Orbit Fit and Astrometric record for 15VQ167

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: 15VQ167   
# Created Thu Dec  9 02:13:36 2021
# Orbit generated from Bernstein formalism
# Fitting     26 observations of     26
# Arc:   2.27y
# First observation: 2015/09/07
#  Last observation: 2017/12/16
Preliminary a, adot, b, bdot, g, gdot:
  -0.000021   0.018303   0.000043  -0.009985   0.020776   0.000000
# Chi-squared of fit:     6.08 DOF:     46 RMS:  0.09
# Min/Max residuals:    -0.20    0.18
# Exact a, adot, b, bdot, g, gdot:
  1.444425E-05  1.798700E-02 -7.511721E-06 -9.738833E-03  2.058226E-02 -8.342744E-03
# Covariance matrix:
  2.3294E-13  1.9157E-14  1.8130E-14 -7.8842E-14  1.8780E-13  3.6230E-12
  1.9157E-14  3.2411E-13  4.7585E-14 -2.1679E-13  2.1577E-13  9.9358E-12
  1.8130E-14  4.7585E-14  1.1679E-13 -1.1190E-13  4.4213E-14  2.0098E-12
 -7.8842E-14 -2.1679E-13 -1.1190E-13  2.8874E-13 -1.9710E-13 -9.1589E-12
  1.8780E-13  2.1577E-13  4.4213E-14 -1.9710E-13  3.2229E-13  9.0442E-12
  3.6230E-12  9.9358E-12  2.0098E-12 -9.1589E-12  9.0442E-12  4.1975E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.229224   51.910656    0.933062   -0.008204   -0.389292  2457273.133899
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          340.72538 +/-     0.053
Argument of Peri:      250.85737 +/-     0.050
Long of Asc Node:      228.59576 +/-     0.000
Inclination:            28.72142 +/-     0.001
Eccentricity:         0.55845673 +/-    0.0011
Semi-Major Axis:     85.86605143 +/-    0.1563
Time of Perihelion: 2472830.6553 +/-       2.7
Perihelion:          37.91357738 +/-    0.1187
Aphelion:           133.81852548 +/-    0.2620
Period (y)              795.6837 +/-      2.17
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           30.93544763 +/-    0.0008
Ecliptic Y           37.96109085 +/-    0.0010
Ecliptic Z           -1.04263234 +/-    0.0000
Ecliptic XDOT        -0.00258657 +/-    0.0000
Ecliptic YDOT         0.00057447 +/-    0.0000
Ecliptic ZDOT        -0.00127130 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   48.98094957 +/-    0.0010
Geocenter to KBO     48.58553496 +/-    0.0013
# Hcoef:  8.37

