Orbit Fit and Astrometric record for 17FP161

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: 17FP161   
# Created Fri Feb 22 02:10:34 2019
# Orbit generated from Bernstein formalism
# Fitting   12 observations of   12
# Arc:   1.23y
# First observation: 2017/03/23
#  Last observation: 2018/06/14
Preliminary a, adot, b, bdot, g, gdot:
  -0.000013   0.015933   0.000001   0.000458   0.019414   0.000000
# Chi-squared of fit:     7.94 DOF:   18 RMS:  0.14
# Min/Max residuals:    -0.20    0.35
# Exact a, adot, b, bdot, g, gdot:
  1.296524E-05  1.591439E-02  5.107110E-07  4.561255E-04  1.941639E-02 -1.981237E-03
# Covariance matrix:
  7.2695E-13  6.7068E-13 -2.6791E-14  5.2933E-14  1.6677E-12  9.1469E-11
  6.7068E-13  2.4355E-12 -5.2810E-14  1.0021E-13  3.3654E-12  1.9462E-10
 -2.6791E-14 -5.2810E-14  2.6915E-13 -2.6598E-13 -9.7835E-14 -5.1107E-12
  5.2933E-14  1.0021E-13 -2.6598E-13  4.8236E-13  1.9478E-13  9.5287E-12
  1.6677E-12  3.3654E-12 -9.7835E-14  1.9478E-13  6.0620E-12  3.2889E-10
  9.1469E-11  1.9462E-10 -5.1107E-12  9.5287E-12  3.2889E-10  1.9422E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   15.375274 -152.273953    0.426159    0.238092   -0.865247  2457835.762831
# Heliocentric elements and errors
Epoch:              2457830.5000  =  2017/03/18
Mean Anomaly:          243.45631 +/-     2.063
Argument of Peri:      214.85160 +/-     1.882
Long of Asc Node:      123.84937 +/-     0.013
Inclination:            15.20932 +/-     0.000
Eccentricity:         0.15771076 +/-    0.0059
Semi-Major Axis:     48.12865601 +/-    0.0996
Time of Perihelion: 2497311.6952 +/-     688.1
Perihelion:          40.53824904 +/-    0.2951
Aphelion:            55.71906298 +/-    0.3055
Period (y)              333.8980 +/-      1.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -44.95325472 +/-    0.0056
Ecliptic Y          -23.14920715 +/-    0.0029
Ecliptic Z           13.65549627 +/-    0.0017
Ecliptic XDOT         0.00130103 +/-    0.0000
Ecliptic YDOT        -0.00185972 +/-    0.0000
Ecliptic ZDOT        -0.00001213 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   52.37512272 +/-    0.0050
Geocenter to KBO     51.50289254 +/-    0.0065
# Hcoef:  7.17

The following table shows the complete astrometric record for 17FP161. 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 (17FP161) followed by the observatory code and reference code for the source of the astrometry.

2017 03  23.26203  14 04 49.699  +03 42 59.68  24.3r 17FP161   807  C~2b81      
2017 03  23.32312  14 04 49.516  +03 43 01.64  24.2r 17FP161   807  C~2b81      
2017 04  20.20703  14 03 11.584  +03 54 15.86        17FP161   G37  C~2b81      
2017 04  20.28797  14 03 11.271  +03 54 17.62        17FP161   G37  C~2b81      
2017 04  24.29268  14 02 56.296  +03 55 38.61        17FP161   304  C~2b81      
2017 04  25.28043  14 02 52.598  +03 55 57.86        17FP161   304  C~2b81      
2018 03  11.36629  14 08 52.408  +03 19 38.64  24.2r 17FP161   304  C~2b81      
2018 03  11.40495  14 08 52.305  +03 19 39.69        17FP161   304  C~2b81      
2018 03  12.36674  14 08 49.873  +03 20 05.19        17FP161   304  C~2b81      
2018 03  12.39202  14 08 49.819  +03 20 05.83        17FP161   304  C~2b81      
2018 06  14.18710  14 03 42.433  +03 45 19.22  24.0R 17FP161   G37  C~2kSp      
2018 06  14.27693  14 03 42.208  +03 45 19.21        17FP161   G37  C~2kSp      

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    -0.03
  2   0.0002     -3.25     0.04       0.87     0.35
  3   0.0765  -1612.61     0.03     114.92    -0.20
  4   0.0767  -1617.62    -0.08     114.92    -0.17
  5   0.0877  -1855.90     0.06     111.75    -0.08
  6   0.0904  -1914.48    -0.05     110.27     0.04
  7   0.9667   3894.86    -0.14     -26.62     0.11
  8   0.9669   3893.05    -0.20     -26.18     0.11
  9   0.9695   3849.95     0.07     -15.22     0.03
 10   0.9696   3848.96     0.26     -14.91     0.06
 11   1.2264   -991.37     0.21    -224.54    -0.17
 12   1.2266   -994.51    -0.20    -225.74    -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.

17FP161    quality flag:2

Type:       SCATNEAR  SCATNEAR      2:1E

axisobj        47.554    47.835    47.321
ecceobj         0.166     0.182     0.151
incobj         15.213    15.213    15.214
qmin           38.794    38.314    38.829
qmax           57.278    58.506    57.503
amean          47.799    48.146    47.796
amin           47.318    47.643    47.258
amax           48.319    48.682    48.419
emean           0.102     0.183     0.144
emin            0.002     0.166     0.095
emax            0.186     0.202     0.188
imean          15.203    13.699    14.036
imin           13.147    13.137    12.962
imax           16.336    14.324    15.212
excite_mean     0.285     0.299     0.283
fracstop        1.000     1.000     1.000
cjmean          3.047     3.041     3.049

libcent 0      -180.0    -180.0     180.1
libamp  0      -180.0    -180.0     170.3
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       143.6     182.4     177.2
kozaiamp        159.0     180.0     179.9