Orbit Fit and Astrometric record for 15GZ55

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: 15GZ55    
# Created Fri Feb 22 02:10:22 2019
# Orbit generated from Bernstein formalism
# Fitting   39 observations of   39
# Arc:   2.35y
# First observation: 2015/02/17
#  Last observation: 2017/06/25
Preliminary a, adot, b, bdot, g, gdot:
  -0.000139   0.028400   0.000006   0.002071   0.025003   0.000000
# Chi-squared of fit:     5.01 DOF:   72 RMS:  0.06
# Min/Max residuals:    -0.26    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.775515E-05  2.845695E-02  1.458442E-06  2.086707E-03  2.514437E-02  6.385025E-03
# Covariance matrix:
  1.3471E-13 -3.7848E-14 -6.4473E-16  1.9896E-15  7.3565E-14  4.6107E-13
 -3.7848E-14  3.3636E-13 -8.0366E-15  3.0706E-14  1.5878E-13  7.0878E-12
 -6.4473E-16 -8.0366E-15  8.6802E-14 -6.2395E-14 -4.8128E-15 -2.2017E-13
  1.9896E-15  3.0706E-14 -6.2395E-14  8.0891E-14  1.7780E-14  8.4312E-13
  7.3565E-14  1.5878E-13 -4.8128E-15  1.7780E-14  1.7323E-13  4.1064E-12
  4.6107E-13  7.0878E-12 -2.2017E-13  8.4312E-13  4.1064E-12  1.9461E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.544330 -152.600265    0.845907    0.004945   -0.505188  2457071.023648
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:           15.07635 +/-     0.022
Argument of Peri:      327.89734 +/-     0.065
Long of Asc Node:      198.88865 +/-     0.001
Inclination:             4.21850 +/-     0.001
Eccentricity:         0.42568464 +/-    0.0004
Semi-Major Axis:     65.38092222 +/-    0.0305
Time of Perihelion: 2448983.8516 +/-      10.1
Perihelion:          37.54926778 +/-    0.0333
Aphelion:            93.21257667 +/-    0.0519
Period (y)              528.6701 +/-      0.37
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -36.14772061 +/-    0.0006
Ecliptic Y          -17.78282252 +/-    0.0003
Ecliptic Z            0.37788083 +/-    0.0000
Ecliptic XDOT         0.00080699 +/-    0.0000
Ecliptic YDOT        -0.00307544 +/-    0.0000
Ecliptic ZDOT         0.00023390 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.28683751 +/-    0.0005
Geocenter to KBO     39.77033275 +/-    0.0007
# Hcoef:  7.89

