Orbit Fit and Astrometric record for 15GM55

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: 15GM55    
# Created Fri Dec  3 02:13:16 2021
# Orbit generated from Bernstein formalism
# Fitting     27 observations of     27
# Arc:   2.12y
# First observation: 2015/02/17
#  Last observation: 2017/03/31
Preliminary a, adot, b, bdot, g, gdot:
  -0.000195   0.041923  -0.000002  -0.006652   0.031933   0.000000
# Chi-squared of fit:     8.52 DOF:     48 RMS:  0.10
# Min/Max residuals:    -0.33    0.25
# Exact a, adot, b, bdot, g, gdot:
  2.034726E-05  4.174848E-02 -3.523851E-06 -6.650635E-03  3.199498E-02  5.466955E-03
# Covariance matrix:
  2.2074E-13 -4.6687E-14  2.1551E-15 -1.2421E-14  1.3429E-13  1.1666E-12
 -4.6687E-14  5.4241E-13  1.8208E-14 -9.3998E-14  2.4734E-13  8.7083E-12
  2.1551E-15  1.8208E-14  1.3292E-13 -1.1757E-13  1.0674E-14  4.2352E-13
 -1.2421E-14 -9.3998E-14 -1.1757E-13  1.8727E-13 -5.6632E-14 -2.1804E-12
  1.3429E-13  2.4734E-13  1.0674E-14 -5.6632E-14  2.6891E-13  5.2653E-12
  1.1666E-12  8.7083E-12  4.2352E-13 -2.1804E-12  5.2653E-12  2.0193E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.714720 -152.725733    0.844799    0.006471   -0.507023  2457071.023648
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:            6.85509 +/-     0.019
Argument of Peri:      156.00408 +/-     0.057
Long of Asc Node:       30.17950 +/-     0.000
Inclination:             9.02166 +/-     0.001
Eccentricity:         0.44184003 +/-    0.0002
Semi-Major Axis:     55.92759376 +/-    0.0122
Time of Perihelion: 2454161.4688 +/-       8.0
Perihelion:          31.21654394 +/-    0.0122
Aphelion:            80.63864358 +/-    0.0203
Period (y)              418.2610 +/-      0.14
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -28.61847047 +/-    0.0005
Ecliptic Y          -13.80290992 +/-    0.0002
Ecliptic Z            0.38975638 +/-    0.0000
Ecliptic XDOT         0.00121135 +/-    0.0000
Ecliptic YDOT        -0.00339848 +/-    0.0000
Ecliptic ZDOT        -0.00056313 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   31.77560518 +/-    0.0004
Geocenter to KBO     31.25490258 +/-    0.0005
# Hcoef:  9.39

The following table shows the complete astrometric record for 15GM55. 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 (15GM55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.52287  13 42 18.287  -09 50 08.38  24.5r 15GM55    568  C~2lVB      
2015 02  17.56399  13 42 18.184  -09 50 08.15  24.5r 15GM55    568  C~2lVB      
2015 02  20.59770  13 42 10.870  -09 49 34.88  24.4r 15GM55    568  C~2lVB      
2015 03  20.54594  13 40 22.345  -09 40 41.41  23.4r 15GM55    568  C~2lVB      
2015 04  11.48071  13 38 22.476  -09 30 35.35  24.2r 15GM55    568  C~2lVB      
2015 04  12.38760  13 38 17.253  -09 30 08.78  24.3r 15GM55    568  C~2lVB      
2015 04  12.43323  13 38 16.981  -09 30 07.36  24.6r 15GM55    568  C~2lVB      
2015 04  12.47547  13 38 16.723  -09 30 05.88  24.4r 15GM55    568  C~2lVB      
2015 05  17.25497  13 35 05.079  -09 14 13.24  24.3r 15GM55    568  C~2lVB      
2015 05  25.39688  13 34 28.246  -09 11 19.00  24.3r 15GM55    568  C~2lVB      
2015 05  25.45500  13 34 27.989  -09 11 17.87  24.7r 15GM55    568  C~2lVB      
2015 06  21.34643  13 33 07.114  -09 05 42.79  24.7r 15GM55    568  C~2lVB      
2015 06  22.30309  13 33 05.574  -09 05 38.66  24.6r 15GM55    568  C~2lVB      
2015 07  12.29701  13 32 56.892  -09 06 30.39  24.6r 15GM55    568  C~2lVB      
2016 02  04.63543  13 51 04.952  -11 03 00.78  25.1w 15GM55    568  C~2lVB      
2016 02  11.61375  13 50 58.908  -11 02 50.09  25.0w 15GM55    568  C~2lVB      
2016 03  11.61710  13 49 36.100  -10 56 50.53  24.8w 15GM55    568  C~2lVB      
2016 03  12.48956  13 49 32.394  -10 56 32.74  24.4w 15GM55    568  C~2lVB      
2016 04  03.48576  13 47 41.856  -10 47 38.87  24.4w 15GM55    568  C~2lVB      
2016 04  09.46692  13 47 07.993  -10 44 52.94  24.7w 15GM55    568  C~2lVB      
2016 05  02.35585  13 44 56.101  -10 34 05.01  24.5w 15GM55    568  C~2lVB      
2016 05  07.35921  13 44 28.524  -10 31 50.56  24.2w 15GM55    568  C~2lVB      
2016 05  29.33148  13 42 43.103  -10 23 28.59  24.7w 15GM55    568  C~2lVB      
2016 06  04.39391  13 42 20.130  -10 21 44.88  24.8w 15GM55    568  C~2lVB      
2016 06  27.31561  13 41 25.351  -10 18 13.29  24.3w 15GM55    568  C~2lVB      
2016 07  07.31185  13 41 19.169  -10 18 21.31  24.8w 15GM55    568  C~2lVB      
2017 03  31.46055  13 56 36.695  -12 00 58.40  24.8w 15GM55    568  C~2lVB      

