Orbit Fit and Astrometric record for 15VQ169

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: 15VQ169   
# Created Tue Apr  1 01:10:40 2025
# Orbit generated from Bernstein formalism
# Fitting     28 observations of     28
# Arc:   1.44y
# First observation: 2015/08/20
#  Last observation: 2017/01/27
Preliminary a, adot, b, bdot, g, gdot:
  -0.000106   0.021233   0.000001   0.000258   0.022648   0.000000
# Chi-squared of fit:     3.66 DOF:     50 RMS:  0.06
# Min/Max residuals:    -0.11    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.460724E-05  2.089640E-02  7.101155E-07  2.545483E-04  2.243241E-02  1.034028E-03
# Covariance matrix:
  3.0378E-13  5.9039E-14 -1.4718E-15  6.1144E-15  3.3597E-13  1.5348E-11
  5.9039E-14  4.2777E-13 -1.8861E-15  8.4066E-15  3.6863E-13  2.1080E-11
 -1.4718E-15 -1.8861E-15  1.2204E-13 -1.2147E-13 -3.0832E-15 -1.8466E-13
  6.1144E-15  8.4066E-15 -1.2147E-13  2.0785E-13  1.3296E-14  8.4829E-13
  3.3597E-13  3.6863E-13 -3.0832E-15  1.3296E-14  6.5097E-13  3.3357E-11
  1.5348E-11  2.1080E-11 -1.8466E-13  8.4829E-13  3.3357E-11  2.1263E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.118659   54.788180    1.013758    0.000216   -0.041402  2457255.041279
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:          125.48705 +/-     2.600
Argument of Peri:      241.30809 +/-     2.591
Long of Asc Node:       43.90381 +/-     0.018
Inclination:             0.71208 +/-     0.001
Eccentricity:         0.03043921 +/-    0.0017
Semi-Major Axis:     43.82777260 +/-    0.0059
Time of Perihelion: 2420308.6237 +/-     765.3
Perihelion:          42.49369002 +/-    0.0734
Aphelion:            45.16185518 +/-    0.0734
Period (y)              290.1565 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           26.55192931 +/-    0.0009
Ecliptic Y           35.87074202 +/-    0.0013
Ecliptic Z            0.09237797 +/-    0.0000
Ecliptic XDOT        -0.00201299 +/-    0.0000
Ecliptic YDOT         0.00156724 +/-    0.0000
Ecliptic ZDOT         0.00003138 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.62873084 +/-    0.0012
Geocenter to KBO     44.57835022 +/-    0.0016
# Hcoef:  7.47

The following table shows the complete astrometric record for 15VQ169. 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 (15VQ169) followed by the observatory code and reference code for the source of the astrometry.

