Orbit Fit and Astrometric record for 500838

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: 500838    
# Created Wed Oct 17 01:07:06 2018
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   37 observations of   37
# Arc:   4.07y
# First observation: 2013/03/07
#  Last observation: 2017/03/31
# Chi-squared of fit:    11.52 DOF:   68 RMS:  0.10
# Min/Max residuals:    -0.19    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.511479E-05  1.932045E-02 -1.430152E-06 -9.027111E-04  2.174214E-02 -6.867843E-04
# 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
    1.814247 -143.284659    0.756366    0.020400   -0.642793  2456359.042338
# Heliocentric elements and errors
Epoch:              2456358.5000  =  2013/03/07
Mean Anomaly:          219.32203 +/-     0.000
Argument of Peri:      292.28063 +/-     0.000
Long of Asc Node:       69.74847 +/-     0.000
Inclination:             3.19999 +/-     0.000
Eccentricity:         0.08364926 +/-    0.0000
Semi-Major Axis:     43.70087553 +/-    0.0000
Time of Perihelion: 2497592.6678 +/-       0.0
Perihelion:          40.04532950 +/-    0.0000
Aphelion:            47.35642155 +/-    0.0000
Period (y)              288.8973 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.81715848 +/-    0.0000
Ecliptic Y          -27.25924539 +/-    0.0000
Ecliptic Z            1.45607157 +/-    0.0000
Ecliptic XDOT         0.00151464 +/-    0.0000
Ecliptic YDOT        -0.00190004 +/-    0.0000
Ecliptic ZDOT        -0.00011622 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   46.64040174 +/-    0.0000
Geocenter to KBO     45.99368048 +/-    0.0000
# Hcoef:  6.82

The following table shows the complete astrometric record for 500838. 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 (500838) followed by the observatory code and reference code for the source of the astrometry.

2013 03  07.54156  14 19 57.809  -12 02 33.80  23.3r 500838    568  C~1XRZ      
2013 03  07.59862  14 19 57.675  -12 02 33.34  23.2r 500838    568  C~1XRZ      
2013 04  04.54263  14 18 26.723  -11 54 23.66  21.7r 500838    568  C~1XRZ      
2013 04  07.40318  14 18 15.437  -11 53 25.28  23.4r 500838    568  C~1XRZ      
2013 04  07.44689  14 18 15.263  -11 53 24.51  22.8r 500838    568  C~1XRZ      
2013 04  08.43552  14 18 11.300  -11 53 04.11  23.3r 500838    568  C~1XRZ      
2013 04  08.48075  14 18 11.118  -11 53 02.94  22.8r 500838    568  C~1XRZ      
2013 04  09.38210  14 18 07.486  -11 52 44.29  24.0r 500838    568  C~1XRZ      
2013 04  09.42533  14 18 07.307  -11 52 43.34  23.2r 500838    568  C~1XRZ      
2013 04  09.46848  14 18 07.137  -11 52 42.44  23.1r 500838    568  C~1XRZ      
2013 05  11.47017  14 15 52.449  -11 41 28.68  23.5r 500838    568  C~1XRZ      
2013 05  12.47149  14 15 48.347  -11 41 08.72  23.7r 500838    568  C~1XRZ      
2013 06  12.36752  14 13 59.693  -11 32 45.00  23.3r 500838    568  C~1XRZ      
2013 06  12.41250  14 13 59.565  -11 32 44.35  23.0r 500838    568  C~1XRZ      
2013 07  04.32702  14 13 15.316  -11 29 52.59        500838    568  C~1XRZ      
2013 07  06.33482  14 13 12.994  -11 29 46.26  23.1r 500838    568  C~1XRZ      
2013 08  02.26251  14 13 12.744  -11 31 04.50  23.9r 500838    568  C~1XRZ      
2013 08  05.26320  14 13 16.345  -11 31 31.79  23.7r 500838    568  C~1XRZ      
2014 02  24.58174  14 24 32.878  -12 29 09.46  23.9r 500838    568  C~1XRZ      
2014 02  25.55135  14 24 31.348  -12 29 00.23  23.3r 500838    568  C~1XRZ      
2014 02  28.51276  14 24 26.216  -12 28 29.74  23.3r 500838    568  C~1XRZ      
2014 03  28.44557  14 23 08.447  -12 21 28.07  23.7r 500838    568  C~1XRZ      
2014 04  05.41760  14 22 38.593  -12 18 53.76  23.3r 500838    568  C~1XRZ      
2014 05  22.41728  14 19 23.613  -12 02 58.06  24.0r 500838    568  C~1XRZ      
2014 05  28.38945  14 19 01.299  -12 01 14.70  23.3r 500838    568  C~1XRZ      
2014 06  26.32498  14 17 39.128  -11 55 21.16  24.2r 500838    568  C~1XRZ      
2014 07  18.29220  14 17 14.920  -11 54 18.80  23.5r 500838    568  C~1XRZ      
2015 04  25.27362  14 25 33.58   -12 36 45.4   23.8V 500838    W84  C~2g2q      
2015 04  25.34264  14 25 33.29   -12 36 43.9         500838    W84  C~2g2q      
2015 04  26.33926  14 25 29.01   -12 36 23.3         500838    W84  C~2g2q      
2016 05  29.35998  14 27 27.511  -12 50 06.86  23.9w 500838    568  C~2KOG      
2016 06  05.34506  14 27 02.948  -12 48 18.70  23.4w 500838    568  C~2KOG      
2017 02  23.64413  14 37 19.666  -13 41 12.21        500838    568  C~2KOG      
2017 02  24.65456  14 37 18.386  -13 41 04.83        500838    568  C~2KOG      
2017 03  27.64565  14 36 02.349  -13 34 28.81        500838    568  C~2KOG      
2017 03  30.53104  14 35 52.249  -13 33 39.10        500838    568  C~2KOG      
2017 03  31.47468  14 35 48.860  -13 33 22.37  23.2w 500838    568  C~2KOG      

