Orbit Fit and Astrometric record for 15VY167

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: 15VY167   
# Created Fri Dec  3 02:13:39 2021
# Orbit generated from Bernstein formalism
# Fitting     30 observations of     30
# Arc:   2.27y
# First observation: 2015/09/07
#  Last observation: 2017/12/16
Preliminary a, adot, b, bdot, g, gdot:
  -0.000148   0.021295  -0.000002   0.014891   0.025837   0.000000
# Chi-squared of fit:     9.01 DOF:     54 RMS:  0.10
# Min/Max residuals:    -0.28    0.25
# Exact a, adot, b, bdot, g, gdot:
  1.312203E-05  2.111769E-02  8.488874E-06  1.477957E-02  2.579682E-02  8.506251E-04
# Covariance matrix:
  2.3073E-13 -1.7866E-14 -1.6705E-14  7.8966E-14  1.7692E-13  2.8713E-12
 -1.7866E-14  2.0843E-13 -3.0068E-14  1.3787E-13  1.2656E-13  4.9782E-12
 -1.6705E-14 -3.0068E-14  1.1363E-13 -1.3294E-13 -3.8775E-14 -1.8374E-12
  7.8966E-14  1.3787E-13 -1.3294E-13  3.5656E-13  1.8021E-13  8.3982E-12
  1.7692E-13  1.2656E-13 -3.8775E-14  1.8021E-13  2.7164E-13  6.5273E-12
  2.8713E-12  4.9782E-12 -1.8374E-12  8.3982E-12  6.5273E-12  3.0302E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.972866   51.381117    0.929424   -0.006608   -0.397930  2457273.133899
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          130.30039 +/-     1.740
Argument of Peri:      226.69796 +/-     1.739
Long of Asc Node:       51.40068 +/-     0.000
Inclination:            34.98869 +/-     0.001
Eccentricity:         0.01520741 +/-    0.0005
Semi-Major Axis:     38.78391749 +/-    0.0024
Time of Perihelion: 2425339.0124 +/-     426.5
Perihelion:          38.19411453 +/-    0.0190
Aphelion:            39.37372045 +/-    0.0190
Period (y)              241.5381 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           25.16145310 +/-    0.0005
Ecliptic Y           30.01343344 +/-    0.0006
Ecliptic Z           -0.65784123 +/-    0.0000
Ecliptic XDOT        -0.00168003 +/-    0.0000
Ecliptic YDOT         0.00148376 +/-    0.0000
Ecliptic ZDOT         0.00156687 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.17062247 +/-    0.0006
Geocenter to KBO     38.76446069 +/-    0.0008
# Hcoef:  9.16

The following table shows the complete astrometric record for 15VY167. 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 (15VY167) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.63311  03 16 52.958  +17 10 03.09  24.5w 15VY167   568  C~2lVk      
2015 09  12.49674  03 16 43.041  +17 09 59.90  25.4w 15VY167   568  C~2lVk      
2015 10  07.54436  03 15 18.686  +17 07 41.86  25.1w 15VY167   568  C~2lVk      
2015 10  07.60373  03 15 18.423  +17 07 41.19  25.7w 15VY167   568  C~2lVk      
2015 10  09.58362  03 15 09.683  +17 07 22.93  24.8w 15VY167   568  C~2lVk      
2015 11  07.35377  03 12 40.803  +17 01 37.01  24.8r 15VY167   568  C~2lVk      
2015 11  07.39585  03 12 40.568  +17 01 36.52  25.1r 15VY167   568  C~2lVk      
2015 11  07.43803  03 12 40.326  +17 01 35.76  24.8r 15VY167   568  C~2lVk      
2015 11  10.52298  03 12 22.908  +17 00 54.05  25.0w 15VY167   568  C~2lVk      
2015 11  17.37547  03 11 44.214  +16 59 21.32  25.3w 15VY167   568  C~2lVk      
2015 11  17.42215  03 11 43.941  +16 59 20.74  25.6w 15VY167   568  C~2lVk      
2015 12  06.37850  03 10 01.006  +16 55 23.29  24.8w 15VY167   568  C~2lVk      
2015 12  13.31287  03 09 26.799  +16 54 11.20  24.9w 15VY167   568  C~2lVk      
2015 12  13.37141  03 09 26.503  +16 54 10.37  24.9w 15VY167   568  C~2lVk      
2016 01  01.36607  03 08 09.056  +16 51 59.92  25.0w 15VY167   568  C~2lVk      
2016 01  07.31283  03 07 50.832  +16 51 43.72  26.6w 15VY167   568  C~2lVk      
2016 02  04.28927  03 07 12.108  +16 53 37.20  25.0w 15VY167   568  C~2lVk      
2016 02  10.27908  03 07 14.566  +16 54 44.70  25.6w 15VY167   568  C~2lVk      
2016 09  06.61138  03 20 52.517  +18 17 43.99        15VY167   568  C~2lVk      
2016 09  26.60062  03 19 59.763  +18 17 15.94  24.9w 15VY167   568  C~2lVk      
2016 11  02.53154  03 17 04.764  +18 11 32.39  25.0w 15VY167   568  C~2lVk      
2016 11  02.53733  03 17 04.719  +18 11 32.25  25.0w 15VY167   568  C~2lVk      
2016 11  04.40663  03 16 54.271  +18 11 08.54  25.5w 15VY167   568  C~2lVk      
2016 11  04.41248  03 16 54.234  +18 11 08.47  25.6w 15VY167   568  C~2lVl      
2016 12  24.30698  03 12 33.372  +18 01 30.84  25.4w 15VY167   568  C~2lVl      
2017 01  02.38784  03 12 00.026  +18 00 37.31  25.8w 15VY167   568  C~2lVl      
2017 01  02.40920  03 11 59.948  +18 00 37.33  26.9w 15VY167   568  C~2lVl      
2017 01  26.29981  03 11 09.160  +18 00 37.26  25.1w 15VY167   568  C~2lVl      
2017 09  22.59291  03 24 16.955  +19 25 15.75  25.4w 15VY167   568  C~2lVl      
2017 12  16.36391  03 17 10.107  +19 11 20.19        15VY167   568  C~2lVl      

