Orbit Fit and Astrometric record for 15GA56

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: 15GA56    
# Created Wed Feb 20 02:10:31 2019
# Orbit generated from Bernstein formalism
# Fitting   35 observations of   35
# Arc:   2.34y
# First observation: 2015/02/17
#  Last observation: 2017/06/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.000038   0.015664  -0.000001   0.003989   0.019458   0.000000
# Chi-squared of fit:     7.42 DOF:   64 RMS:  0.08
# Min/Max residuals:    -0.22    0.19
# Exact a, adot, b, bdot, g, gdot:
  1.255860E-05  1.561933E-02  2.782216E-06  3.955160E-03  1.944120E-02 -4.915075E-03
# Covariance matrix:
  2.2383E-13  7.7546E-15 -1.6947E-14  7.5927E-14  2.2791E-13  1.1009E-11
  7.7546E-15  1.8118E-13 -1.2884E-14  5.8358E-14  1.5960E-13  8.4741E-12
 -1.6947E-14 -1.2884E-14  9.9132E-14 -9.8245E-14 -3.4323E-14 -2.6142E-12
  7.5927E-14  5.8358E-14 -9.8245E-14  2.0404E-13  1.5591E-13  1.2293E-11
  2.2791E-13  1.5960E-13 -3.4323E-14  1.5591E-13  4.1564E-13  2.2648E-11
  1.1009E-11  8.4741E-12 -2.6142E-12  1.2293E-11  2.2648E-11  1.7939E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.466671 -157.474893    0.799453    0.024927   -0.575373  2457071.068908
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          285.67251 +/-     0.364
Argument of Peri:      119.10984 +/-     0.144
Long of Asc Node:      192.15023 +/-     0.001
Inclination:            14.48245 +/-     0.001
Eccentricity:         0.30371465 +/-    0.0023
Semi-Major Axis:     51.55138671 +/-    0.0777
Time of Perihelion: 2484983.4609 +/-     121.3
Perihelion:          35.89447524 +/-    0.1282
Aphelion:            67.20829819 +/-    0.1541
Period (y)              370.1423 +/-      0.84
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -48.31007911 +/-    0.0016
Ecliptic Y          -19.16886382 +/-    0.0006
Ecliptic Z            2.21390707 +/-    0.0001
Ecliptic XDOT         0.00149992 +/-    0.0000
Ecliptic YDOT        -0.00176329 +/-    0.0000
Ecliptic ZDOT         0.00052678 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   52.02125016 +/-    0.0015
Geocenter to KBO     51.43714444 +/-    0.0017
# Hcoef:  7.46

The following table shows the complete astrometric record for 15GA56. 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 (15GA56) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.56813  13 27 01.136  -06 28 27.11  24.5r 15GA56    568  C~2lVD      
2015 02  17.60905  13 27 01.049  -06 28 26.53  24.4r 15GA56    568  C~2lVD      
2015 02  20.60184  13 26 55.261  -06 27 37.15  24.6r 15GA56    568  C~2lVD      
2015 03  18.54653  13 25 44.951  -06 18 44.40  24.4r 15GA56    568  C~2lVD      
2015 03  18.58746  13 25 44.805  -06 18 43.50  24.4r 15GA56    568  C~2lVD      
2015 03  20.55033  13 25 38.312  -06 17 57.34  24.5r 15GA56    568  C~2lVD      
2015 04  11.49722  13 24 19.788  -06 09 00.35  24.4r 15GA56    568  C~2lVD      
2015 04  13.36151  13 24 12.873  -06 08 14.43  24.4r 15GA56    568  C~2lVD      
2015 04  13.40245  13 24 12.714  -06 08 13.38  24.8r 15GA56    568  C~2lVD      
2015 04  13.48799  13 24 12.403  -06 08 11.64  24.1r 15GA56    568  C~2lVD      
2015 04  13.50003  13 24 12.344  -06 08 11.02  24.8r 15GA56    568  C~2lVD      
2015 04  13.50498  13 24 12.328  -06 08 10.91  24.4r 15GA56    568  C~2lVD      
2015 04  19.40228  13 23 50.498  -06 05 47.29  24.6r 15GA56    568  C~2lVD      
2015 05  18.27664  13 22 12.472  -05 55 23.28  24.4r 15GA56    568  C~2lVD      
2015 05  18.32493  13 22 12.326  -05 55 22.40  24.7r 15GA56    568  C~2lVD      
2015 06  20.27498  13 21 03.759  -05 48 33.19  24.6r 15GA56    568  C~2lVD      
2015 06  20.31583  13 21 03.704  -05 48 32.97  24.6r 15GA56    568  C~2lVD      
2015 06  22.31959  13 21 01.639  -05 48 21.71  25.1r 15GA56    568  C~2lVD      
2015 07  20.26475  13 21 01.793  -05 48 43.59  24.8r 15GA56    568  C~2lVD      
2016 02  04.54302  13 31 01.605  -06 38 40.65  24.8w 15GA56    568  C~2lVD      
2016 02  10.53099  13 30 55.108  -06 37 28.79  24.9w 15GA56    568  C~2lVD      
2016 03  11.52813  13 29 48.425  -06 28 24.91  24.8w 15GA56    568  C~2lVD      
2016 03  17.46439  13 29 29.801  -06 26 09.85  25.2w 15GA56    568  C~2lVD      
2016 04  03.41700  13 28 30.713  -06 19 20.08  24.6w 15GA56    568  C~2lVD      
2016 04  09.39673  13 28 08.597  -06 16 51.97  24.5w 15GA56    568  C~2lVD      
2016 05  01.35239  13 26 47.952  -06 08 09.31  23.9w 15GA56    568  C~2lVD      
2016 05  02.29500  13 26 44.647  -06 07 48.42  24.5w 15GA56    568  C~2lVD      
2016 05  06.30476  13 26 30.811  -06 06 21.75  24.3w 15GA56    568  C~2lVD      
2016 05  28.26791  13 25 25.284  -05 59 41.40  24.2w 15GA56    568  C~2lVD      
2016 05  28.27195  13 25 25.277  -05 59 41.39  24.1w 15GA56    568  C~2lVD      
2016 06  04.34936  13 25 08.961  -05 58 05.61  24.5w 15GA56    568  C~2lVD      
2016 06  04.35340  13 25 08.954  -05 58 05.46  24.6w 15GA56    568  C~2lVD      
2016 06  27.27271  13 24 36.954  -05 55 10.28  24.6w 15GA56    568  C~2lVD      
2016 07  06.30847  13 24 33.948  -05 55 01.70  24.8w 15GA56    568  C~2lVD      
2017 06  22.27110  13 28 23.860  -06 02 42.64  24.7w 15GA56    568  C~2lVD      