The following table shows the complete astrometric record for 15GZ55. 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 (15GZ55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.52287  13 42 31.928  -10 02 22.98  23.8r 15GZ55    568  C~2lVD      
2015 02  17.56399  13 42 31.844  -10 02 22.42  23.7r 15GZ55    568  C~2lVD      
2015 02  20.59770  13 42 25.946  -10 01 42.74  24.0r 15GZ55    568  C~2lVD      
2015 03  18.50144  13 41 07.396  -09 53 26.79  24.1r 15GZ55    568  C~2lVD      
2015 03  18.54235  13 41 07.227  -09 53 25.78  23.8r 15GZ55    568  C~2lVD      
2015 03  20.54594  13 40 59.412  -09 52 37.73  23.8r 15GZ55    568  C~2lVD      
2015 04  11.48071  13 39 24.344  -09 43 00.61  23.7r 15GZ55    568  C~2lVD      
2015 04  12.38760  13 39 20.203  -09 42 35.40  23.8r 15GZ55    568  C~2lVD      
2015 04  12.43323  13 39 19.988  -09 42 34.35  23.8r 15GZ55    568  C~2lVD      
2015 04  12.47547  13 39 19.781  -09 42 33.15  23.7r 15GZ55    568  C~2lVD      
2015 04  18.44608  13 38 52.277  -09 39 47.71  23.6r 15GZ55    568  C~2lVD      
2015 04  18.49382  13 38 52.060  -09 39 46.52  23.7r 15GZ55    568  C~2lVD      
2015 05  17.25497  13 36 47.356  -09 27 20.11  23.6r 15GZ55    568  C~2lVD      
2015 05  25.39688  13 36 17.824  -09 24 24.02  23.8r 15GZ55    568  C~2lVD      
2015 05  25.45500  13 36 17.621  -09 24 22.84  23.9r 15GZ55    568  C~2lVD      
2015 06  21.34643  13 35 11.625  -09 17 47.17  23.9r 15GZ55    568  C~2lVD      
2015 06  22.30309  13 35 10.326  -09 17 39.24  24.2r 15GZ55    568  C~2lVD      
2015 07  12.29701  13 35 01.450  -09 16 41.03  24.1r 15GZ55    568  C~2lVD      
2015 07  19.28682  13 35 06.887  -09 17 10.34  23.9r 15GZ55    568  C~2lVD      
2016 02  04.62644  13 49 06.131  -10 32 13.48  24.1w 15GZ55    568  C~2lVD      
2016 02  04.63139  13 49 06.126  -10 32 13.21  24.3w 15GZ55    568  C~2lVD      
2016 02  04.63544  13 49 06.125  -10 32 13.22  24.4w 15GZ55    568  C~2lVD      
2016 02  11.60966  13 49 00.648  -10 31 26.79  24.3w 15GZ55    568  C~2lVD      
2016 02  11.61375  13 49 00.643  -10 31 26.77  24.2w 15GZ55    568  C~2lVD      
2016 03  11.61710  13 47 53.039  -10 24 07.75  22.4w 15GZ55    568  C~2lVD      
2016 03  12.48956  13 47 50.062  -10 23 49.39  24.2w 15GZ55    568  C~2lVD      
2016 04  03.48576  13 46 22.061  -10 14 57.44  24.0w 15GZ55    568  C~2lVD      
2016 04  09.46692  13 45 55.237  -10 12 17.66  24.0w 15GZ55    568  C~2lVD      
2016 05  02.35585  13 44 10.998  -10 02 02.00  24.1w 15GZ55    568  C~2lVD      
2016 05  07.35921  13 43 49.202  -09 59 54.16  24.1w 15GZ55    568  C~2lVD      
2016 05  29.33148  13 42 25.738  -09 51 45.88  23.7w 15GZ55    568  C~2lVD      
2016 06  04.39391  13 42 07.474  -09 49 59.46  24.2w 15GZ55    568  C~2lVD      
2016 06  27.31561  13 41 23.391  -09 45 41.99  24.2w 15GZ55    568  C~2lVD      
2016 07  07.31185  13 41 18.010  -09 45 09.77  24.2w 15GZ55    568  C~2lVD      
2017 02  27.65350  13 54 47.785  -10 55 20.49        15GZ55    568  C~2lVD      
2017 03  30.51590  13 53 01.732  -10 44 35.55  23.9w 15GZ55    568  C~2lVD      
2017 03  31.45116  13 52 57.762  -10 44 11.93  24.3w 15GZ55    568  C~2lVD      
2017 05  24.25622  13 49 04.226  -10 21 38.51  24.0w 15GZ55    568  C~2lVD      
2017 06  25.28243  13 47 42.486  -10 13 54.23  24.2w 15GZ55    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     0.03       0.00    -0.03
  2   0.0001     -1.36    -0.07       0.08    -0.01
  3   0.0084    -96.91     0.02       5.87     0.03
  4   0.0793  -1358.12     0.08      51.90    -0.05
  5   0.0795  -1360.81    -0.04      51.95    -0.05
  6   0.0849  -1485.86     0.00      55.24     0.00
  7   0.1450  -3004.82    -0.04      87.33     0.03
  8   0.1475  -3071.03     0.05      88.75     0.23
  9   0.1476  -3074.38     0.11      88.58     0.03
 10   0.1477  -3077.67    -0.03      88.60     0.01
 11   0.1641  -3516.76    -0.07      96.06     0.07
 12   0.1642  -3520.18     0.08      96.01    -0.02
 13   0.2429  -5510.83    -0.07     124.28     0.10
 14   0.2652  -5982.30    -0.01     129.85    -0.04
 15   0.2654  -5985.53    -0.03     129.86    -0.05
 16   0.3390  -7040.37    -0.01     143.65     0.00
 17   0.3416  -7061.19     0.03     144.05     0.02
 18   0.3964  -7204.93    -0.05     150.48     0.00
 19   0.4155  -7119.19     0.04     152.46     0.03
 20   0.9640   6075.85     0.08     399.89    -0.26
 21   0.9640   6075.69    -0.04     400.12    -0.05
 22   0.9640   6075.68    -0.01     400.10    -0.07
 23   0.9831   5983.62    -0.02     414.95     0.01
 24   0.9831   5983.55    -0.02     414.94    -0.00
 25   1.0625   4894.73    -0.09     472.10    -0.03
 26   1.0649   4847.12     0.03     473.68    -0.07
 27   1.1252   3443.63     0.05     509.41    -0.05
 28   1.1415   3016.62    -0.05     517.72    -0.01
 29   1.2042   1358.80     0.04     543.55     0.08
 30   1.2179   1012.40     0.05     547.80     0.01
 31   1.2781   -313.88     0.01     561.91     0.00
 32   1.2947   -604.02    -0.01     564.39    -0.09
 33   1.3574  -1304.64    -0.03     570.63    -0.01
 34   1.3848  -1390.45    -0.02     572.10     0.09
 35   2.0291  11286.71    -0.04     873.24    -0.06
 36   2.1136   9593.00     0.04     930.00    -0.03
 37   2.1162   9529.79    -0.04     931.58     0.07
 38   2.2635   5824.68     0.05     984.06     0.06
 39   2.3512   4531.25    -0.01     990.56     0.13

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.

15GZ55    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        64.285    64.377    64.194
ecceobj         0.416     0.417     0.415
incobj          4.234     4.234     4.234
qmin           36.808    36.872    36.903
qmax           94.610    94.595    93.897
amean          64.958    64.987    64.720
amin           64.044    64.009    63.938
amax           66.085    66.076    65.801
emean           0.421     0.421     0.418
emin            0.409     0.409     0.408
emax            0.433     0.433     0.429
imean           4.658     4.763     4.729
imin            4.164     4.417     4.362
imax            5.084     5.114     5.064
excite_mean     0.429     0.429     0.426
fracstop        1.000     1.000     1.000
cjmean          3.119     3.119     3.120

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       169.5     168.5     172.2
kozaiamp        180.0     180.0     180.0