Orbit Fit and Astrometric record for 15VZ169

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: 15VZ169   
# Created Tue Apr  1 01:10:40 2025
# Orbit generated from Bernstein formalism
# Fitting     31 observations of     31
# Arc:   2.08y
# First observation: 2015/08/20
#  Last observation: 2017/09/16
Preliminary a, adot, b, bdot, g, gdot:
  -0.000094   0.019402  -0.000004   0.000023   0.021480   0.000000
# Chi-squared of fit:     7.82 DOF:     56 RMS:  0.09
# Min/Max residuals:    -0.21    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.482832E-05  1.909170E-02 -5.009829E-07  2.264390E-05  2.128443E-02 -1.065229E-03
# Covariance matrix:
  2.1705E-13 -4.7852E-14  2.8879E-15 -1.0456E-15  1.5304E-13  2.9463E-12
 -4.7852E-14  3.7594E-13  3.1562E-15 -3.8164E-15  1.7845E-13  1.1200E-11
  2.8879E-15  3.1562E-15  1.0303E-13 -9.7434E-14  5.0082E-15  1.7508E-13
 -1.0456E-15 -3.8164E-15 -9.7434E-14  1.6670E-13 -3.4080E-15 -2.0462E-13
  1.5304E-13  1.7845E-13  5.0082E-15 -3.4080E-15  2.7208E-13  9.8692E-12
  2.9463E-12  1.1200E-11  1.7508E-13 -2.0462E-13  9.8692E-12  6.0015E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.685930   54.173707    1.013237   -0.001414   -0.052517  2457255.056669
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:          248.12729 +/-     0.398
Argument of Peri:       31.89252 +/-     0.384
Long of Asc Node:      141.95647 +/-     0.042
Inclination:             1.68400 +/-     0.000
Eccentricity:         0.08897512 +/-    0.0011
Semi-Major Axis:     45.25187313 +/-    0.0082
Time of Perihelion: 2491802.6377 +/-     122.7
Perihelion:          41.22558239 +/-    0.0492
Aphelion:            49.27816388 +/-    0.0495
Period (y)              304.4129 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           28.33664727 +/-    0.0007
Ecliptic Y           37.52627258 +/-    0.0009
Ecliptic Z           -1.38226820 +/-    0.0000
Ecliptic XDOT        -0.00207326 +/-    0.0000
Ecliptic YDOT         0.00132010 +/-    0.0000
Ecliptic ZDOT         0.00000700 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   47.04356893 +/-    0.0008
Geocenter to KBO     46.98270419 +/-    0.0012
# Hcoef:  7.75

The following table shows the complete astrometric record for 15VZ169. 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 (15VZ169) followed by the observatory code and reference code for the source of the astrometry.

2015 08  20.55588  03 28 56.778  +17 10 49.86  24.6w 15VZ169   568  C~2nw4      
2015 09  07.60452  03 28 51.156  +17 09 49.82  24.5w 15VZ169   568  C~2nw4      
2015 09  12.45550  03 28 45.018  +17 09 17.26  24.5w 15VZ169   568  C~2nw4      
2015 10  07.50351  03 27 44.750  +17 04 54.21  24.3w 15VZ169   568  C~2nw4      
2015 10  07.56195  03 27 44.555  +17 04 53.42  24.8w 15VZ169   568  C~2nw4      
2015 10  09.54258  03 27 37.989  +17 04 26.71  24.6w 15VZ169   568  C~2nw4      
2015 11  06.31779  03 25 46.988  +16 57 15.60  24.2r 15VZ169   568  C~2nw4      
2015 11  06.38117  03 25 46.718  +16 57 14.44  24.5r 15VZ169   568  C~2nw4      
2015 11  06.45191  03 25 46.387  +16 57 13.27  25.0r 15VZ169   568  C~2nw4      
2015 11  06.46851  03 25 46.316  +16 57 13.07  24.2r 15VZ169   568  C~2nw4      
2015 11  07.47269  03 25 41.853  +16 56 56.42  24.6w 15VZ169   568  C~2nw4      
2015 11  17.45383  03 24 56.942  +16 54 09.80  24.6w 15VZ169   568  C~2nw4      
2015 11  17.54213  03 24 56.532  +16 54 08.23  25.0w 15VZ169   568  C~2nw4      
2015 12  06.32006  03 23 33.956  +16 49 11.46  24.6w 15VZ169   568  C~2nw4      
2015 12  06.45375  03 23 33.379  +16 49 09.23  24.5w 15VZ169   568  C~2nw4      
2015 12  31.34139  03 22 03.605  +16 44 06.85  24.6w 15VZ169   568  C~2nw4      
2016 01  07.37071  03 21 44.977  +16 43 10.06  24.9w 15VZ169   568  C~2nw4      
2016 01  08.23304  03 21 42.984  +16 43 03.97  24.8w 15VZ169   568  C~2nw4      
2016 02  05.31732  03 21 10.098  +16 42 01.36  24.6w 15VZ169   568  C~2nw4      
2016 02  05.32390  03 21 10.106  +16 42 01.24  25.0w 15VZ169   568  C~2nw4      
2016 02  11.27002  03 21 11.981  +16 42 22.22  24.7w 15VZ169   568  C~2nw4      
2016 09  27.53124  03 32 42.147  +17 22 56.81  24.6w 15VZ169   568  C~2nw4      
2016 10  07.52165  03 32 12.839  +17 20 57.30  24.7w 15VZ169   568  C~2nw4      
2016 10  07.61708  03 32 12.517  +17 20 56.22  24.7w 15VZ169   568  C~2nw4      
2016 10  09.52198  03 32 06.225  +17 20 31.06  25.1w 15VZ169   568  C~2nw4      
2016 10  09.59415  03 32 05.973  +17 20 29.87  25.1w 15VZ169   568  C~2nw4      
2016 11  02.47368  03 30 31.927  +17 14 32.50  24.7w 15VZ169   568  C~2nw4      
2016 11  04.44969  03 30 23.253  +17 14 00.57  24.6w 15VZ169   568  C~2nw4      
2016 12  24.35704  03 26 52.067  +17 01 47.06        15VZ169   568  C~2nw4      
2017 01  27.32464  03 25 38.726  +16 58 25.11  24.4w 15VZ169   568  C~2nw4      
2017 09  16.62789  03 37 36.991  +17 40 25.65  24.6w 15VZ169   568  C~2nw4      

