Orbit Fit and Astrometric record for 15GB55

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: 15GB55    
# Created Thu Apr 18 01:10:30 2019
# Orbit generated from Bernstein formalism
# Fitting   36 observations of   36
# Arc:   2.11y
# First observation: 2015/02/17
#  Last observation: 2017/03/30
Preliminary a, adot, b, bdot, g, gdot:
  -0.000145   0.023561  -0.000016   0.004271   0.022965   0.000000
# Chi-squared of fit:    12.60 DOF:   66 RMS:  0.10
# Min/Max residuals:    -0.31    0.40
# Exact a, adot, b, bdot, g, gdot:
  1.599826E-05  2.321057E-02  2.818860E-06  4.186398E-03  2.291992E-02 -7.058155E-03
# Covariance matrix:
  1.9130E-13 -1.0082E-13 -1.9049E-15  3.5595E-15  1.0241E-13  4.9314E-13
 -1.0082E-13  3.6031E-13 -1.6942E-14  6.5788E-14  1.1407E-13  8.5373E-12
 -1.9049E-15 -1.6942E-14  1.0901E-13 -9.8003E-14 -1.1465E-14 -6.4537E-13
  3.5595E-15  6.5788E-14 -9.8003E-14  1.4689E-13  3.9629E-14  2.4702E-12
  1.0241E-13  1.1407E-13 -1.1465E-14  3.9629E-14  1.9139E-13  5.1825E-12
  4.9314E-13  8.5373E-12 -6.4537E-13  2.4702E-12  5.1825E-12  3.2085E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.139887 -153.383205    0.838170    0.028508   -0.517165  2457071.105668
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          331.81661 +/-     0.033
Argument of Peri:       81.86614 +/-     0.058
Long of Asc Node:      188.96566 +/-     0.001
Inclination:            10.76708 +/-     0.001
Eccentricity:         0.41099516 +/-    0.0008
Semi-Major Axis:     62.35279291 +/-    0.0483
Time of Perihelion: 2471149.5404 +/-       2.7
Perihelion:          36.72609679 +/-    0.0572
Aphelion:            87.97948903 +/-    0.0843
Period (y)              492.3706 +/-      0.57
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -39.78910279 +/-    0.0007
Ecliptic Y          -19.00063035 +/-    0.0004
Ecliptic Z            2.38992392 +/-    0.0000
Ecliptic XDOT         0.00201564 +/-    0.0000
Ecliptic YDOT        -0.00209487 +/-    0.0000
Ecliptic ZDOT         0.00045324 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.15776705 +/-    0.0007
Geocenter to KBO     43.63017577 +/-    0.0008
# Hcoef:  8.58

The following table shows the complete astrometric record for 15GB55. 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 (15GB55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.60489  13 43 20.530  -07 20 10.25  24.8r 15GB55    568  C~2lV9      
2015 02  17.64586  13 43 20.459  -07 20 09.70  24.8r 15GB55    568  C~2lV9      
2015 02  20.63905  13 43 15.021  -07 19 18.89  25.2r 15GB55    568  C~2lV9      
2015 04  11.52247  13 40 27.578  -06 59 09.85  24.5r 15GB55    568  C~2lV9      
2015 04  13.38609  13 40 19.721  -06 58 18.82  25.3r 15GB55    568  C~2lV9      
2015 04  13.44737  13 40 19.450  -06 58 17.21  24.7r 15GB55    568  C~2lV9      
2015 04  13.45145  13 40 19.427  -06 58 17.07  24.7r 15GB55    568  C~2lV9      
2015 04  13.45555  13 40 19.417  -06 58 16.87  24.7r 15GB55    568  C~2lV9      
2015 04  13.52960  13 40 19.087  -06 58 14.90  24.8r 15GB55    568  C~2lV9      
2015 04  19.49744  13 39 53.732  -06 55 33.41  25.1r 15GB55    568  C~2lV9      
2015 04  19.55519  13 39 53.488  -06 55 31.68  24.6r 15GB55    568  C~2lV9      
2015 05  18.34948  13 37 58.651  -06 43 53.48  25.0r 15GB55    568  C~2lV9      
2015 06  20.29948  13 36 33.554  -06 36 10.48  24.9r 15GB55    568  C~2lV9      
2015 06  20.34029  13 36 33.494  -06 36 10.28  24.9r 15GB55    568  C~2lV9      
2015 06  22.34439  13 36 30.711  -06 35 57.58  24.9r 15GB55    568  C~2lV9      
2015 07  14.29673  13 36 21.301  -06 35 48.17  24.8r 15GB55    568  C~2lV9      
2015 07  20.28959  13 36 25.636  -06 36 26.76  24.6r 15GB55    568  C~2lV9      
2016 02  04.53833  13 48 58.584  -07 38 18.55  24.9w 15GB55    568  C~2lV9      
2016 02  04.59350  13 48 58.554  -07 38 18.01  25.1w 15GB55    568  C~2lV9      
2016 02  04.60621  13 48 58.546  -07 38 17.68  25.1w 15GB55    568  C~2lV9      
2016 02  04.65482  13 48 58.510  -07 38 17.34  25.0w 15GB55    568  C~2lV9      
2016 02  11.58929  13 48 53.125  -07 36 55.67  24.8w 15GB55    568  C~2lV9      
2016 03  11.51709  13 47 49.813  -07 27 46.28  24.7w 15GB55    568  C~2lV9      
2016 03  11.52342  13 47 49.779  -07 27 46.21  24.9w 15GB55    568  C~2lV9      
2016 03  11.58318  13 47 49.591  -07 27 44.65  25.8w 15GB55    568  C~2lV9      
2016 03  11.59678  13 47 49.545  -07 27 44.50  25.5w 15GB55    568  C~2lV9      
2016 03  12.61050  13 47 46.302  -07 27 20.11  25.2w 15GB55    568  C~2lV9      
2016 04  03.46957  13 46 24.791  -07 17 52.73  24.9w 15GB55    568  C~2lV9      
2016 04  13.45991  13 45 42.832  -07 13 20.12  25.4w 15GB55    568  C~2lV9      
2016 04  14.36209  13 45 38.968  -07 12 55.18  25.7w 15GB55    568  C~2lV9      
2016 05  02.34774  13 44 22.697  -07 05 03.18  24.9w 15GB55    568  C~2lV9      
2016 05  07.35110  13 44 02.366  -07 03 01.96  24.9w 15GB55    568  C~2lV9      
2016 05  29.34365  13 42 44.088  -06 55 35.54  25.0w 15GB55    568  C~2lV9      
2016 06  04.40605  13 42 26.863  -06 54 03.56  25.0w 15GB55    568  C~2lV9      
2017 02  27.64948  13 53 54.289  -07 47 28.24        15GB55    568  C~2lV9      
2017 03  30.51119  13 52 14.058  -07 35 08.99        15GB55    568  C~2lV9      

