Orbit Fit and Astrometric record for 15VP170

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: 15VP170   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting     31 observations of     31
# Arc:   2.27y
# First observation: 2015/09/07
#  Last observation: 2017/12/13
Preliminary a, adot, b, bdot, g, gdot:
  -0.000081   0.022985  -0.000007   0.002106   0.023410   0.000000
# Chi-squared of fit:     6.19 DOF:     56 RMS:  0.08
# Min/Max residuals:    -0.22    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.593013E-05  2.273564E-02  1.408626E-06  2.079026E-03  2.330470E-02 -2.116580E-03
# Covariance matrix:
  2.0871E-13  5.9891E-15 -9.7967E-16  1.7122E-14  1.7658E-13  5.5073E-12
  5.9891E-15  4.5974E-13 -8.9242E-15  5.8131E-14  2.9489E-13  1.8550E-11
 -9.7967E-16 -8.9242E-15  1.1088E-13 -9.8908E-14 -5.9918E-15 -5.4889E-13
  1.7122E-14  5.8131E-14 -9.8908E-14  1.5822E-13  5.2305E-14  3.4716E-12
  1.7658E-13  2.9489E-13 -5.9918E-15  5.2305E-14  3.7623E-13  1.6745E-11
  5.5073E-12  1.8550E-11 -5.4889E-13  3.4716E-12  1.6745E-11  1.1074E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -2.918588   52.583703    0.937628   -0.019112   -0.377779  2457273.125689
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          304.06803 +/-     0.122
Argument of Peri:       40.16980 +/-     0.258
Long of Asc Node:       80.46763 +/-     0.004
Inclination:             5.92723 +/-     0.001
Eccentricity:         0.13049691 +/-    0.0014
Semi-Major Axis:     46.06520221 +/-    0.0164
Time of Perihelion: 2475013.0289 +/-      37.5
Perihelion:          40.05383569 +/-    0.0667
Aphelion:            52.07656872 +/-    0.0677
Period (y)              312.6567 +/-      0.17
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           27.00867262 +/-    0.0007
Ecliptic Y           33.76706255 +/-    0.0009
Ecliptic Z           -2.18476801 +/-    0.0001
Ecliptic XDOT        -0.00226662 +/-    0.0000
Ecliptic YDOT         0.00142912 +/-    0.0000
Ecliptic ZDOT         0.00025664 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.29498956 +/-    0.0008
Geocenter to KBO     42.90979962 +/-    0.0011
# Hcoef:  8.11

The following table shows the complete astrometric record for 15VP170. 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 (15VP170) followed by the observatory code and reference code for the source of the astrometry.

2015 09  07.62490  03 23 47.948  +15 35 35.64  24.6w 15VP170   568  C~2nw6      
2015 09  12.48855  03 23 41.004  +15 34 56.49  24.9w 15VP170   568  C~2nw6      
2015 10  07.53269  03 22 34.904  +15 29 55.12  24.6w 15VP170   568  C~2nw6      
2015 10  07.59208  03 22 34.687  +15 29 54.22  25.0w 15VP170   568  C~2nw6      
2015 10  09.57195  03 22 27.554  +15 29 24.49  24.5w 15VP170   568  C~2nw6      
2015 11  06.34408  03 20 27.887  +15 21 38.63  24.3r 15VP170   568  C~2nw6      
2015 11  06.41470  03 20 27.550  +15 21 37.43  24.1r 15VP170   568  C~2nw6      
2015 11  06.48426  03 20 27.220  +15 21 36.24  24.9r 15VP170   568  C~2nw6      
2015 11  07.50182  03 20 22.371  +15 21 18.56  24.4w 15VP170   568  C~2nw6      
2015 11  17.48361  03 19 34.379  +15 18 25.77  24.8w 15VP170   568  C~2nw6      
2015 11  17.57138  03 19 33.963  +15 18 24.39  24.5w 15VP170   568  C~2nw6      
2015 12  06.34926  03 18 06.376  +15 13 28.87  24.4w 15VP170   568  C~2nw6      
2015 12  06.48675  03 18 05.778  +15 13 26.84  24.9w 15VP170   568  C~2nw6      
2015 12  31.37031  03 16 32.141  +15 08 57.02  24.7w 15VP170   568  C~2nw6      
2016 01  07.39971  03 16 13.179  +15 08 15.76  24.8w 15VP170   568  C~2nw6      
2016 02  05.29926  03 15 40.565  +15 08 39.44  24.7w 15VP170   568  C~2nw6      
2016 02  11.25262  03 15 43.639  +15 09 24.08  24.8w 15VP170   568  C~2nw6      
2016 09  07.58521  03 28 54.838  +16 01 50.80  24.5w 15VP170   568  C~2nw6      
2016 09  27.51883  03 28 14.460  +15 58 38.30  25.1w 15VP170   568  C~2nw6      
2016 09  29.49637  03 28 08.717  +15 58 13.72  24.3w 15VP170   568  C~2nw6      
2016 10  05.49953  03 27 49.545  +15 56 53.84  24.8w 15VP170   568  C~2nw6      
2016 10  07.50403  03 27 42.599  +15 56 25.69  24.7w 15VP170   568  C~2nw6      
2016 10  07.59973  03 27 42.240  +15 56 24.26  25.0w 15VP170   568  C~2nw6      
2016 10  09.50422  03 27 35.405  +15 55 56.62  25.0w 15VP170   568  C~2nw6      
2016 10  09.57681  03 27 35.138  +15 55 55.70  24.5w 15VP170   568  C~2nw6      
2016 11  02.49102  03 25 53.503  +15 49 30.33  24.4w 15VP170   568  C~2nw6      
2016 11  04.46713  03 25 44.181  +15 48 56.62  24.3w 15VP170   568  C~2nw6      
2016 12  28.44224  03 21 46.229  +15 36 19.36  24.8w 15VP170   568  C~2nw6      
2016 12  28.45409  03 21 46.211  +15 36 19.29  24.6w 15VP170   568  C~2nw6      
2017 01  27.30860  03 20 45.895  +15 34 54.11  24.7w 15VP170   568  C~2nw6      
2017 12  13.36708  03 27 55.238  +16 05 45.62  24.7w 15VP170   568  C~2nw6      

