Orbit Fit and Astrometric record for 15VS170

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: 15VS170   
# Created Fri Dec  3 02:13:41 2021
# Orbit generated from Bernstein formalism
# Fitting     25 observations of     25
# Arc:   2.27y
# First observation: 2015/09/07
#  Last observation: 2017/12/16
Preliminary a, adot, b, bdot, g, gdot:
  -0.000142   0.023494   0.000002   0.007713   0.024775   0.000000
# Chi-squared of fit:     4.92 DOF:     44 RMS:  0.08
# Min/Max residuals:    -0.25    0.17
# Exact a, adot, b, bdot, g, gdot:
  1.513075E-05  2.333658E-02  4.882271E-06  7.666784E-03  2.476738E-02  8.825293E-04
# Covariance matrix:
  2.7712E-13  4.6588E-14 -1.2493E-14  6.0388E-14  2.3519E-13  3.8595E-12
  4.6588E-14  4.0670E-13 -3.1680E-14  1.5497E-13  2.6849E-13  9.8603E-12
 -1.2493E-14 -3.1680E-14  1.1043E-13 -9.3763E-14 -2.8502E-14 -1.0916E-12
  6.0388E-14  1.5497E-13 -9.3763E-14  2.0361E-13  1.3869E-13  5.3425E-12
  2.3519E-13  2.6849E-13 -2.8502E-14  1.3869E-13  3.7379E-13  8.8417E-12
  3.8595E-12  9.8603E-12 -1.0916E-12  5.3425E-12  8.8417E-12  3.3986E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.104826   51.903275    0.933041    0.000861   -0.389433  2457273.129809
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:           37.35711 +/-     1.623
Argument of Peri:      321.58780 +/-     1.708
Long of Asc Node:       50.27964 +/-     0.000
Inclination:            18.19802 +/-     0.001
Eccentricity:         0.01944282 +/-    0.0005
Semi-Major Axis:     41.40697141 +/-    0.0029
Time of Perihelion: 2447171.4766 +/-     438.8
Perihelion:          40.60190308 +/-    0.0208
Aphelion:            42.21203975 +/-    0.0208
Period (y)              266.4516 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           25.88189163 +/-    0.0006
Ecliptic Y           31.50495730 +/-    0.0008
Ecliptic Z            0.07407448 +/-    0.0000
Ecliptic XDOT        -0.00197277 +/-    0.0000
Ecliptic YDOT         0.00166078 +/-    0.0000
Ecliptic ZDOT         0.00084774 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.77303197 +/-    0.0007
Geocenter to KBO     40.37569428 +/-    0.0010
# Hcoef:  8.49

