Orbit Fit and Astrometric record for 15VH171

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: 15VH171   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting     28 observations of     28
# Arc:   2.27y
# First observation: 2015/09/07
#  Last observation: 2017/12/13
Preliminary a, adot, b, bdot, g, gdot:
  -0.000150   0.024982  -0.000003   0.001023   0.024475   0.000000
# Chi-squared of fit:     3.55 DOF:     50 RMS:  0.06
# Min/Max residuals:    -0.19    0.13
# Exact a, adot, b, bdot, g, gdot:
  1.624488E-05  2.476836E-02  7.083949E-07  1.011449E-03  2.442747E-02 -9.473930E-04
# Covariance matrix:
  2.9017E-13  2.9702E-14 -5.4467E-16  6.0526E-15  2.1957E-13  3.2037E-12
  2.9702E-14  3.4300E-13 -4.0070E-15  2.0031E-14  2.3451E-13  1.0450E-11
 -5.4467E-16 -4.0070E-15  1.1112E-13 -8.5023E-14 -2.9762E-15 -2.1532E-13
  6.0526E-15  2.0031E-14 -8.5023E-14  1.2238E-13  1.7619E-14  1.0166E-12
  2.1957E-13  2.3451E-13 -2.9762E-15  1.7619E-14  3.2868E-13  9.2299E-12
  3.2037E-12  1.0450E-11 -2.1532E-13  1.0166E-12  9.2299E-12  5.2953E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.818356   51.950682    0.933334   -0.005403   -0.388689  2457273.133899
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          324.81988 +/-     0.332
Argument of Peri:       23.28581 +/-     0.434
Long of Asc Node:       69.87131 +/-     0.006
Inclination:             2.46176 +/-     0.001
Eccentricity:         0.10016400 +/-    0.0007
Semi-Major Axis:     44.83564817 +/-    0.0062
Time of Perihelion: 2467986.3929 +/-     101.0
Perihelion:          40.34473027 +/-    0.0298
Aphelion:            49.32656607 +/-    0.0301
Period (y)              300.2226 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           26.19931168 +/-    0.0006
Ecliptic Y           31.96485325 +/-    0.0007
Ecliptic Z           -0.58465468 +/-    0.0000
Ecliptic XDOT        -0.00225240 +/-    0.0000
Ecliptic YDOT         0.00162224 +/-    0.0000
Ecliptic ZDOT         0.00011492 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.33397630 +/-    0.0007
Geocenter to KBO     40.93752191 +/-    0.0010
# Hcoef:  7.66

