Orbit Fit and Astrometric record for 15GR55

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: 15GR55    
# Created Thu Feb 21 02:10:16 2019
# Orbit generated from Bernstein formalism
# Fitting   32 observations of   32
# Arc:   2.27y
# First observation: 2015/03/18
#  Last observation: 2017/06/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.000064   0.022532  -0.000001   0.009780   0.025213   0.000000
# Chi-squared of fit:     7.53 DOF:   58 RMS:  0.09
# Min/Max residuals:    -0.21    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.422844E-05  2.269419E-02  6.006610E-06  9.865056E-03  2.553241E-02  2.487424E-03
# Covariance matrix:
  1.5626E-13 -5.8264E-14 -3.1012E-15  1.5547E-14  8.7757E-14  8.1953E-13
 -5.8264E-14  3.0098E-13 -2.8949E-14  1.2719E-13  1.6393E-13  6.8013E-12
 -3.1012E-15 -2.8949E-14  1.1678E-13 -1.0151E-13 -2.3249E-14 -9.9971E-13
  1.5547E-14  1.2719E-13 -1.0151E-13  1.8609E-13  1.0533E-13  4.3911E-12
  8.7757E-14  1.6393E-13 -2.3249E-14  1.0533E-13  2.4784E-13  5.6126E-12
  8.1953E-13  6.8013E-12 -9.9971E-13  4.3911E-12  5.6126E-12  2.3481E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.815677 -156.039180    0.443056    0.028248   -0.887298  2457100.063688
# Heliocentric elements and errors
Epoch:              2457100.5000  =  2015/03/19
Mean Anomaly:          105.30867 +/-     0.170
Argument of Peri:      248.74559 +/-     0.158
Long of Asc Node:      199.24107 +/-     0.000
Inclination:            23.52151 +/-     0.001
Eccentricity:         0.09766835 +/-    0.0005
Semi-Major Axis:     38.73070675 +/-    0.0045
Time of Perihelion: 2431346.5892 +/-      41.3
Perihelion:          34.94794255 +/-    0.0208
Aphelion:            42.51347094 +/-    0.0210
Period (y)              241.0412 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -36.76681661 +/-    0.0007
Ecliptic Y          -15.85347362 +/-    0.0003
Ecliptic Z            1.24120109 +/-    0.0000
Ecliptic XDOT         0.00077187 +/-    0.0000
Ecliptic YDOT        -0.00232422 +/-    0.0000
Ecliptic ZDOT         0.00106584 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.05835755 +/-    0.0007
Geocenter to KBO     39.16590419 +/-    0.0008
# Hcoef:  8.94

The following table shows the complete astrometric record for 15GR55. 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 (15GR55) followed by the observatory code and reference code for the source of the astrometry.

