Orbit Fit and Astrometric record for 187661

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: 187661    
# Created Sun Oct 22 01:36:39 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   45 observations of   45
# Arc:   6.08y
# First observation: 2002/04/10
#  Last observation: 2008/05/08
# Chi-squared of fit:   119.89 DOF:   84 RMS:  0.29
# Min/Max residuals:    -0.59    0.79
# Exact a, adot, b, bdot, g, gdot:
  3.040432E-05  1.175155E-01 -1.089021E-05 -5.439452E-02  7.004201E-02 -2.555479E-02
# Covariance matrix:
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00  0.0000E+00
#      lat0       lon0       xBary       yBary       zBary        JD0
   23.958516 -156.479901    0.050949    0.407294   -0.916824  2452374.914373
# Heliocentric elements and errors
Epoch:              2452374.5000  =  2002/04/10
Mean Anomaly:          344.71216 +/-     0.000
Argument of Peri:      173.51487 +/-     0.000
Long of Asc Node:       62.48667 +/-     0.000
Inclination:            33.14826 +/-     0.000
Eccentricity:         0.40420482 +/-    0.0000
Semi-Major Axis:     23.96967265 +/-    0.0000
Time of Perihelion: 2454194.7672 +/-       0.0
Perihelion:          14.28101551 +/-    0.0000
Aphelion:            33.65832980 +/-    0.0000
Period (y)              117.3549 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -12.90247338 +/-    0.0000
Ecliptic Y           -5.55524113 +/-    0.0000
Ecliptic Z            5.79748872 +/-    0.0000
Ecliptic XDOT         0.00187012 +/-    0.0000
Ecliptic YDOT        -0.00419358 +/-    0.0000
Ecliptic ZDOT        -0.00234843 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   15.19696549 +/-    0.0000
Geocenter to KBO     14.27726438 +/-    0.0000
# Hcoef:  9.17

The following table shows the complete astrometric record for 187661. 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 (187661) followed by the observatory code and reference code for the source of the astrometry.

2002 04  10.41363  14 02 31.02   +13 09 00.3   20.6R 187661    644  Cv3892      
2002 07  30.17412  13 50 43.70   +11 19 38.7   20.9R 187661    644  Cv3892      
2003 04  27.202110 14 20 04.500  +07 43 28.55  20.8V 187661    645  Cv3892      
2003 04  27.205582 14 20 04.454  +07 43 28.59  21.7  187661    645  Cv3892      
2003 04  27.336130 14 20 02.782  +07 43 31.61  21.2V 187661    645  Cv3171      
2003 04  27.339602 14 20 02.740  +07 43 31.66  22.0  187661    645  Cv3171      
2003 04  28.338120 14 19 50.124  +07 43 53.60  21.0V 187661    645  Cv3892      
2003 04  28.341592 14 19 50.078  +07 43 53.66  21.9  187661    645  Cv3892      
2004 03  30.42019  14 46 42.30   +01 33 48.4         187661    675  Cv3171      
2004 03  31.41478  14 46 32.39   +01 34 34.4         187661    675  Cv3171      
2004 04  13.26172  14 44 11.11   +01 43 34.7   20.4R 187661    675  Cv3171      
2004 04  13.33158  14 44 10.26   +01 43 37.7   20.6R 187661    675  Cv3171      
2004 04  13.40123  14 44 09.42   +01 43 40.0   20.3R 187661    675  Cv3171      
2004 04  16.28798  14 43 34.87   +01 45 25.8   20.5R 187661    675  Cv3171      
2004 04  16.35432  14 43 34.04   +01 45 28.2   21.2R 187661    675  Cv3171      
2004 04  16.41685  14 43 33.27   +01 45 30.3   20.6R 187661    675  Cv3171      
2006 04  29.29690  15 25 58.35   -10 25 04.1   20.7V 187661    691  Cv3171      
2006 04  29.31428  15 25 58.12   -10 25 03.6   20.5V 187661    691  Cv3171      
2006 04  29.33168  15 25 57.90   -10 25 03.5   20.8V 187661    691  Cv3171      
2006 05  07.26925  15 24 13.92   -10 23 40.5   20.9V 187661    691  Cv3171      
2006 05  07.28660  15 24 13.70   -10 23 40.3   20.8V 187661    691  Cv3171      
2006 05  07.30402  15 24 13.46   -10 23 40.2   20.7V 187661    691  Cv3171      
2006 05  30.25066  15 19 09.33   -10 23 01.1   20.2V 187661    G96  Cv3171      
2006 05  30.25727  15 19 09.26   -10 23 01.3   20.2V 187661    G96  Cv3171      
2006 05  30.26385  15 19 09.19   -10 23 01.5   20.4V 187661    G96  Cv3171      
2006 05  30.27043  15 19 09.08   -10 23 01.2   20.3V 187661    G96  Cv3171      
2007 04  18.44327  15 52 19.08   -16 31 59.9   20.9V 187661    691  Cv2441      
2007 04  18.46088  15 52 18.86   -16 32 00.1   21.1V 187661    691  Cv2441      
2007 04  18.47852  15 52 18.66   -16 32 00.1   21.5V 187661    691  Cv2441      
2007 04  22.45334  15 51 33.91   -16 32 11.3   20.9V 187661    691  Cv2441      
2007 04  22.47293  15 51 33.63   -16 32 11.6   20.7V 187661    691  Cv2441      
2007 04  22.49202  15 51 33.42   -16 32 11.6   21.2V 187661    691  Cv2441      
2007 05  10.35502  15 47 46.18   -16 32 32.7   20.6R 187661    675  C60235      
2007 05  10.39789  15 47 45.54   -16 32 32.5   20.5R 187661    675  C60235      
2007 05  11.28579  15 47 33.51   -16 32 33.0   20.7R 187661    675  C60235      
2007 05  11.33020  15 47 32.90   -16 32 33.3   20.5R 187661    675  C60235      
2007 05  12.36979  15 47 18.67   -16 32 33.7   20.9V 187661    691  Cv2661      
2007 05  12.38741  15 47 18.44   -16 32 33.8   21.0V 187661    691  Cv2661      
2007 05  12.40504  15 47 18.20   -16 32 33.4   21.3V 187661    691  Cv2661      
2008 03  04.53562  16 20 59.16   -21 55 21.51        187661    675  Cy2205      
2008 03  10.52644  16 21 06.64   -22 00 13.39        187661    675  Cy2205      
2008 05  08.35568  16 13 44.94   -22 29 13.9   20.0V 187661    G96  Cy9015      
2008 05  08.36194  16 13 44.90   -22 29 13.8   20.0V 187661    G96  Cy9015      
2008 05  08.36822  16 13 44.79   -22 29 14.2   20.1V 187661    G96  Cy9015      
2008 05  08.37451  16 13 44.68   -22 29 14.2   19.8V 187661    G96  Cy9015      

