Orbit Fit and Astrometric record for 15VL168

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: 15VL168   
# Created Fri Dec  3 02:13:39 2021
# Orbit generated from Bernstein formalism
# Fitting     30 observations of     30
# Arc:   2.27y
# First observation: 2015/09/07
#  Last observation: 2017/12/16
Preliminary a, adot, b, bdot, g, gdot:
  -0.000011   0.009086   0.000006  -0.002639   0.013988   0.000000
# Chi-squared of fit:     7.69 DOF:     54 RMS:  0.09
# Min/Max residuals:    -0.24    0.22
# Exact a, adot, b, bdot, g, gdot:
  1.032405E-05  9.038227E-03 -3.090071E-06 -2.599146E-03  1.392347E-02 -6.016247E-03
# Covariance matrix:
  2.8079E-13 -5.1511E-14  1.8046E-14 -8.0051E-14  2.6084E-13  1.7133E-11
 -5.1511E-14  1.5588E-13  2.7558E-15 -1.2024E-14  5.7162E-14  2.5754E-12
  1.8046E-14  2.7558E-15  1.1032E-13 -1.0805E-13  3.1410E-14  3.3838E-12
 -8.0051E-14 -1.2024E-14 -1.0805E-13  2.1625E-13 -1.3993E-13 -1.5231E-11
  2.6084E-13  5.7162E-14  3.1410E-14 -1.3993E-13  4.0261E-13  2.9943E-11
  1.7133E-11  2.5754E-12  3.3838E-12 -1.5231E-11  2.9943E-11  3.2576E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.401278   51.776106    0.932174   -0.002593   -0.391496  2457273.129809
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          319.21330 +/-     0.539
Argument of Peri:      289.89469 +/-     0.155
Long of Asc Node:      229.66525 +/-     0.000
Inclination:            16.20733 +/-     0.002
Eccentricity:         0.57126312 +/-    0.0048
Semi-Major Axis:     87.80449154 +/-    0.7108
Time of Perihelion: 2491318.3411 +/-     176.6
Perihelion:          37.64502405 +/-    0.5192
Aphelion:           137.96395904 +/-    1.1934
Period (y)              822.7792 +/-      9.99
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           45.40764252 +/-    0.0020
Ecliptic Y           56.15185545 +/-    0.0026
Ecliptic Z           -0.50321847 +/-    0.0000
Ecliptic XDOT        -0.00213223 +/-    0.0000
Ecliptic YDOT         0.00016106 +/-    0.0000
Ecliptic ZDOT        -0.00050273 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   72.21591306 +/-    0.0024
Geocenter to KBO     71.82115165 +/-    0.0033
# Hcoef:  6.11

The following table shows the complete astrometric record for 15VL168. 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 (15VL168) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.62902  03 17 51.670  +17 49 19.01  24.8w 15VL168   568  C~2lVm      
2015 09  12.49264  03 17 46.454  +17 48 50.00  24.8w 15VL168   568  C~2lVm      
2015 10  07.53854  03 17 01.694  +17 45 13.53  24.7w 15VL168   568  C~2lVm      
2015 10  07.59790  03 17 01.562  +17 45 12.92  25.0w 15VL168   568  C~2lVm      
2015 10  09.57780  03 16 56.900  +17 44 51.56  24.6w 15VL168   568  C~2lVm      
2015 11  07.33264  03 15 37.528  +17 38 57.42  24.8r 15VL168   568  C~2lVm      
2015 11  07.37479  03 15 37.400  +17 38 56.86  24.4r 15VL168   568  C~2lVm      
2015 11  07.41697  03 15 37.279  +17 38 56.19  24.4r 15VL168   568  C~2lVm      
2015 11  10.49950  03 15 27.955  +17 38 15.54  24.8w 15VL168   568  C~2lVm      
2015 11  17.34635  03 15 07.223  +17 36 44.59  24.4w 15VL168   568  C~2lVm      
2015 11  17.39294  03 15 07.082  +17 36 44.04  24.9w 15VL168   568  C~2lVm      
2015 12  06.35508  03 14 11.578  +17 32 40.66  25.2w 15VL168   568  C~2lVm      
2015 12  06.49265  03 14 11.200  +17 32 38.53  25.6w 15VL168   568  C~2lVm      
2016 01  01.34294  03 13 10.387  +17 28 07.19  24.6w 15VL168   568  C~2lVm      
2016 01  07.40549  03 13 00.043  +17 27 19.16  25.2w 15VL168   568  C~2lVm      
2016 01  08.25043  03 12 58.762  +17 27 13.20  24.5w 15VL168   568  C~2lVm      
2016 02  05.28189  03 12 37.634  +17 25 18.04  25.0w 15VL168   568  C~2lVm      
2016 02  10.30227  03 12 38.598  +17 25 16.30  25.2w 15VL168   568  C~2lVm      
2016 09  06.61138  03 20 08.269  +17 48 40.39  25.3w 15VL168   568  C~2lVm      
2016 09  26.60062  03 19 39.985  +17 46 14.21  24.8w 15VL168   568  C~2lVm      
2016 10  10.40808  03 19 09.948  +17 43 54.36  25.0w 15VL168   568  C~2lVm      
2016 10  10.46643  03 19 09.793  +17 43 53.81  24.5w 15VL168   568  C~2lVm      
2016 10  27.49100  03 18 24.091  +17 40 29.83  24.6w 15VL168   568  C~2lVm      
2016 11  02.52573  03 18 06.354  +17 39 12.04  24.7w 15VL168   568  C~2lVm      
2016 11  04.40084  03 18 00.753  +17 38 47.43  25.1w 15VL168   568  C~2lVm      
2016 12  24.31334  03 15 40.323  +17 28 36.72        15VL168   568  C~2lVm      
2017 01  02.41556  03 15 22.073  +17 27 15.42  24.3w 15VL168   568  C~2lVm      
2017 01  26.32908  03 14 53.807  +17 25 00.43  25.2w 15VL168   568  C~2lVm      
2017 01  26.34230  03 14 53.791  +17 25 00.30  25.2w 15VL168   568  C~2lVm      
2017 12  16.39181  03 18 16.704  +17 29 17.28  24.9w 15VL168   568  C~2lVm      

