Orbit Fit and Astrometric record for 15AN304

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: 15AN304   
# Created Sat Nov 27 02:13:16 2021
# Orbit generated from Bernstein formalism
# Fitting      9 observations of      9
# Arc:   2.93y
# First observation: 2015/01/09
#  Last observation: 2017/12/14
Preliminary a, adot, b, bdot, g, gdot:
   0.000015   0.029018   0.000028  -0.010907   0.025739   0.000000
# Chi-squared of fit:     5.70 DOF:     12 RMS:  0.14
# Min/Max residuals:    -0.27    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.987471E-05  2.902289E-02 -7.392533E-06 -1.098470E-02  2.449673E-02  4.613276E-03
# Covariance matrix:
  6.6002E-13 -7.1091E-13 -1.0261E-13  1.9276E-13 -2.5229E-13 -5.9059E-12
 -7.1091E-13  3.7021E-12  1.1881E-13 -1.5754E-12 -8.3528E-13  4.2591E-11
 -1.0261E-13  1.1881E-13  4.8501E-13 -2.7124E-13  1.6977E-13  1.4813E-12
  1.9276E-13 -1.5754E-12 -2.7124E-13  9.0385E-13  4.2782E-13 -1.9112E-11
 -2.5229E-13 -8.3528E-13  1.6977E-13  4.2782E-13  1.0400E-12 -9.9719E-12
 -5.9059E-12  4.2591E-11  1.4813E-12 -1.9112E-11 -9.9719E-12  5.1700E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -25.355925   11.081527   -0.974340    0.051553    0.108322  2457031.569718
# Heliocentric elements and errors
Epoch:              2457030.5000  =  2015/01/08
Mean Anomaly:            3.07082 +/-     0.014
Argument of Peri:      210.34209 +/-     0.085
Long of Asc Node:      143.20469 +/-     0.002
Inclination:            32.04792 +/-     0.001
Eccentricity:         0.69884893 +/-    0.0008
Semi-Major Axis:    130.54847034 +/-    0.2950
Time of Perihelion: 2452383.1298 +/-      14.7
Perihelion:          39.31481117 +/-    0.1323
Aphelion:           221.78212950 +/-    0.5106
Period (y)             1491.6464 +/-      5.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           35.89324838 +/-    0.0015
Ecliptic Y            8.02501230 +/-    0.0003
Ecliptic Z          -17.48185791 +/-    0.0007
Ecliptic XDOT        -0.00068609 +/-    0.0000
Ecliptic YDOT         0.00316645 +/-    0.0000
Ecliptic ZDOT        -0.00133013 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.72273883 +/-    0.0014
Geocenter to KBO     40.82178211 +/-    0.0017
# Hcoef:  7.81

The following table shows the complete astrometric record for 15AN304. 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 (15AN304) followed by the observatory code and reference code for the source of the astrometry.

2015 01  09.06894  01 21 34.600  -18 53 37.22  24.2r 15AN304   W84  C~55Td      
2015 01  12.07447  01 21 37.596  -18 51 35.09  24.4r 15AN304   W84  C~55Td      
2015 10  07.21811  01 33 37.006  -18 51 34.13  24.2r 15AN304   W84  C~55Td      
2015 10  18.24625  01 32 46.793  -18 57 14.92  23.5r 15AN304   W84  C~55Td      
2015 11  05.18727  01 31 26.060  -19 03 11.80  23.8r 15AN304   W84  C~55Td      
2016 10  05.26297  01 41 13.456  -18 41 44.14  23.1i 15AN304   W84  C~55Td      
2016 11  05.26727  01 38 53.540  -18 54 32.32  24.0r 15AN304   W84  C~55Td      
2016 12  05.17107  01 37 04.723  -18 54 05.14  23.6r 15AN304   W84  C~55Td      
2017 12  14.13546  01 44 04.808  -18 42 05.45  24.3r 15AN304   W84  C~55Td      

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    -0.24       0.00     0.06
     2   0.0082     89.13     0.26      93.70     0.10
     3   0.7424   9362.93    -0.05   -4201.40     0.17
     4   0.7726   8571.43     0.03   -4204.51    -0.07
     5   0.8217   7381.44     0.12   -4038.80    -0.27
     6   1.7391  15488.41    -0.10   -6485.82     0.09
     7   1.8240  13353.95     0.00   -6307.58    -0.17
     8   1.9058  11967.86    -0.14   -5610.39    -0.05
     9   2.9297  17682.89     0.12   -7582.55     0.13

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.

15AN304    quality flag:2

Type:       SCATNEAR  SCATNEAR9:1EEEEEEE

axisobj       135.097   136.136   134.089
ecceobj         0.709     0.711     0.707
incobj         31.991    31.992    31.989
qmin           36.897    36.782    38.203
qmax          234.103   237.378   230.484
amean         131.402   132.844   130.277
amin          128.492   129.762   127.493
amax          136.208   137.724   134.933
emean           0.706     0.710     0.696
emin            0.692     0.696     0.684
emax            0.719     0.724     0.708
imean          29.918    29.884    30.975
imin           29.346    29.248    30.382
imax           31.065    31.084    31.695
excite_mean     0.865     0.867     0.866
fracstop        1.000     1.000     1.000
cjmean          2.792     2.791     2.793

libcent 0      -180.0    -180.0      81.7
libamp  0      -180.0    -180.0      60.1
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       245.3     245.1     224.1
kozaiamp         35.2      36.1      14.4