Orbit Fit and Astrometric record for 15GS50

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: 15GS50    
# Created Thu Oct 19 01:38:34 2017
# Orbit generated from Bernstein formalism
# Fitting   16 observations of   16
# Arc:   0.91y
# First observation: 2015/04/13
#  Last observation: 2016/03/09
Preliminary a, adot, b, bdot, g, gdot:
  -0.000019   0.014283  -0.000000  -0.000086   0.018453   0.000000
# Chi-squared of fit:     8.72 DOF:   26 RMS:  0.13
# Min/Max residuals:    -0.35    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.274309E-05  1.429970E-02 -7.116156E-08 -8.663381E-05  1.859582E-02 -2.391010E-03
# Covariance matrix:
  1.8609E-13  9.1916E-13 -3.1573E-16  2.7991E-16  5.9937E-13  6.6856E-11
  9.1916E-13  5.2157E-11 -1.0843E-14  9.5726E-14  2.1232E-11  2.9662E-09
 -3.1573E-16 -1.0843E-14  1.2284E-13 -1.8307E-13 -4.8002E-15 -6.3567E-13
  2.7991E-16  9.5726E-14 -1.8307E-13  1.0907E-12  3.3413E-14  5.4320E-12
  5.9937E-13  2.1232E-11 -4.8002E-15  3.3413E-14  9.3320E-12  1.2434E-09
  6.6856E-11  2.9662E-09 -6.3567E-13  5.4320E-12  1.2434E-09  1.7249E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.711458 -135.029388    0.377150   -0.027503   -0.925468  2457125.681508
# Heliocentric elements and errors
Epoch:              2457120.5000  =  2015/04/08
Mean Anomaly:          236.22930 +/-     5.040
Argument of Peri:       40.60404 +/-     4.571
Long of Asc Node:      326.21496 +/-     0.138
Inclination:             1.71771 +/-     0.001
Eccentricity:         0.22887584 +/-    0.0151
Semi-Major Axis:     47.28268964 +/-    0.3099
Time of Perihelion: 2497949.3388 +/-    1613.5
Perihelion:          36.46082433 +/-    0.7550
Aphelion:            58.10455496 +/-    0.8111
Period (y)              325.1333 +/-      3.20
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -38.95186510 +/-    0.0063
Ecliptic Y          -38.37630868 +/-    0.0062
Ecliptic Z           -1.60607344 +/-    0.0003
Ecliptic XDOT         0.00173395 +/-    0.0000
Ecliptic YDOT        -0.00124645 +/-    0.0000
Ecliptic ZDOT        -0.00000215 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   54.70437217 +/-    0.0062
Geocenter to KBO     53.77551967 +/-    0.0088
# Hcoef:  6.73

The following table shows the complete astrometric record for 15GS50. 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 (15GS50) followed by the observatory code and reference code for the source of the astrometry.

2015 04  13.18073  14 47 54.967  -17 57 46.82  24. r 15GS50    807  C~1x8u      
2015 04  13.18074  14 47 54.97   -17 57 47.2         15GS50    W84  C~2JAh      
2015 04  13.33132  14 47 54.442  -17 57 44.69        15GS50    807  C~1x8u      
2015 04  13.33132  14 47 54.43   -17 57 44.9   24.3V 15GS50    W84  C~2JAh      
2015 04  13.38114  14 47 54.262  -17 57 43.72        15GS50    807  C~1x8u      
2015 04  13.38114  14 47 54.25   -17 57 44.1         15GS50    W84  C~2JAh      
2015 04  18.29584  14 47 36.575  -17 56 29.49        15GS50    304  C~1x8u      
2015 04  18.35570  14 47 36.352  -17 56 28.70  23.7r 15GS50    304  C~1x8u      
2015 04  19.31715  14 47 32.838  -17 56 13.59        15GS50    304  C~1x8u      
2015 05  22.10856  14 45 28.789  -17 47 04.39        15GS50    304  C~1x8u      
2015 05  22.17430  14 45 28.544  -17 47 03.27        15GS50    304  C~1x8u      
2015 05  23.09675  14 45 25.182  -17 46 47.74        15GS50    304  C~1x8u      
2015 07  20.13264  14 43 07.522  -17 35 12.82        15GS50    304  C~1x8u      
2015 07  21.01743  14 43 06.971  -17 35 08.61        15GS50    304  C~1x8u      
2016 03  08.37081  14 52 49.688  -18 18 43.07        15GS50    304  C~1x8u      
2016 03  09.37071  14 52 47.874  -18 18 37.10        15GS50    304  C~1x8u      

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    -0.12       0.00    -0.00
  2   0.0000      0.15     0.03      -0.35    -0.35
  3   0.0004     -7.89     0.01      -0.43    -0.27
  4   0.0004     -7.79     0.11      -0.18    -0.02
  5   0.0005    -10.58    -0.03      -0.43    -0.22
  6   0.0005    -10.53     0.03      -0.01     0.19
  7   0.0140   -273.58    -0.08      -3.83     0.03
  8   0.0142   -276.85    -0.05      -4.02    -0.11
  9   0.0168   -329.22     0.08      -4.44     0.08
 10   0.1066  -2183.56     0.06      -7.26     0.13
 11   0.1068  -2187.23     0.04      -7.23     0.14
 12   0.1093  -2237.70    -0.08      -6.77     0.15
 13   0.2682  -4323.47     0.04      64.91     0.19
 14   0.2706  -4332.26    -0.04      66.54     0.26
 15   0.9040   4385.51     0.01      28.26    -0.06
 16   0.9067   4359.05    -0.01      26.49    -0.12

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.

15GS50    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        46.959    48.080    46.325
ecceobj         0.238     0.285     0.201
incobj          1.720     1.720     1.720
qmin           34.518    33.482    36.520
qmax           60.857    64.051    57.271
amean          47.298    47.662    46.657
amin           46.824    46.786    46.231
amax           48.063    49.050    47.189
emean           0.241     0.267     0.198
emin            0.208     0.229     0.183
emax            0.270     0.307     0.215
imean           4.942     5.803     2.907
imin            2.986     0.607     2.016
imax            7.236     9.214     3.880
excite_mean     0.257     0.289     0.205
fracstop        1.000     1.000     1.000
cjmean          3.059     3.041     3.082

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       179.3     175.3     182.0
kozaiamp        180.0     179.9     180.0