Orbit Fit and Astrometric record for 15GT55

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: 15GT55    
# Created Fri Dec  3 02:13:16 2021
# Orbit generated from Bernstein formalism
# Fitting     34 observations of     34
# Arc:   2.35y
# First observation: 2015/02/17
#  Last observation: 2017/06/25
Preliminary a, adot, b, bdot, g, gdot:
  -0.000073   0.033406   0.000011  -0.006919   0.028844   0.000000
# Chi-squared of fit:    11.21 DOF:     62 RMS:  0.10
# Min/Max residuals:    -0.31    0.31
# Exact a, adot, b, bdot, g, gdot:
  1.861805E-05  3.320181E-02 -3.965681E-06 -6.850307E-03  2.885219E-02 -2.193337E-03
# Covariance matrix:
  1.7041E-13 -4.5199E-14 -2.2437E-17 -1.2255E-15  9.0497E-14  8.8497E-14
 -4.5199E-14  4.1076E-13  3.3317E-14 -1.2350E-13  1.9097E-13  8.4038E-12
 -2.2437E-17  3.3317E-14  1.0309E-13 -8.2699E-14  1.6757E-14  8.8062E-13
 -1.2255E-15 -1.2350E-13 -8.2699E-14  1.3323E-13 -6.3559E-14 -3.2540E-12
  9.0497E-14  1.9097E-13  1.6757E-14 -6.3559E-14  1.9603E-13  4.3306E-12
  8.8497E-14  8.4038E-12  8.8062E-13 -3.2540E-12  4.3306E-12  2.2138E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.571373 -153.944003    0.833175    0.014561   -0.525747  2457071.093388
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          345.50519 +/-     0.064
Argument of Peri:      197.15503 +/-     0.114
Long of Asc Node:       32.16926 +/-     0.000
Inclination:            11.73300 +/-     0.000
Eccentricity:         0.25252341 +/-    0.0002
Semi-Major Axis:     46.21397826 +/-    0.0052
Time of Perihelion: 2461690.7808 +/-      20.3
Perihelion:          34.54386683 +/-    0.0101
Aphelion:            57.88408969 +/-    0.0114
Period (y)              314.1725 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -31.96630693 +/-    0.0005
Ecliptic Y          -14.70090901 +/-    0.0002
Ecliptic Z            0.95030253 +/-    0.0000
Ecliptic XDOT         0.00155114 +/-    0.0000
Ecliptic YDOT        -0.00275240 +/-    0.0000
Ecliptic ZDOT        -0.00065541 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.19750814 +/-    0.0004
Geocenter to KBO     34.65941183 +/-    0.0005
# Hcoef:  9.34

The following table shows the complete astrometric record for 15GT55. 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 (15GT55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.59261  13 38 57.013  -08 35 52.27  25.2r 15GT55    568  C~2lVC      
2015 02  17.63360  13 38 56.921  -08 35 51.91  24.9r 15GT55    568  C~2lVC      
2015 02  20.48657  13 38 50.036  -08 35 16.79  24.9r 15GT55    568  C~2lVC      
2015 03  18.57107  13 37 14.840  -08 27 04.58  24.9r 15GT55    568  C~2lVC      
2015 03  18.61845  13 37 14.628  -08 27 03.43  24.6r 15GT55    568  C~2lVC      
2015 04  11.50958  13 35 13.537  -08 16 42.04  24.9r 15GT55    568  C~2lVC      
2015 04  13.37381  13 35 03.538  -08 15 51.20  26.0r 15GT55    568  C~2lVC      
2015 04  13.41479  13 35 03.303  -08 15 50.12  25.0r 15GT55    568  C~2lVC      
2015 04  13.51735  13 35 02.744  -08 15 47.25  24.4r 15GT55    568  C~2lVC      
2015 05  16.28656  13 32 15.157  -08 02 10.66  24.5r 15GT55    568  C~2lVC      
2015 05  18.33721  13 32 06.017  -08 01 29.18  24.4r 15GT55    568  C~2lVC      
2015 06  20.28725  13 30 22.337  -07 54 46.48  25.1r 15GT55    568  C~2lVC      
2015 06  20.32802  13 30 22.267  -07 54 46.24  24.8r 15GT55    568  C~2lVC      
2015 06  22.29486  13 30 19.116  -07 54 40.69  24.9r 15GT55    568  C~2lVC      
2015 07  12.28879  13 30 09.256  -07 55 56.37  24.8r 15GT55    568  C~2lVC      
2015 07  15.27909  13 30 11.348  -07 56 28.53  24.3r 15GT55    568  C~2lVC      
2015 07  19.27863  13 30 15.602  -07 57 20.27  25.0r 15GT55    568  C~2lVC      
2016 02  04.61431  13 45 54.673  -09 40 22.63  25.1w 15GT55    568  C~2lVC      
2016 02  11.59753  13 45 47.085  -09 39 53.97  25.3w 15GT55    568  C~2lVC      
2016 03  11.60487  13 44 24.000  -09 33 14.87  24.1w 15GT55    568  C~2lVC      
2016 04  03.47362  13 42 35.469  -09 24 13.66  24.7w 15GT55    568  C~2lVC      
2016 04  03.47768  13 42 35.439  -09 24 13.52  25.0w 15GT55    568  C~2lVC      
2016 04  09.45477  13 42 03.704  -09 21 35.67  24.8w 15GT55    568  C~2lVC      
2016 04  09.45883  13 42 03.685  -09 21 35.58  24.8w 15GT55    568  C~2lVC      
2016 05  01.46556  13 40 05.415  -09 11 56.26  23.8w 15GT55    568  C~2lVC      
2016 05  02.33963  13 40 00.893  -09 11 34.14  25.3w 15GT55    568  C~2lVC      
2016 05  07.34298  13 39 35.322  -09 09 32.20  25.4w 15GT55    568  C~2lVC      
2016 05  29.32744  13 37 57.777  -09 02 08.32  24.9w 15GT55    568  C~2lVC      
2016 06  04.38987  13 37 36.547  -09 00 40.34  25.3w 15GT55    568  C~2lVC      
2016 07  07.31590  13 36 39.640  -08 58 26.67  25.2w 15GT55    568  C~2lVC      
2017 03  30.49241  13 49 45.298  -10 30 05.56  24.8w 15GT55    568  C~2lVC      
2017 05  24.25622  13 45 03.184  -10 07 46.50  24.8w 15GT55    568  C~2lVC      
2017 06  25.27303  13 43 27.507  -10 01 31.42  25.2w 15GT55    568  C~2lVC      
2017 06  25.28243  13 43 27.483  -10 01 31.58  25.2w 15GT55    568  C~2lVC      