The following table shows the complete astrometric record for 15VS170. 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 (15VS170) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.62902  03 17 49.649  +18 20 37.40  24.9w 15VS170   568  C~2nw6      
2015 09  12.49264  03 17 41.082  +18 20 27.15  25.0w 15VS170   568  C~2nw6      
2015 10  07.53854  03 16 24.715  +18 17 31.83  24.6w 15VS170   568  C~2nw6      
2015 10  07.59790  03 16 24.470  +18 17 31.16  24.5w 15VS170   568  C~2nw6      
2015 10  09.57780  03 16 16.428  +18 17 09.55  25.0w 15VS170   568  C~2nw6      
2015 11  07.33264  03 13 58.374  +18 10 28.59  24.8r 15VS170   568  C~2nw6      
2015 11  07.37479  03 13 58.141  +18 10 27.87  24.6r 15VS170   568  C~2nw6      
2015 11  07.41697  03 13 57.917  +18 10 27.34  24.5r 15VS170   568  C~2nw6      
2015 11  10.49950  03 13 41.707  +18 09 38.16  24.6w 15VS170   568  C~2nw6      
2015 11  17.34635  03 13 05.624  +18 07 48.36  24.7w 15VS170   568  C~2nw6      
2015 11  17.39294  03 13 05.377  +18 07 47.58  24.8w 15VS170   568  C~2nw6      
2015 12  06.35508  03 11 29.260  +18 02 54.55  24.6w 15VS170   568  C~2nw6      
2016 01  01.34294  03 09 45.302  +17 57 54.11  25.0w 15VS170   568  C~2nw6      
2016 01  07.40549  03 09 28.248  +17 57 11.73  24.7w 15VS170   568  C~2nw6      
2016 01  08.25043  03 09 26.167  +17 57 06.79  25.1w 15VS170   568  C~2nw6      
2016 02  05.28189  03 08 55.455  +17 56 58.42  24.5w 15VS170   568  C~2nw6      
2016 02  10.30227  03 08 58.413  +17 57 30.27  24.6w 15VS170   568  C~2nw6      
2016 11  02.53154  03 19 21.270  +18 58 27.14        15VS170   568  C~2nw7      
2016 11  04.40663  03 19 11.523  +18 57 59.31        15VS170   568  C~2nw7      
2016 12  24.30698  03 15 08.278  +18 46 03.69  24.8w 15VS170   568  C~2nw7      
2017 01  02.40920  03 14 37.281  +18 44 37.87  24.8w 15VS170   568  C~2nw7      
2017 01  26.29981  03 13 51.261  +18 43 02.65  25.5w 15VS170   568  C~2nw7      
2017 09  15.60695  03 27 34.260  +19 51 46.77  24.9w 15VS170   568  C~2nw7      
2017 09  22.59291  03 27 17.240  +19 51 26.62  24.8w 15VS170   568  C~2nw7      
2017 12  16.36391  03 20 43.110  +19 34 13.66  24.7w 15VS170   568  C~2nw7      

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    -0.05       0.00     0.00
     2   0.0133   -120.48     0.08      21.65    -0.12
     3   0.0819  -1216.19    -0.05     134.64    -0.01
     4   0.0821  -1219.73    -0.10     134.91    -0.03
     5   0.0875  -1335.95    -0.05     143.88     0.01
     6   0.1662  -3339.42     0.17     272.56     0.02
     7   0.1663  -3342.81     0.03     272.74    -0.01
     8   0.1664  -3346.03     0.07     273.07     0.12
     9   0.1749  -3581.92    -0.04     286.59    -0.03
    10   0.1936  -4107.16     0.01     316.70     0.02
    11   0.1937  -4110.76     0.03     316.88    -0.02
    12   0.2457  -5510.61    -0.04     398.80    -0.01
    13   0.3168  -7021.27     0.14     506.93    -0.08
    14   0.3334  -7267.34    -0.25     531.69     0.13
    15   0.3357  -7297.30     0.02     534.94     0.00
    16   0.4125  -7722.12     0.01     645.26     0.07
    17   0.4262  -7672.81     0.04     664.53     0.03
    18   1.1551   1842.80     0.11    1857.94    -0.09
    19   1.1602   1702.01    -0.03    1866.52    -0.02
    20   1.2969  -1818.31    -0.03    2071.23    -0.04
    21   1.3218  -2265.73    -0.12    2104.02     0.08
    22   1.3872  -2921.61     0.03    2184.40    -0.07
    23   2.0232   9403.78     0.04    3207.91    -0.01
    24   2.0423   9165.56    -0.10    3247.24     0.16
    25   2.2744   3512.28     0.07    3637.67    -0.09

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.

15VS170    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        41.787    41.799    41.776
ecceobj         0.029     0.030     0.028
incobj         18.127    18.127    18.127
qmin           39.980    39.985    40.001
qmax           43.162    43.169    43.108
amean          41.491    41.502    41.481
amin           41.187    41.187    41.176
amax           41.807    41.817    41.795
emean           0.021     0.022     0.020
emin            0.010     0.011     0.009
emax            0.033     0.033     0.032
imean          16.880    16.882    16.879
imin           16.233    16.241    16.231
imax           17.462    17.461    17.462
excite_mean     0.291     0.291     0.291
fracstop        1.000     1.000     1.000
cjmean          2.971     2.971     2.971

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       177.8     178.5     177.5
kozaiamp        180.0     180.0     179.9