The following table shows the complete astrometric record for 15VQ167. 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 (15VQ167) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.63311  03 19 18.025  +17 03 23.75  25.4w 15VQ167   568  C~2lVj      
2015 09  12.49674  03 19 11.628  +17 02 24.54  25.6w 15VQ167   568  C~2lVj      
2015 10  07.54436  03 18 12.043  +16 55 41.89  25.5w 15VQ167   568  C~2lVj      
2015 10  07.60373  03 18 11.848  +16 55 40.85  25.7w 15VQ167   568  C~2lVj      
2015 10  09.58362  03 18 05.475  +16 55 03.09  25.5w 15VQ167   568  C~2lVj      
2015 11  07.33788  03 16 15.230  +16 44 54.38  25.1r 15VQ167   568  C~2lVj      
2015 11  07.38006  03 16 15.049  +16 44 53.21  25.1r 15VQ167   568  C~2lVj      
2015 11  07.42224  03 16 14.875  +16 44 52.39  25.6r 15VQ167   568  C~2lVj      
2015 11  10.50536  03 16 01.851  +16 43 43.84  25.4w 15VQ167   568  C~2lVj      
2015 11  17.35218  03 15 32.848  +16 41 11.39  25.2w 15VQ167   568  C~2lVj      
2015 11  17.39878  03 15 32.637  +16 41 10.24  25.4w 15VQ167   568  C~2lVj      
2015 12  06.36096  03 14 15.152  +16 34 25.95  25.8w 15VQ167   568  C~2lVj      
2016 01  01.34872  03 12 51.100  +16 26 53.65  25.2w 15VQ167   568  C~2lVj      
2016 01  08.25624  03 12 35.636  +16 25 23.10  25.0w 15VQ167   568  C~2lVj      
2016 02  05.28768  03 12 11.376  +16 21 56.77  25.2w 15VQ167   568  C~2lVj      
2016 02  10.30807  03 12 14.010  +16 21 48.37  26.2w 15VQ167   568  C~2lVj      
2016 09  07.56206  03 24 04.928  +16 46 24.02        15VQ167   568  C~2lVj      
2016 10  10.43747  03 22 49.855  +16 37 32.30  25.6w 15VQ167   568  C~2lVj      
2016 11  02.51995  03 21 22.118  +16 29 24.77  25.0w 15VQ167   568  C~2lVj      
2017 01  02.43457  03 17 32.602  +16 09 42.81  25.1w 15VQ167   568  C~2lVj      
2017 01  26.34976  03 16 55.676  +16 05 57.18  25.7w 15VQ167   568  C~2lVj      
2017 09  16.63393  03 28 44.413  +16 26 48.72  25.4w 15VQ167   568  C~2lVj      
2017 09  17.59434  03 28 42.756  +16 26 34.65        15VQ167   568  C~2lVj      
2017 09  23.57295  03 28 30.855  +16 25 00.26  25.9w 15VQ167   568  C~2lVj      
2017 12  16.35926  03 23 16.213  +15 56 38.07  25.3w 15VQ167   568  C~2lVj      
2017 12  16.37785  03 23 16.159  +15 56 37.72  25.3w 15VQ167   568  C~2lVj      

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     0.01
     2   0.0133   -103.87     0.06     -33.67    -0.02
     3   0.0819  -1033.51     0.05    -202.72    -0.11
     4   0.0821  -1036.48     0.03    -203.00    -0.02
     5   0.0875  -1134.59     0.01    -215.87     0.04
     6   0.1662  -2821.27    -0.02    -393.38     0.06
     7   0.1663  -2824.09    -0.09    -393.83    -0.16
     8   0.1664  -2826.72     0.02    -393.98    -0.08
     9   0.1749  -3025.24    -0.05    -411.42     0.15
    10   0.1936  -3467.37     0.04    -449.86     0.03
    11   0.1937  -3470.60    -0.13    -450.17    -0.05
    12   0.2457  -4651.75    -0.07    -548.55     0.04
    13   0.3168  -5937.89     0.12    -666.22    -0.01
    14   0.3357  -6176.61    -0.08    -694.68    -0.11
    15   0.4125  -6568.30     0.04    -801.17     0.02
    16   0.4262  -6533.94     0.10    -819.34     0.11
    17   1.0019   3724.40     0.10   -2031.34     0.03
    18   1.0919   2546.40     0.03   -2274.57     0.04
    19   1.1551   1202.38     0.16   -2426.68     0.03
    20   1.3218  -2294.55     0.01   -2721.81     0.18
    21   1.3873  -2867.08    -0.10   -2801.91    -0.01
    22   2.0260   7328.34    -0.11   -4168.20    -0.04
    23   2.0286   7301.74     0.01   -4176.00     0.15
    24   2.0450   7112.34     0.01   -4225.48    -0.20
    25   2.2744   2295.02    -0.10   -4746.08     0.00
    26   2.2745   2294.18     0.09   -4746.22    -0.07

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.

15VQ167    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        86.763    87.198    86.336
ecceobj         0.559     0.563     0.556
incobj         28.592    28.592    28.592
qmin           37.094    36.969    37.004
qmax          137.375   138.115   136.128
amean          85.676    86.081    85.177
amin           84.357    84.782    83.712
amax           87.693    87.948    87.114
emean           0.556     0.556     0.545
emin            0.547     0.545     0.527
emax            0.567     0.571     0.565
imean          29.559    29.794    30.101
imin           29.272    29.253    29.189
imax           29.872    30.274    31.093
excite_mean     0.743     0.746     0.741
fracstop        1.000     1.000     1.000
cjmean          2.791     2.789     2.792

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       275.8     242.7     192.1
kozaiamp        180.0     180.0     180.0