Orbit Fit and Astrometric record for 15VQ164

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: 15VQ164   
# Created Sun Apr 21 01:10:12 2019
# Orbit generated from Bernstein formalism
# Fitting   21 observations of   21
# Arc:   1.23y
# First observation: 2015/11/06
#  Last observation: 2017/01/27
Preliminary a, adot, b, bdot, g, gdot:
   0.000048   0.042387  -0.000002   0.011357   0.034220   0.000000
# Chi-squared of fit:     6.59 DOF:   36 RMS:  0.10
# Min/Max residuals:    -0.27    0.26
# Exact a, adot, b, bdot, g, gdot:
  2.015748E-05  4.251728E-02  5.370638E-06  1.141237E-02  3.444227E-02 -1.500203E-03
# Covariance matrix:
  2.7634E-13  5.6429E-13 -1.8069E-14  2.5498E-13  5.4674E-13  2.0200E-11
  5.6429E-13  5.9737E-12 -1.3796E-13  1.9626E-12  3.2126E-12  1.5558E-10
 -1.8069E-14 -1.3796E-13  1.3705E-13 -1.9208E-13 -8.0538E-14 -3.8118E-12
  2.5498E-13  1.9626E-12 -1.9208E-13  1.0124E-12  1.1402E-12  5.4200E-11
  5.4674E-13  3.2126E-12 -8.0538E-14  1.1402E-12  2.2119E-12  9.0354E-11
  2.0200E-11  1.5558E-10 -3.8118E-12  5.4200E-11  9.0354E-11  4.2966E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.590867   53.835375    0.182912   -0.009910   -0.977761  2457332.813359
# Heliocentric elements and errors
Epoch:              2457330.5000  =  2015/11/04
Mean Anomaly:          352.82236 +/-     0.247
Argument of Peri:        9.95202 +/-     0.424
Long of Asc Node:       55.61768 +/-     0.000
Inclination:            15.04784 +/-     0.001
Eccentricity:         0.24489115 +/-    0.0004
Semi-Major Axis:     39.56660218 +/-    0.0098
Time of Perihelion: 2459142.9688 +/-      62.5
Perihelion:          29.87709137 +/-    0.0168
Aphelion:            49.25611299 +/-    0.0194
Period (y)              248.8865 +/-      0.09
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           17.85285757 +/-    0.0007
Ecliptic Y           24.11949411 +/-    0.0010
Ecliptic Z           -0.29926968 +/-    0.0000
Ecliptic XDOT        -0.00279482 +/-    0.0000
Ecliptic YDOT         0.00189902 +/-    0.0000
Ecliptic ZDOT         0.00090840 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   30.00939989 +/-    0.0009
Geocenter to KBO     29.03409385 +/-    0.0013
# Hcoef:  9.87

The following table shows the complete astrometric record for 15VQ164. 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 (15VQ164) followed by the observatory code and reference code for the source of the astrometry.

2015 11  06.31257  03 26 26.500  +18 09 32.79  24.4r 15VQ164   568  C~2lVX      
2015 11  06.37589  03 26 26.069  +18 09 31.43  24.1r 15VQ164   568  C~2lVX      
2015 11  06.44667  03 26 25.600  +18 09 30.35  24.6r 15VQ164   568  C~2lVX      
2015 11  07.46686  03 26 18.694  +18 09 12.03  24.4w 15VQ164   568  C~2lVX      
2015 11  17.44798  03 25 10.321  +18 06 08.26  24.5w 15VQ164   568  C~2lVX      
2015 11  17.49527  03 25 09.988  +18 06 07.34  24.5w 15VQ164   568  C~2lVX      
2015 12  06.31417  03 23 04.171  +18 00 33.41  24.6w 15VQ164   568  C~2lVX      
2015 12  06.44064  03 23 03.369  +18 00 31.42  25.5w 15VQ164   568  C~2lVX      
2015 12  06.44787  03 23 03.315  +18 00 31.12  24.8w 15VQ164   568  C~2lVX      
2015 12  31.33561  03 20 48.945  +17 55 09.99  25.7w 15VQ164   568  C~2lVX      
2016 01  07.36493  03 20 21.892  +17 54 20.29  24.7w 15VQ164   568  C~2lVX      
2016 01  07.41708  03 20 21.721  +17 54 20.22  24.4w 15VQ164   568  C~2lVY      
2016 02  11.26421  03 19 42.545  +17 56 10.39  24.6w 15VQ164   568  C~2lVY      
2016 10  10.56485  03 38 22.462  +19 28 47.89  24.5w 15VQ164   568  C~2lVY      
2016 10  10.61331  03 38 22.212  +19 28 47.29  24.7w 15VQ164   568  C~2lVY      
2016 10  28.44727  03 36 39.477  +19 25 00.01  24.7w 15VQ164   568  C~2lVY      
2016 10  29.52078  03 36 32.584  +19 24 43.92  24.9w 15VQ164   568  C~2lVY      
2016 10  29.54425  03 36 32.440  +19 24 43.59  24.9w 15VQ164   568  C~2lVY      
2016 11  02.57381  03 36 06.054  +19 23 40.84  24.3w 15VQ164   568  C~2lVY      
2016 12  24.36580  03 30 29.569  +19 09 57.08  24.7w 15VQ164   568  C~2lVY      
2017 01  27.33784  03 28 40.412  +19 07 02.44  24.7w 15VQ164   568  C~2lVY      

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    -0.13       0.00    -0.03
  2   0.0002     -6.29    -0.16       0.20    -0.27
  3   0.0004    -13.03     0.12       0.80    -0.14
  4   0.0032   -112.94     0.03       7.38     0.04
  5   0.0305  -1102.77    -0.01      71.03     0.07
  6   0.0306  -1107.60    -0.05      71.32     0.05
  7   0.0821  -2928.59     0.04     196.75     0.06
  8   0.0825  -2940.17     0.26     197.70     0.10
  9   0.0825  -2940.99     0.11     197.60    -0.05
 10   0.1506  -4877.88    -0.03     371.93    -0.01
 11   0.1699  -5264.16    -0.26     422.23     0.01
 12   0.1700  -5266.54    -0.02     422.79     0.19
 13   0.2654  -5779.37     0.10     672.22     0.04
 14   0.9288  11017.62     0.03    2190.12     0.03
 15   0.9290  11014.03    -0.01    2190.35    -0.06
 16   0.9778   9544.13    -0.08    2306.02    -0.02
 17   0.9807   9445.34    -0.02    2313.09     0.04
 18   0.9808   9443.28     0.13    2313.24     0.04
 19   0.9918   9064.86    -0.03    2339.35    -0.06
 20   1.1336   4235.90    -0.04    2671.03    -0.01
 21   1.2266   2692.40     0.01    2877.05    -0.01

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.

15VQ164    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.997    40.038    39.958
ecceobj         0.251     0.252     0.251
incobj         15.006    15.006    15.006
qmin           28.038    28.756    27.680
qmax           51.456    50.885    51.792
amean          39.455    39.455    39.455
amin           38.974    38.898    38.984
amax           40.041    40.085    39.991
emean           0.243     0.252     0.249
emin            0.184     0.230     0.180
emax            0.288     0.271     0.296
imean          13.516    12.993    13.083
imin           11.143    12.152    10.415
imax           16.252    14.207    15.953
excite_mean     0.338     0.338     0.338
fracstop        1.000     1.000     1.000
cjmean          2.922     2.922     2.922

libcent 0       180.1     180.3     180.0
libamp  0       101.6     129.7      84.9
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        87.4     148.6      98.6
kozaiamp         83.6     179.9      92.2