Orbit Fit and Astrometric record for 15VD167

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: 15VD167   
# Created Fri Feb 22 02:10:30 2019
# Orbit generated from Bernstein formalism
# Fitting   25 observations of   25
# Arc:   2.04y
# First observation: 2015/09/07
#  Last observation: 2017/09/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.000206   0.030363   0.000041   0.008861   0.027389   0.000000
# Chi-squared of fit:     6.89 DOF:   44 RMS:  0.09
# Min/Max residuals:    -0.35    0.33
# Exact a, adot, b, bdot, g, gdot:
  1.758506E-05  3.049081E-02  5.217701E-06  8.967000E-03  2.753928E-02  9.204553E-03
# Covariance matrix:
  2.4049E-13 -2.1509E-14 -6.3511E-15  3.1482E-14  1.8030E-13  1.8285E-12
 -2.1509E-14  6.6825E-13 -3.9398E-14  2.0108E-13  2.8704E-13  1.1605E-11
 -6.3511E-15 -3.9398E-14  1.0988E-13 -9.5925E-14 -2.3484E-14 -8.6492E-13
  3.1482E-14  2.0108E-13 -9.5925E-14  2.1095E-13  1.1877E-13  4.4105E-12
  1.8030E-13  2.8704E-13 -2.3484E-14  1.1877E-13  3.2772E-13  6.8678E-12
  1.8285E-12  1.1605E-11 -8.6492E-13  4.4105E-12  6.8678E-12  2.5458E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.079220   54.749554    0.951432    0.000620   -0.342100  2457273.097159
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:           21.52602 +/-     0.020
Argument of Peri:      307.93098 +/-     0.049
Long of Asc Node:       52.99795 +/-     0.000
Inclination:            16.28815 +/-     0.001
Eccentricity:         0.41297934 +/-    0.0005
Semi-Major Axis:     55.35299664 +/-    0.0295
Time of Perihelion: 2448276.1152 +/-       4.3
Perihelion:          32.49335266 +/-    0.0333
Aphelion:            78.21264062 +/-    0.0504
Period (y)              411.8318 +/-      0.33
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           21.92769823 +/-    0.0004
Ecliptic Y           29.38349920 +/-    0.0006
Ecliptic Z            0.05040582 +/-    0.0000
Ecliptic XDOT        -0.00194989 +/-    0.0000
Ecliptic YDOT         0.00248937 +/-    0.0000
Ecliptic ZDOT         0.00089278 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.66355841 +/-    0.0006
Geocenter to KBO     36.31177444 +/-    0.0008
# Hcoef:  9.20

The following table shows the complete astrometric record for 15VD167. 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 (15VD167) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.59637  03 29 29.373  +19 01 57.74  25.2w 15VD167   568  C~2lVh      
2015 09  12.44325  03 29 22.128  +19 01 57.92  24.8w 15VD167   568  C~2lVh      
2015 10  07.49180  03 28 07.524  +18 59 47.19  25.2w 15VD167   568  C~2lVh      
2015 10  07.55020  03 28 07.260  +18 59 46.73  24.6w 15VD167   568  C~2lVh      
2015 10  09.53094  03 27 59.016  +18 59 27.80  25.1w 15VD167   568  C~2lVh      
2015 11  06.30734  03 25 38.421  +18 53 30.33  24.5r 15VD167   568  C~2lVh      
2015 11  06.37060  03 25 38.059  +18 53 29.39  24.6r 15VD167   568  C~2lVh      
2015 11  06.44142  03 25 37.657  +18 53 28.46  24.6r 15VD167   568  C~2lVh      
2015 11  07.46098  03 25 31.899  +18 53 12.86  24.9w 15VD167   568  C~2lVh      
2015 11  17.44217  03 24 34.837  +18 50 37.96  24.7w 15VD167   568  C~2lVh      
2015 11  17.48946  03 24 34.557  +18 50 37.19  24.8w 15VD167   568  C~2lVh      
2015 12  06.30809  03 22 49.615  +18 45 49.64  25.0w 15VD167   568  C~2lVh      
2015 12  06.43481  03 22 48.956  +18 45 47.52  25.4w 15VD167   568  C~2lVh      
2015 12  31.32982  03 20 56.231  +18 40 54.47  24.9w 15VD167   568  C~2lVh      
2016 01  07.35914  03 20 33.288  +18 40 03.21  24.9w 15VD167   568  C~2lVh      
2016 02  05.30505  03 19 53.255  +18 39 51.08  25.6w 15VD167   568  C~2lVh      
2016 02  11.25843  03 19 56.753  +18 40 31.61  25.0w 15VD167   568  C~2lVh      
2016 09  25.62935  03 35 27.596  +19 56 03.72  25.1w 15VD167   568  C~2lVh      
2016 10  10.56895  03 34 32.993  +19 54 26.26  25.0w 15VD167   568  C~2lVh      
2016 10  10.61736  03 34 32.780  +19 54 25.86  25.2w 15VD167   568  C~2lVh      
2016 12  24.36580  03 28 01.239  +19 38 02.98  24.8w 15VD167   568  C~2lVh      
2017 01  27.32921  03 26 30.573  +19 34 54.77  25.0w 15VD167   568  C~2lVh      
2017 09  16.58439  03 42 26.561  +20 49 10.46  24.8w 15VD167   568  C~2lVh      
2017 09  17.58740  03 42 24.589  +20 49 10.83  24.7w 15VD167   568  C~2lVh      
2017 09  22.61102  03 42 13.161  +20 49 07.44  24.9w 15VD167   568  C~2lVh      

