Orbit Fit and Astrometric record for 15VL172

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: 15VL172   
# Created Mon Dec  6 02:13:42 2021
# Orbit generated from Bernstein formalism
# Fitting     27 observations of     27
# Arc:   2.01y
# First observation: 2015/09/12
#  Last observation: 2017/09/15
Preliminary a, adot, b, bdot, g, gdot:
  -0.000154   0.027813   0.000002   0.001791   0.026059   0.000000
# Chi-squared of fit:    13.91 DOF:     48 RMS:  0.13
# Min/Max residuals:    -0.29    0.35
# Exact a, adot, b, bdot, g, gdot:
  1.700451E-05  2.764284E-02  1.088527E-06  1.787576E-03  2.608525E-02  1.067947E-03
# Covariance matrix:
  2.7213E-13 -3.1125E-14 -1.8894E-15  9.5342E-15  2.0679E-13  3.2865E-12
 -3.1125E-14  4.2967E-13 -5.2592E-15  2.7013E-14  1.9826E-13  9.2890E-12
 -1.8894E-15 -5.2592E-15  1.1630E-13 -1.0776E-13 -4.5314E-15 -1.9969E-13
  9.5342E-15  2.7013E-14 -1.0776E-13  1.8702E-13  2.3088E-14  1.0252E-12
  2.0679E-13  1.9826E-13 -4.5314E-15  2.3088E-14  3.1972E-13  7.9479E-12
  3.2865E-12  9.2890E-12 -1.9969E-13  1.0252E-12  7.9479E-12  3.5255E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.019446   50.560134    0.885658    0.000310   -0.485405  2457278.009839
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:            6.37532 +/-     0.308
Argument of Peri:      352.28077 +/-     0.388
Long of Asc Node:       48.95968 +/-     0.000
Inclination:             3.70285 +/-     0.001
Eccentricity:         0.10946346 +/-    0.0001
Semi-Major Axis:     43.55917439 +/-    0.0037
Time of Perihelion: 2455410.9101 +/-      89.9
Perihelion:          38.79103625 +/-    0.0069
Aphelion:            48.32731253 +/-    0.0073
Period (y)              287.4933 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           25.34179021 +/-    0.0005
Ecliptic Y           29.41844092 +/-    0.0006
Ecliptic Z            0.01306409 +/-    0.0000
Ecliptic XDOT        -0.00217134 +/-    0.0000
Ecliptic YDOT         0.00192321 +/-    0.0000
Ecliptic ZDOT         0.00018771 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.82848398 +/-    0.0006
Geocenter to KBO     38.33583544 +/-    0.0008
# Hcoef:  9.29

The following table shows the complete astrometric record for 15VL172. 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 (15VL172) followed by the observatory code and reference code for the source of the astrometry.

