Orbit Fit and Astrometric record for 17RZ137

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: 17RZ137   
# Created Sat Dec  4 02:14:01 2021
# Orbit generated from Bernstein formalism
# Fitting     11 observations of     11
# Arc:   4.14y
# First observation: 2017/09/14
#  Last observation: 2021/11/05
Preliminary a, adot, b, bdot, g, gdot:
   0.000067   0.030007   0.000001  -0.000767   0.027184   0.000000
# Chi-squared of fit:     4.23 DOF:     16 RMS:  0.11
# Min/Max residuals:    -0.20    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.825686E-05  3.027451E-02  4.086218E-07 -7.636800E-04  2.729142E-02  3.565580E-03
# Covariance matrix:
  5.0752E-13 -3.2477E-13 -8.9000E-15  9.6921E-15  2.4936E-13 -2.5032E-12
 -3.2477E-13  1.0741E-12  9.9384E-15 -3.0850E-14  4.1154E-13  9.0923E-12
 -8.9000E-15  9.9384E-15  2.5678E-13 -7.8565E-14 -7.8347E-15  9.8899E-14
  9.6921E-15 -3.0850E-14 -7.8565E-14  5.1205E-14 -8.2875E-15 -2.7767E-13
  2.4936E-13  4.1154E-13 -7.8347E-15 -8.2875E-15  7.9899E-13  3.0848E-12
 -2.5032E-12  9.0923E-12  9.8899E-14 -2.7767E-13  3.0848E-12  8.1256E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
  -17.215904   19.498934    0.467727   -0.263933   -0.852342  2458010.878281
# Heliocentric elements and errors
Epoch:              2458010.5000  =  2017/09/14
Mean Anomaly:           23.91889 +/-     0.041
Argument of Peri:      227.93813 +/-     0.072
Long of Asc Node:      114.59840 +/-     0.002
Inclination:            16.89589 +/-     0.000
Eccentricity:         0.20820949 +/-    0.0003
Semi-Major Axis:     45.75595198 +/-    0.0092
Time of Perihelion: 2450499.3158 +/-      12.8
Perihelion:          36.22912851 +/-    0.0138
Aphelion:            55.28277546 +/-    0.0161
Period (y)              309.5135 +/-      0.09
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           33.98716587 +/-    0.0011
Ecliptic Y           11.53459801 +/-    0.0004
Ecliptic Z          -10.84493326 +/-    0.0004
Ecliptic XDOT        -0.00070811 +/-    0.0000
Ecliptic YDOT         0.00296376 +/-    0.0000
Ecliptic ZDOT        -0.00017916 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.49382579 +/-    0.0010
Geocenter to KBO     36.64155735 +/-    0.0012
# Hcoef:  7.69

The following table shows the complete astrometric record for 17RZ137. 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 (17RZ137) followed by the observatory code and reference code for the source of the astrometry.

2017 09  14.37748  01 37 58.913  -08 19 16.90  23.3i 17RZ137   W84  C~55dE      
2017 09  18.36643  01 37 42.740  -08 21 48.84  23.3r 17RZ137   W84  C~55dE      
2017 11  09.18873  01 33 33.731  -08 46 13.50  23.1i 17RZ137   W84  C~55dE      
2017 11  18.11684  01 32 54.520  -08 47 43.94  23.4r 17RZ137   W84  C~55dE      
2018 09  09.36428  01 44 48.752  -07 38 54.09  22.9z 17RZ137   W84  C~55dE      
2018 10  01.25192  01 43 18.291  -07 52 26.97  22.9i 17RZ137   W84  C~55dE      
2018 11  30.09981  01 38 40.273  -08 11 38.03  23.3r 17RZ137   W84  C~55dE      
2018 11  30.10118  01 38 40.263  -08 11 37.92  24.7g 17RZ137   W84  C~55dE      
2021 11  05.229900 01 59 41.998  -06 16 46.08  23.4G 17RZ137   G37  C~5BgM      
2021 11  05.284790 01 59 41.712  -06 16 47.06        17RZ137   G37  C~5BgM      
2021 11  05.340070 01 59 41.444  -06 16 48.17        17RZ137   G37  C~5BgM      

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    -0.15       0.00    -0.18
     2   0.0109   -279.70     0.10     -49.67     0.22
     3   0.1528  -4253.38    -0.08     -11.43    -0.20
     4   0.1772  -4826.26     0.13     123.42     0.23
     5   0.9856   6554.06     0.01     -78.73    -0.03
     6   1.0455   4999.70     0.06    -315.80    -0.07
     7   1.2094    742.11    -0.01     191.82    -0.06
     8   1.2094    742.02    -0.04     191.98     0.07
     9   4.1420  20792.54     0.07    -677.17    -0.03
    10   4.1421  20788.19    -0.08    -676.40     0.08
    11   4.1423  20784.03    -0.00    -675.86    -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.

17RZ137    quality flag:2

Type:       SCATNEAR  SCATEXTD  SCATNEAR

axisobj        46.361    46.394    46.329
ecceobj         0.217     0.218     0.217
incobj         16.898    16.898    16.898
qmin           35.204    35.499    35.530
qmax           57.185    57.061    57.019
amean          46.006    46.084    46.009
amin           45.555    45.679    45.594
amax           46.537    46.557    46.519
emean           0.213     0.210     0.210
emin            0.197     0.195     0.195
emax            0.232     0.227     0.226
imean          15.102    15.299    15.279
imin           14.316    14.752    14.689
imax           15.820    15.923    15.823
excite_mean     0.337     0.338     0.337
fracstop        1.000     1.000     1.000
cjmean          2.987     2.986     2.986

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       184.6     187.7     180.5
kozaiamp        180.0     180.0     179.9