Orbit Fit and Astrometric record for 15GC55

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: 15GC55    
# Created Mon Apr 22 01:10:05 2019
# Orbit generated from Bernstein formalism
# Fitting   34 observations of   35
# Arc:   2.02y
# First observation: 2015/02/17
#  Last observation: 2017/02/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.000126   0.025480   0.000001   0.000892   0.024895   0.000000
# Chi-squared of fit:     8.58 DOF:   62 RMS:  0.09
# Min/Max residuals:    -0.18    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.590534E-05  2.540773E-02  9.910144E-07  8.925940E-04  2.496071E-02  1.597781E-03
# Covariance matrix:
  1.7600E-13  2.3171E-15 -8.0087E-16  4.3037E-15  1.4697E-13  3.0715E-12
  2.3171E-15  3.0213E-13 -1.8395E-15  1.0469E-14  2.0181E-13  7.5107E-12
 -8.0087E-16 -1.8395E-15  9.6144E-14 -8.4075E-14 -2.0223E-15 -8.4224E-14
  4.3037E-15  1.0469E-14 -8.4075E-14  1.3314E-13  1.1196E-14  4.8459E-13
  1.4697E-13  2.0181E-13 -2.0223E-15  1.1196E-14  2.9466E-13  8.0125E-12
  3.0715E-12  7.5107E-12 -8.4224E-14  4.8459E-13  8.0125E-12  3.4800E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.165863 -155.133990    0.822946    0.001716   -0.541804  2457071.002878
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:           28.17955 +/-     0.347
Argument of Peri:      331.29175 +/-     0.429
Long of Asc Node:      199.05577 +/-     0.002
Inclination:             2.01893 +/-     0.001
Eccentricity:         0.08669129 +/-    0.0004
Semi-Major Axis:     43.88635182 +/-    0.0041
Time of Perihelion: 2448758.1427 +/-     102.3
Perihelion:          40.08178720 +/-    0.0197
Aphelion:            47.69091644 +/-    0.0199
Period (y)              290.7384 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.18909477 +/-    0.0008
Ecliptic Y          -16.32746383 +/-    0.0004
Ecliptic Z            0.11601030 +/-    0.0000
Ecliptic XDOT         0.00100948 +/-    0.0000
Ecliptic YDOT        -0.00260766 +/-    0.0000
Ecliptic ZDOT         0.00009850 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.61561649 +/-    0.0007
Geocenter to KBO     40.06295922 +/-    0.0009
# Hcoef:  8.45