2015 03  18.56291  13 31 25.728  -07 36 28.05  24.0r 15GR55    568  C~2lVC      
2015 03  18.60407  13 31 25.560  -07 36 26.77  24.6r 15GR55    568  C~2lVC      
2015 03  20.56704  13 31 17.447  -07 35 24.72  24.8r 15GR55    568  C~2lVC      
2015 04  11.50134  13 29 38.553  -07 23 15.21  24.6r 15GR55    568  C~2lVC      
2015 04  13.36562  13 29 29.786  -07 22 12.17  24.3r 15GR55    568  C~2lVC      
2015 04  13.40656  13 29 29.576  -07 22 10.67  24.9r 15GR55    568  C~2lVC      
2015 04  13.50913  13 29 29.085  -07 22 07.26  24.8r 15GR55    568  C~2lVC      
2015 04  19.40635  13 29 01.293  -07 18 48.63  24.7r 15GR55    568  C~2lVC      
2015 05  18.32905  13 26 55.866  -07 04 03.76  24.4r 15GR55    568  C~2lVC      
2015 06  20.27906  13 25 28.324  -06 53 27.15  25.0r 15GR55    568  C~2lVC      
2015 06  20.31989  13 25 28.269  -06 53 26.85  25.0r 15GR55    568  C~2lVC      
2015 06  22.32371  13 25 25.670  -06 53 05.65  25.2r 15GR55    568  C~2lVC      
2015 07  14.27603  13 25 20.681  -06 51 34.74  24.5r 15GR55    568  C~2lVC      
2015 07  20.26893  13 25 26.936  -06 51 55.90  24.6r 15GR55    568  C~2lVC      
2016 02  04.56733  13 38 57.226  -07 50 09.36  25.2w 15GR55    568  C~2lVC      
2016 02  10.55526  13 38 50.712  -07 48 35.06  25.7w 15GR55    568  C~2lVC      
2016 02  10.60492  13 38 50.652  -07 48 34.39  27.3w 15GR55    568  C~2lVC      
2016 02  11.57713  13 38 49.258  -07 48 17.27  25.2w 15GR55    568  C~2lVC      
2016 04  03.43722  13 35 56.509  -07 24 27.40  24.8w 15GR55    568  C~2lVC      
2016 04  09.41701  13 35 28.737  -07 21 06.59  25.0w 15GR55    568  C~2lVC      
2016 05  02.32746  13 33 42.269  -07 08 38.47  24.8w 15GR55    568  C~2lVC      
2016 05  06.33724  13 33 24.628  -07 06 36.96  25.1w 15GR55    568  C~2lVC      
2016 05  28.29624  13 32 00.668  -06 57 02.44  24.7w 15GR55    568  C~2lVC      
2016 05  28.30839  13 32 00.631  -06 57 02.19  25.1w 15GR55    568  C~2lVC      
2016 05  29.31531  13 31 57.436  -06 56 40.22  24.9w 15GR55    568  C~2lVC      
2016 06  04.37369  13 31 39.658  -06 54 38.41  25.3w 15GR55    568  C~2lVC      
2016 06  27.34232  13 30 58.180  -06 49 41.39  25.6w 15GR55    568  C~2lVC      
2016 07  07.33209  13 30 54.251  -06 48 59.30  25.0w 15GR55    568  C~2lVC      
2017 02  27.63752  13 43 52.268  -07 38 54.53        15GR55    568  C~2lVC      
2017 03  28.58374  13 42 06.159  -07 24 38.61        15GR55    568  C~2lVC      
2017 03  29.47339  13 42 02.238  -07 24 09.64  25.0w 15GR55    568  C~2lVC      
2017 06  24.29923  13 36 38.646  -06 47 17.01  24.8w 15GR55    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    -0.04       0.00     0.02
  2   0.0001     -2.79     0.02       0.27     0.03
  3   0.0055   -137.77    -0.15      13.76     0.05
  4   0.0655  -1773.71    -0.01     152.18     0.09
  5   0.0706  -1918.18     0.15     162.85     0.01
  6   0.0708  -1921.64    -0.08     163.10     0.04
  7   0.0710  -1929.68    -0.03     163.58    -0.01
  8   0.0872  -2387.27    -0.14     196.18    -0.03
  9   0.1664  -4449.19     0.04     330.92    -0.06
 10   0.2566  -5896.49    -0.02     441.07     0.12
 11   0.2567  -5897.36     0.11     441.04    -0.00
 12   0.2622  -5941.19     0.03     446.43    -0.21
 13   0.3223  -6043.93    -0.07     503.45    -0.05
 14   0.3387  -5949.48     0.07     518.24    -0.04
 15   0.8843   6550.73    -0.09    1683.26     0.01
 16   0.9007   6426.20     0.04    1736.05     0.14
 17   0.9009   6425.13     0.27    1736.35     0.03
 18   0.9035   6399.59    -0.00    1744.79    -0.02
 19   1.0455   3485.28    -0.04    2142.99     0.02
 20   1.0619   3027.24    -0.06    2179.39    -0.00
 21   1.1246   1278.92    -0.04    2297.44     0.02
 22   1.1356    990.08     0.09    2314.53    -0.03
 23   1.1957   -383.50    -0.04    2391.62    -0.07
 24   1.1957   -384.11     0.01    2391.65    -0.07
 25   1.1985   -436.43    -0.01    2394.66     0.04
 26   1.2151   -727.40    -0.02    2410.97    -0.12
 27   1.2780  -1411.06     0.18    2460.75    -0.15
 28   1.3053  -1480.95    -0.02    2478.44     0.13
 29   1.9496  10403.56     0.05    3900.38     0.04
 30   2.0288   8619.15     0.08    4129.37     0.11
 31   2.0312   8554.18    -0.13    4135.31    -0.11
 32   2.2690   3257.32    -0.13    4449.52     0.05

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.

15GR55    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        38.430    38.444    38.417
ecceobj         0.100     0.101     0.098
incobj         23.628    23.628    23.628
qmin           34.018    33.983    34.189
qmax           43.496    43.534    43.383
amean          38.653    38.653    38.654
amin           38.359    38.346    38.339
amax           38.984    38.995    38.997
emean           0.101     0.102     0.096
emin            0.084     0.086     0.081
emax            0.118     0.118     0.113
imean          24.277    24.272    24.332
imin           23.465    23.452    23.525
imax           25.052    25.037    25.066
excite_mean     0.423     0.424     0.423
fracstop        1.000     1.000     1.000
cjmean          2.833     2.833     2.834

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       190.6     192.8     176.4
kozaiamp        180.0     180.0     180.0