Orbit Fit and Astrometric record for 18RR2

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: 18RR2     
# Created Mon Apr 22 01:10:19 2019
# Orbit generated from Bernstein formalism
# Fitting   28 observations of   28
# Arc:  83.77d
# First observation: 2018/08/11
#  Last observation: 2018/11/03
Preliminary a, adot, b, bdot, g, gdot:
  -0.000780   0.300805   0.000303   0.258503   0.140077   0.000000
# Chi-squared of fit:   188.42 DOF:   50 RMS:  0.46
# Min/Max residuals:    -1.02    1.74
# Exact a, adot, b, bdot, g, gdot:
  3.412781E-05  3.100802E-01  2.818074E-05  2.583317E-01  1.416430E-01 -3.568535E-02
# Covariance matrix:
  2.1198E-13 -2.0913E-13 -3.1510E-14  1.1230E-12  4.9985E-13  1.8715E-11
 -2.0913E-13  4.2589E-09  1.4778E-11 -7.0878E-11  7.2742E-10 -5.0590E-10
 -3.1510E-14  1.4778E-11  2.0911E-13 -1.6784E-12  2.3446E-12 -1.0797E-11
  1.1230E-12 -7.0878E-11 -1.6784E-12  2.8109E-11 -5.9480E-12  3.1113E-10
  4.9985E-13  7.2742E-10  2.3446E-12 -5.9480E-12  1.2659E-10  1.5867E-11
  1.8715E-11 -5.0590E-10 -1.0797E-11  3.1113E-10  1.5867E-11  5.0761E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -9.046553   -3.658048    0.613505   -0.125934   -0.791258  2458342.062644
# Heliocentric elements and errors
Epoch:              2458340.5000  =  2018/08/10
Mean Anomaly:          356.52888 +/-     0.004
Argument of Peri:        7.60720 +/-     0.024
Long of Asc Node:        1.46439 +/-     0.002
Inclination:            40.23068 +/-     0.006
Eccentricity:         0.64057898 +/-    0.0001
Semi-Major Axis:     21.38864098 +/-    0.0048
Time of Perihelion: 2458688.8696 +/-       0.4
Perihelion:           7.68752723 +/-    0.0028
Aphelion:            35.08975472 +/-    0.0082
Period (y)               98.9197 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            7.71813661 +/-    0.0006
Ecliptic Y           -1.11503722 +/-    0.0000
Ecliptic Z           -1.10985917 +/-    0.0001
Ecliptic XDOT         0.00049352 +/-    0.0000
Ecliptic YDOT         0.00597155 +/-    0.0000
Ecliptic ZDOT         0.00503951 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO    7.87684760 +/-    0.0005
Geocenter to KBO      7.06000105 +/-    0.0006
# Hcoef: 12.01

The following table shows the complete astrometric record for 18RR2. 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 (18RR2) followed by the observatory code and reference code for the source of the astrometry.

