Orbit Fit and Astrometric record for 15GS55

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: 15GS55    
# Created Mon Apr 22 01:10:05 2019
# Orbit generated from Bernstein formalism
# Fitting   36 observations of   36
# Arc:   2.35y
# First observation: 2015/02/17
#  Last observation: 2017/06/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.000101   0.027647  -0.000000   0.012676   0.027354   0.000000
# Chi-squared of fit:     5.77 DOF:   66 RMS:  0.07
# Min/Max residuals:    -0.16    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.575146E-05  2.744199E-02  7.656302E-06  1.257505E-02  2.731968E-02 -2.881717E-03
# Covariance matrix:
  1.6231E-13  5.8940E-15 -1.0059E-14  4.2790E-14  1.3204E-13  1.7589E-12
  5.8940E-15  2.6971E-13 -2.9284E-14  1.3548E-13  1.7395E-13  5.6067E-12
 -1.0059E-14 -2.9284E-14  8.7062E-14 -8.5372E-14 -2.7310E-14 -9.4209E-13
  4.2790E-14  1.3548E-13 -8.5372E-14  1.9946E-13  1.2184E-13  4.3880E-12
  1.3204E-13  1.7395E-13 -2.7310E-14  1.2184E-13  2.4925E-13  5.0277E-12
  1.7589E-12  5.6067E-12 -9.4209E-13  4.3880E-12  5.0277E-12  1.8169E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.423052 -155.661852    0.817114    0.023416   -0.550071  2457071.085238
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          331.77171 +/-     0.068
Argument of Peri:       47.36319 +/-     0.115
Long of Asc Node:      197.89987 +/-     0.000
Inclination:            24.80061 +/-     0.001
Eccentricity:         0.19669487 +/-    0.0003
Semi-Major Axis:     44.34182227 +/-    0.0067
Time of Perihelion: 2465527.1989 +/-      20.3
Perihelion:          35.62001322 +/-    0.0158
Aphelion:            53.06363131 +/-    0.0169
Period (y)              295.2762 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -34.16199324 +/-    0.0006
Ecliptic Y          -14.55397492 +/-    0.0003
Ecliptic Z            1.54779759 +/-    0.0000
Ecliptic XDOT         0.00144116 +/-    0.0000
Ecliptic YDOT        -0.00237041 +/-    0.0000
Ecliptic ZDOT         0.00124697 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.16524783 +/-    0.0006
Geocenter to KBO     36.60364781 +/-    0.0007
# Hcoef:  7.18

The following table shows the complete astrometric record for 15GS55. 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 (15GS55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.58446  13 33 44.452  -07 10 50.06  22.8r 15GS55    568  C~2lVC      
2015 02  17.62541  13 33 44.362  -07 10 49.05  22.7r 15GS55    568  C~2lVC      
2015 02  20.61856  13 33 37.522  -07 09 35.32  22.8r 15GS55    568  C~2lVC      
2015 03  18.56698  13 32 08.899  -06 56 21.68  22.7r 15GS55    568  C~2lVC      
2015 03  18.60819  13 32 08.723  -06 56 20.15  22.8r 15GS55    568  C~2lVC      
2015 03  18.61429  13 32 08.695  -06 56 20.04  22.8r 15GS55    568  C~2lVC      
2015 03  20.57112  13 32 00.268  -06 55 11.54  22.6r 15GS55    568  C~2lVC      
2015 04  11.50547  13 30 16.715  -06 41 48.14  22.6r 15GS55    568  C~2lVC      
2015 04  13.36971  13 30 07.494  -06 40 38.90  22.7r 15GS55    568  C~2lVC      
2015 04  13.41068  13 30 07.291  -06 40 37.35  22.7r 15GS55    568  C~2lVC      
2015 04  13.51324  13 30 06.775  -06 40 33.61  22.7r 15GS55    568  C~2lVC      
2015 04  18.28263  13 29 43.17   -06 37 37.6         15GS55    W84  C~2zsP      
2015 04  19.41044  13 29 37.602  -06 36 56.79  22.6r 15GS55    568  C~2lVC      
2015 04  19.52742  13 29 37.017  -06 36 52.60  22.8r 15GS55    568  C~2lVC      
2015 04  21.27507  13 29 28.41   -06 35 48.5   23.1V 15GS55    W84  C~2zsP      
2015 04  22.27474  13 29 23.52   -06 35 12.6         15GS55    W84  C~2zsP      
2015 05  18.33311  13 27 26.017  -06 20 59.16  22.8r 15GS55    568  C~2lVC      
2015 06  20.28316  13 25 55.625  -06 09 46.69  22.8r 15GS55    568  C~2lVC      
2015 06  20.32394  13 25 55.564  -06 09 46.18  22.8r 15GS55    568  C~2lVC      
2015 07  14.28011  13 25 50.247  -06 08 02.13  22.9r 15GS55    568  C~2lVC      
2015 07  20.27306  13 25 57.690  -06 08 29.28  22.8r 15GS55    568  C~2lVC      
2016 02  04.57962  13 41 01.772  -07 09 26.58  22.9w 15GS55    568  C~2lVC      
2016 02  10.56746  13 40 55.896  -07 07 35.51  23.0w 15GS55    568  C~2lVC      
2016 03  11.54839  13 39 37.060  -06 53 58.83  22.9w 15GS55    568  C~2lVC      
2016 04  03.44935  13 37 56.527  -06 40 25.57  22.9w 15GS55    568  C~2lVC      
2016 04  09.43049  13 37 27.295  -06 36 43.89  22.8w 15GS55    568  C~2lVC      
2016 05  02.31529  13 35 35.016  -06 23 05.75  22.9w 15GS55    568  C~2lVC      
2016 05  06.32506  13 35 16.357  -06 20 53.68  22.9w 15GS55    568  C~2lVC      
2016 05  28.29220  13 33 47.683  -06 10 34.80  22.9w 15GS55    568  C~2lVC      
2016 05  28.30434  13 33 47.642  -06 10 34.53  22.9w 15GS55    568  C~2lVC      
2016 05  29.31127  13 33 44.275  -06 10 11.25  22.9w 15GS55    568  C~2lVC      
2016 06  04.36963  13 33 25.611  -06 08 01.83  22.9w 15GS55    568  C~2lVC      
2016 07  07.28742  13 32 39.435  -06 02 17.13  23.0w 15GS55    568  C~2lVC      
2017 02  27.63752  13 47 21.886  -06 53 57.10        15GS55    568  C~2lVC      
2017 02  27.65749  13 47 21.832  -06 53 56.66        15GS55    568  C~2lVC      
2017 06  24.29923  13 39 44.716  -05 57 15.32  23.1w 15GS55    568  C~2lVC      

