Orbit Fit and Astrometric record for 15VS171

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: 15VS171   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting     29 observations of     29
# Arc:   2.35y
# First observation: 2015/08/11
#  Last observation: 2017/12/16
Preliminary a, adot, b, bdot, g, gdot:
  -0.000113   0.021380  -0.000004   0.000943   0.022739   0.000000
# Chi-squared of fit:     4.47 DOF:     52 RMS:  0.07
# Min/Max residuals:    -0.23    0.15
# Exact a, adot, b, bdot, g, gdot:
  1.470787E-05  2.101821E-02 -5.819622E-08  9.297361E-04  2.248764E-02  2.099379E-03
# Covariance matrix:
  2.2643E-13  2.4017E-14  1.4723E-15  7.6995E-15  1.9699E-13  5.9271E-12
  2.4017E-14  4.1522E-13 -1.3815E-15  2.2846E-14  3.0726E-13  1.7407E-11
  1.4723E-15 -1.3815E-15  1.0984E-13 -9.5065E-14  3.7973E-16 -1.4994E-13
  7.6995E-15  2.2846E-14 -9.5065E-14  1.5037E-13  2.3964E-14  1.5610E-12
  1.9699E-13  3.0726E-13  3.7973E-16  2.3964E-14  4.1047E-13  1.8316E-11
  5.9271E-12  1.7407E-11 -1.4994E-13  1.5610E-12  1.8316E-11  1.1876E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.578453   51.368058    1.014640    0.001513    0.050506  2457246.064839
# Heliocentric elements and errors
Epoch:              2457240.5000  =  2015/08/06
Mean Anomaly:           91.42960 +/-     0.291
Argument of Peri:      227.65709 +/-     0.255
Long of Asc Node:       82.41945 +/-     0.011
Inclination:             2.95018 +/-     0.001
Eccentricity:         0.07468169 +/-    0.0016
Semi-Major Axis:     44.09987279 +/-    0.0120
Time of Perihelion: 2430073.6831 +/-      85.8
Perihelion:          40.80641991 +/-    0.0706
Aphelion:            47.39332566 +/-    0.0709
Period (y)              292.8628 +/-      0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           28.50909158 +/-    0.0008
Ecliptic Y           34.05170390 +/-    0.0010
Ecliptic Z           -1.22489568 +/-    0.0000
Ecliptic XDOT        -0.00183958 +/-    0.0000
Ecliptic YDOT         0.00179327 +/-    0.0000
Ecliptic ZDOT         0.00010617 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.42732504 +/-    0.0009
Geocenter to KBO     44.46887560 +/-    0.0013
# Hcoef:  8.37

The following table shows the complete astrometric record for 15VS171. 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 (15VS171) followed by the observatory code and reference code for the source of the astrometry.

