Orbit Fit and Astrometric record for 15GL56

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: 15GL56    
# Created Fri Dec  3 02:13:17 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     34 observations of     34
# Arc:   6.23y
# First observation: 2015/02/17
#  Last observation: 2021/05/12
# Chi-squared of fit:     6.87 DOF:     62 RMS:  0.08
# Min/Max residuals:    -0.16    0.29
# Exact a, adot, b, bdot, g, gdot:
  1.517994E-05  2.578493E-02 -5.202923E-06 -8.241425E-03  2.631063E-02 -1.513407E-03
# Covariance matrix:
  1.8253E-13 -4.8710E-14 -8.4793E-15  1.5886E-14  1.0636E-13 -2.9779E-13
 -4.8710E-14  1.6096E-13  2.8709E-14 -5.6723E-14  6.3584E-14  1.0822E-12
 -8.4793E-15  2.8709E-14  6.9662E-14 -2.8838E-14  9.9096E-15  2.1360E-13
  1.5886E-14 -5.6723E-14 -2.8838E-14  3.6626E-14 -2.0508E-14 -4.2151E-13
  1.0636E-13  6.3584E-14  9.9096E-15 -2.0508E-14  1.5591E-13  3.9689E-13
 -2.9779E-13  1.0822E-12  2.1360E-13 -4.2151E-13  3.9689E-13  8.0382E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.486262 -157.622835    0.798767    0.015111   -0.576659  2457070.990628
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          303.14817 +/-     0.037
Argument of Peri:      240.54213 +/-     0.050
Long of Asc Node:       25.76513 +/-     0.000
Inclination:            17.75503 +/-     0.000
Eccentricity:         0.08380273 +/-    0.0001
Semi-Major Axis:     40.22666180 +/-    0.0023
Time of Perihelion: 2471787.2327 +/-      11.8
Perihelion:          36.85555773 +/-    0.0043
Aphelion:            43.59776587 +/-    0.0045
Period (y)              255.1404 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.97390102 +/-    0.0005
Ecliptic Y          -13.94556854 +/-    0.0002
Ecliptic Z            0.98560432 +/-    0.0000
Ecliptic XDOT         0.00114283 +/-    0.0000
Ecliptic YDOT        -0.00243520 +/-    0.0000
Ecliptic ZDOT        -0.00086130 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.59501720 +/-    0.0005
Geocenter to KBO     38.00750412 +/-    0.0006
# Hcoef:  7.54

The following table shows the complete astrometric record for 15GL56. 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 (15GL56) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.48985  13 25 00.162  -07 19 48.55  23.5r 15GL56    568  C~2nvS      
2015 02  17.53111  13 25 00.043  -07 19 48.09  23.4r 15GL56    568  C~2nvS      
2015 03  18.45830  13 23 15.077  -07 11 00.58  23.4r 15GL56    568  C~2nvS      
2015 03  18.50960  13 23 14.841  -07 10 59.45  23.0r 15GL56    568  C~2nvS      
2015 03  20.51135  13 23 05.733  -07 10 13.17  22.8r 15GL56    568  C~2nvS      
2015 04  11.37862  13 21 18.597  -07 01 11.63  23.0r 15GL56    568  C~2nvS      
2015 04  11.40216  13 21 18.450  -07 01 10.82  23.4r 15GL56    568  C~2nvS      
2015 04  12.35479  13 21 13.626  -07 00 46.84  23.3r 15GL56    568  C~2nvS      
2015 04  12.39573  13 21 13.411  -07 00 45.77  23.4r 15GL56    568  C~2nvS      
2015 04  12.44139  13 21 13.180  -07 00 44.58  23.2r 15GL56    568  C~2nvS      
2015 04  19.27164  13 20 38.65   -06 57 53.0   24.1V 15GL56    W84  C~2zsP      
2015 04  21.27595  13 20 28.61   -06 57 03.4         15GL56    W84  C~2zsP      
2015 04  22.27234  13 20 23.62   -06 56 39.1         15GL56    W84  C~2zsP      
2015 05  25.36134  13 17 58.794  -06 45 30.75  23.2r 15GL56    568  C~2nvS      
2015 07  12.26411  13 16 45.637  -06 43 45.24  23.5r 15GL56    568  C~2nvS      
2015 07  15.25415  13 16 48.013  -06 44 20.68  23.5r 15GL56    568  C~2nvS      
2015 07  19.25345  13 16 52.508  -06 45 16.27  23.7r 15GL56    568  C~2nvS      
2016 02  04.55519  13 30 16.069  -08 20 41.66  23.8w 15GL56    568  C~2nvS      
2016 02  10.54313  13 30 06.960  -08 20 08.37  23.5w 15GL56    568  C~2nvS      
2016 04  03.42913  13 26 48.770  -08 04 15.14  23.6w 15GL56    568  C~2nvS      
2016 04  09.40893  13 26 18.557  -08 01 45.75  23.4w 15GL56    568  C~2nvS      
2016 05  06.30882  13 24 05.480  -07 51 00.71  23.5w 15GL56    568  C~2nvS      
2016 05  28.27599  13 22 36.977  -07 44 24.54  23.5w 15GL56    568  C~2nvS      
2016 05  28.28005  13 22 36.964  -07 44 24.51  23.5w 15GL56    568  C~2nvS      
2016 05  28.28814  13 22 36.937  -07 44 24.33  23.5w 15GL56    568  C~2nvS      
2016 06  04.35749  13 22 15.107  -07 42 58.00  23.6w 15GL56    568  C~2nvS      
2016 06  04.36154  13 22 15.094  -07 42 58.06  23.7w 15GL56    568  C~2nvS      
2016 06  27.28890  13 21 32.862  -07 41 10.91  23.5w 15GL56    568  C~2nvS      
2016 07  07.29150  13 21 29.408  -07 41 54.19  23.9w 15GL56    568  C~2nvS      
2017 03  28.57437  13 32 15.609  -09 06 44.29        15GL56    568  C~2nvS      
2017 03  29.43565  13 32 11.435  -09 06 23.99  23.6w 15GL56    568  C~2nvS      
2021 05  12.210920 13 48 43.990  -12 49 00.38  23.5G 15GL56    G37  C~4pVn      
2021 05  12.262680 13 48 43.743  -12 48 59.23        15GL56    G37  C~4pVn      
2021 05  12.310510 13 48 43.511  -12 48 58.19        15GL56    G37  C~4pVn      

