Orbit Fit and Astrometric record for 15DW249

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: 15DW249   
# Created Sat Nov 27 02:13:20 2021
# Orbit generated from Bernstein formalism
# Fitting     26 observations of     26
# Arc:  33.87d
# First observation: 2015/02/17
#  Last observation: 2015/03/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000001   0.037725   0.000003   0.004096   0.029276   0.000000
# Chi-squared of fit:    11.38 DOF:     46 RMS:  0.12
# Min/Max residuals:    -0.21    0.31
# Exact a, adot, b, bdot, g, gdot:
  1.846240E-05  3.213577E-02  3.068844E-06  4.288601E-03  2.841736E-02 -1.798602E-03
# Covariance matrix:
  2.5774E-13  1.4539E-10  4.7117E-14 -4.7874E-12  2.3890E-11  3.9446E-11
  1.4539E-10  3.4068E-07  1.1101E-10 -1.1759E-08  5.2039E-08 -1.4774E-06
  4.7117E-14  1.1101E-10  1.8358E-13 -5.6961E-12  1.6933E-11 -4.9408E-10
 -4.7874E-12 -1.1759E-08 -5.6961E-12  4.4587E-10 -1.7876E-09  5.5297E-08
  2.3890E-11  5.2039E-08  1.6933E-11 -1.7876E-09  7.9915E-09 -2.0545E-07
  3.9446E-11 -1.4774E-06 -4.9408E-10  5.5297E-08 -2.0545E-07  1.6252E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
  -12.990086  155.244396    0.124980   -0.219495   -0.952304  2457070.736578
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          347.51565 +/-    23.075
Argument of Peri:      319.76992 +/-    36.765
Long of Asc Node:      213.78230 +/-     0.497
Inclination:            14.70100 +/-     0.075
Eccentricity:         0.20819495 +/-    0.0714
Semi-Major Axis:     45.20564851 +/-    2.3408
Time of Perihelion: 2460920.4140 +/-    7109.7
Perihelion:          35.79406094 +/-    3.7224
Aphelion:            54.61723608 +/-    4.2917
Period (y)              303.9466 +/-     23.61
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -31.97655480 +/-    0.0979
Ecliptic Y           14.88130566 +/-    0.0452
Ecliptic Z           -7.90997616 +/-    0.0249
Ecliptic XDOT        -0.00123115 +/-    0.0003
Ecliptic YDOT        -0.00284896 +/-    0.0002
Ecliptic ZDOT         0.00044165 +/-    0.0001
# Distances at JD0 (AU)
Heliocenter to KBO   36.14583016 +/-    0.0888
Geocenter to KBO     35.18975645 +/-    0.1107
# Hcoef:  7.62

