Orbit Fit and Astrometric record for 15GH55

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: 15GH55    
# Created Thu Feb 21 02:10:16 2019
# Orbit generated from Bernstein formalism
# Fitting   36 observations of   36
# Arc:   2.11y
# First observation: 2015/02/17
#  Last observation: 2017/03/29
Preliminary a, adot, b, bdot, g, gdot:
  -0.000182   0.028050   0.000005  -0.001890   0.026122   0.000000
# Chi-squared of fit:    10.99 DOF:   66 RMS:  0.10
# Min/Max residuals:    -0.27    0.22
# Exact a, adot, b, bdot, g, gdot:
  1.672062E-05  2.791198E-02 -1.633206E-06 -1.886407E-03  2.623169E-02  1.321889E-03
# Covariance matrix:
  1.8326E-13  1.3062E-14 -2.9123E-17 -7.5360E-15  1.5541E-13  2.8583E-12
  1.3062E-14  3.2694E-13  2.3788E-15 -2.2833E-14  1.9681E-13  8.1877E-12
 -2.9123E-17  2.3788E-15  8.3062E-14 -7.5105E-14  1.1862E-15  1.1457E-13
 -7.5360E-15 -2.2833E-14 -7.5105E-14  1.3436E-13 -1.9994E-14 -9.9384E-13
  1.5541E-13  1.9681E-13  1.1862E-15 -1.9994E-14  2.7197E-13  7.3416E-12
  2.8583E-12  8.1877E-12  1.1457E-13 -9.9384E-13  7.3416E-12  3.5427E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.535948 -156.828083    0.805821    0.025226   -0.566408  2457071.077078
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:           11.50743 +/-     0.256
Argument of Peri:      131.85886 +/-     0.334
Long of Asc Node:       55.19711 +/-     0.005
Inclination:             4.55275 +/-     0.001
Eccentricity:         0.12371673 +/-    0.0002
Semi-Major Axis:     44.00077645 +/-    0.0037
Time of Perihelion: 2453662.7742 +/-      75.9
Perihelion:          38.55714429 +/-    0.0099
Aphelion:            49.44440860 +/-    0.0103
Period (y)              291.8762 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.85323894 +/-    0.0007
Ecliptic Y          -14.46818987 +/-    0.0003
Ecliptic Z            1.68668459 +/-    0.0000
Ecliptic XDOT         0.00100795 +/-    0.0000
Ecliptic YDOT        -0.00274144 +/-    0.0000
Ecliptic ZDOT        -0.00019050 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.69920109 +/-    0.0007
Geocenter to KBO     38.12182444 +/-    0.0008
# Hcoef:  8.91

The following table shows the complete astrometric record for 15GH55. 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 (15GH55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.57630  13 29 32.405  -06 38 53.67  24.6r 15GH55    568  C~2lVA      
2015 02  17.61724  13 29 32.312  -06 38 53.11  25.0r 15GH55    568  C~2lVA      
2015 02  20.61032  13 29 25.061  -06 38 03.01  24.5r 15GH55    568  C~2lVA      
2015 03  18.55881  13 27 54.670  -06 28 25.27  24.6r 15GH55    568  C~2lVA      
2015 03  18.59998  13 27 54.501  -06 28 24.17  24.6r 15GH55    568  C~2lVA      
2015 03  20.55852  13 27 46.062  -06 27 32.57  24.6r 15GH55    568  C~2lVA      
2015 04  11.49722  13 26 03.266  -06 17 25.39  24.3r 15GH55    568  C~2lVA      
2015 04  13.36151  13 25 54.180  -06 16 33.22  24.4r 15GH55    568  C~2lVA      
2015 04  13.40245  13 25 53.992  -06 16 32.27  24.4r 15GH55    568  C~2lVA      
2015 04  13.48799  13 25 53.560  -06 16 29.71  24.4r 15GH55    568  C~2lVA      
2015 04  13.50003  13 25 53.485  -06 16 29.44  24.5r 15GH55    568  C~2lVA      
2015 04  13.50498  13 25 53.485  -06 16 29.28  25.0r 15GH55    568  C~2lVA      
2015 04  19.39819  13 25 24.781  -06 13 46.58  24.6r 15GH55    568  C~2lVA      
2015 04  19.40228  13 25 24.750  -06 13 46.49  24.3r 15GH55    568  C~2lVA      
2015 04  19.51516  13 25 24.209  -06 13 43.69  24.2r 15GH55    568  C~2lVA      
2015 04  19.51922  13 25 24.159  -06 13 43.38  24.5r 15GH55    568  C~2lVA      
2015 05  18.27664  13 23 16.121  -06 02 15.71  24.6r 15GH55    568  C~2lVA      
2015 05  18.32493  13 23 15.933  -06 02 14.74  24.8r 15GH55    568  C~2lVA      
2015 06  20.27498  13 21 47.701  -05 55 52.61  24.6r 15GH55    568  C~2lVA      
2015 06  20.31583  13 21 47.637  -05 55 52.40  24.7r 15GH55    568  C~2lVA      
2015 06  22.31546  13 21 45.138  -05 55 47.62  24.5r 15GH55    568  C~2lVA      
2015 07  14.26780  13 21 41.847  -05 57 22.79  25.0r 15GH55    568  C~2lVA      
2015 07  20.29799  13 21 48.864  -05 58 36.26  24.6r 15GH55    568  C~2lVA      
2016 02  04.56329  13 35 43.356  -07 22 42.84  25.5w 15GH55    568  C~2lVA      
2016 02  10.60087  13 35 36.048  -07 21 43.67  25.4w 15GH55    568  C~2lVA      
2016 03  12.47618  13 34 09.639  -07 12 17.96  24.7w 15GH55    568  C~2lVA      
2016 04  03.43722  13 32 32.745  -07 02 41.93  24.8w 15GH55    568  C~2lVA      
2016 04  09.41702  13 32 03.876  -06 59 56.29  24.6w 15GH55    568  C~2lVA      
2016 05  01.36453  13 30 18.155  -06 50 10.15  24.6w 15GH55    568  C~2lVA      
2016 05  02.30717  13 30 13.813  -06 49 46.87  24.9w 15GH55    568  C~2lVA      
2016 05  06.31695  13 29 55.630  -06 48 10.22  24.6w 15GH55    568  C~2lVA      
2016 06  04.35340  13 28 08.311  -06 39 21.16  25.1w 15GH55    568  C~2lVA      
2016 06  27.28082  13 27 27.064  -06 37 05.38  25.1w 15GH55    568  C~2lVA      
2016 07  06.31671  13 27 23.703  -06 37 31.06  24.9w 15GH55    568  C~2lVA      
2016 07  07.28338  13 27 23.794  -06 37 36.35  25.5w 15GH55    568  C~2lVA      
2017 03  29.47339  13 38 51.868  -07 46 33.29        15GH55    568  C~2lVA      

