Orbit Fit and Astrometric record for 15GZ54

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: 15GZ54    
# Created Wed Feb 20 02:10:30 2019
# Orbit generated from Bernstein formalism
# Fitting   37 observations of   38
# Arc:   2.44y
# First observation: 2015/02/17
#  Last observation: 2017/07/27
Preliminary a, adot, b, bdot, g, gdot:
  -0.000061   0.017921   0.000001  -0.000177   0.020781   0.000000
# Chi-squared of fit:    19.86 DOF:   68 RMS:  0.13
# Min/Max residuals:    -0.69    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.363776E-05  1.803821E-02  2.588980E-08 -1.805897E-04  2.096349E-02  5.519698E-03
# Covariance matrix:
  1.6677E-13  5.9022E-15 -1.7986E-16 -8.5187E-16  1.2615E-13  2.6213E-12
  5.9022E-15  2.1628E-13  5.5815E-16 -3.2121E-15  1.8135E-13  7.4148E-12
 -1.7986E-16  5.5815E-16  9.8375E-14 -6.2175E-14  1.6792E-16  3.6126E-14
 -8.5187E-16 -3.2121E-15 -6.2175E-14  6.6283E-14 -3.1739E-15 -1.7064E-13
  1.2615E-13  1.8135E-13  1.6792E-16 -3.1739E-15  2.7051E-13  8.0926E-12
  2.6213E-12  7.4148E-12  3.6126E-14 -1.7064E-13  8.0926E-12  3.8098E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.905965 -157.580402    0.798391    0.019344   -0.577060  2457071.068908
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:           75.13606 +/-     0.147
Argument of Peri:      358.62004 +/-     0.067
Long of Asc Node:       95.63746 +/-     0.023
Inclination:             1.95701 +/-     0.000
Eccentricity:         0.27839218 +/-    0.0009
Semi-Major Axis:     48.03486935 +/-    0.0271
Time of Perihelion: 2431691.2218 +/-      44.6
Perihelion:          34.66233726 +/-    0.0488
Aphelion:            61.40740144 +/-    0.0566
Period (y)              332.9225 +/-      0.28
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -44.91306528 +/-    0.0011
Ecliptic Y          -17.66499124 +/-    0.0004
Ecliptic Z            1.58653291 +/-    0.0000
Ecliptic XDOT         0.00022807 +/-    0.0000
Ecliptic YDOT        -0.00245839 +/-    0.0000
Ecliptic ZDOT         0.00000050 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   48.28822253 +/-    0.0010
Geocenter to KBO     47.70197087 +/-    0.0012
# Hcoef:  7.79

The following table shows the complete astrometric record for 15GZ54. 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 (15GZ54) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.56813  13 25 47.317  -06 57 21.83  24.9r 15GZ54    568  C~2lV9      
2015 02  17.60905  13 25 47.224  -06 57 21.20  24.3r 15GZ54    568  C~2lV9      
2015 02  20.60184  13 25 40.853  -06 56 37.29  24.4r 15GZ54    568  C~2lV9      
2015 03  18.54653  13 24 24.057  -06 48 19.92  25.0r 15GZ54    568  C~2lV9      
2015 03  18.58746  13 24 23.906  -06 48 18.94  24.7r 15GZ54    568  C~2lV9      
2015 03  20.55033  13 24 16.838  -06 47 34.83  24.8r 15GZ54    568  C~2lV9      
2015 04  13.34921  13 22 44.196  -06 38 11.66  24.4r 15GZ54    568  C~2lV9      
2015 04  13.39016  13 22 44.041  -06 38 10.82  24.9r 15GZ54    568  C~2lV9      
2015 04  13.45967  13 22 43.756  -06 38 09.27  24.4r 15GZ54    568  C~2lV9      
2015 04  19.39003  13 22 20.001  -06 35 48.67  23.9r 15GZ54    568  C~2lV9      
2015 04  19.50158  13 22 19.559  -06 35 45.87  24.5r 15GZ54    568  C~2lV9      
2015 06  20.26264  13 19 20.975  -06 19 34.55  24.3r 15GZ54    568  C~2lV9      
2015 06  20.30355  13 19 20.943  -06 19 34.32        15GZ54    568  C~2lV9      
2015 06  22.30724  13 19 18.707  -06 19 25.90  23.9r 15GZ54    568  C~2lV9      
2015 07  14.25857  13 19 14.453  -06 19 57.95        15GZ54    568  C~2lV9      
2015 07  20.24993  13 19 19.588  -06 20 44.50  24.4r 15GZ54    568  C~2lV9      
2015 07  20.26062  13 19 19.597  -06 20 44.62  24.6r 15GZ54    568  C~2lV9      
2016 02  04.55115  13 29 57.555  -07 23 11.63  24.8w 15GZ54    568  C~2lV9      
2016 02  10.53908  13 29 50.307  -07 22 15.22  24.6w 15GZ54    568  C~2lV9      
2016 03  11.53623  13 28 37.729  -07 14 12.07  24.5w 15GZ54    568  C~2lV9      
2016 04  03.42104  13 27 13.996  -07 05 37.88  24.8w 15GZ54    568  C~2lV9      
2016 04  03.42508  13 27 13.976  -07 05 37.83  24.6w 15GZ54    568  C~2lV9      
2016 04  09.40077  13 26 50.228  -07 03 15.94  25.3w 15GZ54    568  C~2lV9      
2016 04  09.40482  13 26 50.219  -07 03 15.85  24.9w 15GZ54    568  C~2lV9      
2016 05  01.35239  13 25 23.787  -06 54 52.93  25.2w 15GZ54    568  C~2lV9      
2016 05  02.29500  13 25 20.262  -06 54 32.57  24.4w 15GZ54    568  C~2lV9      
2016 05  06.30476  13 25 05.475  -06 53 08.90  23.8w 15GZ54    568  C~2lV9      
2016 05  28.26791  13 23 55.604  -06 46 46.92  25.2w 15GZ54    568  C~2lV9      
2016 06  04.34936  13 23 38.244  -06 45 18.07  25.0w 15GZ54    568  C~2lV9      
2016 06  27.26867  13 23 04.430  -06 42 50.54  25.3w 15GZ54    568  C~2lV9      
2016 07  06.30443  13 23 01.397  -06 42 56.02  24.7w 15GZ54    568  C~2lV9      
2017 02  24.62769  13 33 10.638  -07 42 01.53        15GZ54    568  C~2lV9      
2017 02  24.63851  13 33 10.610  -07 42 01.48        15GZ54    568  C~2lV9      
2017 03  28.56493  13 31 28.751  -07 31 23.90  24.6w 15GZ54    568  C~2lV9      
2017 06  21.28313  13 26 58.965  -07 06 28.58  24.8w 15GZ54    568  C~2lV9      
2017 06  22.26639  13 26 57.827  -07 06 24.20  25.1w 15GZ54    568  C~2lV9      
2017 07  26.25161  13 27 02.151  -07 08 16.75  24.0w 15GZ54    568  C~2lV9      
2017 07  27.26646  13 27 03.579  -07 08 28.09  24.4w 15GZ54    568  C~2lV9      

