Orbit Fit and Astrometric record for 15GL55

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: 15GL55    
# Created Sun Apr 21 01:10:05 2019
# Orbit generated from Bernstein formalism
# Fitting   37 observations of   37
# Arc:   2.11y
# First observation: 2015/02/17
#  Last observation: 2017/03/30
Preliminary a, adot, b, bdot, g, gdot:
  -0.000149   0.024230   0.000008  -0.004714   0.024425   0.000000
# Chi-squared of fit:     2.08 DOF:   68 RMS:  0.04
# Min/Max residuals:    -0.09    0.10
# Exact a, adot, b, bdot, g, gdot:
  1.552264E-05  2.410500E-02 -3.230076E-06 -4.682882E-03  2.448890E-02  3.502527E-04
# Covariance matrix:
  1.8304E-13  1.9913E-14  1.8521E-15 -2.4296E-14  1.7329E-13  3.5340E-12
  1.9913E-14  2.9862E-13  7.2787E-15 -6.0027E-14  2.2971E-13  8.6503E-12
  1.8521E-15  7.2787E-15  9.0691E-14 -8.0901E-14  6.7324E-15  4.1479E-13
 -2.4296E-14 -6.0027E-14 -8.0901E-14  1.4106E-13 -6.6522E-14 -3.1486E-12
  1.7329E-13  2.2971E-13  6.7324E-15 -6.6522E-14  3.5249E-13  9.6262E-12
  3.5340E-12  8.6503E-12  4.1479E-13 -3.1486E-12  9.6262E-12  4.5275E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.876035 -154.127092    0.831452    0.026664   -0.527995  2457071.097458
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          356.84730 +/-     0.821
Argument of Peri:      168.87532 +/-     0.922
Long of Asc Node:       39.10675 +/-     0.001
Inclination:            11.28344 +/-     0.001
Eccentricity:         0.05675291 +/-    0.0001
Semi-Major Axis:     43.85854654 +/-    0.0029
Time of Perihelion: 2457999.5932 +/-     242.0
Perihelion:          41.36944653 +/-    0.0039
Aphelion:            46.34764654 +/-    0.0042
Period (y)              290.4622 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.53669332 +/-    0.0009
Ecliptic Y          -17.27947273 +/-    0.0004
Ecliptic Z            2.04876757 +/-    0.0001
Ecliptic XDOT         0.00111353 +/-    0.0000
Ecliptic YDOT        -0.00245890 +/-    0.0000
Ecliptic ZDOT        -0.00052083 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.37367486 +/-    0.0008
Geocenter to KBO     40.83482881 +/-    0.0010
# Hcoef:  7.51

The following table shows the complete astrometric record for 15GL55. 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 (15GL55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.59668  13 40 09.842  -07 18 54.58  23.3r 15GL55    568  C~2lVB      
2015 02  17.63771  13 40 09.756  -07 18 54.12  23.3r 15GL55    568  C~2lVB      
2015 02  20.63083  13 40 03.308  -07 18 13.64  23.8r 15GL55    568  C~2lVB      
2015 03  18.57516  13 38 40.362  -07 10 07.57  23.5r 15GL55    568  C~2lVB      
2015 03  18.62254  13 38 40.173  -07 10 06.47  23.5r 15GL55    568  C~2lVB      
2015 03  20.57938  13 38 32.290  -07 09 22.21  23.7r 15GL55    568  C~2lVB      
2015 04  11.51365  13 36 55.088  -07 00 33.73  23.3r 15GL55    568  C~2lVB      
2015 04  13.37789  13 36 46.392  -06 59 47.91  23.7r 15GL55    568  C~2lVB      
2015 04  13.41891  13 36 46.201  -06 59 46.88  23.3r 15GL55    568  C~2lVB      
2015 04  13.42365  13 36 46.167  -06 59 46.82  23.3r 15GL55    568  C~2lVB      
2015 04  13.42846  13 36 46.148  -06 59 46.68  23.3r 15GL55    568  C~2lVB      
2015 04  13.43331  13 36 46.133  -06 59 46.57  23.3r 15GL55    568  C~2lVB      
2015 04  13.43815  13 36 46.099  -06 59 46.41  23.4r 15GL55    568  C~2lVB      
2015 04  13.52145  13 36 45.701  -06 59 44.39  23.5r 15GL55    568  C~2lVB      
2015 04  19.48929  13 36 17.766  -06 57 19.24  23.2r 15GL55    568  C~2lVB      
2015 04  19.53630  13 36 17.545  -06 57 18.07  23.0r 15GL55    568  C~2lVB      
2015 04  19.56015  13 36 17.431  -06 57 17.62  23.5r 15GL55    568  C~2lVB      
2015 06  22.33610  13 32 35.374  -06 41 19.76  23.5r 15GL55    568  C~2lVB      
2015 07  14.28829  13 32 24.293  -06 42 49.42  24.2r 15GL55    568  C~2lVB      
2015 07  20.28135  13 32 28.642  -06 43 57.40  23.4r 15GL55    568  C~2lVB      
2016 02  04.60621  13 45 16.899  -08 05 41.47  24.0w 15GL55    568  C~2lVB      
2016 02  11.58929  13 45 09.457  -08 04 51.23  23.7w 15GL55    568  C~2lVB      
2016 03  11.59678  13 43 55.321  -07 57 36.67  23.7w 15GL55    568  C~2lVB      
2016 04  03.46957  13 42 20.884  -07 49 02.19  23.8w 15GL55    568  C~2lVB      
2016 04  09.45073  13 41 53.385  -07 46 37.29  23.9w 15GL55    568  C~2lVB      
2016 05  01.45743  13 40 11.057  -07 37 58.98  23.8w 15GL55    568  C~2lVB      
2016 05  01.46152  13 40 11.033  -07 37 58.79  23.6w 15GL55    568  C~2lVB      
2016 05  02.33152  13 40 07.128  -07 37 39.82  24.0w 15GL55    568  C~2lVB      
2016 05  02.33557  13 40 07.106  -07 37 39.67  23.7w 15GL55    568  C~2lVB      
2016 05  02.36396  13 40 06.974  -07 37 39.05  23.9w 15GL55    568  C~2lVB      
2016 05  07.33487  13 39 44.962  -07 35 53.01  23.8w 15GL55    568  C~2lVB      
2016 05  07.33893  13 39 44.946  -07 35 52.92  24.0w 15GL55    568  C~2lVB      
2016 05  29.33959  13 38 19.896  -07 29 32.41  24.0w 15GL55    568  C~2lVB      
2016 06  04.40200  13 38 01.219  -07 28 19.32  23.7w 15GL55    568  C~2lVB      
2016 06  27.33817  13 37 15.213  -07 26 16.99  23.7w 15GL55    568  C~2lVB      
2016 07  07.32804  13 37 08.774  -07 26 46.00  23.7w 15GL55    568  C~2lVB      
2017 03  30.48771  13 47 33.193  -08 35 58.58        15GL55    568  C~2lVB      

