Orbit Fit and Astrometric record for 15GC56

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: 15GC56    
# Created Thu Feb 21 02:10:16 2019
# Orbit generated from Bernstein formalism
# Fitting   35 observations of   35
# Arc:   2.35y
# First observation: 2015/02/17
#  Last observation: 2017/06/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.000124   0.029253   0.000018  -0.015324   0.026654   0.000000
# Chi-squared of fit:     3.76 DOF:   64 RMS:  0.06
# Min/Max residuals:    -0.27    0.12
# Exact a, adot, b, bdot, g, gdot:
  1.711088E-05  2.904969E-02 -8.944168E-06 -1.525561E-02  2.668735E-02 -1.869734E-03
# Covariance matrix:
  1.4442E-13 -2.7211E-14  5.1714E-15 -2.7421E-14  9.3185E-14  9.3717E-13
 -2.7211E-14  3.1450E-13  3.9914E-14 -1.8723E-13  1.4243E-13  6.2673E-12
  5.1714E-15  3.9914E-14  9.0616E-14 -9.9054E-14  2.4294E-14  1.1661E-12
 -2.7421E-14 -1.8723E-13 -9.9054E-14  2.6242E-13 -1.1792E-13 -5.4621E-12
  9.3185E-14  1.4243E-13  2.4294E-14 -1.1792E-13  1.8022E-13  3.9713E-12
  9.3717E-13  6.2673E-12  1.1661E-12 -5.4621E-12  3.9713E-12  1.8279E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.230656 -156.723843    0.806810    0.032012   -0.564654  2457071.081158
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          355.74313 +/-     0.023
Argument of Peri:      186.41769 +/-     0.072
Long of Asc Node:       28.10357 +/-     0.000
Inclination:            27.81992 +/-     0.001
Eccentricity:         0.46879999 +/-    0.0001
Semi-Major Axis:     71.01584514 +/-    0.0121
Time of Perihelion: 2459655.2545 +/-      13.8
Perihelion:          37.72361777 +/-    0.0109
Aphelion:           104.30807250 +/-    0.0198
Period (y)              598.4682 +/-      0.15
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.20764955 +/-    0.0006
Ecliptic Y          -14.26594934 +/-    0.0002
Ecliptic Z            2.11136865 +/-    0.0000
Ecliptic XDOT         0.00126892 +/-    0.0000
Ecliptic YDOT        -0.00270239 +/-    0.0000
Ecliptic ZDOT        -0.00157330 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.04673146 +/-    0.0005
Geocenter to KBO     37.47094054 +/-    0.0006
# Hcoef:  7.33

The following table shows the complete astrometric record for 15GC56. 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 (15GC56) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.58038  13 30 57.484  -06 02 25.87  23.0r 15GC56    568  C~2lVD      
2015 02  17.62132  13 30 57.378  -06 02 25.46  23.0r 15GC56    568  C~2lVD      
2015 02  20.61441  13 30 49.620  -06 01 53.39  23.1r 15GC56    568  C~2lVD      
2015 03  18.55881  13 29 14.108  -05 54 56.69  23.0r 15GC56    568  C~2lVD      
2015 03  18.59998  13 29 13.919  -05 54 55.88  23.0r 15GC56    568  C~2lVD      
2015 03  20.56294  13 29 05.024  -05 54 16.72  23.0r 15GC56    568  C~2lVD      
2015 04  11.49722  13 27 17.010  -05 46 33.23  22.9r 15GC56    568  C~2lVD      
2015 04  13.36151  13 27 07.462  -05 45 53.61  23.0r 15GC56    568  C~2lVD      
2015 04  13.40245  13 27 07.250  -05 45 52.77  23.0r 15GC56    568  C~2lVD      
2015 04  13.48799  13 27 06.807  -05 45 51.01  22.9r 15GC56    568  C~2lVD      
2015 04  13.50003  13 27 06.744  -05 45 50.77  22.8r 15GC56    568  C~2lVD      
2015 04  13.50498  13 27 06.712  -05 45 50.58  22.9r 15GC56    568  C~2lVD      
2015 04  19.40228  13 26 36.511  -05 43 47.84  22.9r 15GC56    568  C~2lVD      
2015 04  19.51922  13 26 35.890  -05 43 45.48  23.0r 15GC56    568  C~2lVD      
2015 05  18.27664  13 24 20.436  -05 35 40.68  22.2r 15GC56    568  C~2lVD      
2015 05  18.32493  13 24 20.258  -05 35 39.94  23.1r 15GC56    568  C~2lVD      
2015 06  20.27498  13 22 44.235  -05 33 22.72  22.8r 15GC56    568  C~2lVD      
2015 06  20.31583  13 22 44.163  -05 33 22.96  23.1r 15GC56    568  C~2lVD      
2015 06  22.31959  13 22 41.226  -05 33 33.28  23.1r 15GC56    568  C~2lVD      
2015 07  14.27191  13 22 33.717  -05 37 56.77  23.2r 15GC56    568  C~2lVD      
2015 07  20.26475  13 22 39.678  -05 39 56.30  23.2r 15GC56    568  C~2lVD      
2016 02  04.56733  13 36 18.569  -07 29 02.44  23.2w 15GC56    568  C~2lVD      
2016 02  10.55526  13 36 10.314  -07 28 46.50  23.3w 15GC56    568  C~2lVD      
2016 02  10.60492  13 36 10.220  -07 28 46.21  23.3w 15GC56    568  C~2lVD      
2016 02  11.57713  13 36 08.543  -07 28 41.87  23.3w 15GC56    568  C~2lVD      
2016 03  11.55250  13 34 41.196  -07 23 13.39  23.3w 15GC56    568  C~2lVD      
2016 03  12.47618  13 34 37.398  -07 22 57.73  23.1w 15GC56    568  C~2lVD      
2016 04  03.43722  13 32 54.942  -07 15 51.90  23.2w 15GC56    568  C~2lVD      
2016 04  09.41701  13 32 24.474  -07 13 46.47  23.1w 15GC56    568  C~2lVD      
2016 06  27.28082  13 27 28.409  -06 59 33.86  23.4w 15GC56    568  C~2lVD      
2016 07  06.31671  13 27 23.467  -07 00 58.95  23.6w 15GC56    568  C~2lVD      
2016 07  07.28338  13 27 23.412  -07 01 10.82  23.2w 15GC56    568  C~2lVD      
2017 02  24.64250  13 40 37.640  -08 52 46.55        15GC56    568  C~2lVD      
2017 03  29.45933  13 38 25.063  -08 44 27.17  23.1w 15GC56    568  C~2lVD      
2017 06  24.28972  13 32 29.336  -08 24 55.96  23.2w 15GC56    568  C~2lVD      

