Orbit Fit and Astrometric record for 15GF55

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: 15GF55    
# Created Fri Feb 22 02:10:21 2019
# Orbit generated from Bernstein formalism
# Fitting   32 observations of   34
# Arc:   2.12y
# First observation: 2015/02/17
#  Last observation: 2017/03/31
Preliminary a, adot, b, bdot, g, gdot:
  -0.000208   0.034231   0.000004   0.003171   0.029330   0.000000
# Chi-squared of fit:    13.00 DOF:   58 RMS:  0.11
# Min/Max residuals:    -0.34    0.32
# Exact a, adot, b, bdot, g, gdot:
  1.852465E-05  3.415596E-02  1.565115E-06  3.177323E-03  2.947570E-02  5.476799E-03
# Covariance matrix:
  1.9267E-13 -3.0622E-14 -1.6296E-15  6.9865E-15  1.2948E-13  1.2572E-12
 -3.0622E-14  3.9302E-13 -8.0956E-15  3.8044E-14  1.8767E-13  6.7933E-12
 -1.6296E-15 -8.0956E-15  1.0203E-13 -8.4946E-14 -5.6970E-15 -2.0524E-13
  6.9865E-15  3.8044E-14 -8.4946E-14  1.3050E-13  2.6001E-14  9.6526E-13
  1.2948E-13  1.8767E-13 -5.6970E-15  2.6001E-14  2.3736E-13  4.6540E-12
  1.2572E-12  6.7933E-12 -2.0524E-13  9.6526E-13  4.6540E-12  1.7235E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.373174 -152.668072    0.845345    0.003443   -0.506139  2457071.019568
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:           23.96616 +/-     0.038
Argument of Peri:      323.84299 +/-     0.076
Long of Asc Node:      201.96735 +/-     0.001
Inclination:             5.31337 +/-     0.001
Eccentricity:         0.25222701 +/-    0.0003
Semi-Major Axis:     43.87944874 +/-    0.0078
Time of Perihelion: 2450002.6699 +/-      11.2
Perihelion:          32.81186664 +/-    0.0146
Aphelion:            54.94703084 +/-    0.0166
Period (y)              290.6698 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -30.97864886 +/-    0.0005
Ecliptic Y          -15.05810971 +/-    0.0002
Ecliptic Z            0.22101269 +/-    0.0000
Ecliptic XDOT         0.00100282 +/-    0.0000
Ecliptic YDOT        -0.00305665 +/-    0.0000
Ecliptic ZDOT         0.00029853 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   34.44520576 +/-    0.0005
Geocenter to KBO     33.92624873 +/-    0.0006
# Hcoef:  9.27

