Orbit Fit and Astrometric record for 15GP57

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: 15GP57    
# Created Sun Nov 24 02:10:17 2024
# Orbit generated from Bernstein formalism
# Fitting     34 observations of     34
# Arc:   2.35y
# First observation: 2015/02/17
#  Last observation: 2017/06/26
Preliminary a, adot, b, bdot, g, gdot:
  -0.000109   0.027863   0.000003  -0.002159   0.025966   0.000000
# Chi-squared of fit:    10.48 DOF:     62 RMS:  0.10
# Min/Max residuals:    -0.22    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.734392E-05  2.764771E-02 -1.626286E-06 -2.141182E-03  2.593830E-02 -2.238205E-03
# Covariance matrix:
  1.5221E-13 -2.3254E-14  9.3552E-16 -4.7835E-15  9.7852E-14  1.1726E-12
 -2.3254E-14  3.3382E-13  6.6950E-15 -3.0157E-14  1.8191E-13  7.2933E-12
  9.3552E-16  6.6950E-15  9.4681E-14 -7.2404E-14  4.6245E-15  2.1068E-13
 -4.7835E-15 -3.0157E-14 -7.2404E-14  1.0263E-13 -2.1551E-14 -9.4511E-13
  9.7852E-14  1.8191E-13  4.6245E-15 -2.1551E-14  2.1731E-13  5.2319E-12
  1.1726E-12  7.2933E-12  2.1068E-13 -9.4511E-13  5.2319E-12  2.2846E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.517814 -152.759051    0.844504    0.004732   -0.507533  2457071.023648
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          330.57776 +/-     0.101
Argument of Peri:      214.62735 +/-     0.159
Long of Asc Node:       32.57906 +/-     0.001
Inclination:             4.45011 +/-     0.001
Eccentricity:         0.17204604 +/-    0.0004
Semi-Major Axis:     45.47406308 +/-    0.0067
Time of Perihelion: 2466224.6342 +/-      31.4
Perihelion:          37.65043071 +/-    0.0187
Aphelion:            53.29769544 +/-    0.0195
Period (y)              306.6577 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.11622354 +/-    0.0006
Ecliptic Y          -17.12777031 +/-    0.0003
Ecliptic Z            0.34835387 +/-    0.0000
Ecliptic XDOT         0.00154036 +/-    0.0000
Ecliptic YDOT        -0.00249298 +/-    0.0000
Ecliptic ZDOT        -0.00022804 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.07212589 +/-    0.0006
Geocenter to KBO     38.55302414 +/-    0.0007
# Hcoef:  8.90

The following table shows the complete astrometric record for 15GP57. 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 (15GP57) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.52287  13 41 53.489  -10 00 26.94  25.1r 15GP57    568  C~2nvW      
2015 02  17.56399  13 41 53.415  -10 00 26.38  25.2r 15GP57    568  C~2nvW      
2015 02  20.59770  13 41 46.903  -09 59 51.19  24.9r 15GP57    568  C~2nvW      
2015 03  18.50144  13 40 22.365  -09 52 07.67  25.0r 15GP57    568  C~2nvW      
2015 03  18.54235  13 40 22.200  -09 52 06.79  25.2r 15GP57    568  C~2nvW      
2015 03  20.54594  13 40 13.863  -09 51 20.96  25.1r 15GP57    568  C~2nvW      
2015 04  11.48071  13 38 32.808  -09 42 05.82  24.7r 15GP57    568  C~2nvW      
2015 04  12.38760  13 38 28.417  -09 41 41.75  24.5r 15GP57    568  C~2nvW      
2015 04  12.43323  13 38 28.178  -09 41 40.43  24.5r 15GP57    568  C~2nvW      
2015 04  12.47547  13 38 27.970  -09 41 39.23  24.7r 15GP57    568  C~2nvW      
2015 04  18.44608  13 37 58.802  -09 38 59.41  24.8r 15GP57    568  C~2nvW      
2015 04  18.49382  13 37 58.558  -09 38 58.06  24.8r 15GP57    568  C~2nvW      
2015 05  17.25497  13 35 46.202  -09 27 00.00  24.9r 15GP57    568  C~2nvW      
2015 05  25.45500  13 35 14.514  -09 24 11.73  25.0r 15GP57    568  C~2nvW      
2015 06  21.34643  13 34 03.360  -09 18 11.38  24.7r 15GP57    568  C~2nvW      
2015 06  22.30309  13 34 01.917  -09 18 05.06  24.8r 15GP57    568  C~2nvW      
2015 07  12.29701  13 33 50.704  -09 17 40.95  25.0r 15GP57    568  C~2nvW      
2015 07  19.28682  13 33 55.643  -09 18 23.97  25.5r 15GP57    568  C~2nvW      
2016 02  04.63139  13 48 01.671  -10 42 47.83  23.6w 15GP57    568  C~2nvW      
2016 02  04.63543  13 48 01.673  -10 42 47.86  23.7w 15GP57    568  C~2nvW      
2016 02  11.60966  13 47 55.032  -10 42 14.90  25.3w 15GP57    568  C~2nvW      
2016 02  11.61375  13 47 55.016  -10 42 14.97  25.3w 15GP57    568  C~2nvW      
2016 03  11.60894  13 46 40.732  -10 35 41.55  24.8w 15GP57    568  C~2nvW      
2016 04  03.48577  13 45 02.905  -10 26 55.00  24.9w 15GP57    568  C~2nvW      
2016 04  09.46692  13 44 34.214  -10 24 20.25  25.1w 15GP57    568  C~2nvW      
2016 05  02.35585  13 42 42.842  -10 14 21.38  25.0w 15GP57    568  C~2nvW      
2016 05  07.35921  13 42 19.552  -10 12 16.87  24.9w 15GP57    568  C~2nvW      
2016 05  29.33148  13 40 50.270  -10 04 25.04  25.3w 15GP57    568  C~2nvW      
2016 06  04.39391  13 40 30.648  -10 02 43.93  25.0w 15GP57    568  C~2nvW      
2016 06  27.31561  13 39 42.688  -09 58 51.73  25.3w 15GP57    568  C~2nvW      
2016 07  07.31185  13 39 36.276  -09 58 33.60  25.0w 15GP57    568  C~2nvW      
2017 02  27.65350  13 53 17.028  -11 20 10.68        15GP57    568  C~2nvW      
2017 03  31.45116  13 51 17.192  -11 09 43.72  24.7w 15GP57    568  C~2nvW      
2017 06  26.27262  13 45 35.975  -10 40 08.51  25.0w 15GP57    568  C~2nvW      

