Orbit Fit and Astrometric record for 03QK91

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: 03QK91    
# Created Sun Apr 20 01:39:45 2014
# Orbit generated from Bernstein formalism
# Fitting   18 observations of   18
# Arc:   4.79y
# First observation: 2003/08/25
#  Last observation: 2008/06/07
Preliminary a, adot, b, bdot, g, gdot:
  -0.000301   0.029830  -0.000018   0.001700   0.024911   0.000000
# Chi-squared of fit:   153.18 DOF:   30 RMS:  0.52
# Min/Max residuals:    -1.52    1.04
# Exact a, adot, b, bdot, g, gdot:
  1.874895E-05  2.908798E-02  1.526971E-06  1.667379E-03  2.530989E-02 -5.317502E-03
# Covariance matrix:
  2.2954E-13 -1.6376E-13  2.3407E-15 -5.1715E-15  5.3742E-15 -7.2176E-13
 -1.6376E-13  3.2358E-13 -6.4474E-15  1.3493E-14 -6.2095E-14  1.8943E-12
  2.3407E-15 -6.4474E-15  1.8843E-13 -5.5190E-14  1.8516E-15 -4.0624E-14
 -5.1715E-15  1.3493E-14 -5.5190E-14  2.8603E-14  1.8952E-16  9.0648E-14
  5.3742E-15 -6.2095E-14  1.8516E-15  1.8952E-16  2.7347E-13 -3.7037E-14
 -7.2176E-13  1.8943E-12 -4.0624E-14  9.0648E-14 -3.7037E-14  1.2638E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.411353  -48.510067   -0.345365    0.040211   -0.953778  2452876.630013
# Heliocentric elements and errors
Epoch:              2452870.5000  =  2003/08/19
Mean Anomaly:          347.37107 +/-     0.008
Argument of Peri:       69.44938 +/-     0.022
Long of Asc Node:      276.14179 +/-     0.003
Inclination:             4.01735 +/-     0.000
Eccentricity:         0.42673160 +/-    0.0001
Semi-Major Axis:     67.06391210 +/-    0.0122
Time of Perihelion: 2459907.6344 +/-       4.1
Perihelion:          38.44562144 +/-    0.0097
Aphelion:            95.68220275 +/-    0.0186
Period (y)              549.2139 +/-      0.15
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           27.04077070 +/-    0.0005
Ecliptic Y          -30.05198881 +/-    0.0006
Ecliptic Z            1.66239360 +/-    0.0000
Ecliptic XDOT         0.00196597 +/-    0.0000
Ecliptic YDOT         0.00251500 +/-    0.0000
Ecliptic ZDOT         0.00015618 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.46095481 +/-    0.0006
Geocenter to KBO     39.51024810 +/-    0.0008
# Hcoef:  6.63

The following table shows the complete astrometric record for 03QK91. 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 (03QK91) followed by the observatory code and reference code for the source of the astrometry.

2003 08  25.12927  20 53 02.29   -15 00 59.6   21.8R 03QK91    807  Ci4137      
2003 08  26.02489  20 52 58.36   -15 01 15.9         03QK91    807  Ci4137      
2003 08  26.12384  20 52 57.92   -15 01 17.7         03QK91    807  Ci4137      
2003 10  01.22477  20 50 56.45   -15 10 26.5   23.1R 03QK91    568  Ci6964      
2003 10  01.30181  20 50 56.29   -15 10 27.5         03QK91    568  Ci6964      
2003 10  02.22040  20 50 54.47   -15 10 37.4         03QK91    568  Ci6964      
2004 08  12.11446  21 00 31.29   -14 23 42.2   21.8R 03QK91    807  Cn7007      
2004 08  12.21694  21 00 30.79   -14 23 44.3         03QK91    807  Cn7007      
2005 06  09.24825  21 11 17.32   -13 33 29.0   22.5R 03QK91    304  Cn7007      
2005 06  09.28043  21 11 17.27   -13 33 29.3         03QK91    304  Cn7007      
2006 06  17.26905  21 17 31.78   -12 58 46.6   22.5R 03QK91    250  S~06Ad      
2006 06  17.33169  21 17 31.62   -12 58 47.0         03QK91    250  S~06Ad      
2006 06  17.33608  21 17 31.61   -12 58 47.0         03QK91    250  S~06Ad      
2006 06  17.34048  21 17 31.60   -12 58 47.1         03QK91    250  S~06Ad      
2007 09  11.23039  21 18 10.00   -12 47 47.6   22.5r 03QK91    695  Cv8575      
2007 09  11.29715  21 18 09.73   -12 47 48.9   22.6r 03QK91    695  Cv8575      
2008 06  07.34574  21 30 59.63   -11 44 17.3         03QK91    807  Cz1375      
2008 06  07.40408  21 30 59.54   -11 44 17.5         03QK91    807  Cz1375      

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    -0.12       0.00    -0.10
  2   0.0025    -59.22     0.10      -0.15     0.13
  3   0.0027    -65.85     0.14      -0.14     0.16
  4   0.1016  -1907.99     0.24     -50.42     0.22
  5   0.1018  -1910.49     0.25     -50.76     0.03
  6   0.1043  -1938.54     0.32     -53.16    -0.32
  7   0.9664   6881.68    -0.43     346.55     0.04
  8   0.9667   6874.11    -0.49     346.57    -0.01
  9   1.7909  16788.56    -1.52     542.21     0.04
 10   1.7910  16787.77    -1.30     542.13    -0.18
 11   2.8122  22680.29     1.00     923.80    -0.07
 12   2.8123  22677.91     1.01     924.12     0.00
 13   2.8123  22677.77     1.04     924.16     0.02
 14   2.8124  22677.60     1.04     924.11    -0.04
 15   4.0468  23419.35    -0.30    1389.54    -0.07
 16   4.0470  23415.14    -0.33    1389.47    -0.05
 17   4.7864  35571.41    -0.31    1599.18     0.13
 18   4.7865  35570.05    -0.33    1599.40     0.06

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.

03QK91    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        68.039    68.038    68.039
ecceobj         0.435     0.435     0.435
incobj          4.015     4.015     4.015
qmin           37.754    37.770    37.762
qmax           99.434    99.462    99.265
amean          67.746    67.797    67.703
amin           66.875    66.929    66.827
amax           68.931    69.005    68.891
emean           0.431     0.431     0.430
emin            0.420     0.421     0.420
emax            0.443     0.442     0.441
imean           5.765     5.766     5.760
imin            5.495     5.485     5.481
imax            6.060     6.084     6.082
excite_mean     0.442     0.443     0.442
fracstop        1.000     1.000     1.000
cjmean          3.138     3.138     3.138

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       184.1     185.1     184.0
kozaiamp        180.0     180.0     180.0