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    -0.02       0.00    -0.01
  2   0.0133    -99.61    -0.06      25.13    -0.03
  3   0.0818  -1157.56     0.10     156.37    -0.06
  4   0.0820  -1161.30    -0.15     156.84     0.08
  5   0.0874  -1279.31     0.06     167.12    -0.06
  6   0.1635  -3300.87    -0.06     312.48    -0.01
  7   0.1637  -3306.08    -0.07     312.85    -0.01
  8   0.1638  -3311.84     0.02     313.36     0.10
  9   0.1666  -3394.89    -0.01     318.54    -0.03
 10   0.1940  -4218.19    -0.01     370.17     0.04
 11   0.1941  -4222.23    -0.07     370.42     0.04
 12   0.2456  -5737.73    -0.04     465.82     0.02
 13   0.2460  -5747.33     0.21     466.13    -0.35
 14   0.3141  -7372.40    -0.03     588.35    -0.04
 15   0.3334  -7701.17     0.05     621.89     0.04
 16   0.4126  -8255.14     0.10     755.66     0.33
 17   0.4289  -8196.62    -0.05     782.14     0.08
 18   1.0514   5695.52     0.12    1943.70    -0.08
 19   1.0923   4923.61     0.05    2029.92    -0.02
 20   1.0925   4920.59     0.03    2030.24     0.02
 21   1.2971   -681.77    -0.02    2404.21    -0.06
 22   1.3901  -1969.98    -0.10    2536.96     0.05
 23   2.0260  12174.21     0.03    3698.66    -0.01
 24   2.0287  12147.25    -0.00    3705.22     0.00
 25   2.0425  11989.80    -0.07    3737.83     0.00

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.

15VD167    quality flag:3

Type:         5:2EEE    5:2EEE    5:2EEE
Type:         5:2EII              5:2EII

axisobj        56.312    56.409    56.215
ecceobj         0.423     0.425     0.422
incobj         16.241    16.241    16.242
qmin           31.682    31.629    31.765
qmax           80.321    80.693    80.255
amean          55.461    55.462    55.461
amin           54.784    54.703    54.826
amax           56.384    56.419    56.337
emean           0.415     0.413     0.415
emin            0.401     0.395     0.405
emax            0.428     0.431     0.427
imean          15.174    15.527    15.122
imin           14.766    14.651    14.846
imax           15.844    16.431    15.500
excite_mean     0.491     0.492     0.491
fracstop        1.000     1.000     1.000
cjmean          2.926     2.925     2.926

libcent 0       179.7     180.1     179.2
libamp  0        61.9      96.0      41.7
libcent 1       191.2    -180.0     177.0
libamp  1       168.8    -180.0     137.4
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       152.3     134.2     164.5
kozaiamp        180.0     180.0     180.0