Orbit Fit and Astrometric record for 15VB171

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: 15VB171   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting     31 observations of     31
# Arc:   2.28y
# First observation: 2015/09/06
#  Last observation: 2017/12/16
Preliminary a, adot, b, bdot, g, gdot:
  -0.000094   0.019106  -0.000002   0.000673   0.021527   0.000000
# Chi-squared of fit:     5.35 DOF:     56 RMS:  0.07
# Min/Max residuals:    -0.17    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.351751E-05  1.898616E-02  7.598385E-07  6.698495E-04  2.149923E-02  1.066685E-03
# Covariance matrix:
  2.4253E-13  2.1643E-14  5.6060E-16  4.4607E-15  2.0414E-13  3.8990E-12
  2.1643E-14  2.7598E-13 -6.2111E-16  9.4221E-15  2.1519E-13  7.9106E-12
  5.6060E-16 -6.2111E-16  1.0712E-13 -7.2521E-14  2.4475E-16 -2.6452E-14
  4.4607E-15  9.4221E-15 -7.2521E-14  8.7607E-14  1.0479E-14  3.9481E-13
  2.0414E-13  2.1519E-13  2.4475E-16  1.0479E-14  3.5126E-13  8.9662E-12
  3.8990E-12  7.9106E-12 -2.6452E-14  3.9481E-13  8.9662E-12  3.3140E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.329393   51.253015    0.935423   -0.008767   -0.384158  2457272.124289
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          152.87694 +/-     0.595
Argument of Peri:      169.82101 +/-     0.594
Long of Asc Node:       83.59564 +/-     0.012
Inclination:             2.38860 +/-     0.001
Eccentricity:         0.07905214 +/-    0.0003
Semi-Major Axis:     43.77273768 +/-    0.0034
Time of Perihelion: 2412350.1144 +/-     174.7
Perihelion:          40.31240891 +/-    0.0153
Aphelion:            47.23306645 +/-    0.0154
Period (y)              289.6101 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           30.07001297 +/-    0.0008
Ecliptic Y           35.98076073 +/-    0.0010
Ecliptic Z           -1.07907398 +/-    0.0000
Ecliptic XDOT        -0.00180134 +/-    0.0000
Ecliptic YDOT         0.00161431 +/-    0.0000
Ecliptic ZDOT         0.00008218 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   46.90400008 +/-    0.0009
Geocenter to KBO     46.51330021 +/-    0.0013
# Hcoef:  7.65

The following table shows the complete astrometric record for 15VB171. 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 (15VB171) followed by the observatory code and reference code for the source of the astrometry.