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     0.03       0.00     0.09
  2   0.0001     -1.42    -0.07       0.06    -0.03
  3   0.0083    -99.83    -0.01      14.04     0.06
  4   0.0793  -1270.70     0.04     121.05     0.02
  5   0.0795  -1273.06    -0.07     121.08    -0.08
  6   0.0848  -1380.08    -0.05     128.11    -0.01
  7   0.1449  -2666.76    -0.00     192.79     0.04
  8   0.1500  -2779.58    -0.04     197.17     0.03
  9   0.1501  -2782.18    -0.12     197.26     0.04
 10   0.1504  -2787.13     0.19     197.16    -0.22
 11   0.1504  -2788.18    -0.12     197.41     0.00
 12   0.1504  -2788.44    -0.08     197.42     0.01
 13   0.1666  -3144.15     0.18     209.95     0.00
 14   0.2456  -4734.21     0.07     246.00     0.03
 15   0.2457  -4736.57     0.06     246.01     0.03
 16   0.3360  -5839.21     0.07     245.10     0.04
 17   0.3361  -5840.06    -0.03     245.00    -0.03
 18   0.3416  -5872.87    -0.18     243.98    -0.01
 19   0.4181  -5862.59     0.08     224.52    -0.10
 20   0.9637   3557.41    -0.07     751.60     0.03
 21   0.9800   3440.92     0.16     782.80    -0.00
 22   1.0622   2316.53     0.18     922.51     0.02
 23   1.0784   2008.66    -0.09     945.74     0.08
 24   1.1248   1038.73    -0.08    1001.67    -0.00
 25   1.1412    677.60    -0.10    1017.57    -0.03
 26   1.2013   -633.02     0.01    1058.77     0.11
 27   1.2039   -686.55     0.05    1059.94     0.11
 28   1.2149   -910.33     0.07    1064.12    -0.10
 29   1.2750  -1966.60    -0.05    1074.14    -0.07
 30   1.2750  -1966.70     0.02    1074.11    -0.10
 31   1.2944  -2228.30     0.00    1072.89    -0.07
 32   1.2944  -2228.45    -0.01    1072.99     0.04
 33   1.3572  -2736.88     0.12    1058.71     0.13
 34   1.3819  -2781.72    -0.09    1050.04    -0.03
 35   2.3428    575.54    -0.06    1890.98    -0.03

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.

15GA56    quality flag:2

Type:       SCATNEAR  9:4EEEEE  SCATNEAR

axisobj        51.105    51.322    50.894
ecceobj         0.307     0.314     0.301
incobj         14.569    14.568    14.570
qmin           35.029    34.858    35.264
qmax           68.640    69.595    67.965
amean          51.458    51.700    51.216
amin           50.953    51.062    50.630
amax           52.103    52.489    51.930
emean           0.301     0.313     0.292
emin            0.285     0.299     0.277
emax            0.317     0.326     0.310
imean          15.081    14.721    15.204
imin           14.319    14.306    14.392
imax           15.774    15.119    15.834
excite_mean     0.398     0.403     0.393
fracstop        1.000     1.000     1.000
cjmean          2.992     2.989     2.995

libcent 0      -180.0     177.2    -180.0
libamp  0      -180.0     148.1    -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       186.6     181.6     183.5
kozaiamp        180.0     180.0     180.0