999 04  18.27939  13 29 03.46   -09 12 04.7         99HG12    695  Ca5574      
1999 04  18.38513  13 29 02.99   -09 12 02.7         99HG12    695  Ca5574      
1999 06  05.88567  13 26 02.30   -08 54 34.4   23.2R 99HG12    950  Ca5574      
1999 06  05.94422  13 26 02.12   -08 54 33.8   23.4R 99HG12    950  Ca5574      
1999 06  06.00363  13 26 01.99   -08 54 33.0   23.2R 99HG12    950  Ca5574      
2000 06  07.25364  13 30 44.41   -09 23 40.4         99HG12    568  Cb5145      
2000 06  07.38982  13 30 44.08   -09 23 38.4         99HG12    568  Cb5145      
2000 06  08.25333  13 30 42.03   -09 23 27.1         99HG12    568  Cb5145      
2001 05  29.23867  13 36 01.06   -09 55 42.4   23.3R 99HG12    695  Ci2597      
2001 05  29.33473  13 36 00.78   -09 55 40.3         99HG12    695  Ci2597      
2003 05  30.01916  13 45 53.19   -10 54 50.0   22.2R 99HG12    807  Ci2108      
2003 05  30.11167  13 45 52.88   -10 54 48.2         99HG12    807  Ci2108      
2003 05  31.05923  13 45 49.76   -10 54 31.0         99HG12    807  Ci2108      
2006 05  25.220697 14 01 26.64   -12 24 44.1         99HG12    645  C~1Qct      
2006 05  25.221526 14 01 26.64   -12 24 44.1         99HG12    645  C~1Qct      
2006 05  25.224014 14 01 26.63   -12 24 44.0         99HG12    645  C~1Qct      
2013 03  12.42354  14 44 26.29   -16 08 05.9   23.2R 99HG12    695  C~0uco      
2013 03  12.50528  14 44 26.09   -16 08 04.8         99HG12    695  C~0uco      
2013 03  13.43345  14 44 23.60   -16 07 54.3   22.9R 99HG12    695  C~0uco      
2013 03  13.46647  14 44 23.50   -16 07 54.0         99HG12    695  C~0uco      
2013 03  13.51052  14 44 23.37   -16 07 53.5         99HG12    695  C~0uco      
2013 03  14.50447  14 44 20.63   -16 07 41.6         99HG12    695  C~0uco      

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     0.04
  2   0.0002     -5.88    -0.35       0.36     0.45
  3   0.0005    -13.08     0.07      -0.34    -0.19
  4   0.1333  -2887.77     0.01     -13.96     0.56
  5   0.1334  -2890.48    -0.33     -14.39     0.17
  6   0.1336  -2892.56    -0.04     -14.36     0.24
  7   1.1391   1639.62     0.06     -97.35    -0.38
  8   1.1395   1634.34     0.14     -97.29    -0.21
  9   1.1418   1601.97     0.12     -97.91    -0.60
 10   2.1137   6702.81     0.05    -176.44     0.10
 11   2.1140   6698.19     0.27    -175.99     0.61
 12   4.1145  16160.14     0.10    -343.55     0.07
 13   4.1147  16155.20     0.10    -343.49     0.19
 14   4.1173  16105.83    -0.19    -343.79     0.11
 15   7.1020  31092.33    -0.11    -602.70    -0.69
 16   7.1020  31092.33    -0.06    -602.70    -0.69
 17   7.1020  31092.15    -0.08    -602.65    -0.64
 18  13.9007  73570.08    -0.07   -1242.45     0.20
 19  13.9009  73566.61     0.21   -1242.25     0.47
 20  13.9034  73524.48     0.09   -1242.98     0.16
 21  13.9035  73522.83     0.00   -1243.13     0.04
 22  13.9036  73520.65    -0.10   -1243.22    -0.02
 23  13.9064  73474.18    -0.08   -1243.67     0.00

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.

99HG12    quality flag:3

Type:         7:4EEE    7:4EEE    7:4EEE

axisobj        43.351    43.378    43.323
ecceobj         0.155     0.155     0.155
incobj          1.020     1.020     1.020
qmin           35.996    35.940    36.088
qmax           51.877    51.829    51.761
amean          43.727    43.727    43.727
amin           43.319    43.345    43.300
amax           44.199    44.177    44.220
emean           0.157     0.156     0.151
emin            0.139     0.124     0.122
emax            0.175     0.175     0.173
imean           1.791     1.803     3.241
imin            1.003     0.052     1.670
imax            2.866     4.334     5.972
excite_mean     0.161     0.161     0.163
fracstop        1.000     1.000     1.000
cjmean          3.067     3.067     3.066

libcent 0       177.7     181.9     183.2
libamp  0        63.0      44.2      94.7
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       197.0     188.0      96.6
kozaiamp        179.9     180.0     179.5