Orbit Fit and Astrometric record for 15VG170

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: 15VG170   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting     33 observations of     33
# Arc:   2.32y
# First observation: 2015/08/20
#  Last observation: 2017/12/13
Preliminary a, adot, b, bdot, g, gdot:
  -0.000157   0.026815  -0.000001   0.000138   0.025738   0.000000
# Chi-squared of fit:     5.69 DOF:     60 RMS:  0.07
# Min/Max residuals:    -0.19    0.18
# Exact a, adot, b, bdot, g, gdot:
  1.585882E-05  2.632629E-02  2.457021E-07  1.349615E-04  2.546422E-02 -3.551524E-04
# Covariance matrix:
  2.1288E-13 -4.7391E-14  5.5959E-16  1.4105E-16  1.2939E-13  1.0218E-12
 -4.7391E-14  3.9801E-13  1.3391E-16  1.5340E-15  1.7823E-13  8.8722E-12
  5.5959E-16  1.3391E-16  9.9075E-14 -7.2261E-14  6.4202E-16  5.3599E-15
  1.4105E-16  1.5340E-15 -7.2261E-14  9.3134E-14  9.1306E-16  4.4680E-14
  1.2939E-13  1.7823E-13  6.4202E-16  9.1306E-16  2.2219E-13  5.4927E-12
  1.0218E-12  8.8722E-12  5.3599E-15  4.4680E-14  5.4927E-12  2.5897E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.419624   53.369948    1.012371   -0.000357   -0.067084  2457255.076589
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:          329.52826 +/-     0.345
Argument of Peri:      339.37628 +/-     0.420
Long of Asc Node:      107.79005 +/-     0.061
Inclination:             0.50576 +/-     0.000
Eccentricity:         0.07616355 +/-    0.0003
Semi-Major Axis:     42.03902431 +/-    0.0031
Time of Perihelion: 2465677.4819 +/-      95.4
Perihelion:          38.83718280 +/-    0.0149
Aphelion:            45.24086582 +/-    0.0150
Period (y)              272.5757 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           24.27854121 +/-    0.0004
Ecliptic Y           30.96380175 +/-    0.0006
Ecliptic Z           -0.28757883 +/-    0.0000
Ecliptic XDOT        -0.00229623 +/-    0.0000
Ecliptic YDOT         0.00165190 +/-    0.0000
Ecliptic ZDOT         0.00001485 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.34828184 +/-    0.0005
Geocenter to KBO     39.27078198 +/-    0.0007
# Hcoef:  8.12

The following table shows the complete astrometric record for 15VG170. 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 (15VG170) followed by the observatory code and reference code for the source of the astrometry.

2015 08  20.57580  03 24 21.869  +18 12 33.68  24.2w 15VG170   568  C~2nw5      
2015 10  07.52101  03 22 56.446  +18 06 53.83  24.3w 15VG170   568  C~2nw5      
2015 10  07.58040  03 22 56.214  +18 06 52.89  24.4w 15VG170   568  C~2nw5      
2015 10  09.56029  03 22 48.415  +18 06 23.34  24.3w 15VG170   568  C~2nw5      
2015 11  06.33360  03 20 36.995  +17 58 07.00  23.9r 15VG170   568  C~2nw5      
2015 11  06.39716  03 20 36.640  +17 58 05.85  24.0r 15VG170   568  C~2nw5      
2015 11  06.40423  03 20 36.609  +17 58 05.55  24.0r 15VG170   568  C~2nw5      
2015 11  06.47375  03 20 36.251  +17 58 04.18  24.5r 15VG170   568  C~2nw5      
2015 11  07.49015  03 20 30.919  +17 57 44.21  24.0w 15VG170   568  C~2nw5      
2015 11  17.47136  03 19 38.097  +17 54 25.56  24.0w 15VG170   568  C~2nw5      
2015 11  17.55969  03 19 37.616  +17 54 23.74  24.5w 15VG170   568  C~2nw5      
2015 12  06.33759  03 18 01.283  +17 48 22.03  24.2w 15VG170   568  C~2nw5      
2015 12  06.47504  03 18 00.598  +17 48 19.63  24.3w 15VG170   568  C~2nw5      
2015 12  31.35875  03 16 18.140  +17 41 58.26  24.2w 15VG170   568  C~2nw5      
2016 01  07.38812  03 15 57.555  +17 40 43.39  24.4w 15VG170   568  C~2nw5      
2016 01  07.42286  03 15 57.463  +17 40 42.93  24.5w 15VG170   568  C~2nw5      
2016 01  08.24465  03 15 55.369  +17 40 35.40  24.2w 15VG170   568  C~2nw5      
2016 02  04.37827  03 15 23.423  +17 38 51.37  24.1w 15VG170   568  C~2nw5      
2016 02  11.24103  03 15 27.645  +17 39 12.91  24.6w 15VG170   568  C~2nw5      
2016 09  07.59099  03 30 26.455  +18 34 47.79  24.4w 15VG170   568  C~2nw5      
2016 09  27.52301  03 29 43.625  +18 32 05.94  24.2w 15VG170   568  C~2nw5      
2016 10  05.50531  03 29 16.654  +18 30 26.59  24.2w 15VG170   568  C~2nw5      
2016 10  07.50982  03 29 09.101  +18 29 59.03  24.4w 15VG170   568  C~2nw5      
2016 10  07.60551  03 29 08.736  +18 29 57.67  24.2w 15VG170   568  C~2nw5      
2016 10  09.51019  03 29 01.300  +18 29 30.49  24.4w 15VG170   568  C~2nw5      
2016 10  09.58259  03 29 01.001  +18 29 29.27  24.3w 15VG170   568  C~2nw5      
2016 11  02.47946  03 27 09.890  +18 22 45.26  24.5w 15VG170   568  C~2nw5      
2016 12  28.44773  03 22 37.971  +18 06 23.47  24.2w 15VG170   568  C~2nw5      
2017 01  27.31434  03 21 32.565  +18 02 39.63  23.9w 15VG170   568  C~2nw5      
2017 09  15.55809  03 36 29.234  +18 56 13.06  24.5w 15VG170   568  C~2nw5      
2017 09  20.60688  03 36 18.856  +18 55 35.29  24.2w 15VG170   568  C~2nw5      
2017 12  13.36234  03 29 57.706  +18 33 22.97  24.2w 15VG170   568  C~2nw5      
2017 12  13.40466  03 29 57.496  +18 33 22.38  24.4w 15VG170   568  C~2nw5      