2015 08  11.56405  03 17 29.205  +16 34 45.45  24.6w 15VS171   568  C~2nwA      
2015 09  06.61072  03 17 26.286  +16 33 50.72  25.5w 15VS171   568  C~2nwA      
2015 09  12.50083  03 17 17.370  +16 33 07.35  25.2w 15VS171   568  C~2nwA      
2015 10  07.42237  03 16 09.794  +16 28 15.83  25.3w 15VS171   568  C~2nwA      
2015 10  08.43421  03 16 06.145  +16 28 00.79  25.0w 15VS171   568  C~2nwA      
2015 10  08.49327  03 16 05.933  +16 28 00.01  25.0w 15VS171   568  C~2nwA      
2015 11  07.34317  03 13 58.356  +16 19 32.87  24.8r 15VS171   568  C~2nwA      
2015 11  07.38533  03 13 58.142  +16 19 32.30  24.5r 15VS171   568  C~2nwA      
2015 11  07.42748  03 13 57.948  +16 19 31.49  24.9r 15VS171   568  C~2nwA      
2015 11  10.51130  03 13 43.427  +16 18 35.77  24.8w 15VS171   568  C~2nwA      
2015 11  17.35801  03 13 11.123  +16 16 32.29  25.1w 15VS171   568  C~2nwA      
2015 11  17.40462  03 13 10.889  +16 16 31.39  24.9w 15VS171   568  C~2nwA      
2015 12  06.36680  03 11 44.865  +16 11 11.80  25.1w 15VS171   568  C~2nwA      
2015 12  13.30120  03 11 16.351  +16 09 29.54  24.8w 15VS171   568  C~2nwA      
2015 12  13.35972  03 11 16.126  +16 09 28.68  25.0w 15VS171   568  C~2nwA      
2016 01  01.35451  03 10 12.029  +16 05 51.56  25.2w 15VS171   568  C~2nwA      
2016 01  07.30127  03 09 57.174  +16 05 06.37  24.9w 15VS171   568  C~2nwA      
2016 02  04.33458  03 09 28.267  +16 04 25.67  25.2w 15VS171   568  C~2nwA      
2016 02  11.22361  03 09 32.265  +16 05 01.13  25.2w 15VS171   568  C~2nwA      
2016 09  07.56206  03 22 14.319  +16 55 24.78        15VS171   568  C~2nwA      
2016 10  10.43747  03 20 48.868  +16 49 25.36  24.9w 15VS171   568  C~2nwA      
2016 10  10.49616  03 20 48.636  +16 49 24.51  25.2w 15VS171   568  C~2nwA      
2016 10  10.51394  03 20 48.565  +16 49 24.35  25.1w 15VS171   568  C~2nwA      
2016 11  02.51995  03 19 10.984  +16 43 06.55  24.9w 15VS171   568  C~2nwA      
2016 11  04.39506  03 19 02.297  +16 42 33.56  24.9w 15VS171   568  C~2nwA      
2016 12  24.33186  03 15 25.279  +16 29 34.96  25.5w 15VS171   568  C~2nwA      
2017 01  26.32220  03 14 17.395  +16 26 29.77  25.4w 15VS171   568  C~2nwA      
2017 01  27.28684  03 14 16.832  +16 26 30.17  25.0w 15VS171   568  C~2nwA      
2017 12  16.39181  03 20 46.839  +16 53 15.95        15VS171   568  C~2nwA      

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     0.15
     2   0.0713    -54.72     0.09     -41.99     0.05
     3   0.0874   -189.77    -0.06     -50.64     0.07
     4   0.1557  -1204.00     0.07     -79.43    -0.03
     5   0.1584  -1258.59    -0.11     -80.26    -0.06
     6   0.1586  -1261.74     0.00     -80.22     0.01
     7   0.2403  -3166.55     0.13     -88.58    -0.23
     8   0.2404  -3169.67    -0.00     -88.32     0.00
     9   0.2406  -3172.58     0.08     -88.37    -0.07
    10   0.2490  -3388.97     0.06     -87.05     0.13
    11   0.2677  -3870.32     0.10     -83.40     0.01
    12   0.2679  -3873.80    -0.07     -83.38    -0.02
    13   0.3198  -5153.75    -0.10     -63.12     0.04
    14   0.3388  -5577.22    -0.13     -52.33     0.06
    15   0.3389  -5580.57     0.01     -52.30    -0.02
    16   0.3909  -6529.44    -0.04     -14.81    -0.04
    17   0.4072  -6748.05     0.00      -0.98     0.02
    18   0.4840  -7160.80     0.04      71.64    -0.01
    19   0.5028  -7095.69    -0.03      90.33    -0.02
    20   1.0760   4276.66     0.02     148.64    -0.01
    21   1.1660   2998.61     0.05     112.82    -0.06
    22   1.1661   2995.17    -0.07     112.85    -0.01
    23   1.1662   2994.14    -0.09     112.96     0.10
    24   1.2292   1542.49    -0.07     106.62     0.01
    25   1.2343   1413.39    -0.06     106.84    -0.08
    26   1.3710  -1801.43     0.05     164.17     0.02
    27   1.4614  -2792.44     0.01     241.57    -0.05
    28   1.4640  -2800.15     0.02     244.08    -0.03
    29   2.3486   3029.27     0.07     343.24     0.08

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.

15VS171    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.541    44.582    44.501
ecceobj         0.079     0.083     0.075
incobj          2.947     2.947     2.947
qmin           40.074    39.982    40.267
qmax           48.508    48.809    48.252
amean          44.202    44.242    44.164
amin           43.847    43.882    43.815
amax           44.572    44.624    44.529
emean           0.073     0.077     0.069
emin            0.057     0.061     0.052
emax            0.089     0.094     0.084
imean           1.188     1.183     1.193
imin            0.425     0.414     0.433
imax            1.735     1.731     1.740
excite_mean     0.076     0.080     0.072
fracstop        1.000     1.000     1.000
cjmean          3.097     3.097     3.097

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       189.2     188.8     188.9
kozaiamp        179.9     180.0     180.0