The following table shows the complete astrometric record for 15GF55. 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 (15GF55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.51879  13 42 01.527  -10 10 30.52  24.6r 15GF55    568  C~2lVA      
2015 02  17.55988  13 42 01.442  -10 10 29.95  24.7r 15GF55    568  C~2lVA      
2015 02  20.49066  13 41 54.848  -10 09 45.03  24.7r 15GF55    568  C~2lVA      
2015 03  18.49737  13 40 23.085  -09 59 59.71  23.1r 15GF55    568  C~2lVA      
2015 03  18.53825  13 40 22.874  -09 59 57.85  24.1r 15GF55    568  C~2lVA      
2015 03  20.54180  13 40 13.759  -09 59 01.05  24.4r 15GF55    568  C~2lVA      
2015 04  11.47664  13 38 22.783  -09 47 38.07  24.6r 15GF55    568  C~2lVA      
2015 04  12.38346  13 38 17.915  -09 47 08.78  24.9r 15GF55    568  C~2lVA      
2015 04  12.42916  13 38 17.690  -09 47 07.30  24.5r 15GF55    568  C~2lVA      
2015 04  12.47137  13 38 17.438  -09 47 05.77  24.5r 15GF55    568  C~2lVA      
2015 04  18.44198  13 37 45.348  -09 43 49.65  24.4r 15GF55    568  C~2lVA      
2015 04  18.48972  13 37 45.071  -09 43 47.96  24.1r 15GF55    568  C~2lVA      
2015 05  17.25497  13 35 20.018  -09 29 02.25  24.3r 15GF55    568  C~2lVA      
2015 05  25.39688  13 34 45.864  -09 25 32.72  24.5r 15GF55    568  C~2lVA      
2015 05  25.45500  13 34 45.645  -09 25 31.23  24.5r 15GF55    568  C~2lVA      
2015 06  21.34643  13 33 30.229  -09 17 39.46  24.9r 15GF55    568  C~2lVA      
2015 06  22.30309  13 33 28.797  -09 17 30.08  24.1r 15GF55    568  C~2lVA      
2015 07  12.29701  13 33 20.103  -09 16 17.34  25.1r 15GF55    568  C~2lVA      
2015 07  19.28682  13 33 27.039  -09 16 50.16  24.5r 15GF55    568  C~2lVA      
2016 02  04.63543  13 49 57.518  -10 44 06.49  25.1w 15GF55    568  C~2lVA      
2016 02  11.61375  13 49 51.523  -10 43 13.13  25.0w 15GF55    568  C~2lVA      
2016 03  11.61710  13 48 33.790  -10 34 40.13  24.6w 15GF55    568  C~2lVA      
2016 03  12.48956  13 48 30.315  -10 34 18.15  25.1w 15GF55    568  C~2lVA      
2016 04  03.48576  13 46 47.840  -10 23 51.65  24.7w 15GF55    568  C~2lVA      
2016 04  09.46692  13 46 16.528  -10 20 42.92  24.9w 15GF55    568  C~2lVA      
2016 05  02.35585  13 44 14.767  -10 08 34.16  24.8w 15GF55    568  C~2lVA      
2016 05  07.35921  13 43 49.308  -10 06 01.97  25.1w 15GF55    568  C~2lVA      
2016 05  29.33148  13 42 12.050  -09 56 21.23  24.7w 15GF55    568  C~2lVA      
2016 06  04.39391  13 41 50.846  -09 54 14.20  24.7w 15GF55    568  C~2lVA      
2016 06  27.31561  13 41 00.152  -09 49 04.52  24.8w 15GF55    568  C~2lVA      
2016 07  07.31185  13 40 54.303  -09 48 23.61  24.9w 15GF55    568  C~2lVA      
2017 02  27.65350  13 56 55.445  -11 09 51.66        15GF55    568  C~2lVA      
2017 03  30.51590  13 54 52.899  -10 57 16.52  24.4w 15GF55    568  C~2lVA      
2017 03  31.45116  13 54 48.273  -10 56 49.35  24.9w 15GF55    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    -0.04       0.00     0.03
  2   0.0001     -1.38     0.04       0.08     0.04
  3   0.0081   -108.37    -0.01       7.05     0.00
  4   0.0793  -1583.42 (   0.46)     65.82 (  -0.69)
  5   0.0795  -1587.00    -0.12      66.43    -0.14
  6   0.0849  -1733.08     0.01      70.91     0.00
  7   0.1450  -3509.26     0.16     115.94     0.29
  8   0.1475  -3586.96    -0.02     117.23    -0.20
  9   0.1476  -3590.60     0.32     117.41    -0.08
 10   0.1477  -3594.62    -0.02     117.49    -0.06
 11   0.1641  -4108.01    -0.08     128.67     0.05
 12   0.1642  -4112.44    -0.34     128.77     0.07
 13   0.2429  -6434.43     0.02     175.74     0.01
 14   0.2652  -6981.96     0.01     187.05     0.01
 15   0.2654  -6985.53     0.16     187.26     0.15
 16   0.3390  -8198.52    -0.17     219.82    -0.02
 17   0.3416  -8221.72     0.09     220.82    -0.09
 18   0.3964  -8368.33     0.09     241.59    -0.05
 19   0.4155  -8260.58    -0.13     248.51    -0.04
 20   0.9640   7281.95     0.04     616.80     0.14
 21   0.9831   7180.32    -0.01     635.52     0.01
 22   1.0626   5925.76     0.12     709.99    -0.14
 23   1.0649   5870.01    -0.16     712.40     0.10
 24   1.1252   4233.59     0.01     761.63     0.03
 25   1.1415   3734.48    -0.07     773.65     0.05
 26   1.2042   1795.09     0.22     813.37    -0.18
 27   1.2179   1389.55    -0.05     821.07     0.12
 28   1.2781   -159.80     0.01     848.48     0.04
 29   1.2947   -497.82    -0.05     854.56    -0.08
 30   1.3574  -1308.26     0.11     874.27    -0.02
 31   1.3848  -1403.65    -0.15     881.34    -0.08
 32   2.0291  13604.68    -0.00    1328.42    -0.01
 33   2.1136  11643.19 (  -0.09)   1407.10 (   0.51)
 34   2.1162  11569.63    -0.01    1408.74     0.05

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.

15GF55    quality flag:3

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

axisobj        43.398    43.426    43.370
ecceobj         0.244     0.245     0.243
incobj          5.332     5.332     5.332
qmin           31.716    31.632    31.881
qmax           56.282    56.374    56.296
amean          43.726    43.726    43.726
amin           43.304    43.324    43.277
amax           44.253    44.234    44.266
emean           0.257     0.260     0.239
emin            0.234     0.242     0.129
emax            0.274     0.275     0.272
imean           4.637     3.892     6.583
imin            3.405     2.826     4.067
imax            6.904     5.672    13.407
excite_mean     0.270     0.270     0.270
fracstop        1.000     1.000     1.000
cjmean          3.010     3.010     3.009

libcent 0       180.2     179.6     161.9
libamp  0        49.5      35.3      86.4
libcent 1      -180.0     166.4    -180.0
libamp  1      -180.0     154.9    -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       131.3     236.5     124.9
kozaiamp        180.0     180.0     180.0