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     0.08       0.00     0.02
     2   0.0001      0.00    -0.07       0.00    -0.02
     3   0.0793      0.00    -0.01       0.00     0.08
     4   0.0795      0.00    -0.01       0.00     0.04
     5   0.0849      0.00    -0.06       0.00    -0.00
     6   0.1448      0.00     0.29       0.00    -0.16
     7   0.1449      0.00    -0.09       0.00     0.05
     8   0.1475      0.00    -0.08       0.00    -0.09
     9   0.1476      0.00    -0.14       0.00    -0.06
    10   0.1477      0.00    -0.07       0.00    -0.02
    11   0.1664      0.00     0.10       0.00     0.01
    12   0.1719      0.00     0.25       0.00     0.18
    13   0.1746      0.00    -0.03       0.00     0.11
    14   0.2652      0.00     0.00       0.00    -0.05
    15   0.3964      0.00    -0.06       0.00    -0.01
    16   0.4046      0.00     0.00       0.00     0.16
    17   0.4155      0.00    -0.04       0.00     0.09
    18   0.9639      0.00     0.05       0.00    -0.04
    19   0.9803      0.00    -0.09       0.00    -0.02
    20   1.1251      0.00    -0.01       0.00    -0.00
    21   1.1415      0.00    -0.04       0.00     0.00
    22   1.2151      0.00     0.08       0.00     0.03
    23   1.2753      0.00    -0.02       0.00    -0.03
    24   1.2753      0.00    -0.00       0.00    -0.05
    25   1.2753      0.00     0.01       0.00     0.02
    26   1.2946      0.00    -0.01       0.00    -0.01
    27   1.2947      0.00    -0.03       0.00    -0.12
    28   1.3574      0.00    -0.03       0.00    -0.01
    29   1.3848      0.00    -0.06       0.00    -0.06
    30   2.1084      0.00    -0.12       0.00    -0.04
    31   2.1107      0.00    -0.04       0.00     0.02
    32   6.2306      0.00    -0.03       0.00     0.03
    33   6.2307      0.00     0.05       0.00     0.03
    34   6.2309      0.00     0.05       0.00    -0.00

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.

15GL56    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        39.886    39.886    39.886
ecceobj         0.082     0.082     0.082
incobj         17.828    17.828    17.828
qmin           36.012    35.958    35.990
qmax           44.325    44.363    44.634
amean          40.114    40.107    40.113
amin           39.789    39.762    39.782
amax           40.456    40.455    40.475
emean           0.077     0.078     0.080
emin            0.058     0.056     0.060
emax            0.098     0.098     0.104
imean          16.667    16.655    16.694
imin           15.549    15.503    15.549
imax           17.823    17.823    17.870
excite_mean     0.297     0.297     0.298
fracstop        1.000     1.000     1.000
cjmean          2.955     2.955     2.954

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       182.2     182.4     182.0
kozaiamp        180.0     180.0     180.0