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    -0.09       0.00     0.04
     2   0.0001     -1.40     0.03      -0.16    -0.03
     3   0.0079   -109.31    -0.01      -4.32    -0.00
     4   0.0793  -1603.93    -0.14     -56.64    -0.12
     5   0.0795  -1607.28    -0.02     -56.71    -0.05
     6   0.1449  -3507.61    -0.01    -130.12    -0.02
     7   0.1500  -3664.41     0.20    -136.75     0.16
     8   0.1501  -3668.05     0.07    -137.01     0.07
     9   0.1504  -3676.83     0.09    -137.35     0.16
    10   0.2401  -6293.25     0.31    -284.18     0.17
    11   0.2457  -6434.91     0.11    -295.18    -0.11
    12   0.3359  -8017.59    -0.12    -484.18    -0.18
    13   0.3360  -8018.65    -0.11    -484.33    -0.07
    14   0.3414  -8064.31    -0.12    -496.34    -0.06
    15   0.3962  -8173.04    -0.13    -620.54    -0.08
    16   0.4043  -8132.28    -0.06    -639.08     0.05
    17   0.4153  -8054.40    -0.02    -664.07    -0.03
    18   0.9638   7165.76    -0.31   -1390.81     0.02
    19   0.9829   7050.58     0.04   -1404.09    -0.02
    20   1.0623   5759.04     0.08   -1470.48     0.02
    21   1.1249   4065.01     0.09   -1540.79     0.03
    22   1.1249   4064.55    -0.03   -1540.82     0.01
    23   1.1413   3569.35     0.05   -1562.21     0.06
    24   1.1413   3569.06     0.11   -1562.22     0.06
    25   1.2016   1726.70    -0.07   -1652.10    -0.14
    26   1.2040   1656.26     0.06   -1655.62     0.18
    27   1.2177   1259.08     0.03   -1678.53     0.05
    28   1.2779   -248.51     0.11   -1786.98    -0.09
    29   1.2944   -573.55    -0.06   -1818.87    -0.09
    30   1.3846  -1407.82    -0.09   -1999.99    -0.00
    31   2.1133  11419.01    -0.08   -2970.83     0.00
    32   2.2633   7042.38     0.09   -3199.28     0.04
    33   2.3509   5587.21     0.02   -3354.53     0.09
    34   2.3510   5586.94    -0.03   -3354.80    -0.14

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.

15GT55    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        45.696    45.705    45.688
ecceobj         0.245     0.245     0.245
incobj         11.772    11.772    11.772
qmin           32.846    33.920    33.604
qmax           59.518    58.750    59.047
amean          45.712    46.009    45.984
amin           44.948    45.563    45.215
amax           46.739    46.583    46.794
emean           0.254     0.244     0.245
emin            0.228     0.234     0.218
emax            0.282     0.262     0.267
imean          10.388    10.998    10.501
imin            8.853    10.338     8.682
imax           12.143    11.692    12.325
excite_mean     0.312     0.310     0.305
fracstop        1.000     1.000     1.000
cjmean          3.003     3.007     3.011

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       182.9     178.7     182.6
kozaiamp        179.9     179.9     180.0