2015 09  06.62350  03 16 45.180  +16 47 23.86  24.8w 15VB171   568  C~2nw8      
2015 09  12.51312  03 16 36.410  +16 46 42.62  24.4w 15VB171   568  C~2nw8      
2015 10  07.54436  03 15 30.685  +16 42 02.96  24.6w 15VB171   568  C~2nw8      
2015 10  07.60373  03 15 30.483  +16 42 02.18  24.6w 15VB171   568  C~2nw8      
2015 10  09.58362  03 15 23.569  +16 41 33.80  24.6w 15VB171   568  C~2nw8      
2015 11  07.33788  03 13 25.228  +16 33 43.22  24.5r 15VB171   568  C~2nw8      
2015 11  07.38006  03 13 25.027  +16 33 42.54  24.6r 15VB171   568  C~2nw8      
2015 11  07.42224  03 13 24.840  +16 33 41.81  24.2r 15VB171   568  C~2nw8      
2015 11  10.50536  03 13 10.950  +16 32 47.95  24.7w 15VB171   568  C~2nw8      
2015 11  17.35218  03 12 40.061  +16 30 48.79  24.4w 15VB171   568  C~2nw8      
2015 11  17.39878  03 12 39.843  +16 30 47.90  24.5w 15VB171   568  C~2nw8      
2015 12  06.36096  03 11 17.625  +16 25 37.57  24.6w 15VB171   568  C~2nw8      
2015 12  06.49848  03 11 17.049  +16 25 35.62  24.2w 15VB171   568  C~2nw8      
2016 01  01.34872  03 09 48.719  +16 20 21.20  25.0w 15VB171   568  C~2nw8      
2016 02  05.28768  03 09 06.323  +16 18 42.68  24.5w 15VB171   568  C~2nw8      
2016 02  10.30807  03 09 08.933  +16 19 04.19  24.4w 15VB171   568  C~2nw8      
2016 09  26.59656  03 20 24.759  +17 03 24.93  24.7w 15VB171   568  C~2nw8      
2016 10  10.40230  03 19 40.866  +17 00 27.64  24.4w 15VB171   568  C~2nw8      
2016 10  10.46065  03 19 40.650  +17 00 26.84  25.2w 15VB171   568  C~2nw8      
2016 10  27.49100  03 18 33.101  +16 56 03.01  24.6w 15VB171   568  C~2nw8      
2016 12  24.29598  03 14 31.154  +16 41 11.64  24.3w 15VB171   568  C~2nw8      
2016 12  24.31334  03 14 31.099  +16 41 11.36  24.6w 15VB171   568  C~2nw8      
2017 01  02.39822  03 14 04.815  +16 39 43.81  24.2w 15VB171   568  C~2nw8      
2017 01  02.41556  03 14 04.779  +16 39 43.64  24.1w 15VB171   568  C~2nw8      
2017 01  26.32220  03 13 25.879  +16 37 57.93  24.6w 15VB171   568  C~2nw8      
2017 01  26.32908  03 13 25.864  +16 37 58.03  25.0w 15VB171   568  C~2nw8      
2017 09  17.60038  03 25 08.812  +17 23 39.33  24.4w 15VB171   568  C~2nw8      
2017 09  23.57901  03 24 55.498  +17 22 44.15        15VB171   568  C~2nw8      
2017 09  23.58734  03 24 55.470  +17 22 44.15  24.7w 15VB171   568  C~2nw8      
2017 09  24.59522  03 24 52.975  +17 22 33.91  24.8w 15VB171   568  C~2nw8      
2017 12  16.39181  03 19 21.574  +17 02 04.95  24.5w 15VB171   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     0.09       0.00    -0.06
     2   0.0161   -132.34    -0.05      -7.06    -0.01
     3   0.0847  -1116.71    -0.08     -30.73     0.02
     4   0.0848  -1119.72     0.02     -30.72     0.06
     5   0.0902  -1223.02    -0.07     -32.12    -0.03
     6   0.1690  -2987.99     0.21     -39.01    -0.02
     7   0.1691  -2990.96     0.10     -38.90     0.06
     8   0.1692  -2993.74     0.18     -38.90     0.04
     9   0.1776  -3200.64    -0.01     -38.07     0.09
    10   0.1964  -3660.65    -0.08     -35.42     0.03
    11   0.1965  -3663.91    -0.17     -35.45    -0.04
    12   0.2484  -4887.05    -0.08     -20.26    -0.11
    13   0.2488  -4895.56    -0.13     -19.93     0.05
    14   0.3196  -6205.45     0.03      17.16     0.00
    15   0.4152  -6820.38     0.02      86.34     0.01
    16   0.4290  -6778.36     0.05      96.95    -0.00
    17   1.0567   3292.58    -0.07     116.22     0.01
    18   1.0945   2638.52     0.04     106.00    -0.11
    19   1.0947   2635.32     0.00     106.02    -0.08
    20   1.1413   1630.84     0.02     100.28    -0.00
    21   1.2996  -1955.63    -0.05     143.98     0.13
    22   1.2996  -1956.46    -0.05     143.92     0.03
    23   1.3245  -2343.92    -0.05     158.80    -0.01
    24   1.3246  -2344.46     0.08     158.77    -0.07
    25   1.3900  -2911.69     0.08     204.21    -0.12
    26   1.3900  -2911.87    -0.03     204.37     0.02
    27   2.0314   7540.11     0.03     263.31     0.09
    28   2.0478   7341.52    -0.00     257.48    -0.08
    29   2.0478   7341.14    -0.08     257.58     0.03
    30   2.0506   7303.95     0.06     256.59    -0.07
    31   2.2773   2396.02     0.01     271.08     0.11

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.

15VB171    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.177    44.189    44.165
ecceobj         0.073     0.074     0.073
incobj          2.386     2.386     2.386
qmin           39.901    39.882    39.893
qmax           48.151    48.152    48.083
amean          43.883    43.894    43.872
amin           43.538    43.544    43.519
amax           44.250    44.258    44.242
emean           0.070     0.070     0.069
emin            0.053     0.053     0.052
emax            0.088     0.088     0.087
imean           0.766     0.765     0.767
imin            0.215     0.212     0.216
imax            1.156     1.156     1.157
excite_mean     0.071     0.072     0.071
fracstop        1.000     1.000     1.000
cjmean          3.094     3.094     3.094

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       182.2     181.8     182.4
kozaiamp        180.0     179.9     180.0