2015 09  12.50905  03 12 27.967  +17 54 33.55  25.3w 15VL172   568  C~2nwD      
2015 10  07.43408  03 11 10.455  +17 49 54.57  25.0w 15VL172   568  C~2nwD      
2015 10  08.44583  03 11 06.283  +17 49 39.31  25.2w 15VL172   568  C~2nwD      
2015 10  08.50488  03 11 06.030  +17 49 38.09  25.1w 15VL172   568  C~2nwD      
2015 11  07.35377  03 08 40.804  +17 40 31.43  24.6r 15VL172   568  C~2nwD      
2015 11  07.39585  03 08 40.580  +17 40 30.60  24.9r 15VL172   568  C~2nwD      
2015 11  07.43803  03 08 40.353  +17 40 29.69  25.2r 15VL172   568  C~2nwD      
2015 11  10.52298  03 08 23.918  +17 39 27.08  24.9w 15VL172   568  C~2nwD      
2015 11  17.36965  03 07 47.455  +17 37 07.42  25.7w 15VL172   568  C~2nwD      
2015 11  17.41626  03 07 47.201  +17 37 06.72  25.4w 15VL172   568  C~2nwD      
2015 12  06.37850  03 06 10.872  +17 30 56.32  25.3w 15VL172   568  C~2nwD      
2015 12  13.31287  03 05 39.278  +17 28 54.47  25.6w 15VL172   568  C~2nwD      
2015 12  13.37141  03 05 39.045  +17 28 53.55  25.7w 15VL172   568  C~2nwD      
2016 01  01.36607  03 04 29.272  +17 24 26.68  25.3w 15VL172   568  C~2nwD      
2016 01  07.31283  03 04 13.602  +17 23 28.56  25.8w 15VL172   568  C~2nwD      
2016 02  04.28927  03 03 47.561  +17 22 08.33  25.1w 15VL172   568  C~2nwD      
2016 02  10.27908  03 03 52.824  +17 22 35.24  25.6w 15VL172   568  C~2nwD      
2016 09  06.61138  03 18 54.928  +18 25 42.09  25.1w 15VL172   568  C~2nwD      
2016 09  26.60062  03 18 08.325  +18 23 09.57  26.2w 15VL172   568  C~2nwD      
2016 10  10.40808  03 17 16.475  +18 20 08.37  25.5w 15VL172   568  C~2nwD      
2016 10  10.46643  03 17 16.202  +18 20 07.59  25.7w 15VL172   568  C~2nwD      
2016 10  27.50259  03 15 56.073  +18 15 19.65  25.4w 15VL172   568  C~2nwD      
2016 11  03.52763  03 15 19.638  +18 13 06.80  25.3w 15VL172   568  C~2nwD      
2016 12  29.38063  03 10 53.944  +17 56 41.10  26.2w 15VL172   568  C~2nwD      
2017 01  02.38784  03 10 41.608  +17 55 55.92  25.1w 15VL172   568  C~2nwD      
2017 01  26.27742  03 10 00.108  +17 53 30.08  25.3w 15VL172   568  C~2nwD      
2017 09  15.60695  03 24 59.402  +18 54 47.57  25.4w 15VL172   568  C~2nwD      

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    -0.05       0.00    -0.00
     2   0.0682  -1140.93     0.21      25.89    -0.14
     3   0.0710  -1202.41     0.08      27.11     0.01
     4   0.0712  -1206.22    -0.05      26.90    -0.29
     5   0.1529  -3351.76    -0.11      58.21    -0.02
     6   0.1530  -3355.07    -0.06      58.28    -0.02
     7   0.1531  -3358.44    -0.06      58.28    -0.08
     8   0.1616  -3601.58    -0.10      61.57     0.01
     9   0.1803  -4141.35    -0.05      68.49    -0.04
    10   0.1804  -4145.03    -0.01      68.81     0.20
    11   0.2324  -5572.18     0.03      87.94     0.26
    12   0.2513  -6040.62    -0.20      94.57     0.06
    13   0.2515  -6044.08     0.19      94.60     0.01
    14   0.3035  -7078.48    -0.19     112.61    -0.29
    15   0.3198  -7310.39     0.10     118.63     0.11
    16   0.3964  -7691.33     0.15     144.56     0.35
    17   0.4128  -7611.37     0.14     149.58     0.01
    18   0.9859   5813.19     0.01     362.34    -0.08
    19   1.0406   5132.52     0.12     385.82    -0.10
    20   1.0784   4372.21     0.09     401.73    -0.03
    21   1.0786   4368.25    -0.17     401.99     0.13
    22   1.1252   3191.06     0.09     420.83     0.03
    23   1.1445   2655.20    -0.03     428.29    -0.04
    24   1.2974  -1259.33    -0.11     480.65    -0.20
    25   1.3084  -1441.05    -0.02     484.26     0.14
    26   1.3738  -2050.84     0.02     502.69     0.01
    27   2.0099  11275.37    -0.00     741.25    -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.

15VL172    quality flag:2

Type:       SCATNEAR  SCATNEAR CLASSICAL

axisobj        44.032    44.048    44.017
ecceobj         0.119     0.120     0.118
incobj          3.690     3.690     3.690
qmin           37.339    37.821    36.946
qmax           50.527    50.200    50.674
amean          43.667    43.779    43.631
amin           43.276    43.301    43.258
amax           44.212    44.232    44.052
emean           0.115     0.111     0.121
emin            0.088     0.092     0.093
emax            0.145     0.135     0.151
imean           1.585     1.876     1.619
imin            0.183     0.601     0.268
imax            3.188     3.189     3.187
excite_mean     0.120     0.117     0.125
fracstop        1.000     1.000     1.000
cjmean          3.080     3.082     3.078

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       174.2     190.1     170.1
kozaiamp        179.9     179.9     180.0