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     0.00       0.00     0.01
  2   0.0001     -1.18     0.07       0.13    -0.09
  3   0.0083    -94.93    -0.01      18.56    -0.11
  4   0.1449  -2855.19    -0.10     251.41    -0.01
  5   0.1500  -2982.73     0.09     256.90     0.13
  6   0.1502  -2987.07     0.02     256.95     0.04
  7   0.1502  -2987.44    -0.06     256.96     0.04
  8   0.1502  -2987.66     0.01     257.09     0.16
  9   0.1504  -2992.95    -0.11     257.16     0.05
 10   0.1667  -3403.41     0.05     271.83    -0.31
 11   0.1669  -3407.42     0.06     272.14    -0.12
 12   0.2457  -5255.29     0.04     306.32     0.00
 13   0.3359  -6605.87    -0.02     279.60     0.10
 14   0.3360  -6606.77     0.05     279.46     0.04
 15   0.3415  -6650.07    -0.07     276.29     0.12
 16   0.4016  -6784.33     0.01     234.29     0.09
 17   0.4180  -6710.07    -0.06     221.69    -0.04
 18   0.9635   5085.79     0.11     778.81     0.01
 19   0.9637   5085.18     0.11     779.15    -0.01
 20   0.9637   5084.95     0.03     779.42     0.18
 21   0.9639   5084.33    -0.05     779.55    -0.02
 22   0.9828   4980.40    -0.09     827.42    -0.02
 23   1.0620   3904.54     0.01    1005.75    -0.04
 24   1.0621   3904.04    -0.15    1005.64    -0.19
 25   1.0622   3900.87    -0.11    1006.10    -0.02
 26   1.0623   3900.18    -0.07    1005.99    -0.19
 27   1.0650   3846.40    -0.02    1011.60     0.04
 28   1.1249   2510.91    -0.09    1109.25    -0.03
 29   1.1522   1830.30     0.40    1140.88    -0.21
 30   1.1547   1767.68    -0.02    1143.62     0.03
 31   1.2040    538.72    -0.21    1178.33     0.12
 32   1.2176    212.73    -0.01    1183.13     0.09
 33   1.2779  -1035.32     0.00    1182.02     0.17
 34   1.2945  -1307.75     0.11    1175.81     0.00
 35   2.0289   9396.59     0.06    1822.95     0.02
 36   2.1134   7738.64    -0.03    1987.85    -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.

15GB55    quality flag:2

Type:       SCATNEAR     3:1EE  SCATNEAR

axisobj        61.561    61.684    61.438
ecceobj         0.407     0.409     0.405
incobj         10.820    10.820    10.820
qmin           35.815    35.889    36.075
qmax           91.725    91.346    89.569
amean          62.881    62.631    62.052
amin           61.484    61.547    61.298
amax           64.187    63.963    63.211
emean           0.413     0.416     0.404
emin            0.390     0.403     0.391
emax            0.430     0.429     0.418
imean          11.642    10.782    11.352
imin           10.486    10.573    10.548
imax           12.564    10.992    12.061
excite_mean     0.460     0.456     0.449
fracstop        1.000     1.000     1.000
cjmean          3.056     3.058     3.060

libcent 0      -180.0     180.0    -180.0
libamp  0      -180.0     166.7    -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       184.4     174.6     182.2
kozaiamp        180.0     179.9     179.9