2015 08  20.54049  03 29 36.456  +19 04 49.23  24.5w 15VQ169   568  C~2nw2      
2015 09  07.59637  03 29 31.236  +19 04 36.59  24.3w 15VQ169   568  C~2nw2      
2015 09  12.44325  03 29 24.908  +19 04 15.56  24.4w 15VQ169   568  C~2nw2      
2015 10  07.49180  03 28 21.667  +19 00 37.61  24.2w 15VQ169   568  C~2nw2      
2015 10  07.55020  03 28 21.462  +19 00 36.90  24.2w 15VQ169   568  C~2nw2      
2015 10  09.53094  03 28 14.536  +19 00 12.65  24.3w 15VQ169   568  C~2nw2      
2015 11  06.30734  03 26 17.107  +18 53 16.23  23.6r 15VQ169   568  C~2nw2      
2015 11  06.37060  03 26 16.808  +18 53 15.23  24.2r 15VQ169   568  C~2nw2      
2015 11  06.44142  03 26 16.461  +18 53 14.16  24.0r 15VQ169   568  C~2nw2      
2015 11  07.46098  03 26 11.666  +18 52 56.83  24.0w 15VQ169   568  C~2nw2      
2015 11  17.44217  03 25 24.076  +18 50 05.61  23.9w 15VQ169   568  C~2nw2      
2015 11  17.48946  03 25 23.838  +18 50 04.73  24.0w 15VQ169   568  C~2nw2      
2015 12  06.30809  03 23 56.102  +18 44 46.05  24.2w 15VQ169   568  C~2nw2      
2015 12  06.43481  03 23 55.516  +18 44 43.99  23.6w 15VQ169   568  C~2nw2      
2015 12  31.32982  03 22 20.417  +18 38 54.08  24.3w 15VQ169   568  C~2nw2      
2016 01  07.35914  03 22 00.742  +18 37 41.25  24.2w 15VQ169   568  C~2nw2      
2016 02  05.30505  03 21 24.276  +18 35 24.64  24.4w 15VQ169   568  C~2nw2      
2016 02  11.25843  03 21 26.417  +18 35 32.44  24.3w 15VQ169   568  C~2nw2      
2016 09  07.61990  03 34 26.366  +19 22 41.93        15VQ169   568  C~2nw2      
2016 09  27.54346  03 33 48.253  +19 20 37.01  24.1w 15VQ169   568  C~2nw2      
2016 10  09.53944  03 33 10.508  +19 18 30.02  24.2w 15VQ169   568  C~2nw2      
2016 10  09.61149  03 33 10.251  +19 18 29.15  24.2w 15VQ169   568  C~2nw2      
2016 10  31.51783  03 31 40.056  +19 13 20.64  24.7w 15VQ169   568  C~2nw2      
2016 11  02.46775  03 31 31.104  +19 12 49.46  24.1w 15VQ169   568  C~2nw2      
2016 11  04.44390  03 31 21.932  +19 12 17.65  24.1w 15VQ169   568  C~2nw2      
2016 12  29.39711  03 27 21.049  +18 58 07.49  24.2w 15VQ169   568  C~2nw2      
2017 01  27.32921  03 26 20.711  +18 54 29.05  24.0w 15VQ169   568  C~2nw2      
2017 01  27.33784  03 26 20.701  +18 54 29.06  24.0w 15VQ169   568  C~2nw2      

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     0.03       0.00    -0.11
     2   0.0494    -74.85    -0.10       5.70     0.01
     3   0.0627   -166.98     0.16       7.09    -0.02
     4   0.1313  -1089.79    -0.04      14.23    -0.01
     5   0.1314  -1092.78    -0.04      14.25    -0.02
     6   0.1369  -1193.96     0.01      14.75    -0.03
     7   0.2129  -2911.39    -0.02      20.83    -0.03
     8   0.2131  -2915.75     0.02      20.91     0.01
     9   0.2133  -2920.79    -0.07      21.09     0.15
    10   0.2161  -2991.03    -0.01      21.13    -0.00
    11   0.2434  -3688.10     0.09      22.74    -0.03
    12   0.2435  -3691.59    -0.03      22.73    -0.06
    13   0.2951  -4978.17     0.08      24.95    -0.00
    14   0.2954  -4986.75    -0.11      25.04     0.04
    15   0.3636  -6383.59     0.03      26.28     0.02
    16   0.3828  -6672.86    -0.07      26.53     0.16
    17   0.4621  -7209.56     0.05      25.78    -0.05
    18   0.4784  -7178.10     0.03      25.60    -0.01
    19   1.0516   4244.02    -0.01      58.83     0.01
    20   1.1061   3690.20    -0.06      64.96    -0.01
    21   1.1389   3140.91    -0.00      68.36     0.00
    22   1.1391   3137.16     0.06      68.38    -0.01
    23   1.1991   1823.08     0.01      73.76     0.20
    24   1.2045   1692.50    -0.00      73.91    -0.02
    25   1.2099   1558.74     0.05      74.23    -0.07
    26   1.3603  -1960.19    -0.06      79.43    -0.08
    27   1.4395  -2843.82     0.02      78.75    -0.05
    28   1.4396  -2843.95    -0.00      78.80    -0.00

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.

15VQ169    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.235    44.262    44.211
ecceobj         0.031     0.036     0.026
incobj          0.710     0.710     0.710
qmin           41.902    41.679    42.041
qmax           46.119    46.350    45.918
amean          43.911    43.936    43.889
amin           43.573    43.591    43.553
amax           44.259    44.291    44.238
emean           0.027     0.032     0.023
emin            0.011     0.015     0.006
emax            0.043     0.047     0.038
imean           1.455     1.456     1.454
imin            0.721     0.724     0.717
imax            1.988     1.989     1.988
excite_mean     0.038     0.041     0.035
fracstop        1.000     1.000     1.000
cjmean          3.099     3.099     3.099

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       180.5     182.2     178.7
kozaiamp        180.0     180.0     179.9