Orbit Fit and Astrometric record for 15VF171

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: 15VF171   
# Created Thu Feb 21 02:10:27 2019
# Orbit generated from Bernstein formalism
# Fitting   29 observations of   29
# Arc:   2.34y
# First observation: 2015/08/11
#  Last observation: 2017/12/13
Preliminary a, adot, b, bdot, g, gdot:
  -0.000104   0.026134  -0.000020   0.008574   0.026029   0.000000
# Chi-squared of fit:     3.35 DOF:   52 RMS:  0.06
# Min/Max residuals:    -0.14    0.17
# Exact a, adot, b, bdot, g, gdot:
  1.566045E-05  2.560032E-02  5.282153E-06  8.363048E-03  2.563898E-02 -4.569319E-04
# Covariance matrix:
  2.0820E-13 -6.3139E-15 -4.7955E-15  2.6613E-14  1.4198E-13  1.5580E-12
 -6.3139E-15  4.3794E-13 -5.7539E-14  2.2578E-13  2.6928E-13  1.2932E-11
 -4.7955E-15 -5.7539E-14  1.1517E-13 -1.2314E-13 -4.0419E-14 -2.4506E-12
  2.6613E-14  2.2578E-13 -1.2314E-13  2.8215E-13  1.6577E-13  9.4892E-12
  1.4198E-13  2.6928E-13 -4.0419E-14  1.6577E-13  2.9899E-13  9.5250E-12
  1.5580E-12  1.2932E-11 -2.4506E-12  9.4892E-12  9.5250E-12  5.4294E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.513071   51.826114    1.014204    0.001669    0.058614  2457246.064839
# Heliocentric elements and errors
Epoch:              2457240.5000  =  2015/08/06
Mean Anomaly:          335.96813 +/-     0.395
Argument of Peri:       24.26554 +/-     0.494
Long of Asc Node:       54.96741 +/-     0.000
Inclination:            18.13968 +/-     0.001
Eccentricity:         0.09779825 +/-    0.0004
Semi-Major Axis:     42.69109355 +/-    0.0036
Time of Perihelion: 2464041.7599 +/-     111.8
Perihelion:          38.51597939 +/-    0.0181
Aphelion:            46.86620771 +/-    0.0183
Period (y)              278.9421 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           24.85454244 +/-    0.0005
Ecliptic Y           29.97816081 +/-    0.0006
Ecliptic Z           -1.02963726 +/-    0.0000
Ecliptic XDOT        -0.00216672 +/-    0.0000
Ecliptic YDOT         0.00166342 +/-    0.0000
Ecliptic ZDOT         0.00089408 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.95508386 +/-    0.0006
Geocenter to KBO     39.00311575 +/-    0.0008
# Hcoef:  7.97

The following table shows the complete astrometric record for 15VF171. 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 (15VF171) followed by the observatory code and reference code for the source of the astrometry.