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     0.10       0.00    -0.03
     2   0.1313  -1263.84     0.01     -23.66     0.03
     3   0.1314  -1267.28     0.04     -23.74    -0.04
     4   0.1369  -1382.33     0.08     -24.34     0.03
     5   0.2129  -3321.61     0.06     -29.65    -0.05
     6   0.2131  -3326.80    -0.15     -29.47     0.10
     7   0.2131  -3327.31    -0.10     -29.65    -0.08
     8   0.2133  -3332.60     0.06     -29.67    -0.12
     9   0.2161  -3411.28     0.02     -29.59    -0.03
    10   0.2434  -4191.11     0.08     -29.08     0.05
    11   0.2436  -4198.21    -0.01     -29.08     0.03
    12   0.2950  -5621.17     0.00     -25.04     0.05
    13   0.2954  -5631.25    -0.06     -24.84     0.18
    14   0.3635  -7145.22     0.09     -13.73    -0.05
    15   0.3828  -7449.12    -0.04      -9.36     0.10
    16   0.3829  -7450.51    -0.06      -9.46    -0.02
    17   0.3851  -7481.41     0.02      -8.93     0.03
    18   0.4594  -7949.99    -0.17       9.91     0.02
    19   0.4782  -7886.01     0.11      14.93    -0.00
    20   1.0514   5359.26     0.09      17.61     0.02
    21   1.1059   4728.77     0.03       8.10     0.00
    22   1.1278   4332.33    -0.10       4.94    -0.11
    23   1.1333   4221.36    -0.19       4.36    -0.01
    24   1.1336   4215.99    -0.03       4.30    -0.06
    25   1.1388   4106.74     0.03       3.70    -0.02
    26   1.1390   4102.31    -0.06       3.56    -0.16
    27   1.2044   2469.96     0.00      -0.95     0.01
    28   1.3576  -1526.40    -0.03      13.31    -0.03
    29   1.4394  -2485.46     0.09      32.56     0.08
    30   2.0725  10678.02     0.00      41.69     0.04
    31   2.0863  10525.62    -0.01      39.36     0.03
    32   2.3156   4941.84     0.09      34.27    -0.04
    33   2.3158   4938.80     0.01      34.42     0.08

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.

15VG170    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        42.436    42.445    42.428
ecceobj         0.081     0.081     0.081
incobj          0.506     0.506     0.506
qmin           37.319    37.531    37.120
qmax           47.183    47.038    47.383
amean          42.117    42.126    42.108
amin           41.758    41.764    41.754
amax           42.486    42.495    42.467
emean           0.084     0.081     0.087
emin            0.051     0.048     0.054
emax            0.111     0.107     0.116
imean           2.591     2.463     2.754
imin            0.736     0.501     0.943
imax            4.050     4.000     4.100
excite_mean     0.097     0.093     0.100
fracstop        1.000     1.000     1.000
cjmean          3.068     3.069     3.067

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       172.5     180.9     174.8
kozaiamp        179.9     180.0     180.0