Orbit Fit and Astrometric record for 15GP55

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: 15GP55    
# Created Wed Feb 20 02:10:31 2019
# Orbit generated from Bernstein formalism
# Fitting   33 observations of   34
# Arc:   2.11y
# First observation: 2015/02/17
#  Last observation: 2017/03/30
Preliminary a, adot, b, bdot, g, gdot:
  -0.000143   0.023335  -0.000003   0.004236   0.025145   0.000000
# Chi-squared of fit:     8.32 DOF:   60 RMS:  0.09
# Min/Max residuals:    -0.27    0.16
# Exact a, adot, b, bdot, g, gdot:
  1.453521E-05  2.316537E-02  2.200871E-06  4.206248E-03  2.515903E-02 -7.760016E-04
# Covariance matrix:
  2.2413E-13 -9.0300E-15 -5.9038E-15  2.6273E-14  1.7914E-13  3.7324E-12
 -9.0300E-15  2.4628E-13 -9.6345E-15  4.6010E-14  1.5594E-13  6.5417E-12
 -5.9038E-15 -9.6345E-15  1.0235E-13 -9.3160E-14 -1.2634E-14 -5.9997E-13
  2.6273E-14  4.6010E-14 -9.3160E-14  1.5800E-13  5.8398E-14  2.8976E-12
  1.7914E-13  1.5594E-13 -1.2634E-14  5.8398E-14  2.8882E-13  8.2999E-12
  3.7324E-12  6.5417E-12 -5.9997E-13  2.8976E-12  8.2999E-12  4.1204E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.072201 -153.442921    0.838461    0.009830   -0.517382  2457071.015468
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          209.13814 +/-     0.350
Argument of Peri:      162.45388 +/-     0.349
Long of Asc Node:      199.56385 +/-     0.001
Inclination:            10.36165 +/-     0.001
Eccentricity:         0.11525476 +/-    0.0003
Semi-Major Axis:     36.50170765 +/-    0.0033
Time of Perihelion: 2490826.0478 +/-      78.2
Perihelion:          32.29471226 +/-    0.0121
Aphelion:            40.70870304 +/-    0.0123
Period (y)              220.5352 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -36.38769455 +/-    0.0008
Ecliptic Y          -17.24869262 +/-    0.0004
Ecliptic Z            0.74384560 +/-    0.0000
Ecliptic XDOT         0.00120660 +/-    0.0000
Ecliptic YDOT        -0.00221891 +/-    0.0000
Ecliptic ZDOT         0.00045616 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.27573733 +/-    0.0007
Geocenter to KBO     39.74716059 +/-    0.0008
# Hcoef:  8.29