2015 08  11.56405  03 19 15.813  +16 45 38.04  23.8w 15VF171   568  C~2nw8      
2015 09  07.63311  03 19 11.853  +16 46 31.23  23.8w 15VF171   568  C~2nw8      
2015 09  12.50083  03 19 03.344  +16 46 11.99  24.0w 15VF171   568  C~2nw8      
2015 10  07.54436  03 17 45.979  +16 42 33.67  24.0w 15VF171   568  C~2nw8      
2015 10  07.60373  03 17 45.727  +16 42 32.90  23.9w 15VF171   568  C~2nw8      
2015 10  09.58362  03 17 37.514  +16 42 08.30  23.9w 15VF171   568  C~2nw8      
2015 11  07.33788  03 15 15.840  +16 34 59.00  23.5r 15VF171   568  C~2nw8      
2015 11  07.38006  03 15 15.610  +16 34 58.31  23.5r 15VF171   568  C~2nw8      
2015 11  07.42224  03 15 15.381  +16 34 57.62  23.5r 15VF171   568  C~2nw8      
2015 11  10.50536  03 14 58.680  +16 34 07.39  23.7w 15VF171   568  C~2nw8      
2015 11  17.35218  03 14 21.522  +16 32 16.49  23.8w 15VF171   568  C~2nw8      
2015 11  17.39878  03 14 21.267  +16 32 15.72  23.9w 15VF171   568  C~2nw8      
2015 12  06.49848  03 12 41.465  +16 27 29.60  23.9w 15VF171   568  C~2nw8      
2016 01  01.34872  03 10 54.885  +16 23 11.12  24.2w 15VF171   568  C~2nw8      
2016 01  07.41130  03 10 37.347  +16 22 42.29  23.9w 15VF171   568  C~2nw8      
2016 01  07.42868  03 10 37.296  +16 22 42.13  24.3w 15VF171   568  C~2nw8      
2016 01  08.25624  03 10 35.179  +16 22 39.43  23.9w 15VF171   568  C~2nw8      
2016 02  05.28768  03 10 03.857  +16 23 50.41  24.0w 15VF171   568  C~2nw8      
2016 02  10.30807  03 10 07.012  +16 24 38.50  24.1w 15VF171   568  C~2nw8      
2016 09  26.58416  03 23 55.537  +17 35 34.20  24.2w 15VF171   568  C~2nw8      
2016 10  09.54522  03 23 07.153  +17 33 25.37  24.1w 15VF171   568  C~2nw8      
2016 10  09.61729  03 23 06.853  +17 33 24.48  24.1w 15VF171   568  C~2nw8      
2016 11  04.40084  03 21 00.791  +17 27 26.54  23.9w 15VF171   568  C~2nw8      
2016 12  24.31334  03 16 49.407  +17 16 00.04  24.2w 15VF171   568  C~2nw8      
2016 12  25.28177  03 16 45.693  +17 15 51.68  24.5w 15VF171   568  C~2nw8      
2016 12  28.42845  03 16 34.050  +17 15 25.60  24.1w 15VF171   568  C~2nw8      
2017 01  02.41556  03 16 17.320  +17 14 51.23        15VF171   568  C~2nw8      
2017 12  13.39064  03 23 11.494  +18 09 32.76  23.8w 15VF171   568  C~2nw8      
2017 12  13.42791  03 23 11.310  +18 09 32.25  23.9w 15VF171   568  C~2nw8      

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     0.03       0.00    -0.03
  2   0.0741    -41.31    -0.04      66.01    -0.03
  3   0.0874   -164.35    -0.01      78.81    -0.04
  4   0.1560  -1294.39    -0.03     154.36     0.02
  5   0.1562  -1298.09    -0.10     154.55    -0.00
  6   0.1616  -1418.43    -0.06     161.31    -0.03
  7   0.2403  -3496.41     0.08     276.54     0.06
  8   0.2404  -3499.78     0.09     276.74     0.05
  9   0.2405  -3503.14     0.12     276.93     0.03
 10   0.2490  -3748.10    -0.13     291.31     0.04
 11   0.2677  -4292.96     0.01     324.45    -0.00
 12   0.2679  -4296.70     0.03     324.67    -0.03
 13   0.3201  -5757.62    -0.04     427.21    -0.03
 14   0.3909  -7306.22     0.01     585.66     0.01
 15   0.4075  -7557.48     0.08     625.29     0.03
 16   0.4076  -7558.23    -0.01     625.33    -0.04
 17   0.4098  -7588.35     0.03     630.87     0.07
 18   0.4866  -8004.29     0.02     820.00    -0.05
 19   0.5003  -7947.59    -0.14     854.20     0.03
 20   1.1280   4638.89     0.06    1880.66    -0.05
 21   1.1635   3936.52    -0.04    1929.89    -0.01
 22   1.1637   3932.14     0.08    1930.11    -0.08
 23   1.2343   2096.46    -0.04    2040.47    -0.02
 24   1.3710  -1558.30    -0.08    2302.65    -0.01
 25   1.3736  -1611.85     0.17    2308.40     0.15
 26   1.3822  -1779.70    -0.05    2326.59    -0.00
 27   1.3959  -2020.08    -0.01    2355.79    -0.08
 28   2.3404   4543.02     0.01    4012.78     0.03
 29   2.3405   4540.35    -0.06    4012.95    -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.

15VF171    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        43.093    43.101    43.084
ecceobj         0.103     0.103     0.103
incobj         18.079    18.080    18.079
qmin           37.666    37.694    37.680
qmax           48.059    48.141    48.060
amean          42.747    42.759    42.736
amin           42.412    42.421    42.392
amax           43.110    43.125    43.106
emean           0.101     0.101     0.101
emin            0.086     0.087     0.087
emax            0.116     0.117     0.116
imean          16.728    16.728    16.726
imin           16.178    16.166    16.186
imax           17.324    17.325    17.326
excite_mean     0.305     0.305     0.305
fracstop        1.000     1.000     1.000
cjmean          2.975     2.975     2.975

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       181.4     179.1     181.9
kozaiamp        179.9     179.9     180.0