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    -0.13       0.00     0.21
  2   0.0002      0.00     0.02       0.00    -0.12
  3   0.0767      0.00     0.16       0.00     0.22
  4   0.0845      0.00     0.03       0.00     0.01
  5   0.0846      0.00     0.08       0.00    -0.12
  6   0.0873      0.00     0.04       0.00    -0.19
  7   0.0874      0.00     0.09       0.00     0.04
  8   0.0899      0.00     0.04       0.00    -0.08
  9   0.0900      0.00     0.02       0.00    -0.03
 10   0.0901      0.00     0.14       0.00    -0.03
 11   0.1778      0.00    -0.07       0.00    -0.15
 12   0.1805      0.00     0.00       0.00    -0.08
 13   0.2651      0.00     0.00       0.00    -0.02
 14   0.2652      0.00    -0.02       0.00     0.09
 15   0.3252      0.00     0.07       0.00     0.11
 16   0.3307      0.00     0.12       0.00     0.11
 17   0.4044      0.00    -0.02       0.00     0.03
 18   0.4127      0.00     0.17       0.00     0.19
 19   0.9693      0.00     0.08       0.00    -0.08
 20   0.9720      0.00     0.08       0.00    -0.10
 21   0.9801      0.00     0.07       0.00    -0.01
 22   1.0565      0.00    -0.04       0.00    -0.15
 23   1.0784      0.00     0.16       0.00    -0.02
 24   1.2071      0.00    -0.01       0.00    -0.10
 25   1.2234      0.00     0.11       0.00    -0.00
 26   1.3026      0.00    -0.05       0.00     0.06
 27   1.3628      0.00     0.00       0.00    -0.14
 28   2.1321      0.00    -0.14       0.00    -0.00
 29   2.1322      0.00     0.01       0.00     0.05
 30   2.1350      0.00    -0.02       0.00    -0.15
 31   3.2274      0.00     0.04       0.00    -0.10
 32   3.2466      0.00     0.05       0.00    -0.08
 33   3.9674      0.00    -0.04       0.00     0.26
 34   3.9702      0.00     0.14       0.00     0.01
 35   4.0550      0.00     0.06       0.00     0.11
 36   4.0629      0.00     0.04       0.00    -0.10
 37   4.0655      0.00     0.02       0.00    -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.

500838    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.554    43.554    43.554
ecceobj         0.088     0.088     0.088
incobj          3.201     3.201     3.201
qmin           38.922    38.909    38.917
qmax           49.171    49.114    49.118
amean          43.851    43.851    43.851
amin           43.502    43.499    43.501
amax           44.237    44.227    44.238
emean           0.092     0.092     0.092
emin            0.070     0.070     0.070
emax            0.112     0.111     0.111
imean           1.609     1.610     1.609
imin            0.562     0.562     0.562
imax            2.652     2.652     2.652
excite_mean     0.097     0.097     0.097
fracstop        1.000     1.000     1.000
cjmean          3.088     3.088     3.088

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       167.3     167.3     167.2
kozaiamp        179.9     179.9     179.9