The following table shows the complete astrometric record for 15VH171. 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 (15VH171) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.63311  03 19 01.224  +17 27 50.26  24.2w 15VH171   568  C~2nw9      
2015 09  12.49674  03 18 53.585  +17 27 18.44  24.2w 15VH171   568  C~2nw9      
2015 10  09.58362  03 17 34.748  +17 22 07.49  24.3w 15VH171   568  C~2nw9      
2015 11  07.33788  03 15 23.455  +17 13 44.64  23.5r 15VH171   568  C~2nw9      
2015 11  07.38006  03 15 23.243  +17 13 43.86  23.8r 15VH171   568  C~2nw9      
2015 11  07.42224  03 15 23.021  +17 13 43.04  23.8r 15VH171   568  C~2nw9      
2015 11  10.50536  03 15 07.539  +17 12 44.41  23.7w 15VH171   568  C~2nw9      
2015 11  17.35218  03 14 33.034  +17 10 34.05  24.2w 15VH171   568  C~2nw9      
2015 11  17.39878  03 14 32.793  +17 10 33.19  23.9w 15VH171   568  C~2nw9      
2015 12  06.36096  03 13 00.833  +17 04 49.76  24.0w 15VH171   568  C~2nw9      
2015 12  06.49848  03 13 00.186  +17 04 47.51  24.0w 15VH171   568  C~2nw9      
2016 01  01.34872  03 11 21.629  +16 58 52.85  24.2w 15VH171   568  C~2nw9      
2016 01  07.41130  03 11 05.519  +16 57 58.45  24.0w 15VH171   568  C~2nw9      
2016 01  07.42868  03 11 05.495  +16 57 58.46  24.2w 15VH171   568  C~2nw9      
2016 01  08.25624  03 11 03.550  +16 57 52.22  24.1w 15VH171   568  C~2nw9      
2016 02  05.28768  03 10 36.047  +16 56 52.10  24.0w 15VH171   568  C~2nw9      
2016 02  10.30807  03 10 39.395  +16 57 14.64  24.2w 15VH171   568  C~2nw9      
2016 09  07.62568  03 24 42.309  +17 52 42.55        15VH171   568  C~2nw9      
2016 11  02.52573  03 21 29.596  +17 40 39.83  24.1w 15VH171   568  C~2nw9      
2016 11  04.40084  03 21 20.315  +17 40 05.69  23.9w 15VH171   568  C~2nw9      
2016 12  24.31334  03 17 27.463  +17 26 08.04        15VH171   568  C~2nw9      
2016 12  25.28177  03 17 24.026  +17 25 56.16  24.0w 15VH171   568  C~2nw9      
2016 12  28.42845  03 17 13.300  +17 25 19.36  24.0w 15VH171   568  C~2nw9      
2017 01  02.41556  03 16 57.872  +17 24 27.51  24.0w 15VH171   568  C~2nw9      
2017 01  26.32908  03 16 14.609  +17 22 19.70  23.9w 15VH171   568  C~2nw9      
2017 01  26.34230  03 16 14.606  +17 22 19.61  24.1w 15VH171   568  C~2nw9      
2017 12  13.39064  03 23 57.950  +17 54 03.47  23.9w 15VH171   568  C~2nw9      
2017 12  13.42791  03 23 57.781  +17 54 02.87  24.0w 15VH171   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    -0.04       0.00    -0.01
     2   0.0133   -113.81    -0.01      -2.65    -0.02
     3   0.0875  -1284.22    -0.08     -11.95     0.03
     4   0.1662  -3230.85     0.10      -8.21     0.03
     5   0.1663  -3233.99     0.13      -8.17     0.03
     6   0.1664  -3237.27     0.03      -8.13     0.04
     7   0.1749  -3466.77     0.07      -6.66     0.04
     8   0.1936  -3978.26    -0.01      -2.78     0.00
     9   0.1937  -3981.82    -0.03      -2.70     0.03
    10   0.2457  -5344.65     0.02      13.47    -0.07
    11   0.2460  -5354.20    -0.09      13.75     0.05
    12   0.3168  -6812.43    -0.01      47.21    -0.00
    13   0.3334  -7049.95    -0.19      56.43    -0.15
    14   0.3335  -7050.28     0.11      56.54    -0.07
    15   0.3357  -7078.88     0.03      57.97     0.08
    16   0.4125  -7475.70     0.07     105.52    -0.03
    17   0.4262  -7423.31    -0.09     114.39     0.02
    18   1.0020   5094.91    -0.04     208.41    -0.03
    19   1.1551   2248.02     0.02     202.07     0.01
    20   1.1602   2111.04     0.05     202.73    -0.01
    21   1.2969  -1322.66    -0.05     247.40     0.08
    22   1.2995  -1373.25     0.02     248.67     0.05
    23   1.3081  -1531.05     0.07     252.91    -0.07
    24   1.3218  -1757.77    -0.14     260.13     0.02
    25   1.3873  -2389.05     0.01     297.77     0.03
    26   1.3873  -2389.11     0.08     297.70    -0.07
    27   2.2663   4501.76     0.02     445.24     0.02
    28   2.2664   4499.28    -0.02     445.26    -0.01

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.

15VH171    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.281    45.293    45.270
ecceobj         0.104     0.105     0.103
incobj          2.457     2.457     2.457
qmin           39.343    39.291    39.360
qmax           50.786    50.819    50.736
amean          44.910    44.917    44.895
amin           44.548    44.539    44.536
amax           45.309    45.320    45.306
emean           0.105     0.106     0.105
emin            0.091     0.092     0.089
emax            0.121     0.122     0.120
imean           1.196     1.207     1.201
imin            0.414     0.415     0.415
imax            1.775     1.803     1.788
excite_mean     0.108     0.109     0.107
fracstop        1.000     1.000     1.000
cjmean          3.098     3.098     3.098

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       159.7     158.8     159.0
kozaiamp        180.0     180.0     180.0