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     0.00
     2   0.0133   -106.94    -0.02     -12.72     0.04
     3   0.0819  -1107.31     0.04     -63.97     0.05
     4   0.0820  -1110.57     0.01     -64.05     0.04
     5   0.0875  -1217.84     0.01     -66.79     0.03
     6   0.1635  -3009.96    -0.18     -78.68    -0.12
     7   0.1637  -3014.98    -0.12     -78.60    -0.11
     8   0.1639  -3019.90    -0.02     -78.53    -0.10
     9   0.1667  -3092.25    -0.03     -77.76     0.05
    10   0.1940  -3807.82    -0.07     -67.63    -0.02
    11   0.1942  -3813.99     0.14     -67.43     0.06
    12   0.2457  -5115.45    -0.04     -27.96     0.11
    13   0.2460  -5124.34     0.20     -27.69    -0.04
    14   0.3142  -6504.65    -0.07      61.65     0.02
    15   0.3334  -6780.80     0.10      92.99    -0.01
    16   0.4125  -7231.20    -0.02     238.58    -0.02
    17   0.4288  -7176.55     0.09     270.13     0.05
    18   1.0019   4682.23    -0.01     427.62     0.03
    19   1.0565   4070.31     0.09     383.87    -0.06
    20   1.0619   3983.96     0.13     380.40    -0.05
    21   1.0784   3696.21     0.07     371.03    -0.08
    22   1.0839   3592.15     0.10     368.42     0.02
    23   1.0841   3586.78    -0.10     368.31     0.01
    24   1.0893   3484.39    -0.07     365.83    -0.10
    25   1.0895   3480.43     0.03     365.88     0.02
    26   1.1550   1964.04     0.02     355.50     0.03
    27   1.1604   1825.34     0.02     356.29    -0.04
    28   1.3082  -1690.77    -0.22     485.61     0.12
    29   1.3082  -1691.03     0.08     485.60     0.07
    30   1.3900  -2555.66     0.04     624.40     0.02
    31   2.2662   3906.79    -0.11     866.32    -0.02

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.

15VP170    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        46.495    46.532    46.460
ecceobj         0.130     0.134     0.127
incobj          5.919     5.919     5.918
qmin           39.238    39.164    39.348
qmax           53.302    53.530    53.114
amean          46.118    46.154    46.084
amin           45.725    45.770    45.698
amax           46.554    46.588    46.520
emean           0.132     0.136     0.129
emin            0.119     0.123     0.115
emax            0.145     0.149     0.143
imean           4.389     4.393     4.386
imin            3.857     3.855     3.865
imax            4.942     4.965     4.921
excite_mean     0.153     0.156     0.150
fracstop        1.000     1.000     1.000
cjmean          3.099     3.098     3.100

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       172.2     172.2     172.0
kozaiamp        180.0     180.0     180.0