Orbit Fit and Astrometric record for 15GP56

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: 15GP56    
# Created Tue Dec  7 02:13:23 2021
# Orbit generated from Bernstein formalism
# Fitting     32 observations of     33
# Arc:   2.25y
# First observation: 2015/02/17
#  Last observation: 2017/05/18
Preliminary a, adot, b, bdot, g, gdot:
  -0.000214   0.025302   0.000000   0.014732   0.027105   0.000000
# Chi-squared of fit:    11.63 DOF:     58 RMS:  0.11
# Min/Max residuals:    -0.29    0.35
# Exact a, adot, b, bdot, g, gdot:
  1.515104E-05  2.523674E-02  7.621882E-06  1.472928E-02  2.726471E-02  4.504658E-03
# Covariance matrix:
  1.6783E-13 -5.4075E-14 -4.5678E-15  2.1702E-14  1.1313E-13  7.8669E-13
 -5.4075E-14  4.7310E-13 -7.3118E-14  3.5723E-13  1.7403E-13  1.2697E-11
 -4.5678E-15 -7.3118E-14  9.8745E-14 -1.4852E-13 -3.8797E-14 -2.7523E-12
  2.1702E-14  3.5723E-13 -1.4852E-13  5.1388E-13  1.8879E-13  1.3446E-11
  1.1313E-13  1.7403E-13 -3.8797E-14  1.8879E-13  2.1926E-13  6.7292E-12
  7.8669E-13  1.2697E-11 -2.7523E-12  1.3446E-11  6.7292E-12  4.7794E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.338333 -155.728220    0.817362    0.003397   -0.550183  2457070.994728
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:           42.43207 +/-     0.062
Argument of Peri:      302.32399 +/-     0.125
Long of Asc Node:      202.43780 +/-     0.000
Inclination:            30.15263 +/-     0.001
Eccentricity:         0.17504749 +/-    0.0007
Semi-Major Axis:     41.94588519 +/-    0.0129
Time of Perihelion: 2445374.8550 +/-      16.2
Perihelion:          34.60336332 +/-    0.0321
Aphelion:            49.28840706 +/-    0.0339
Period (y)              271.6704 +/-      0.13
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -34.27513831 +/-    0.0006
Ecliptic Y          -14.55752995 +/-    0.0003
Ecliptic Z            0.21685275 +/-    0.0000
Ecliptic XDOT         0.00063368 +/-    0.0000
Ecliptic YDOT        -0.00249812 +/-    0.0000
Ecliptic ZDOT         0.00148181 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.23914351 +/-    0.0005
Geocenter to KBO     36.67745241 +/-    0.0006
# Hcoef:  8.94

The following table shows the complete astrometric record for 15GP56. 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 (15GP56) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.49395  13 30 24.375  -09 05 46.17  24.5r 15GP56    568  C~2nvS      
2015 02  17.53521  13 30 24.273  -09 05 45.62  24.6r 15GP56    568  C~2nvS      
2015 02  20.46602  13 30 17.253  -09 04 36.63  25.1r 15GP56    568  C~2nvS      
2015 03  18.46248  13 28 45.814  -08 51 35.48  24.8r 15GP56    568  C~2nvS      
2015 03  18.51370  13 28 45.578  -08 51 33.83  24.6r 15GP56    568  C~2nvS      
2015 03  20.51543  13 28 36.788  -08 50 23.36  24.4r 15GP56    568  C~2nvS      
2015 04  12.35890  13 26 47.213  -08 36 07.74  24.6r 15GP56    568  C~2nvS      
2015 04  12.39986  13 26 47.007  -08 36 05.90  24.7r 15GP56    568  C~2nvS      
2015 04  12.44683  13 26 46.772  -08 36 04.26  24.3r 15GP56    568  C~2nvS      
2015 04  14.45679  13 26 36.712  -08 34 46.43  24.8r 15GP56    568  C~2nvS      
2015 04  16.39466  13 26 27.051  -08 33 31.86  24.5r 15GP56    568  C~2nvS      
2015 04  16.40115  13 26 27.016  -08 33 31.30  24.7r 15GP56    568  C~2nvS      
2015 04  18.41739  13 26 16.949  -08 32 14.21  24.1r 15GP56    568  C~2nvS      
2015 04  18.46519  13 26 16.712  -08 32 12.32  23.9r 15GP56    568  C~2nvS      
2015 05  16.26178  13 24 08.489  -08 15 29.73  23.9r 15GP56    568  C~2nvS      
2015 05  25.36747  13 23 34.283  -08 10 50.16  24.6r 15GP56    568  C~2nvS      
2015 05  25.40947  13 23 34.140  -08 10 48.83  25.2r 15GP56    568  C~2nvS      
2015 05  25.42508  13 23 34.077  -08 10 48.23  25.0r 15GP56    568  C~2nvS      
2015 06  21.31770  13 22 29.792  -08 00 48.08  24.6r 15GP56    568  C~2nvS      
2015 06  22.27415  13 22 28.672  -08 00 33.82  24.6r 15GP56    568  C~2nvS      
2015 07  12.26825  13 22 25.261  -07 57 38.62  24.8r 15GP56    568  C~2nvS      
2015 07  15.25837  13 22 28.113  -07 57 32.54  25.5r 15GP56    568  C~2nvS      
2015 07  19.25818  13 22 33.298  -07 57 32.59  24.9r 15GP56    568  C~2nvS      
2016 02  04.57138  13 37 24.640  -08 54 40.20  25.6w 15GP56    568  C~2nvS      
2016 02  04.59812  13 37 24.615  -08 54 39.85  24.9w 15GP56    568  C~2nvS      
2016 02  10.55937  13 37 17.924  -08 52 57.08  25.0w 15GP56    568  C~2nvS      
2016 02  10.61712  13 37 17.835  -08 52 55.90  24.3w 15GP56    568  C~2nvS      
2016 03  11.56702  13 35 55.540  -08 39 45.55  24.3w 15GP56    568  C~2nvS      
2016 04  09.43859  13 33 44.192  -08 22 22.36  24.5w 15GP56    568  C~2nvS      
2016 05  02.31122  13 31 51.943  -08 08 08.26        15GP56    568  C~2nvS      
2016 05  06.32100  13 31 33.377  -08 05 47.09  24.8w 15GP56    568  C~2nvS      
2017 03  29.47339  13 41 20.711  -08 13 55.36        15GP56    568  C~2nvS      
2017 05  18.26658  13 37 24.561  -07 44 17.38  24.8w 15GP56    568  C~2nvS      