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     0.03
     2   0.0133    -79.46    -0.02      -8.76    -0.07
     3   0.0819   -753.03    -0.03     -52.18     0.03
     4   0.0821   -755.01     0.09     -52.28     0.02
     5   0.0875   -824.88    -0.06     -55.61     0.03
     6   0.1662  -2012.26     0.07    -102.00    -0.05
     7   0.1663  -2014.17     0.08    -102.07    -0.06
     8   0.1664  -2016.02     0.16    -102.26    -0.20
     9   0.1749  -2155.30    -0.07    -106.64     0.07
    10   0.1936  -2465.20    -0.03    -116.83     0.06
    11   0.1937  -2467.29     0.02    -116.83     0.12
    12   0.2457  -3297.19    -0.08    -143.22     0.22
    13   0.2460  -3302.97    -0.08    -143.86    -0.24
    14   0.3168  -4213.99    -0.04    -176.04     0.02
    15   0.3334  -4369.50    -0.20    -183.20    -0.06
    16   0.3357  -4388.76    -0.03    -184.09     0.04
    17   0.4125  -4710.98     0.13    -215.03     0.01
    18   0.4262  -4698.13     0.16    -220.37     0.04
    19   0.9993   1875.29    -0.05    -538.78     0.14
    20   1.0540   1447.34     0.05    -576.72    -0.04
    21   1.0918    996.70     0.09    -601.81    -0.09
    22   1.0920    994.42    -0.03    -601.77     0.03
    23   1.1386    310.84    -0.04    -630.82     0.07
    24   1.1551     45.84    -0.05    -640.57     0.09
    25   1.1602    -37.86    -0.01    -643.66    -0.01
    26   1.2969  -2135.92    -0.05    -711.61    -0.13
    27   1.3218  -2409.26    -0.12    -721.80    -0.15
    28   1.3873  -2835.08     0.12    -746.10     0.05
    29   1.3873  -2835.33    -0.02    -746.17     0.00
    30   2.2745     35.33     0.04   -1253.39     0.03

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.

15VL168    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        88.345    90.516    86.330
ecceobj         0.567     0.581     0.553
incobj         16.099    16.098    16.100
qmin           37.003    36.599    37.284
qmax          142.851   147.061   137.181
amean          87.950    89.924    85.676
amin           86.241    88.060    84.326
amax           90.604    92.259    87.651
emean           0.563     0.580     0.555
emin            0.549     0.565     0.546
emax            0.580     0.594     0.565
imean          18.084    17.679    17.069
imin           16.989    16.959    16.879
imax           18.996    18.671    17.225
excite_mean     0.643     0.654     0.628
fracstop        1.000     1.000     1.000
cjmean          3.026     3.018     3.035

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       174.7     152.7     159.1
kozaiamp        180.0     180.0     180.0