The following table shows the complete astrometric record for 15DW249. 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 (15DW249) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.23580  10 09 21.60   -02 31 03.7   23.7g 15DW249   W84  C~2iOW      
2015 02  17.30445  10 09 21.25   -02 31 01.7   23.7g 15DW249   W84  C~2iOW      
2015 02  17.35153  10 09 21.00   -02 31 00.0   23.4g 15DW249   W84  C~2iOW      
2015 02  18.07910  10 09 17.27   -02 30 38.7   23.9g 15DW249   W84  C~2iOW      
2015 02  18.21462  10 09 16.53   -02 30 34.7   23.5g 15DW249   W84  C~2iOW      
2015 02  18.28477  10 09 16.18   -02 30 32.7   23.7g 15DW249   W84  C~2iOW      
2015 02  18.35376  10 09 15.80   -02 30 30.4   23.9g 15DW249   W84  C~2iOW      
2015 02  19.35086  10 09 10.65   -02 30 00.8         15DW249   W84  C~2iOW      
2015 02  22.06830  10 08 56.58   -02 28 36.9         15DW249   W84  C~2iOW      
2015 02  22.13567  10 08 56.25   -02 28 34.9         15DW249   W84  C~2iOW      
2015 02  22.20383  10 08 55.87   -02 28 32.6         15DW249   W84  C~2iOW      
2015 03  14.044734 10 07 16.95   -02 17 07.3   22.8i 15DW249   W84  C~4UG9      
2015 03  14.126296 10 07 16.56   -02 17 04.3   22.9r 15DW249   W84  C~4UG9      
2015 03  14.180116 10 07 16.30   -02 17 02.4   23.2g 15DW249   W84  C~4UG9      
2015 03  19.068310 10 06 54.07   -02 14 00.9         15DW249   W84  C~4UG9      
2015 03  19.072095 10 06 54.05   -02 14 01.0         15DW249   W84  C~4UG9      
2015 03  19.075914 10 06 54.02   -02 14 00.8         15DW249   W84  C~4UG9      
2015 03  19.079699 10 06 54.01   -02 14 00.6         15DW249   W84  C~4UG9      
2015 03  19.091667 10 06 53.96   -02 14 00.1         15DW249   W84  C~4UG9      
2015 03  19.097766 10 06 53.94   -02 13 59.9         15DW249   W84  C~4UG9      
2015 03  19.103889 10 06 53.90   -02 13 59.6         15DW249   W84  C~4UG9      
2015 03  19.109988 10 06 53.87   -02 13 59.4         15DW249   W84  C~4UG9      
2015 03  23.065405 10 06 36.81   -02 11 31.0         15DW249   W84  C~4UG9      
2015 03  23.080602 10 06 36.77   -02 11 30.6         15DW249   W84  C~4UG9      
2015 03  23.085556 10 06 36.73   -02 11 30.3         15DW249   W84  C~4UG9      
2015 03  23.110046 10 06 36.62   -02 11 29.6         15DW249   W84  C~4UG9      

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    -0.12       0.00    -0.14
     2   0.0002     -5.61     0.04      -0.03    -0.09
     3   0.0003     -9.72    -0.12       0.20     0.19
     4   0.0023    -69.54     0.18      -0.15     0.11
     5   0.0027    -81.32    -0.18      -0.43    -0.05
     6   0.0029    -86.94     0.12      -0.47    -0.03
     7   0.0031    -93.08    -0.21      -0.38     0.10
     8   0.0058   -175.73     0.16      -0.69    -0.12
     9   0.0132   -402.66    -0.06       1.28    -0.03
    10   0.0134   -407.99     0.31       1.36    -0.01
    11   0.0136   -414.13    -0.05       1.44     0.03
    12   0.0679  -2044.22     0.00     103.97     0.15
    13   0.0681  -2050.76    -0.03     104.65     0.14
    14   0.0683  -2055.08    -0.05     105.01     0.04
    15   0.0817  -2431.42     0.03     153.61     0.08
    16   0.0817  -2431.66     0.08     153.41    -0.16
    17   0.0817  -2432.15    -0.12     153.43    -0.18
    18   0.0817  -2432.37    -0.04     153.56    -0.09
    19   0.0817  -2433.25    -0.01     153.76    -0.02
    20   0.0818  -2433.60     0.11     153.83    -0.00
    21   0.0818  -2434.27    -0.09     153.90    -0.00
    22   0.0818  -2434.76    -0.11     153.92    -0.04
    23   0.0926  -2726.89    -0.12     199.69     0.10
    24   0.0927  -2727.59     0.29     199.85     0.08
    25   0.0927  -2728.26    -0.01     199.91     0.08
    26   0.0927  -2730.05    -0.00     199.97    -0.15

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.

15DW249    quality flag:1

Type:       SCATEXTD  CENTAURR  SCATEXTD

axisobj        44.847    60.171    40.784
ecceobj         0.201     0.511     0.110
incobj         14.711    14.601    14.959
qmin           35.005    28.832    35.456
qmax           55.142    94.398    46.428
amean          44.874    60.584    40.823
amin           44.450    59.650    40.489
amax           45.344    61.870    41.173
emean           0.200     0.515     0.109
emin            0.183     0.505     0.092
emax            0.218     0.528     0.129
imean          15.582    15.111    16.505
imin           14.816    14.903    15.361
imax           16.333    15.284    17.453
excite_mean     0.335     0.578     0.304
fracstop        1.000     0.020     1.000
cjmean          2.975     2.849     2.956

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       176.0      11.4     181.4
kozaiamp        180.0       7.4     179.9