Orbit Fit and Astrometric record for 15VX167

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: 15VX167   
# Created Thu Apr 18 01:10:39 2019
# Orbit generated from Bernstein formalism
# Fitting   28 observations of   28
# Arc:   2.32y
# First observation: 2015/08/20
#  Last observation: 2017/12/13
Preliminary a, adot, b, bdot, g, gdot:
  -0.000149   0.027284   0.000005  -0.009995   0.027349   0.000000
# Chi-squared of fit:     6.23 DOF:   50 RMS:  0.08
# Min/Max residuals:    -0.26    0.25
# Exact a, adot, b, bdot, g, gdot:
  1.571366E-05  2.683268E-02 -5.989698E-06 -9.829406E-03  2.707888E-02  8.805623E-04
# Covariance matrix:
  1.9087E-13 -1.3365E-14  6.7806E-15 -2.9192E-14  1.3166E-13  1.3832E-12
 -1.3365E-14  4.1869E-13  4.7255E-14 -1.9292E-13  2.3615E-13  8.9547E-12
  6.7806E-15  4.7255E-14  1.1121E-13 -9.9407E-14  3.2500E-14  1.3103E-12
 -2.9192E-14 -1.9292E-13 -9.9407E-14  2.0980E-13 -1.3446E-13 -5.3452E-12
  1.3166E-13  2.3615E-13  3.2500E-14 -1.3446E-13  2.7720E-13  6.2741E-12
  1.3832E-12  8.9547E-12  1.3103E-12 -5.3452E-12  6.2741E-12  2.4802E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.479186   53.453750    1.012481    0.000681   -0.065459  2457255.068249
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:            3.81891 +/-     0.689
Argument of Peri:      174.42086 +/-     0.753
Long of Asc Node:      233.19563 +/-     0.000
Inclination:            20.11571 +/-     0.001
Eccentricity:         0.04339997 +/-    0.0001
Semi-Major Axis:     38.68047403 +/-    0.0024
Time of Perihelion: 2456318.3778 +/-     168.2
Perihelion:          37.00174271 +/-    0.0040
Aphelion:            40.35920536 +/-    0.0041
Period (y)              240.5724 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           22.83786631 +/-    0.0004
Ecliptic Y           29.11648941 +/-    0.0006
Ecliptic Z            0.30864996 +/-    0.0000
Ecliptic XDOT        -0.00212356 +/-    0.0000
Ecliptic YDOT         0.00168732 +/-    0.0000
Ecliptic ZDOT        -0.00099298 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.00585572 +/-    0.0005
Geocenter to KBO     36.92915185 +/-    0.0007
# Hcoef:  8.14

The following table shows the complete astrometric record for 15VX167. 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 (15VX167) followed by the observatory code and reference code for the source of the astrometry.

