Orbit Fit and Astrometric record for 15GD56

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: 15GD56    
# Created Mon Apr 22 01:10:05 2019
# Orbit generated from Bernstein formalism
# Fitting   38 observations of   38
# Arc:   2.35y
# First observation: 2015/02/17
#  Last observation: 2017/06/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.000157   0.026902   0.000012   0.002626   0.024263   0.000000
# Chi-squared of fit:     7.74 DOF:   70 RMS:  0.08
# Min/Max residuals:    -0.29    0.16
# Exact a, adot, b, bdot, g, gdot:
  1.717693E-05  2.694538E-02  1.619188E-06  2.649977E-03  2.442582E-02  6.420377E-03
# Covariance matrix:
  1.4713E-13  1.9888E-15 -3.0281E-15  8.4084E-15  1.1325E-13  1.5164E-12
  1.9888E-15  3.5221E-13 -1.1622E-14  4.5951E-14  1.9365E-13  8.5832E-12
 -3.0281E-15 -1.1622E-14  7.6685E-14 -6.0759E-14 -9.0244E-15 -3.8035E-13
  8.4084E-15  4.5951E-14 -6.0759E-14  9.9994E-14  3.1408E-14  1.5342E-12
  1.1325E-13  1.9365E-13 -9.0244E-15  3.1408E-14  2.2564E-13  5.8017E-12
  1.5164E-12  8.5832E-12 -3.8035E-13  1.5342E-12  5.8017E-12  2.8703E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.874502 -154.839828    0.824811    0.027167   -0.538284  2457071.097458
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:           16.92593 +/-     0.027
Argument of Peri:      343.82290 +/-     0.079
Long of Asc Node:      177.43009 +/-     0.003
Inclination:             6.31706 +/-     0.001
Eccentricity:         0.41787414 +/-    0.0006
Semi-Major Axis:     65.65275889 +/-    0.0389
Time of Perihelion: 2447935.0908 +/-      12.0
Perihelion:          38.21816887 +/-    0.0439
Aphelion:            93.08734892 +/-    0.0668
Period (y)              531.9707 +/-      0.47
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.85057518 +/-    0.0007
Ecliptic Y          -16.86649118 +/-    0.0003
Ecliptic Z            2.05316244 +/-    0.0000
Ecliptic XDOT         0.00064335 +/-    0.0000
Ecliptic YDOT        -0.00303852 +/-    0.0000
Ecliptic ZDOT         0.00033284 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.48927623 +/-    0.0007
Geocenter to KBO     40.94027574 +/-    0.0008
# Hcoef:  7.86

The following table shows the complete astrometric record for 15GD56. 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 (15GD56) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.59668  13 37 29.180  -07 03 32.52  24.0r 15GD56    568  C~2lVD      
2015 02  17.63771  13 37 29.096  -07 03 31.93  23.8r 15GD56    568  C~2lVD      
2015 02  20.63083  13 37 23.107  -07 02 40.70  23.9r 15GD56    568  C~2lVD      
2015 03  18.57516  13 36 04.670  -06 53 02.62  23.8r 15GD56    568  C~2lVD      
2015 03  18.62254  13 36 04.489  -06 53 01.31  23.9r 15GD56    568  C~2lVD      
2015 03  20.57938  13 35 56.967  -06 52 10.33  24.1r 15GD56    568  C~2lVD      
2015 04  11.51365  13 34 24.397  -06 42 07.45  23.9r 15GD56    568  C~2lVD      
2015 04  13.37789  13 34 16.135  -06 41 15.60  23.8r 15GD56    568  C~2lVD      
2015 04  13.41891  13 34 15.938  -06 41 14.44  23.7r 15GD56    568  C~2lVD      
2015 04  13.42365  13 34 15.911  -06 41 14.33  23.8r 15GD56    568  C~2lVD      
2015 04  13.42846  13 34 15.895  -06 41 14.18  23.8r 15GD56    568  C~2lVD      
2015 04  13.43331  13 34 15.878  -06 41 13.96  23.9r 15GD56    568  C~2lVE      
2015 04  13.43815  13 34 15.860  -06 41 13.97  24.0r 15GD56    568  C~2lVE      
2015 04  13.52145  13 34 15.483  -06 41 11.65  23.9r 15GD56    568  C~2lVE      
2015 04  19.48929  13 33 48.924  -06 38 26.98  23.9r 15GD56    568  C~2lVE      
2015 04  19.53630  13 33 48.713  -06 38 25.74  23.8r 15GD56    568  C~2lVE      
2015 04  19.56015  13 33 48.587  -06 38 25.23  24.0r 15GD56    568  C~2lVE      
2015 05  18.34130  13 31 49.997  -06 26 45.22  23.8r 15GD56    568  C~2lVE      
2015 06  20.29133  13 30 25.736  -06 19 30.29  23.6r 15GD56    568  C~2lVE      
2015 06  20.33212  13 30 25.684  -06 19 30.01  23.4r 15GD56    568  C~2lVE      
2015 06  22.33610  13 30 23.151  -06 19 20.48  24.0r 15GD56    568  C~2lVE      
2015 07  14.28829  13 30 17.838  -06 19 51.72  24.0r 15GD56    568  C~2lVE      
2015 07  20.28135  13 30 23.697  -06 20 44.02  24.4r 15GD56    568  C~2lVE      
2016 02  04.58367  13 43 44.559  -07 31 13.18  24.4w 15GD56    568  C~2lVE      
2016 02  10.57151  13 43 39.462  -07 30 07.39  24.2w 15GD56    568  C~2lVE      
2016 02  10.61301  13 43 39.414  -07 30 06.97  24.1w 15GD56    568  C~2lVE      
2016 03  11.56297  13 42 29.892  -07 20 48.77  23.5w 15GD56    568  C~2lVE      
2016 04  03.44935  13 41 00.697  -07 10 53.73  24.0w 15GD56    568  C~2lVE      
2016 04  09.43049  13 40 34.670  -07 08 09.35  24.0w 15GD56    568  C~2lVE      
2016 05  01.45743  13 38 57.920  -06 58 24.12  24.2w 15GD56    568  C~2lVE      
2016 05  07.33487  13 38 33.385  -06 56 01.88  24.2w 15GD56    568  C~2lVE      
2016 05  29.33959  13 37 14.131  -06 48 44.60  24.3w 15GD56    568  C~2lVE      
2016 06  04.40200  13 36 57.022  -06 47 17.08  24.4w 15GD56    568  C~2lVE      
2016 06  27.34644  13 36 16.728  -06 44 22.38  24.4w 15GD56    568  C~2lVE      
2016 07  07.33613  13 36 12.615  -06 44 28.94  24.1w 15GD56    568  C~2lVE      
2017 03  29.51368  13 47 22.886  -07 37 58.89  24.4w 15GD56    568  C~2lVE      
2017 03  30.48302  13 47 18.903  -07 37 33.07  24.2w 15GD56    568  C~2lVE      
2017 06  24.30392  13 42 16.102  -07 09 18.17  24.2w 15GD56    568  C~2lVE      