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    -0.13       0.00     0.11
     2   0.0494    -92.78    -0.05     -38.59     0.12
     3   0.0627   -186.03     0.14     -48.71    -0.07
     4   0.1313  -1088.11    -0.00     -92.47     0.07
     5   0.1314  -1091.01    -0.01     -92.55     0.05
     6   0.1369  -1188.84     0.02     -95.35     0.05
     7   0.2129  -2838.29    -0.05    -120.72    -0.02
     8   0.2131  -2842.33     0.13    -120.88    -0.18
     9   0.2133  -2847.22    -0.03    -120.84    -0.14
    10   0.2133  -2848.26     0.04    -120.78    -0.08
    11   0.2161  -2914.43     0.06    -121.05     0.02
    12   0.2434  -3580.27     0.04    -122.50    -0.00
    13   0.2436  -3586.36    -0.05    -122.56    -0.07
    14   0.2950  -4808.82     0.05    -114.18     0.10
    15   0.2954  -4817.40    -0.12    -114.26    -0.13
    16   0.3635  -6142.25    -0.06     -82.96    -0.08
    17   0.3828  -6415.77    -0.18     -70.37     0.22
    18   0.3852  -6445.04     0.24     -69.03    -0.00
    19   0.4620  -6918.47    -0.02     -10.07     0.09
    20   0.4621  -6918.39     0.05     -10.21    -0.07
    21   0.4783  -6886.98    -0.04       3.27     0.02
    22   1.1060   3308.23    -0.00     -73.60     0.03
    23   1.1334   2872.14    -0.06     -89.24    -0.01
    24   1.1336   2867.41    -0.08     -89.18     0.16
    25   1.1389   2773.90     0.10     -92.02    -0.01
    26   1.1391   2770.11     0.01     -92.31    -0.21
    27   1.2044   1376.61    -0.03    -114.91    -0.03
    28   1.2098   1248.31     0.04    -115.85    -0.02
    29   1.3465  -1866.46    -0.03     -88.22     0.05
    30   1.4395  -2935.93     0.03     -24.00     0.07
    31   2.0755   7657.16     0.00     -49.01    -0.02

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.

15VZ169    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.634    45.653    45.615
ecceobj         0.081     0.083     0.078
incobj          1.683     1.683     1.683
qmin           40.679    40.523    40.733
qmax           50.241    50.387    50.082
amean          45.319    45.336    45.300
amin           44.951    44.968    44.928
amax           45.706    45.731    45.689
emean           0.085     0.088     0.083
emin            0.072     0.074     0.070
emax            0.099     0.102     0.097
imean           1.415     1.413     1.417
imin            0.851     0.845     0.857
imax            1.892     1.895     1.890
excite_mean     0.089     0.091     0.087
fracstop        1.000     1.000     1.000
cjmean          3.108     3.108     3.108

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       175.9     175.6     175.6
kozaiamp        180.0     180.0     180.0