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    -0.01       0.00    -0.03
  2   0.0001     -1.52    -0.12       0.07    -0.02
  3   0.0083   -105.90    -0.02       5.71    -0.07
  4   0.0793  -1352.47     0.14      43.56     0.00
  5   0.0795  -1354.93     0.09      43.63     0.05
  6   0.0848  -1469.06     0.06      45.52     0.06
  7   0.1500  -2959.78    -0.18      55.62     0.07
  8   0.1501  -2962.24     0.04      55.54     0.01
  9   0.1503  -2966.76     0.07      55.40    -0.09
 10   0.1665  -3347.70     0.12      54.24     0.03
 11   0.1668  -3354.86     0.20      54.39     0.26
 12   0.3359  -6188.39     0.24     -36.56    -0.02
 13   0.3360  -6188.92 (   0.47)    -36.53 (   0.12)
 14   0.3415  -6223.02    -0.69     -41.17     0.11
 15   0.4016  -6269.92     0.02     -94.61    -0.14
 16   0.4180  -6181.44     0.09    -109.21    -0.01
 17   0.4180  -6181.27     0.08    -109.27    -0.05
 18   0.9637   4033.80    -0.03     -64.50    -0.06
 19   0.9801   3912.73    -0.01     -51.77    -0.08
 20   1.0622   2730.53    -0.13      -0.79     0.20
 21   1.1249   1382.40    -0.03      16.73    -0.01
 22   1.1249   1382.11    -0.07      16.67    -0.07
 23   1.1412   1001.18    -0.08      17.76    -0.04
 24   1.1412   1001.02     0.03      17.80    -0.00
 25   1.2013   -380.60    -0.01       8.48    -0.33
 26   1.2039   -436.90     0.08       7.93    -0.06
 27   1.2149   -672.43     0.11       4.01    -0.06
 28   1.2750  -1780.54     0.10     -27.42     0.12
 29   1.2944  -2053.65    -0.04     -40.96    -0.03
 30   1.3572  -2576.18    -0.16     -91.19     0.14
 31   1.3819  -2616.09    -0.00    -113.07    -0.00
 32   2.0207   7121.61     0.03     -60.26     0.03
 33   2.0207   7121.20     0.06     -60.37    -0.09
 34   2.1081   5476.92    -0.14     -23.18     0.05
 35   2.3401   1193.27     0.00    -113.11    -0.00
 36   2.3428   1175.91     0.04    -115.31     0.04
 37   2.4358   1277.33     0.19    -196.08     0.19
 38   2.4386   1301.28    -0.06    -198.75    -0.10

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.

15GZ54    quality flag:3

Type:           2:1E      2:1E      2:1E

axisobj        47.569    47.643    47.496
ecceobj         0.278     0.281     0.276
incobj          1.957     1.957     1.957
qmin           33.913    33.808    33.980
qmax           62.352    62.548    62.381
amean          47.798    47.797    47.798
amin           47.291    47.232    47.291
amax           48.428    48.452    48.436
emean           0.275     0.277     0.274
emin            0.261     0.263     0.260
emax            0.289     0.292     0.288
imean           1.118     0.559     1.034
imin            0.396     0.305     0.389
imax            1.876     0.771     1.716
excite_mean     0.276     0.278     0.275
fracstop        1.000     1.000     1.000
cjmean          3.052     3.051     3.053

libcent 0       284.1     281.0     284.5
libamp  0        22.5      33.5      20.8
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       206.8     185.3     202.4
kozaiamp        180.0     180.0     179.8