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     0.03       0.00    -0.08
  2   0.0001     -1.62     0.04       0.45    -0.04
  3   0.0083   -123.31     0.01      31.90    -0.05
  4   0.0793  -1641.50     0.01     288.07    -0.06
  5   0.0795  -1644.50     0.01     288.53     0.04
  6   0.0795  -1644.93     0.03     288.48    -0.06
  7   0.0848  -1786.78    -0.04     306.29    -0.09
  8   0.1449  -3516.57     0.03     488.42    -0.01
  9   0.1500  -3669.82    -0.16     502.41     0.03
 10   0.1501  -3673.20    -0.12     502.74     0.09
 11   0.1504  -3681.73    -0.08     503.40     0.04
 12   0.1634  -4073.62     0.02     538.00     0.20
 13   0.1665  -4165.81    -0.01     545.50    -0.01
 14   0.1669  -4175.46     0.06     546.19    -0.08
 15   0.1716  -4318.35    -0.14     558.71     0.28
 16   0.1744  -4399.34     0.15     565.33     0.17
 17   0.2457  -6343.16     0.03     714.82    -0.03
 18   0.3359  -7845.74     0.05     843.24    -0.04
 19   0.3360  -7846.78     0.01     843.38    -0.01
 20   0.4016  -7959.04     0.01     910.89    -0.10
 21   0.4180  -7845.69     0.03     926.61    -0.07
 22   0.9637   6035.10     0.07    2444.05    -0.01
 23   0.9801   5913.30     0.02    2516.00     0.02
 24   1.0622   4522.61    -0.05    2852.34    -0.06
 25   1.1249   2831.47     0.02    3066.78    -0.04
 26   1.1413   2345.02    -0.01    3115.02    -0.04
 27   1.2039    488.35     0.01    3267.99    -0.01
 28   1.2149    181.15     0.04    3289.59    -0.04
 29   1.2750  -1275.90     0.01    3383.37     0.00
 30   1.2751  -1276.57     0.03    3383.40    -0.01
 31   1.2778  -1331.82    -0.02    3386.73    -0.04
 32   1.2944  -1638.27     0.01    3405.53    -0.02
 33   1.3845  -2405.54    -0.01    3474.63    -0.04
 34   2.0289  10990.58    -0.05    5354.22     0.13
 35   2.0289  10989.67     0.04    5354.34     0.02
 36   2.3483   3395.40    -0.03    6067.74     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.

15GS55    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        43.927    43.940    43.914
ecceobj         0.191     0.192     0.191
incobj         24.903    24.903    24.903
qmin           34.427    34.307    34.375
qmax           54.273    54.561    54.380
amean          44.189    44.186    44.191
amin           43.798    43.797    43.785
amax           44.643    44.666    44.662
emean           0.197     0.198     0.197
emin            0.179     0.184     0.174
emax            0.217     0.223     0.219
imean          25.044    25.028    25.043
imin           24.420    24.343    24.554
imax           25.508    25.516    25.564
excite_mean     0.467     0.467     0.467
fracstop        1.000     1.000     1.000
cjmean          2.834     2.834     2.834

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       182.4     179.9     185.2
kozaiamp        179.9     180.0     179.9