2015 08  20.56746  03 23 45.445  +19 06 01.94  24.1w 15VX167   568  C~2lVk      
2015 09  07.61267  03 23 39.225  +19 04 09.36  24.2w 15VX167   568  C~2lVk      
2015 09  12.46374  03 23 31.622  +19 03 16.75  24.0w 15VX167   568  C~2lVk      
2015 10  07.51519  03 22 16.099  +18 56 26.98  23.8w 15VX167   568  C~2lVk      
2015 10  07.57457  03 22 15.843  +18 56 25.73  24.0w 15VX167   568  C~2lVk      
2015 10  09.55447  03 22 07.597  +18 55 44.45  23.9w 15VX167   568  C~2lVk      
2015 11  06.32832  03 19 48.459  +18 44 28.93  23.5r 15VX167   568  C~2lVk      
2015 11  06.39169  03 19 48.096  +18 44 27.36  22.9r 15VX167   568  C~2lVk      
2015 11  06.46246  03 19 47.699  +18 44 25.32  23.7r 15VX167   568  C~2lVk      
2015 11  07.48432  03 19 42.035  +18 43 58.37  23.8w 15VX167   568  C~2lVk      
2015 11  17.46555  03 18 46.147  +18 39 29.03  23.8w 15VX167   568  C~2lVk      
2015 11  17.55383  03 18 45.639  +18 39 26.55  23.7w 15VX167   568  C~2lVk      
2015 12  06.46917  03 17 03.199  +18 31 03.34  23.8w 15VX167   568  C~2lVk      
2015 12  31.35296  03 15 15.686  +18 21 36.40  24.1w 15VX167   568  C~2lVk      
2016 01  07.38230  03 14 54.329  +18 19 30.18  24.1w 15VX167   568  C~2lVk      
2016 02  04.34615  03 14 20.410  +18 14 25.36  23.9w 15VX167   568  C~2lVk      
2016 02  11.23523  03 14 25.510  +18 14 02.95  24.0w 15VX167   568  C~2lVk      
2016 09  07.59677  03 30 34.372  +18 53 52.95  24.1w 15VX167   568  C~2lVk      
2016 10  05.51115  03 29 21.513  +18 46 48.03  24.0w 15VX167   568  C~2lVk      
2016 10  07.51560  03 29 13.603  +18 46 07.56  24.1w 15VX167   568  C~2lVk      
2016 10  07.61130  03 29 13.204  +18 46 05.50  23.8w 15VX167   568  C~2lVk      
2016 11  04.45547  03 26 57.241  +18 35 11.32  23.9w 15VX167   568  C~2lVk      
2016 12  28.44773  03 22 21.825  +18 13 12.49  23.9w 15VX167   568  C~2lVk      
2017 01  27.31434  03 21 14.204  +18 06 20.83  24.0w 15VX167   568  C~2lVk      
2017 09  15.55809  03 37 17.651  +18 41 16.16  24.1w 15VX167   568  C~2lVk      
2017 09  20.60688  03 37 06.974  +18 40 05.58        15VX167   568  C~2lVk      
2017 12  13.37172  03 30 27.352  +18 08 24.78  24.0w 15VX167   568  C~2lVk      
2017 12  13.40930  03 30 27.162  +18 08 23.86  23.9w 15VX167   568  C~2lVk      

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    -0.01       0.00     0.05
  2   0.0494   -113.58     0.01     -86.88     0.03
  3   0.0627   -231.13     0.02    -110.76     0.00
  4   0.1313  -1370.96     0.07    -237.56     0.02
  5   0.1314  -1374.79    -0.03    -237.85     0.02
  6   0.1369  -1498.43     0.04    -248.21     0.00
  7   0.2129  -3580.95    -0.05    -398.82    -0.22
  8   0.2131  -3586.34    -0.12    -399.02    -0.10
  9   0.2133  -3592.32    -0.14    -399.54    -0.26
 10   0.2161  -3677.02     0.01    -404.99     0.00
 11   0.2434  -4513.98     0.07    -461.36     0.05
 12   0.2436  -4521.60    -0.03    -461.90     0.01
 13   0.2954  -6059.66    -0.08    -571.38     0.22
 14   0.3635  -7686.33    -0.05    -719.57    -0.01
 15   0.3828  -8013.35     0.09    -761.62     0.05
 16   0.4594  -8560.52     0.12    -928.83     0.01
 17   0.4782  -8496.22     0.03    -969.62     0.02
 18   1.0514   5443.69     0.12   -2133.70     0.02
 19   1.1278   4336.58    -0.12   -2295.46     0.25
 20   1.1333   4217.72     0.10   -2307.40    -0.02
 21   1.1336   4211.72     0.03   -2308.02    -0.11
 22   1.2098   2177.70    -0.00   -2469.32     0.01
 23   1.3576  -1947.77    -0.01   -2768.72     0.06
 24   1.4394  -2984.65    -0.01   -2922.95    -0.03
 25   2.0725  10838.55     0.01   -4228.29     0.00
 26   2.0864  10674.12    -0.03   -4261.68    -0.03
 27   2.3157   4688.05     0.00   -4758.45    -0.00
 28   2.3158   4685.20    -0.03   -4758.69    -0.06

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.

15VX167    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        39.020    39.031    39.010
ecceobj         0.051     0.052     0.051
incobj         20.046    20.046    20.046
qmin           36.107    36.009    36.152
qmax           41.604    41.754    41.490
amean          38.755    38.782    38.744
amin           38.464    38.494    38.453
amax           39.062    39.085    39.037
emean           0.050     0.052     0.049
emin            0.038     0.038     0.036
emax            0.066     0.069     0.064
imean          21.861    21.861    21.864
imin           20.828    20.818    20.823
imax           22.666    22.664    22.666
excite_mean     0.376     0.376     0.376
fracstop        1.000     1.000     1.000
cjmean          2.879     2.879     2.879

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       180.0     180.3     179.8
kozaiamp        180.0     180.0     180.0