The following table shows the complete astrometric record for 15GC55. 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 (15GC55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.50210  13 32 23.449  -09 28 28.00  24.5r 15GC55    568  C~2lV9      
2015 02  17.54344  13 32 23.353  -09 28 27.38  24.5r 15GC55    568  C~2lV9      
2015 02  20.47426  13 32 16.756  -09 27 46.67  24.8r 15GC55    568  C~2lV9      
2015 03  18.47063  13 30 51.320  -09 19 09.76  24.1r 15GC55    568  C~2lV9      
2015 03  18.47537  13 30 51.302  -09 19 09.72  24.7r 15GC55    568  C~2lV9      
2015 03  18.52182  13 30 51.102  -09 19 08.61  24.4r 15GC55    568  C~2lV9      
2015 03  20.52388  13 30 42.890  -09 18 19.33  24.5r 15GC55    568  C~2lV9      
2015 04  11.41445  13 29 04.931  -09 08 32.56  24.1r 15GC55    568  C~2lV9      
2015 04  12.36711  13 29 00.484  -09 08 05.62  24.8r 15GC55    568  C~2lV9      
2015 04  12.40803  13 29 00.303  -09 08 04.59  24.2r 15GC55    568  C~2lV9      
2015 04  12.45503  13 29 00.071  -09 08 03.19  24.2r 15GC55    568  C~2lV9      
2015 04  14.46499  13 28 50.674  -09 07 07.21  23.8r 15GC55    568  C~2lV9      
2015 04  18.42564  13 28 32.137  -09 05 16.25  24.1r 15GC55    568  C~2lV9      
2015 04  18.47335  13 28 31.909  -09 05 15.05  24.0r 15GC55    568  C~2lV9      
2015 05  25.37637  13 25 58.370  -08 49 54.69  24.7r 15GC55    568  C~2lV9      
2015 05  25.43418  13 25 58.176  -08 49 53.20  24.6r 15GC55    568  C~2lV9      
2015 06  21.32593  13 24 55.119  -08 43 32.41  24.7r 15GC55    568  C~2lV9      
2015 06  22.28249  13 24 53.941  -08 43 25.11  24.5r 15GC55    568  C~2lV9      
2015 07  15.26670  13 24 49.841  -08 42 54.97  24.4r 15GC55    568  C~2lV9      
2015 07  19.26636  13 24 53.950  -08 43 18.38  24.9r 15GC55    568  C~2lV9      
2016 02  04.60217  13 38 17.014  -09 59 23.87  24.9w 15GC55    568  C~2lV9      
2016 02  10.62117  13 38 10.355  -09 58 40.49  24.6w 15GC55    568  C~2lV9      
2016 02  11.58524  13 38 08.972  -09 58 31.75  24.7w 15GC55    568  C~2lV9      
2016 03  12.48427  13 36 49.008  -09 50 28.18  24.6w 15GC55    568  C~2lV9      
2016 04  03.46148  13 35 16.608  -09 41 20.24  24.5w 15GC55    568  C~2lV9      
2016 04  09.44264  13 34 48.974  -09 38 36.89  24.4w 15GC55    568  C~2lV9      
2016 05  02.32341  13 33 03.314  -09 28 12.63  24.5w 15GC55    568  C~2lVA      
2016 05  06.33319  13 32 45.773  -09 26 29.13  24.6w 15GC55    568  C~2lVA      
2016 05  28.31243  13 31 22.368  -09 18 15.99  24.5w 15GC55    568  C~2lVA      
2016 05  29.31935  13 31 19.197  -09 17 57.12  24.5w 15GC55    568  C~2lVA      
2016 06  04.38178  13 31 01.558  -09 16 12.42  24.7w 15GC55    568  C~2lVA      
2016 06  27.30147  13 30 20.562  -09 12 08.18  24.7w 15GC55    568  C~2lVA      
2016 06  27.30677  13 30 20.544  -09 12 08.34  24.4w 15GC55    568  C~2lVA      
2016 07  07.30364  13 30 16.689  -09 11 44.00  24.7w 15GC55    568  C~2lVA      
2017 02  24.65166  13 43 16.427  -10 24 15.50        15GC55    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    -0.09
  2   0.0001     -1.55    -0.05       0.06    -0.04
  3   0.0081   -107.28     0.01       2.23     0.01
  4   0.0793  -1473.14     0.08      19.87     0.07
  5   0.0793  -1473.40     0.13      19.81     0.01
  6   0.0795  -1476.56     0.03      19.76    -0.05
  7   0.0849  -1607.73    -0.02      20.99    -0.06
  8   0.1449  -3172.48    -0.05      33.63    -0.14
  9   0.1475  -3243.65    -0.14      34.44     0.14
 10   0.1476  -3246.52     0.09      34.41     0.11
 11   0.1477  -3250.23    -0.05      34.44     0.15
 12   0.1532  -3400.28     0.18      35.25    -0.08
 13   0.1641  -3696.48    -0.11      37.29    -0.05
 14   0.1642  -3700.07    -0.08      37.16    -0.18
 15   0.2652  -6155.55    -0.00      52.51    -0.07
 16   0.2654  -6158.77    -0.10      52.83     0.24
 17   0.3390  -7169.16     0.06      60.34    -0.05
 18   0.3416  -7188.11     0.05      60.65    -0.00
 19   0.4046  -7255.82 (   0.49)     66.11 (   0.11)
 20   0.4155  -7190.48    -0.02      66.95     0.06
 21   0.9640   5545.44    -0.03     173.49     0.02
 22   0.9805   5437.96     0.05     178.33     0.03
 23   0.9831   5415.73    -0.09     179.08    -0.00
 24   1.0650   4138.55    -0.11     201.56    -0.07
 25   1.1251   2666.48     0.06     215.64    -0.03
 26   1.1415   2226.37    -0.03     219.00    -0.00
 27   1.2042    543.35     0.17     229.99     0.11
 28   1.2151    263.94     0.02     231.45     0.01
 29   1.2753  -1065.28     0.03     238.44    -0.08
 30   1.2781  -1115.87    -0.02     238.79     0.01
 31   1.2947  -1397.21    -0.15     240.45     0.20
 32   1.3574  -2051.50     0.11     244.88     0.07
 33   1.3574  -2051.69    -0.01     244.63    -0.17
 34   1.3848  -2113.73    -0.05     246.31    -0.07
 35   2.0209  10213.29     0.02     373.73    -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.

15GC55    quality flag:3

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

axisobj        43.455    43.469    43.440
ecceobj         0.078     0.079     0.077
incobj          2.028     2.028     2.027
qmin           39.415    39.415    39.382
qmax           48.322    48.387    48.332
amean          43.727    43.726    43.726
amin           43.354    43.350    43.347
amax           44.118    44.143    44.130
emean           0.082     0.084     0.083
emin            0.068     0.071     0.069
emax            0.096     0.096     0.096
imean           3.153     3.178     3.127
imin            2.318     2.364     2.282
imax            4.134     3.941     4.189
excite_mean     0.099     0.101     0.100
fracstop        1.000     1.000     1.000
cjmean          3.086     3.086     3.086

libcent 0       185.8     181.3     181.6
libamp  0        98.9     132.2      97.2
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       193.7     149.1     178.2
kozaiamp        180.0     180.0     180.0