Orbit Fit and Astrometric record for 181874

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: 181874    
# Created Wed Dec 13 02:36:40 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   27 observations of   27
# Arc:   9.05y
# First observation: 1999/04/18
#  Last observation: 2008/05/04
# Chi-squared of fit:    77.97 DOF:   48 RMS:  0.30
# Min/Max residuals:    -0.63    1.05
# Exact a, adot, b, bdot, g, gdot:
  1.280064E-05  2.520314E-02  6.238005E-06  7.742284E-03  2.475027E-02  3.847855E-03
# 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
    2.094668 -155.025301   -0.045838    0.036693   -1.009840  2451286.716693
# Heliocentric elements and errors
Epoch:              2451286.5000  =  1999/04/18
Mean Anomaly:           26.13167 +/-     0.000
Argument of Peri:      323.40739 +/-     0.000
Long of Asc Node:      198.44386 +/-     0.000
Inclination:            17.25546 +/-     0.000
Eccentricity:         0.25221257 +/-    0.0000
Semi-Major Axis:     52.30838995 +/-    0.0000
Time of Perihelion: 2441256.0564 +/-       0.0
Perihelion:          39.11555623 +/-    0.0000
Aphelion:            65.50122366 +/-    0.0000
Period (y)              378.3252 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.48944698 +/-    0.0000
Ecliptic Y          -17.51573677 +/-    0.0000
Ecliptic Z            1.47705298 +/-    0.0000
Ecliptic XDOT         0.00081746 +/-    0.0000
Ecliptic YDOT        -0.00268487 +/-    0.0000
Ecliptic ZDOT         0.00087145 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.40571380 +/-    0.0000
Geocenter to KBO     40.40352719 +/-    0.0000
# Hcoef:  6.51

The following table shows the complete astrometric record for 181874. 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 (181874) followed by the observatory code and reference code for the source of the astrometry.

1999 04  18.21595  13 35 38.83   -07 43 05.7   23.3R 181874    695  Ca4930      
1999 04  18.28985  13 35 38.47   -07 43 02.9         181874    695  Ca4930      
1999 04  18.39569  13 35 38.00   -07 42 59.6         181874    695  Ca4930      
1999 05  06.91788  13 34 17.40   -07 33 56.4         181874    950  Ca4930      
1999 05  06.98698  13 34 17.08   -07 33 54.6         181874    950  Ca4930      
1999 05  07.03852  13 34 16.89   -07 33 53.5         181874    950  Ca4930      
1999 06  05.90772  13 32 35.04   -07 22 37.5   22.5R 181874    950  Ca5574      
1999 06  05.96142  13 32 34.92   -07 22 37.0   22.3R 181874    950  Ca5574      
1999 06  06.02073  13 32 34.79   -07 22 35.8   22.8R 181874    950  Ca5574      
2000 03  31.57214  13 42 55.79   -07 58 05.7   23.0R 181874    568  Cb1943      
2000 03  31.59545  13 42 55.70   -07 58 05.4   22.9R 181874    568  Cb1943      
2000 04  02.59146  13 42 47.13   -07 57 04.7   22.8R 181874    568  Cb1943      
2000 04  02.61753  13 42 47.01   -07 57 04.0   22.7R 181874    568  Cb1943      
2001 03  10.23447  13 50 16.34   -08 14 07.5   23.0  181874    304  Ce8605      
2001 03  10.25463  13 50 16.28   -08 14 06.9         181874    304  Ce8605      
2001 03  24.41817  13 49 25.52   -08 07 42.0   22.8R 181874    695  Cc7487      
2001 03  24.49355  13 49 25.21   -08 07 40.0         181874    695  Cc7487      
2001 03  25.23640  13 49 22.22   -08 07 17.8   20.2  181874    304  Ce8605      
2001 03  25.26307  13 49 22.13   -08 07 17.1         181874    304  Ce8605      
2002 04  09.46928  13 54 16.50   -08 05 36.5         181874    568  Ch3078      
2002 04  09.52236  13 54 16.26   -08 05 34.9         181874    568  Ch3078      
2008 03  03.40475  14 31 01.67   -08 48 06.6         181874    695  Cy7583      
2008 03  03.51618  14 31 01.41   -08 48 04.0         181874    695  Cy7583      
2008 03  04.40158  14 30 59.67   -08 47 45.3         181874    695  Cy7583      
2008 03  05.45225  14 30 57.51   -08 47 22.8         181874    695  Cy7583      
2008 05  04.30407  14 27 15.93   -08 21 28.9         181874    695  Cz0888      
2008 05  04.33091  14 27 15.81   -08 21 28.2         181874    695  Cz0888      

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    -0.19       0.00     1.05
  2   0.0002      0.00     0.25       0.00     0.02
  3   0.0005      0.00     0.44       0.00     0.08
  4   0.0512      0.00     0.35       0.00    -0.13
  5   0.0514      0.00    -0.09       0.00    -0.23
  6   0.0515      0.00     0.31       0.00    -0.55
  7   0.1333      0.00    -0.63       0.00     0.32
  8   0.1335      0.00    -0.35       0.00    -0.08
  9   0.1336      0.00    -0.01       0.00     0.13
 10   0.9537      0.00    -0.05       0.00     0.31
 11   0.9538      0.00     0.11       0.00    -0.09
 12   0.9593      0.00    -0.18       0.00     0.37
 13   0.9593      0.00    -0.27       0.00     0.27
 14   1.8946      0.00     0.02       0.00     0.03
 15   1.8947      0.00     0.11       0.00     0.12
 16   1.9335      0.00     0.57       0.00    -0.15
 17   1.9337      0.00     0.45       0.00    -0.32
 18   1.9357      0.00    -0.47       0.00     0.28
 19   1.9358      0.00    -0.20       0.00     0.21
 20   2.9767      0.00     0.10       0.00    -0.27
 21   2.9769      0.00     0.04       0.00    -0.25
 22   8.8766      0.00     0.07       0.00    -0.06
 23   8.8769      0.00    -0.44       0.00     0.20
 24   8.8794      0.00    -0.16       0.00     0.10
 25   8.8822      0.00     0.17       0.00    -0.01
 26   9.0461      0.00     0.27       0.00    -0.17
 27   9.0462      0.00     0.28       0.00    -0.15

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.

181874    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        52.331    52.331    52.330
ecceobj         0.253     0.253     0.253
incobj         17.255    17.255    17.255
qmin           38.206    38.237    38.202
qmax           68.053    68.052    68.011
amean          52.805    52.802    52.806
amin           52.267    52.275    52.258
amax           53.434    53.424    53.445
emean           0.258     0.257     0.258
emin            0.243     0.242     0.242
emax            0.275     0.275     0.275
imean          17.340    17.345    17.339
imin           16.755    16.745    16.744
imax           17.834    17.851    17.836
excite_mean     0.394     0.394     0.394
fracstop        1.000     1.000     1.000
cjmean          3.013     3.013     3.013

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       171.1     170.6     171.3
kozaiamp        180.0     180.0     180.0