Orbit Fit and Astrometric record for 15VL171

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: 15VL171   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting     27 observations of     27
# Arc:   2.04y
# First observation: 2015/09/07
#  Last observation: 2017/09/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.000098   0.019852  -0.000002   0.000245   0.021527   0.000000
# Chi-squared of fit:     3.30 DOF:     48 RMS:  0.06
# Min/Max residuals:    -0.11    0.15
# Exact a, adot, b, bdot, g, gdot:
  1.476568E-05  1.968963E-02  4.559769E-07  2.431300E-04  2.148519E-02 -4.722795E-04
# Covariance matrix:
  2.5893E-13 -4.3749E-14  1.4600E-15  5.6052E-16  1.8752E-13  3.0836E-12
 -4.3749E-14  3.5280E-13  5.9711E-16  2.5619E-15  1.7025E-13  9.2300E-12
  1.4600E-15  5.9711E-16  1.1735E-13 -9.6623E-14  1.9613E-15  3.4041E-14
  5.6052E-16  2.5619E-15 -9.6623E-14  1.4657E-13  2.0065E-15  1.1411E-13
  1.8752E-13  1.7025E-13  1.9613E-15  2.0065E-15  3.0218E-13  8.4246E-12
  3.0836E-12  9.2300E-12  3.4041E-14  1.1411E-13  8.4246E-12  4.1705E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.460158   51.974530    0.933496   -0.009747   -0.388215  2457273.133899
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          269.49313 +/-     0.140
Argument of Peri:       30.88340 +/-     0.129
Long of Asc Node:      115.74599 +/-     0.036
Inclination:             1.59865 +/-     0.000
Eccentricity:         0.04634923 +/-    0.0010
Semi-Major Axis:     46.81917324 +/-    0.0055
Time of Perihelion: 2486688.4948 +/-      45.3
Perihelion:          44.64914047 +/-    0.0486
Aphelion:            48.98920601 +/-    0.0486
Period (y)              320.3641 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           29.63260638 +/-    0.0007
Ecliptic Y           36.38294037 +/-    0.0009
Ecliptic Z           -1.18598915 +/-    0.0000
Ecliptic XDOT        -0.00201491 +/-    0.0000
Ecliptic YDOT         0.00149241 +/-    0.0000
Ecliptic ZDOT         0.00003256 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   46.93843074 +/-    0.0009
Geocenter to KBO     46.54369668 +/-    0.0012
# Hcoef:  7.66

The following table shows the complete astrometric record for 15VL171. 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 (15VL171) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.63311  03 19 48.365  +16 50 59.10  24.7w 15VL171   568  C~2nw9      
2015 09  12.49674  03 19 41.385  +16 50 24.55  24.4w 15VL171   568  C~2nw9      
2015 10  07.54436  03 18 37.684  +16 45 46.78  24.5w 15VL171   568  C~2nw9      
2015 10  07.60373  03 18 37.480  +16 45 46.11  24.6w 15VL171   568  C~2nw9      
2015 11  07.33788  03 16 33.844  +16 37 31.19  23.7r 15VL171   568  C~2nw9      
2015 11  07.38006  03 16 33.661  +16 37 30.54  24.0r 15VL171   568  C~2nw9      
2015 11  07.42224  03 16 33.472  +16 37 29.74  24.1r 15VL171   568  C~2nw9      
2015 11  10.50536  03 16 19.683  +16 36 36.26  24.7w 15VL171   568  C~2nw9      
2015 11  17.35218  03 15 48.977  +16 34 38.03  24.5w 15VL171   568  C~2nw9      
2015 11  17.39878  03 15 48.768  +16 34 37.23  24.4w 15VL171   568  C~2nw9      
2015 12  06.36096  03 14 26.711  +16 29 28.73  24.6w 15VL171   568  C~2nw9      
2015 12  06.49848  03 14 26.146  +16 29 26.60  24.3w 15VL171   568  C~2nw9      
2016 01  01.34872  03 12 57.383  +16 24 12.33  24.6w 15VL171   568  C~2nw9      
2016 01  07.41130  03 12 42.655  +16 23 24.87  24.9w 15VL171   568  C~2nw9      
2016 02  05.28768  03 12 13.724  +16 22 28.63  24.8w 15VL171   568  C~2nw9      
2016 02  10.30807  03 12 16.140  +16 22 48.89  25.0w 15VL171   568  C~2nw9      
2016 09  07.62568  03 24 20.253  +17 08 50.63        15VL171   568  C~2nw9      
2016 09  26.58416  03 23 43.142  +17 06 04.00  24.5w 15VL171   568  C~2nw9      
2016 10  09.54522  03 23 03.227  +17 03 20.10  24.6w 15VL171   568  C~2nw9      
2016 10  09.61729  03 23 02.957  +17 03 19.09  24.8w 15VL171   568  C~2nw9      
2016 11  02.51995  03 21 27.397  +16 57 05.24  24.6w 15VL171   568  C~2nw9      
2016 11  04.39506  03 21 19.139  +16 56 33.73  24.6w 15VL171   568  C~2nw9      
2016 12  24.33186  03 17 51.703  +16 43 58.59  24.6w 15VL171   568  C~2nw9      
2017 01  02.43457  03 17 25.097  +16 42 30.89  24.8w 15VL171   568  C~2nw9      
2017 01  27.28684  03 16 44.703  +16 40 42.72  24.7w 15VL171   568  C~2nw9      
2017 09  15.58250  03 28 42.957  +17 25 31.87  24.7w 15VL171   568  C~2nw9      
2017 09  22.56874  03 28 28.848  +17 24 30.47  24.7w 15VL171   568  C~2nw9      