2018 08  11.561843 00 01 06.087  -09 44 54.91  20.8G 18RR2     F51  C~2kTi      
2018 08  11.573552 00 01 05.889  -09 44 54.94  20.9G 18RR2     F51  C~2kTi      
2018 08  11.585218 00 01 05.693  -09 44 54.93  20.7G 18RR2     F51  C~2kTi      
2018 08  14.566539 00 00 15.271  -09 44 54.20  20.9G 18RR2     F51  C~2kTi      
2018 08  14.577987 00 00 15.059  -09 44 54.24  20.9G 18RR2     F51  C~2kTi      
2018 08  14.589440 00 00 14.865  -09 44 54.32  20.6G 18RR2     F51  C~2kTi      
2018 08  14.600906 00 00 14.648  -09 44 54.23  21.0G 18RR2     F51  C~2kTi      
2018 09  08.67036  23 51 19.78   -09 47 20.2   20.8R 18RR2     D29  C~2kTi      
2018 09  08.68716  23 51 19.40   -09 47 20.4   21.0R 18RR2     D29  C~2kTi      
2018 09  08.70395  23 51 18.95   -09 47 20.2   20.8R 18RR2     D29  C~2kTi      
2018 09  09.35511  23 51 03.16   -09 47 22.8   20.6G 18RR2     I52  C~2kTi      
2018 09  09.36406  23 51 02.96   -09 47 22.7   21.0G 18RR2     I52  C~2kTi      
2018 09  09.37203  23 51 02.74   -09 47 22.8   20.9G 18RR2     I52  C~2kTi      
2018 09  09.38162  23 51 02.52   -09 47 22.6   21.0G 18RR2     I52  C~2kTi      
2018 09  14.23324  23 49 03.53   -09 47 29.0   20.8G 18RR2     G96  C~2kTi      
2018 09  14.24444  23 49 03.23   -09 47 28.3   20.6G 18RR2     G96  C~2kTj      
2018 09  14.25011  23 49 03.09   -09 47 28.7   21.0G 18RR2     G96  C~2kTj      
2018 09  14.25579  23 49 02.97   -09 47 28.5   20.8G 18RR2     G96  C~2kTj      
2018 10  03.34613  23 41 13.329  -09 42 42.67  20.7w 18RR2     F52  C~2lWj      
2018 10  03.35782  23 41 13.045  -09 42 42.27  20.7w 18RR2     F52  C~2lWj      
2018 10  03.36957  23 41 12.754  -09 42 42.05  20.7w 18RR2     F52  C~2lWj      
2018 10  03.38126  23 41 12.469  -09 42 41.47  20.7w 18RR2     F52  C~2lWj      
2018 10  30.99024  23 32 01.92   -09 12 34.4   20.7R 18RR2     W49  C~2ogO      
2018 10  31.02921  23 32 01.46   -09 12 30.5   20.1R 18RR2     W49  C~2ogO      
2018 10  31.06833  23 32 00.89   -09 12 25.4   19.9R 18RR2     W49  C~2ogO      
2018 11  03.30145  23 31 14.736  -09 06 43.00  20.9w 18RR2     F52  C~2ogO      
2018 11  03.31422  23 31 14.571  -09 06 41.98  21.0w 18RR2     F52  C~2ogO      
2018 11  03.32697  23 31 14.375  -09 06 40.23  21.5w 18RR2     F52  C~2ogO      

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     0.10       0.00     0.14
  2   0.0000     -2.69     0.06       1.15     0.09
  3   0.0001     -5.34     0.06       2.33     0.08
  4   0.0082   -687.41     0.07     303.02     0.07
  5   0.0083   -690.30    -0.03     304.24     0.08
  6   0.0083   -692.96     0.11     305.32    -0.06
  7   0.0083   -695.86    -0.00     306.70     0.10
  8   0.0770  -8008.25    -0.14    3331.01    -0.02
  9   0.0770  -8013.50     0.27    3333.06    -0.34
 10   0.0770  -8019.54    -0.11    3335.88     0.12
 11   0.0788  -8235.28    -0.24    3426.10    -0.11
 12   0.0789  -8237.96     0.10    3427.36    -0.11
 13   0.0789  -8240.99    -0.24    3428.56    -0.05
 14   0.0789  -8243.90     0.08    3430.03     0.06
 15   0.0922  -9865.72    -0.19    4120.94    -0.39
 16   0.0922  -9869.53    -0.16    4123.34     0.36
 17   0.0922  -9871.60    -0.29    4123.79    -0.03
 18   0.0922  -9873.15     0.10    4124.68     0.02
 19   0.1445 -16178.93     0.13    7122.75    -0.21
 20   0.1445 -16182.67     0.13    7124.77    -0.18
 21   0.1446 -16186.57    -0.02    7126.66    -0.28
 22   0.1446 -16190.26     0.03    7128.85    -0.08
 23   0.2202 -23085.82    -1.00   11990.96     1.26
 24   0.2203 -23090.70     0.89   11997.25     0.42
 25   0.2204 -23096.65     1.74   12005.30     1.28
 26   0.2293 -23605.92    -0.46   12590.98    -0.57
 27   0.2293 -23607.82    -0.42   12592.89    -1.02
 28   0.2293 -23609.87    -0.54   12595.65    -0.61

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.

18RR2    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        21.274    21.335    21.214
ecceobj         0.641     0.641     0.641
incobj         40.309    40.308    40.309
qmin           -9.214     7.655     6.967
qmax         ********    41.648   121.032
amean        ********    22.657    34.633
amin           21.109    19.699    21.214
amax         ********    25.040    64.795
emean           0.949     0.634     0.759
emin            0.632     0.585     0.629
emax            1.012     0.664     0.870
imean          68.462    41.822    42.082
imin            2.986    40.647    40.045
imax          176.414    42.640    44.474
excite_mean     1.054     0.920     1.013
fracstop        0.979     0.021     0.118
cjmean          0.000     2.328     1.935

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       301.9     129.1     128.3
kozaiamp        180.0     179.4     180.0