Orbit Fit and Astrometric record for 17RY137

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: 17RY137   
# Created Fri Dec  3 02:13:58 2021
# Orbit generated from Bernstein formalism
# Fitting      9 observations of      9
# Arc:   3.16y
# First observation: 2015/09/11
#  Last observation: 2018/11/09
Preliminary a, adot, b, bdot, g, gdot:
   0.000169   0.025968   0.000018   0.001034   0.024993   0.000000
# Chi-squared of fit:    10.78 DOF:     12 RMS:  0.19
# Min/Max residuals:    -0.39    0.40
# Exact a, adot, b, bdot, g, gdot:
  1.584234E-05  2.611962E-02 -2.589915E-07  1.047093E-03  2.514312E-02 -3.480927E-03
# Covariance matrix:
  6.7899E-13 -6.9841E-13  2.9685E-14 -3.8217E-14 -3.6481E-13 -5.9986E-12
 -6.9841E-13  1.5526E-12 -1.9564E-14 -2.7132E-14  1.9728E-12  1.6881E-11
  2.9685E-14 -1.9564E-14  5.5739E-13 -3.2414E-13  7.1066E-13 -7.4381E-13
 -3.8217E-14 -2.7132E-14 -3.2414E-13  3.6565E-13 -1.5630E-12  7.3456E-13
 -3.6481E-13  1.9728E-12  7.1066E-13 -1.5630E-12  1.2725E-11  1.6527E-11
 -5.9986E-12  1.6881E-11 -7.4381E-13  7.3456E-13  1.6527E-11  2.0542E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -33.644424  -64.432840   -0.799402   -0.342136   -0.514376  2457276.553939
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          323.55539 +/-     0.108
Argument of Peri:      324.28790 +/-     0.159
Long of Asc Node:       21.16593 +/-     0.002
Inclination:            33.28375 +/-     0.000
Eccentricity:         0.16215739 +/-    0.0006
Semi-Major Axis:     45.74392169 +/-    0.0316
Time of Perihelion: 2468710.5875 +/-      31.9
Perihelion:          38.32620664 +/-    0.0385
Aphelion:            53.16163673 +/-    0.0461
Period (y)              309.3914 +/-      0.32
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           15.27401872 +/-    0.0020
Ecliptic Y          -30.08064762 +/-    0.0042
Ecliptic Z          -22.03535208 +/-    0.0031
Ecliptic XDOT         0.00245492 +/-    0.0000
Ecliptic YDOT         0.00144870 +/-    0.0000
Ecliptic ZDOT         0.00030497 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.29513309 +/-    0.0037
Geocenter to KBO     39.77231506 +/-    0.0056
# Hcoef:  7.69

The following table shows the complete astrometric record for 17RY137. 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 (17RY137) followed by the observatory code and reference code for the source of the astrometry.

2015 09  11.05315  20 29 54.293  -53 48 27.70  23.3i 17RY137   W84  C~55dE      
2015 09  11.05452  20 29 54.278  -53 48 28.29  24.3r 17RY137   W84  C~55dE      
2016 09  22.03290  20 38 25.056  -53 11 30.81  23.9r 17RY137   W84  C~55dE      
2016 09  22.03427  20 38 25.056  -53 11 30.24  24.0g 17RY137   W84  C~55dE      
2017 09  14.06667  20 48 22.322  -52 41 46.86  24.1r 17RY137   W84  C~55dE      
2017 09  18.05930  20 48 01.392  -52 39 56.72  23.4g 17RY137   W84  C~55dE      
2017 09  27.03065  20 47 21.557  -52 35 01.25  23.2r 17RY137   W84  C~55dE      
2018 11  07.02800  20 55 40.243  -51 26 01.67  24.4r 17RY137   W84  C~55dE      
2018 11  09.04729  20 55 44.616  -51 24 04.78  24.4g 17RY137   W84  C~55dE      

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     0.19
     2   0.0000     -0.30    -0.12      -0.53    -0.39
     3   1.0321   5016.98    -0.08     721.33    -0.08
     4   1.0321   5017.16     0.13     721.87     0.40
     5   2.0096  10709.49     0.08     590.27    -0.05
     6   2.0206  10569.62     0.05     760.47     0.09
     7   2.0451  10332.53    -0.23    1164.60    -0.08
     8   3.1567  16147.79     0.04    3364.49    -0.34
     9   3.1622  16230.13     0.01    3457.87     0.26

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.

17RY137    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        45.797    45.884    45.709
ecceobj         0.166     0.167     0.165
incobj         33.309    33.310    33.309
qmin           37.324    37.415    37.281
qmax           54.957    54.920    54.751
amean          45.929    46.008    45.835
amin           45.535    45.627    45.459
amax           46.370    46.441    46.259
emean           0.169     0.168     0.168
emin            0.153     0.155     0.152
emax            0.185     0.183     0.185
imean          33.046    33.078    33.032
imin           32.811    32.826    32.794
imax           33.370    33.358    33.368
excite_mean     0.571     0.571     0.570
fracstop        1.000     1.000     1.000
cjmean          2.697     2.697     2.696

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       166.9     164.7     168.6
kozaiamp        180.0     180.0     180.0