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     0.05
     2   0.0001     -1.50     0.03      -0.33    -0.15
     3   0.0084   -114.34     0.09      -8.07    -0.13
     4   0.0849  -1803.26    -0.33     -87.10     0.13
     5   0.1450  -3675.74     0.02    -161.62    -0.09
     6   0.1475  -3757.41     0.20    -164.78     0.00
     7   0.1476  -3761.68     0.13    -164.91     0.07
     8   0.1477  -3765.77    -0.07    -164.91     0.25
     9   0.2429  -6756.48     0.16    -305.78    -0.06
    10   0.2652  -7328.53    -0.05    -341.98    -0.01
    11   0.2654  -7332.49    -0.14    -342.31    -0.06
    12   0.3390  -8571.79    -0.01    -467.04     0.00
    13   0.3416  -8594.57    -0.11    -471.53     0.03
    14   0.3964  -8695.58     0.05    -566.72     0.06
    15   0.9640   8821.54    -0.04   -1324.33    -0.03
    16   0.9831   8734.35    -0.03   -1345.68     0.03
    17   1.0625   7464.63    -0.09   -1439.51    -0.11
    18   1.0649   7407.21     0.07   -1442.16     0.13
    19   1.1252   5693.57     0.01   -1519.50     0.00
    20   1.1415   5167.80    -0.02   -1541.54    -0.11
    21   1.2042   3119.38    -0.06   -1628.35     0.04
    22   1.2179   2691.42     0.07   -1647.96     0.05
    23   1.2781   1059.54     0.07   -1735.73    -0.00
    24   1.2947    705.92    -0.10   -1760.49    -0.19
    25   1.3574   -124.53    -0.03   -1853.33    -0.03
    26   1.3848   -206.79     0.10   -1893.61     0.07
    27   2.1162  14625.90     0.02   -2879.48     0.07

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.

15GM55    quality flag:3

Type:         5:2EEE    5:2EEE    5:2EEE

axisobj        55.067    55.122    55.013
ecceobj         0.433     0.434     0.432
incobj          9.046     9.046     9.046
qmin           30.673    30.647    30.690
qmax           81.936    81.816    81.653
amean          55.462    55.462    55.462
amin           54.694    54.652    54.707
amax           56.563    56.481    56.461
emean           0.436     0.436     0.436
emin            0.425     0.425     0.425
emax            0.449     0.449     0.448
imean           8.979     8.994     8.965
imin            8.711     8.692     8.707
imax            9.270     9.302     9.230
excite_mean     0.463     0.463     0.463
fracstop        1.000     1.000     1.000
cjmean          2.955     2.955     2.956

libcent 0       180.1     181.2     179.7
libamp  0       101.0     105.4      97.5
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       190.5     185.1     196.6
kozaiamp        180.0     180.0     180.0