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    -0.11       0.00     0.19
     2   0.0001     -1.61    -0.03      -0.04    -0.19
     3   0.0081   -123.66     0.07      25.94    -0.03
     4   0.0793  -1670.85    -0.03     254.05     0.04
     5   0.0795  -1674.71    -0.10     254.29    -0.13
     6   0.0849  -1821.80    -0.09     271.82    -0.02
     7   0.1475  -3647.82     0.18     467.75    -0.29
     8   0.1476  -3651.34     0.11     468.33    -0.03
     9   0.1477  -3655.18     0.23     468.57    -0.17
    10   0.1532  -3822.64    -0.12     485.75     0.07
    11   0.1585  -3983.42     0.08     502.08     0.07
    12   0.1585  -3984.11    -0.06     502.41     0.35
    13   0.1641  -4151.42    -0.09     518.83    -0.11
    14   0.1642  -4155.39    -0.04     519.28    -0.03
    15   0.2403  -6295.55     0.17     745.87     0.04
    16   0.2652  -6871.46     0.05     817.01    -0.08
    17   0.2653  -6873.93     0.08     817.46     0.06
    18   0.2654  -6875.02    -0.08     817.67     0.16
    19   0.3390  -7985.83    -0.00    1020.19    -0.01
    20   0.3416  -8006.61    -0.01    1027.25     0.02
    21   0.3964  -8119.01    -0.11    1171.15    -0.08
    22   0.4046  -8081.89    -0.10    1192.57     0.13
    23   0.4155  -8010.27 (  -0.19)   1221.19 (   0.48)
    24   0.9639   5555.35    -0.01    2893.51    -0.01
    25   0.9640   5554.88     0.01    2893.70    -0.07
    26   0.9803   5425.09     0.08    2953.50     0.06
    27   0.9805   5423.44     0.03    2954.12     0.13
    28   1.0625   3998.81    -0.12    3247.12     0.09
    29   1.1415   1803.42     0.05    3508.21    -0.02
    30   1.2042    -60.13    -0.03    3693.65    -0.03
    31   1.2151   -368.44    -0.06    3723.98    -0.05
    32   2.1108   7940.24    -0.03    6443.89    -0.05
    33   2.2472   4021.46     0.06    6830.95    -0.01

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.

15GP56    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        41.588    41.629    41.547
ecceobj         0.169     0.171     0.167
incobj         30.264    30.264    30.264
qmin           33.934    33.841    34.026
qmax           50.094    50.003    49.719
amean          41.809    41.804    41.721
amin           41.447    41.444    41.370
amax           42.215    42.224    42.093
emean           0.166     0.167     0.164
emin            0.145     0.149     0.145
emax            0.187     0.187     0.182
imean          30.634    30.650    30.618
imin           30.136    30.189    30.151
imax           31.047    31.089    31.062
excite_mean     0.536     0.536     0.535
fracstop        1.000     1.000     1.000
cjmean          2.720     2.720     2.721

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       177.7     170.8     175.8
kozaiamp        179.9     180.0     179.9