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    -0.57       0.00    -0.59
  2   0.3032      0.00     0.14       0.00    -0.02
  3   1.0453      0.00     0.12       0.00    -0.12
  4   1.0453      0.00     0.10       0.00    -0.16
  5   1.0456      0.00     0.17       0.00    -0.13
  6   1.0457      0.00     0.21       0.00    -0.16
  7   1.0484      0.00     0.14       0.00    -0.09
  8   1.0484      0.00     0.11       0.00    -0.11
  9   1.9713      0.00    -0.55       0.00     0.28
 10   1.9740      0.00    -0.30       0.00     0.79
 11   2.0092      0.00     0.60       0.00    -0.27
 12   2.0094      0.00     0.44       0.00     0.08
 13   2.0095      0.00     0.43       0.00    -0.26
 14   2.0175      0.00     0.49       0.00    -0.03
 15   2.0176      0.00     0.31       0.00     0.02
 16   2.0178      0.00     0.34       0.00    -0.08
 17   4.0517      0.00     0.53       0.00    -0.15
 18   4.0517      0.00     0.49       0.00     0.15
 19   4.0518      0.00     0.60       0.00     0.04
 20   4.0735      0.00     0.29       0.00     0.26
 21   4.0736      0.00     0.51       0.00     0.31
 22   4.0736      0.00     0.45       0.00     0.26
 23   4.1364      0.00    -0.19       0.00     0.02
 24   4.1365      0.00     0.04       0.00    -0.14
 25   4.1365      0.00     0.27       0.00    -0.29
 26   4.1365      0.00    -0.11       0.00     0.05
 27   5.0213      0.00     0.13       0.00    -0.08
 28   5.0213      0.00    -0.22       0.00    -0.23
 29   5.0214      0.00    -0.27       0.00    -0.17
 30   5.0323      0.00     0.28       0.00     0.30
 31   5.0323      0.00    -0.45       0.00     0.04
 32   5.0324      0.00    -0.22       0.00     0.07
 33   5.0813      0.00     0.62       0.00    -0.31
 34   5.0814      0.00    -0.10       0.00    -0.09
 35   5.0838      0.00     0.06       0.00     0.01
 36   5.0840      0.00     0.13       0.00    -0.25
 37   5.0868      0.00    -0.33       0.00     0.10
 38   5.0869      0.00    -0.10       0.00     0.01
 39   5.0869      0.00    -0.03       0.00     0.42
 40   5.9004      0.00     0.31       0.00     0.21
 41   5.9168      0.00     0.06       0.00    -0.35
 42   6.0779      0.00    -0.01       0.00    -0.02
 43   6.0779      0.00     0.67       0.00     0.17
 44   6.0779      0.00     0.30       0.00    -0.14
 45   6.0779      0.00    -0.06       0.00    -0.05

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.

187661    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        23.837    23.837    23.837
ecceobj         0.402     0.402     0.402
incobj         33.155    33.155    33.155
qmin           13.094    12.466    13.164
qmax           35.781    35.874    35.528
amean          24.072    24.078    24.073
amin           23.729    23.837    23.739
amax           24.492    24.394    24.488
emean           0.440     0.445     0.438
emin            0.402     0.402     0.402
emax            0.461     0.482     0.455
imean          30.893    30.492    31.508
imin           30.314    28.477    30.659
imax           32.059    32.059    32.439
excite_mean     0.676     0.675     0.682
fracstop        0.017     0.013     0.030
cjmean          2.621     2.622     2.614

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       177.5     159.6     178.5
kozaiamp         25.8      15.1      28.9