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     0.12
     2   0.0133   -138.07    -0.05      33.87     0.08
     3   0.0819  -1341.31    -0.01     216.09     0.04
     4   0.0821  -1345.12    -0.04     216.43    -0.08
     5   0.0875  -1470.82     0.05     231.62     0.10
     6   0.1662  -3621.64     0.07     460.51    -0.09
     7   0.1664  -3625.02     0.16     460.93    -0.04
     8   0.1665  -3628.57     0.10     461.12    -0.22
     9   0.1749  -3880.59    -0.19     487.18     0.00
    10   0.1937  -4440.55     0.06     545.34     0.06
    11   0.1938  -4444.48    -0.00     545.83     0.13
    12   0.2457  -5932.08     0.06     711.85    -0.00
    13   0.2647  -6424.76     0.09     774.36     0.06
    14   0.2649  -6429.08    -0.16     774.70    -0.15
    15   0.3169  -7535.97     0.02     949.20     0.04
    16   0.3331  -7792.55     0.14    1004.50     0.12
    17   0.4097  -8297.54    -0.28    1264.82    -0.05
    18   0.4261  -8245.16    -0.09    1320.23    -0.03
    19   0.9993   4353.24    -0.12    3044.16    -0.11
    20   1.0540   3619.31    -0.10    3208.80    -0.04
    21   1.1551   1121.24     0.25    3519.25    -0.02
    22   1.1551   1120.58     0.06    3519.28    -0.04
    23   1.1602    970.62     0.01    3535.05    -0.06
    24   1.1602    970.09    -0.04    3535.12    -0.05
    25   1.2968  -2771.06     0.08    3954.69    -0.04
    26   1.3217  -3244.05     0.03    4029.57     0.02
    27   1.3218  -3245.11    -0.03    4029.88     0.16
    28   1.3872  -3943.79     0.05    4223.19     0.03
    29   2.0423   8189.65    -0.01    6236.82    -0.04
    30   2.2744   2126.46    -0.08    6966.93     0.10

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.

15VY167    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        39.084    39.094    39.075
ecceobj         0.016     0.017     0.016
incobj         34.862    34.862    34.862
qmin           37.700    37.642    37.689
qmax           40.188    40.180    40.168
amean          38.853    38.867    38.844
amin           38.567    38.579    38.570
amax           39.140    39.149    39.131
emean           0.017     0.017     0.016
emin            0.008     0.008     0.008
emax            0.027     0.027     0.027
imean          33.891    33.894    33.891
imin           33.558    33.564    33.559
imax           34.226    34.231    34.232
excite_mean     0.558     0.558     0.558
fracstop        1.000     1.000     1.000
cjmean          2.661     2.661     2.661

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       185.3     181.7     184.1
kozaiamp        180.0     179.9     179.9