The following table shows the complete astrometric record for 15GP55. 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 (15GP55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.51469  13 40 06.737  -09 14 39.08  24.4r 15GP55    568  C~2lVB      
2015 02  17.55579  13 40 06.651  -09 14 38.56  24.3r 15GP55    568  C~2lVB      
2015 03  18.49249  13 38 36.447  -09 04 10.49  24.2r 15GP55    568  C~2lVB      
2015 03  18.53407  13 38 36.251  -09 04 09.53  24.6r 15GP55    568  C~2lVB      
2015 03  20.53726  13 38 28.074  -09 03 15.42  24.1r 15GP55    568  C~2lVB      
2015 04  11.47256  13 36 49.175  -08 52 37.73  23.7r 15GP55    568  C~2lVB      
2015 04  12.37938  13 36 44.880  -08 52 10.32  24.2r 15GP55    568  C~2lVB      
2015 04  12.42509  13 36 44.662  -08 52 08.82  24.5r 15GP55    568  C~2lVB      
2015 04  12.46730  13 36 44.450  -08 52 07.69  23.9r 15GP55    568  C~2lVB      
2015 04  18.43790  13 36 15.990  -08 49 07.57  24.1r 15GP55    568  C~2lVB      
2015 04  18.48560  13 36 15.767  -08 49 06.21  24.1r 15GP55    568  C~2lVB      
2015 05  16.28656  13 34 10.827  -08 36 04.12  23.9r 15GP55    568  C~2lVB      
2015 05  17.24686  13 34 06.975  -08 35 40.31  24.0r 15GP55    568  C~2lVB      
2015 05  25.38864  13 33 36.441  -08 32 30.39  24.2r 15GP55    568  C~2lVB      
2015 05  25.44647  13 33 36.237  -08 32 29.08  24.2r 15GP55    568  C~2lVB      
2015 06  21.33827  13 32 27.228  -08 25 17.77  24.2r 15GP55    568  C~2lVB      
2015 06  22.29486  13 32 25.827  -08 25 08.74  24.3r 15GP55    568  C~2lVB      
2015 07  12.28879  13 32 14.963  -08 23 50.74  24.3r 15GP55    568  C~2lVB      
2015 07  15.27909  13 32 16.485  -08 23 57.77  24.3r 15GP55    568  C~2lVB      
2015 07  19.27863  13 32 19.728  -08 24 14.03  24.2r 15GP55    568  C~2lVB      
2016 02  04.61430  13 45 47.195  -09 32 24.40  24.6w 15GP55    568  C~2lVB      
2016 02  11.59752  13 45 40.057  -09 31 12.23  24.4w 15GP55    568  C~2lVB      
2016 03  11.60487  13 44 25.724  -09 22 08.03  24.5w 15GP55    568  C~2lVB      
2016 04  03.47362  13 42 49.875  -09 11 42.82  24.3w 15GP55    568  C~2lVB      
2016 04  09.45477  13 42 21.883  -09 08 45.45  24.2w 15GP55    568  C~2lVB      
2016 05  01.46556  13 40 37.624  -08 57 56.14  24.3w 15GP55    568  C~2lVB      
2016 05  02.33963  13 40 33.634  -08 57 31.59  24.3w 15GP55    568  C~2lVB      
2016 05  07.34298  13 40 11.063  -08 55 12.92  24.5w 15GP55    568  C~2lVB      
2016 05  29.32744  13 38 44.637  -08 46 26.13  24.6w 15GP55    568  C~2lVB      
2016 06  04.38987  13 38 25.709  -08 44 31.56  24.2w 15GP55    568  C~2lVB      
2016 06  27.32010  13 37 39.523  -08 39 51.90  24.8w 15GP55    568  C~2lVB      
2016 06  27.32513  13 37 39.504  -08 39 51.71  24.7w 15GP55    568  C~2lVB      
2016 07  07.31590  13 37 33.419  -08 39 12.94  24.5w 15GP55    568  C~2lVB      
2017 03  30.49709  13 48 37.201  -09 28 57.58  24.3w 15GP55    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     0.01       0.00     0.09
  2   0.0001     -1.38     0.06       0.03    -0.02
  3   0.0793  -1473.87     0.08     103.55     0.13
  4   0.0795  -1476.92    -0.20     103.39    -0.14
  5   0.0849  -1609.42    -0.06     110.06     0.04
  6   0.1450  -3206.47     0.02     173.92    -0.07
  7   0.1475  -3275.75     0.06     176.38     0.00
  8   0.1476  -3279.31     0.06     176.61     0.13
  9   0.1477  -3282.65     0.01     176.52    -0.04
 10   0.1641  -3741.21    -0.07     191.34    -0.03
 11   0.1642  -3744.79     0.08     191.40    -0.05
 12   0.2403  -5755.93     0.15     246.46     0.05
 13   0.2429  -5817.86    -0.10     247.82    -0.10
 14   0.2652  -6309.25     0.02     259.65     0.07
 15   0.2654  -6312.55     0.05     259.77     0.13
 16   0.3390  -7424.39    -0.03     287.75    -0.07
 17   0.3416  -7447.07    -0.05     288.57    -0.04
 18   0.3964  -7625.87    -0.12     302.29    -0.03
 19   0.4046  -7602.24 (   0.51)    304.00 (  -0.13)
 20   0.4155  -7551.44     0.03     306.45    -0.08
 21   0.9640   5086.37     0.07     812.55     0.05
 22   0.9831   4961.91    -0.02     842.30    -0.04
 23   1.0625   3739.64    -0.11     957.66    -0.11
 24   1.1251   2190.59     0.03    1033.12     0.02
 25   1.1415   1739.99     0.04    1049.91     0.06
 26   1.2018     65.36    -0.19    1100.42     0.13
 27   1.2042      1.36     0.06    1102.03     0.05
 28   1.2179   -360.60    -0.01    1110.87     0.07
 29   1.2781  -1745.41    -0.01    1139.87     0.07
 30   1.2947  -2048.49     0.07    1145.28     0.05
 31   1.3574  -2788.21     0.16    1158.25    -0.27
 32   1.3575  -2788.54    -0.08    1158.32    -0.20
 33   1.3848  -2886.71    -0.01    1161.80     0.02
 34   2.1136   7365.52     0.00    1901.42     0.09

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.

15GP55    quality flag:3

Type:           4:3E      4:3E      4:3E

axisobj        36.238    36.246    36.231
ecceobj         0.124     0.124     0.123
incobj         10.412    10.412    10.412
qmin           31.208    31.162    31.168
qmax           42.014    41.984    42.015
amean          36.478    36.478    36.478
amin           36.166    36.182    36.161
amax           36.826    36.801    36.813
emean           0.113     0.114     0.113
emin            0.084     0.087     0.085
emax            0.143     0.142     0.144
imean          12.249    12.189    12.317
imin           10.364    10.356    10.372
imax           14.119    14.065    14.152
excite_mean     0.241     0.240     0.242
fracstop        1.000     1.000     1.000
cjmean          2.962     2.963     2.962

libcent 0       179.8     180.9     180.5
libamp  0        52.4      47.6      53.7
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       180.1     180.0     180.0
kozaiamp        180.0     180.0     180.0