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    -0.10       0.00     0.07
     2   0.0001     -1.22     0.02       0.13     0.24
     3   0.0084   -103.64    -0.12      -1.58     0.07
     4   0.0793  -1435.85    -0.08     -18.37    -0.04
     5   0.0795  -1438.44     0.04     -18.42    -0.05
     6   0.0849  -1569.89     0.06     -20.05    -0.04
     7   0.1450  -3163.58    -0.04     -41.40    -0.08
     8   0.1475  -3232.84     0.20     -42.42    -0.12
     9   0.1476  -3236.61    -0.01     -42.47    -0.09
    10   0.1477  -3239.91    -0.02     -42.46    -0.02
    11   0.1641  -3699.95     0.05     -49.46     0.06
    12   0.1642  -3703.80    -0.07     -49.50     0.09
    13   0.2429  -5789.88     0.09     -90.22     0.03
    14   0.2654  -6288.30     0.01    -103.92    -0.15
    15   0.3390  -7401.56    -0.05    -151.75     0.09
    16   0.3416  -7423.79     0.04    -153.66    -0.03
    17   0.3964  -7587.36    -0.12    -191.74     0.00
    18   0.4155  -7503.48     0.13    -205.15    -0.01
    19   0.9640   5983.40    -0.08    -434.75    -0.20
    20   0.9640   5983.43    -0.00    -434.77    -0.22
    21   0.9831   5880.14     0.13    -438.67     0.16
    22   0.9831   5879.95     0.02    -438.82     0.02
    23   1.0625   4715.77     0.20    -459.96    -0.01
    24   1.1252   3179.54    -0.07    -481.88    -0.00
    25   1.1415   2728.83     0.02    -488.43     0.12
    26   1.2042    979.67     0.12    -517.37     0.09
    27   1.2179    614.07    -0.06    -524.46     0.05
    28   1.2781   -785.75    -0.05    -557.87     0.04
    29   1.2947  -1092.53    -0.13    -567.87    -0.08
    30   1.3574  -1837.09    -0.07    -606.59    -0.08
    31   1.3848  -1931.98    -0.06    -623.85    -0.00
    32   2.0291  11128.20    -0.03    -897.24     0.22
    33   2.1162   9252.72    -0.14    -929.43    -0.10
    34   2.3539   3918.35     0.18   -1049.42    -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.

15GP57    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.007    45.020    44.994
ecceobj         0.166     0.167     0.166
incobj          4.467     4.467     4.467
qmin           37.084    37.075    37.113
qmax           53.949    54.030    53.909
amean          45.331    45.345    45.312
amin           44.930    44.952    44.918
amax           45.765    45.796    45.760
emean           0.163     0.164     0.162
emin            0.146     0.147     0.146
emax            0.180     0.180     0.178
imean           3.813     3.820     3.827
imin            2.952     2.954     2.965
imax            4.709     4.726     4.733
excite_mean     0.176     0.177     0.175
fracstop        1.000     1.000     1.000
cjmean          3.079     3.079     3.079

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       182.7     182.8     183.0
kozaiamp        180.0     180.0     179.9