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     0.06       0.00     0.02
  2   0.0001     -1.38     0.04       0.10    -0.08
  3   0.0083   -103.05    -0.01      15.49    -0.07
  4   0.0793  -1401.14    -0.01     129.98    -0.04
  5   0.0795  -1404.13    -0.01     130.22     0.04
  6   0.0848  -1527.02    -0.29     136.99    -0.18
  7   0.1449  -3030.89     0.05     196.76     0.05
  8   0.1500  -3164.44     0.16     200.21     0.03
  9   0.1501  -3167.59    -0.00     200.22    -0.01
 10   0.1501  -3168.01    -0.07     200.18    -0.06
 11   0.1501  -3168.29     0.00     200.23    -0.01
 12   0.1501  -3168.60     0.04     200.34     0.09
 13   0.1501  -3168.85     0.15     200.24    -0.02
 14   0.1504  -3174.93     0.15     200.35    -0.02
 15   0.1667  -3603.53     0.01     209.48     0.09
 16   0.1668  -3606.91     0.04     209.49     0.05
 17   0.1669  -3608.85    -0.16     209.28    -0.18
 18   0.2457  -5510.63     0.08     215.91     0.01
 19   0.3359  -6839.94    -0.09     161.20     0.08
 20   0.3360  -6840.77    -0.03     161.18     0.16
 21   0.3415  -6879.44    -0.03     156.22     0.01
 22   0.4016  -6941.78     0.02      98.11     0.06
 23   0.4180  -6841.23    -0.07      81.42    -0.01
 24   0.9637   5809.47     0.09     468.87    -0.00
 25   0.9801   5715.01    -0.10     503.02     0.04
 26   0.9802   5714.20    -0.03     503.15    -0.04
 27   1.0622   4547.78    -0.08     651.76     0.01
 28   1.1249   3094.80     0.04     728.12     0.04
 29   1.1412   2674.14     0.04     741.52     0.05
 30   1.2015   1119.56     0.01     766.25     0.00
 31   1.2176    727.52     0.02     766.53     0.01
 32   1.2779   -531.00    -0.04     746.10     0.02
 33   1.2945   -800.22    -0.10     735.16    -0.11
 34   1.3573  -1422.91     0.06     679.93    -0.13
 35   1.3846  -1477.60     0.03     651.55     0.16
 36   2.1107   8989.61    -0.00    1255.05    -0.09
 37   2.1133   8924.95    -0.01    1257.97     0.03
 38   2.3483   4107.37     0.03    1222.16    -0.01

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.

15GD56    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        64.574    64.688    64.460
ecceobj         0.409     0.410     0.407
incobj          6.342     6.342     6.341
qmin           37.485    37.382    37.554
qmax           94.174    95.092    93.853
amean          65.155    65.410    64.958
amin           64.393    64.551    64.067
amax           66.202    66.599    66.065
emean           0.412     0.416     0.410
emin            0.402     0.405     0.399
emax            0.423     0.428     0.421
imean           5.991     5.887     6.008
imin            5.730     5.471     5.745
imax            6.224     6.209     6.212
excite_mean     0.425     0.429     0.423
fracstop        1.000     1.000     1.000
cjmean          3.128     3.126     3.129

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       180.0     169.1     171.6
kozaiamp        180.0     180.0     180.0