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    -0.02
  2   0.0001     -1.62    -0.00      -0.20    -0.03
  3   0.0083   -121.03    -0.05     -12.90     0.01
  4   0.0793  -1599.35    -0.01    -149.55    -0.02
  5   0.0795  -1602.27    -0.02    -149.83    -0.03
  6   0.0848  -1740.09     0.01    -162.29     0.02
  7   0.1449  -3409.51    -0.04    -325.58    -0.00
  8   0.1500  -3556.61    -0.05    -341.34     0.05
  9   0.1501  -3559.86    -0.02    -341.73     0.04
 10   0.1503  -3566.66     0.05    -342.54     0.01
 11   0.1504  -3567.62     0.05    -342.66    -0.00
 12   0.1504  -3568.13    -0.06    -342.66     0.04
 13   0.1665  -4032.50     0.08    -395.00     0.05
 14   0.1668  -4041.99    -0.10    -396.22    -0.06
 15   0.2456  -6101.15    -0.21    -693.45    -0.27
 16   0.2457  -6103.89     0.07    -693.75     0.01
 17   0.3359  -7487.79     0.07   -1097.73     0.09
 18   0.3360  -7488.70     0.02   -1098.35     0.01
 19   0.3415  -7525.65     0.04   -1124.22     0.02
 20   0.4016  -7532.08     0.07   -1410.69     0.00
 21   0.4180  -7404.95     0.03   -1488.73     0.01
 22   0.9637   6355.92     0.06   -3085.33    -0.01
 23   0.9801   6235.68     0.12   -3115.29     0.03
 24   0.9802   6234.27    -0.00   -3115.53     0.07
 25   0.9829   6209.44    -0.01   -3120.59    -0.02
 26   1.0622   4878.95    -0.02   -3289.26     0.01
 27   1.0647   4820.60     0.03   -3295.33     0.03
 28   1.1249   3245.43    -0.03   -3456.96     0.02
 29   1.1412   2777.49    -0.02   -3506.45     0.02
 30   1.3572  -1634.90     0.03   -4335.18     0.02
 31   1.3819  -1671.90    -0.06   -4441.47    -0.03
 32   1.3845  -1668.28     0.00   -4452.81    -0.01
 33   2.0207  11779.95    -0.00   -6374.61    -0.06
 34   2.1106   9761.22    -0.03   -6621.47    -0.04
 35   2.3483   4412.42    -0.02   -7455.92     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.

15GC56    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        69.828    69.851    69.805
ecceobj         0.460     0.460     0.460
incobj         27.910    27.910    27.910
qmin           35.840    35.816    35.991
qmax          107.020   106.977   106.431
amean          70.294    70.482    70.329
amin           69.244    69.531    69.272
amax           71.732    71.728    71.594
emean           0.473     0.475     0.472
emin            0.454     0.456     0.456
emax            0.492     0.492     0.488
imean          26.843    26.845    26.917
imin           26.238    26.219    26.344
imax           27.758    27.758    27.754
excite_mean     0.654     0.655     0.654
fracstop        1.000     1.000     1.000
cjmean          2.831     2.831     2.831

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       181.6     181.6     183.2
kozaiamp        180.0     180.0     180.0