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     0.02       0.00     0.10
  2   0.0001     -1.49     0.12       0.01     0.04
  3   0.0083   -120.39     0.04       6.81    -0.04
  4   0.0793  -1585.53    -0.15      47.41    -0.13
  5   0.0795  -1588.28    -0.02      47.51    -0.06
  6   0.0848  -1724.23    -0.03      49.06     0.04
  7   0.1449  -3372.80    -0.01      47.28     0.06
  8   0.1500  -3518.00    -0.11      45.65     0.10
  9   0.1501  -3520.96     0.18      45.50     0.00
 10   0.1503  -3527.89     0.02      45.49     0.13
 11   0.1504  -3529.03    -0.17      45.33    -0.02
 12   0.1504  -3529.09     0.17      45.48     0.14
 13   0.1665  -3987.07     0.03      38.31     0.08
 14   0.1665  -3987.53    -0.11      38.22     0.01
 15   0.1668  -3996.06     0.22      37.84    -0.17
 16   0.1669  -3996.87    -0.27      37.85    -0.15
 17   0.2456  -6026.54    -0.01     -30.97    -0.04
 18   0.2457  -6029.51     0.00     -31.11     0.01
 19   0.3359  -7395.02     0.05    -165.09    -0.04
 20   0.3360  -7395.98    -0.06    -165.25     0.01
 21   0.3415  -7432.42     0.07    -174.67    -0.06
 22   0.4016  -7442.65     0.05    -281.34    -0.21
 23   0.4181  -7318.00    -0.03    -310.66     0.05
 24   0.9637   6103.77    -0.11    -421.28     0.05
 25   0.9802   5980.85     0.17    -405.88     0.08
 26   1.0647   4576.43    -0.08    -349.23     0.19
 27   1.1249   3022.94    -0.07    -341.49     0.06
 28   1.1412   2562.27     0.00    -345.05    -0.07
 29   1.2013    882.62     0.01    -378.23     0.05
 30   1.2039    813.93     0.07    -380.37     0.03
 31   1.2149    526.54    -0.01    -390.14     0.02
 32   1.2944  -1154.64     0.06    -487.25     0.02
 33   1.3572  -1775.96    -0.09    -587.82    -0.22
 34   1.3819  -1813.03     0.09    -630.18    -0.13
 35   1.3846  -1809.82    -0.07    -634.60     0.02
 36   2.1106   9239.66     0.01    -732.82     0.04

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.

15GH55    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        43.552    43.567    43.537
ecceobj         0.114     0.115     0.114
incobj          4.561     4.561     4.561
qmin           37.187    36.640    38.046
qmax           50.856    51.183    49.889
amean          43.720    43.766    43.707
amin           43.277    43.255    43.303
amax           44.254    44.205    44.181
emean           0.122     0.111     0.099
emin            0.089     0.078     0.068
emax            0.149     0.159     0.129
imean           2.671     2.396     2.762
imin            1.314     0.350     1.784
imax            3.965     3.824     3.813
excite_mean     0.132     0.120     0.111
fracstop        1.000     1.000     1.000
cjmean          3.077     3.081     3.083

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       171.6     177.0     181.9
kozaiamp        180.0     179.9     180.0