Orbit Fit and Astrometric record for 15VQ202

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: 15VQ202   
# Created Tue Apr  1 01:10:43 2025
# Orbit generated from Bernstein formalism
# Fitting     21 observations of     21
# Arc:   1.44y
# First observation: 2015/08/20
#  Last observation: 2017/01/27
Preliminary a, adot, b, bdot, g, gdot:
  -0.000114   0.022326   0.000001   0.000936   0.023228   0.000000
# Chi-squared of fit:     6.04 DOF:     36 RMS:  0.09
# Min/Max residuals:    -0.26    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.483112E-05  2.197372E-02  2.336660E-07  9.252963E-04  2.300474E-02  3.122909E-04
# Covariance matrix:
  3.8417E-13  7.2369E-14 -5.4020E-15  2.5800E-14  4.1211E-13  1.8970E-11
  7.2369E-14  6.8073E-13 -8.4498E-15  4.2152E-14  5.1054E-13  3.0968E-11
 -5.4020E-15 -8.4498E-15  1.5505E-13 -1.6930E-13 -1.1838E-14 -7.4861E-13
  2.5800E-14  4.2152E-14 -1.6930E-13  3.3139E-13  5.7911E-14  3.7703E-12
  4.1211E-13  5.1054E-13 -1.1838E-14  5.7911E-14  8.0037E-13  4.2561E-11
  1.8970E-11  3.0968E-11 -7.4861E-13  3.7703E-12  4.2561E-11  2.7694E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.193214   54.475417    1.013517    0.000289   -0.046935  2457255.041279
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:          299.42815 +/-     4.964
Argument of Peri:       66.42835 +/-     5.236
Long of Asc Node:       48.58675 +/-     0.003
Inclination:             2.42701 +/-     0.001
Eccentricity:         0.01301619 +/-    0.0021
Semi-Major Axis:     43.80004754 +/-    0.0037
Time of Perihelion: 2475065.2051 +/-    1460.0
Perihelion:          43.22993776 +/-    0.0919
Aphelion:            44.37015731 +/-    0.0919
Period (y)              289.8812 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           26.10586349 +/-    0.0010
Ecliptic Y           34.82714454 +/-    0.0014
Ecliptic Z            0.14662270 +/-    0.0000
Ecliptic XDOT        -0.00210899 +/-    0.0000
Ecliptic YDOT         0.00154311 +/-    0.0000
Ecliptic ZDOT         0.00011030 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.52548223 +/-    0.0012
Geocenter to KBO     43.46929770 +/-    0.0017
# Hcoef:  8.32

The following table shows the complete astrometric record for 15VQ202. 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 (15VQ202) followed by the observatory code and reference code for the source of the astrometry.

2015 08  20.54049  03 28 14.811  +19 04 35.23  25.2w 15VQ202   568  C~4nAh      
2015 09  07.59637  03 28 09.165  +19 04 29.80  24.8w 15VQ202   568  C~4nAh      
2015 09  12.44325  03 28 02.595  +19 04 09.93  24.8w 15VQ202   568  C~4nAh      
2015 10  09.53094  03 26 50.126  +19 00 11.05  24.9w 15VQ202   568  C~4nAh      
2015 11  06.30734  03 24 49.727  +18 53 12.65  24.9r 15VQ202   568  C~4nAh      
2015 11  06.37060  03 24 49.420  +18 53 11.57  24.8r 15VQ202   568  C~4nAh      
2015 11  06.44142  03 24 49.068  +18 53 10.33  24.8r 15VQ202   568  C~4nAh      
2015 11  07.46098  03 24 44.151  +18 52 52.97  25.1w 15VQ202   568  C~4nAh      
2015 11  17.48946  03 23 55.221  +18 49 59.68        15VQ202   568  C~4nAh      
2015 12  06.30809  03 22 25.639  +18 44 38.34  24.5w 15VQ202   568  C~4nAh      
2015 12  06.43481  03 22 25.035  +18 44 36.22  25.3w 15VQ202   568  C~4nAh      
2015 12  31.32982  03 20 48.385  +18 38 45.34  25.1w 15VQ202   568  C~4nAh      
2016 01  07.35914  03 20 28.507  +18 37 32.94  24.7w 15VQ202   568  C~4nAh      
2016 02  05.30505  03 19 52.496  +18 35 25.00  24.4w 15VQ202   568  C~4nAh      
2016 02  11.25843  03 19 54.981  +18 35 35.30  25.1w 15VQ202   568  C~4nAh      
2016 09  07.61990  03 33 17.388  +19 25 53.01  24.9w 15VQ202   568  C~4nAh      
2016 09  27.54346  03 32 38.104  +19 23 54.05  25.0w 15VQ202   568  C~4nAh      
2016 10  09.53944  03 31 59.299  +19 21 48.66  25.0w 15VQ202   568  C~4nAh      
2016 10  09.61149  03 31 59.040  +19 21 47.77  24.9w 15VQ202   568  C~4nAh      
2016 12  29.39711  03 26 01.851  +19 01 20.18  24.8w 15VQ202   568  C~4nAh      
2017 01  27.32921  03 25 01.107  +18 57 45.01  25.1w 15VQ202   568  C~4nAh      

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     0.08
     2   0.0494    -78.94     0.00      14.31    -0.01
     3   0.0627   -174.11     0.10      17.85    -0.25
     4   0.1369  -1228.90    -0.11      38.74     0.10
     5   0.2129  -2987.65     0.02      56.83    -0.00
     6   0.2131  -2992.14     0.04      56.87    -0.03
     7   0.2133  -2997.29    -0.05      56.91    -0.05
     8   0.2161  -3069.22    -0.07      57.50    -0.07
     9   0.2435  -3785.24    -0.02      63.32     0.12
    10   0.2951  -5097.91     0.04      72.27     0.09
    11   0.2954  -5106.75    -0.26      72.39     0.11
    12   0.3636  -6525.23     0.10      81.30    -0.04
    13   0.3828  -6817.20    -0.06      83.33    -0.09
    14   0.4621  -7345.44     0.21      90.48     0.17
    15   0.4784  -7308.61     0.01      91.40    -0.13
    16   1.0516   4467.14    -0.05     207.28     0.04
    17   1.1061   3898.81    -0.01     223.99     0.05
    18   1.1389   3335.49    -0.01     233.40     0.00
    19   1.1391   3331.71     0.12     233.41    -0.05
    20   1.3603  -1875.26     0.00     274.88     0.03
    21   1.4395  -2763.38    -0.06     280.39    -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.

15VQ202    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.205    44.220    44.192
ecceobj         0.016     0.015     0.017
incobj          2.417     2.417     2.418
qmin           42.216    42.316    42.069
qmax           45.696    45.601    45.801
amean          43.875    43.888    43.862
amin           43.539    43.556    43.523
amax           44.219    44.227    44.203
emean           0.019     0.017     0.021
emin            0.002     0.000     0.004
emax            0.034     0.031     0.036
imean           1.618     1.615     1.620
imin            0.858     0.864     0.854
imax            2.161     2.146     2.173
excite_mean     0.035     0.034     0.037
fracstop        1.000     1.000     1.000
cjmean          3.098     3.099     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     157.2     160.2
kozaiamp        179.9     180.0     179.9