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     0.01       0.00     0.04
  2   0.0001     -1.36     0.04      -0.03    -0.02
  3   0.0083   -105.44     0.05       3.10     0.02
  4   0.0793  -1431.98    -0.04      10.46    -0.02
  5   0.0795  -1435.00    -0.01      10.46     0.03
  6   0.0848  -1560.40    -0.08       9.30    -0.02
  7   0.1449  -3100.68     0.09     -21.98    -0.00
  8   0.1500  -3237.98     0.02     -26.22     0.01
  9   0.1501  -3241.01     0.07     -26.29     0.06
 10   0.1501  -3241.50    -0.07     -26.41    -0.06
 11   0.1501  -3241.81    -0.02     -26.39    -0.02
 12   0.1501  -3242.06     0.09     -26.37     0.02
 13   0.1501  -3242.59    -0.07     -26.40    -0.00
 14   0.1504  -3248.85    -0.09     -26.67    -0.03
 15   0.1667  -3689.22    -0.03     -42.25    -0.00
 16   0.1668  -3692.71    -0.01     -42.35     0.04
 17   0.1669  -3694.46     0.02     -42.55    -0.08
 18   0.3415  -7126.05     0.03    -353.32    -0.01
 19   0.4016  -7247.22     0.02    -497.09    -0.03
 20   0.4180  -7162.00    -0.02    -536.78     0.03
 21   0.9637   5269.32     0.00    -978.78     0.01
 22   0.9829   5148.06    -0.05    -971.44    -0.01
 23   1.0623   3963.71    -0.04    -960.42     0.08
 24   1.1249   2469.02     0.00    -984.31    -0.02
 25   1.1413   2035.53     0.07    -996.14     0.05
 26   1.2015    429.80     0.05   -1060.79    -0.01
 27   1.2015    429.40    -0.05   -1060.74     0.05
 28   1.2039    368.41     0.10   -1064.00    -0.05
 29   1.2039    368.05     0.03   -1063.98    -0.01
 30   1.2040    365.99     0.00   -1064.11    -0.02
 31   1.2176     22.51    -0.04   -1083.35     0.00
 32   1.2176     22.25    -0.01   -1083.35     0.02
 33   1.2779  -1294.52     0.01   -1185.69    -0.04
 34   1.2945  -1579.93     0.01   -1218.08    -0.02
 35   1.3573  -2262.12    -0.06   -1351.90     0.01
 36   1.3846  -2340.88    -0.03   -1413.65     0.04
 37   2.1133   7810.63    -0.00   -1953.87    -0.02

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.

15GL55    quality flag:3

Type:         7:4EII    7:4EII    7:4EII

axisobj        43.443    43.452    43.434
ecceobj         0.048     0.048     0.048
incobj         11.322    11.323    11.322
qmin           40.869    40.836    40.790
qmax           46.776    46.810    46.850
amean          43.727    43.726    43.726
amin           43.387    43.386    43.381
amax           44.071    44.080    44.083
emean           0.032     0.040     0.040
emin            0.004     0.016     0.013
emax            0.062     0.062     0.063
imean          10.558    10.451    10.482
imin            9.886     9.754     9.787
imax           11.174    11.146    11.176
excite_mean     0.187     0.186     0.186
fracstop        1.000     1.000     1.000
cjmean          3.056     3.056     3.056

libcent 0       167.2     170.6     178.9
libamp  0        69.2      73.7      65.3
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       216.4     160.2     193.7
kozaiamp        180.0     179.9     180.0