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    -0.06       0.00    -0.06
     2   0.0133   -105.71    -0.04      -7.73     0.03
     3   0.0819  -1061.10     0.02     -41.27    -0.04
     4   0.0821  -1064.11     0.07     -41.16     0.11
     5   0.1662  -2908.23    -0.07     -59.66     0.03
     6   0.1663  -2910.94     0.05     -59.60     0.07
     7   0.1664  -2913.77     0.06     -59.67    -0.00
     8   0.1749  -3119.10    -0.11     -59.76     0.01
     9   0.1936  -3576.19    -0.05     -58.89    -0.00
    10   0.1937  -3579.30    -0.00     -58.88    -0.02
    11   0.2457  -4799.38     0.00     -47.85     0.03
    12   0.2460  -4807.78     0.06     -47.77    -0.04
    13   0.3168  -6123.36     0.09     -14.58    -0.02
    14   0.3334  -6340.50     0.11      -4.30     0.02
    15   0.4125  -6757.29    -0.11      51.77    -0.07
    16   0.4262  -6718.35    -0.07      62.10    -0.10
    17   1.0020   4044.88    -0.01      48.93     0.07
    18   1.0539   3487.92    -0.05      21.06    -0.06
    19   1.0894   2892.62     0.15       6.44     0.04
    20   1.0896   2888.62    -0.05       6.43     0.10
    21   1.1551   1467.73     0.07      -8.43    -0.05
    22   1.1602   1345.11     0.01      -8.79    -0.00
    23   1.2969  -1727.15    -0.06      24.55    -0.05
    24   1.3218  -2119.08    -0.04      38.70     0.03
    25   1.3899  -2707.73     0.03      84.75    -0.05
    26   2.0231   7941.59    -0.09      87.04     0.06
    27   2.0423   7730.47     0.06      77.00    -0.04

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.

15VL171    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        47.264    47.277    47.251
ecceobj         0.042     0.043     0.040
incobj          1.600     1.600     1.599
qmin           44.023    43.946    44.088
qmax           49.963    50.071    49.871
amean          46.906    46.919    46.893
amin           46.535    46.546    46.516
amax           47.295    47.306    47.289
emean           0.045     0.046     0.044
emin            0.033     0.034     0.031
emax            0.057     0.059     0.055
imean           0.525     0.524     0.526
imin            0.180     0.179     0.182
imax            0.802     0.802     0.803
excite_mean     0.046     0.047     0.045
fracstop        1.000     1.000     1.000
cjmean          3.135     3.135     3.135

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       185.5     185.6     185.6
kozaiamp        180.0     180.0     180.0