Orbit Fit and Astrometric record for 08HY21

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: 08HY21    
# Created Mon Dec 18 02:37:32 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   66 observations of   68
# Arc:   7.73y
# First observation: 2004/12/15
#  Last observation: 2012/09/07
# Chi-squared of fit:   310.61 DOF:  126 RMS:  0.38
# Min/Max residuals:    -2.07    1.33
# Exact a, adot, b, bdot, g, gdot:
  3.937709E-05  3.535889E-01 -1.431666E-08  2.462070E-03  1.425617E-01 -1.180130E-01
# Covariance matrix:
  4.2743E-12 -1.3045E-12 -9.5841E-12  2.8319E-12  8.0095E-16 -9.4303E-16
 -1.3045E-12  5.3965E-09  2.9194E-12 -3.7025E-09 -2.4317E-16  8.1056E-11
 -9.5841E-12  2.9194E-12  2.6261E-11 -7.7343E-12 -2.1376E-15  2.0105E-15
  2.8319E-12 -3.7025E-09 -7.7343E-12  3.6661E-09  6.2904E-16 -6.4280E-11
  8.0095E-16 -2.4317E-16 -2.1376E-15  6.2904E-16  1.7864E-19 -1.5396E-19
 -9.4303E-16  8.1056E-11  2.0105E-15 -6.4280E-11 -1.5396E-19  1.4075E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   12.836915  142.761931    0.846572    0.111676   -0.489622  2453354.889471
# Heliocentric elements and errors
Epoch:              2453354.5000  =  2004/12/15
Mean Anomaly:          330.79379 +/-     0.000
Argument of Peri:      164.02822 +/-     0.000
Long of Asc Node:       53.36086 +/-     0.000
Inclination:            11.99388 +/-     0.000
Eccentricity:         0.50674388 +/-    0.0000
Semi-Major Axis:     10.96996485 +/-    0.0000
Time of Perihelion: 2454431.1609 +/-       0.0
Perihelion:           5.41100230 +/-    0.0000
Aphelion:            16.52892739 +/-    0.0000
Period (y)               36.3342 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           -5.33685216 +/-    0.0000
Ecliptic Y            5.11665956 +/-    0.0000
Ecliptic Z            1.55846020 +/-    0.0000
Ecliptic XDOT        -0.00234234 +/-    0.0000
Ecliptic YDOT        -0.00675693 +/-    0.0000
Ecliptic ZDOT        -0.00045736 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO    7.55597820 +/-    0.0000
Geocenter to KBO      7.01462482 +/-    0.0000
# Hcoef: 12.16

The following table shows the complete astrometric record for 08HY21. 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 (08HY21) followed by the observatory code and reference code for the source of the astrometry.

2004 12  15.388728 09 58 56.60   +26 00 37.2   21.3V 08HY21    645  C~1Sgh      
2004 12  15.389557 09 58 56.60   +26 00 37.3   21.0V 08HY21    645  C~1Sgh      
2004 12  15.392045 09 58 56.59   +26 00 37.5   22.2V 08HY21    645  C~1Sgh      
2007 04  08.39426  13 11 15.17   +02 06 39.2   19.7R 08HY21    644  Cz0359      
2007 04  08.41461  13 11 14.67   +02 06 40.5   19.8R 08HY21    644  Cz0359      
2007 04  08.43497  13 11 14.13   +02 06 42.2   19.5R 08HY21    644  Cz0359      
2007 04  26.16914  13 03 58.42   +02 24 33.6   19.7V 08HY21    G96  Cz0359      
2007 04  26.17470  13 03 58.28   +02 24 33.8   19.4V 08HY21    G96  Cz0359      
2007 04  26.18031  13 03 58.17   +02 24 34.0   19.6V 08HY21    G96  Cz0359      
2007 04  26.18585  13 03 58.03   +02 24 34.2   19.5V 08HY21    G96  Cz0359      
2008 02  12.51428  15 34 49.33   -17 27 16.8   20.0V 08HY21    G96  Cz0359      
2008 02  12.52042  15 34 49.51   -17 27 17.7   19.9V 08HY21    G96  Cz0359      
2008 02  12.52659  15 34 49.65   -17 27 18.6   19.9V 08HY21    G96  Cz0359      
2008 02  12.53270  15 34 49.80   -17 27 19.4   19.8V 08HY21    G96  Cz0359      
2008 04  01.46740  15 40 23.21   -18 38 59.7   19.6V 08HY21    691  Cz0359      
2008 04  01.48502  15 40 23.00   -18 39 00.4   19.9V 08HY21    691  Cz0359      
2008 04  01.50265  15 40 22.81   -18 39 01.0   19.6V 08HY21    691  Cz0359      
2008 04  05.45045  15 39 33.98   -18 41 24.2   19.7V 08HY21    691  Cz0359      
2008 04  05.46807  15 39 33.69   -18 41 24.3   19.7V 08HY21    691  Cz0359      
2008 04  05.48571  15 39 33.49   -18 41 24.6   19.5V 08HY21    691  Cz0359      
2008 04  09.46061  15 38 33.96   -18 43 21.6   19.9V 08HY21    691  Cz0359      
2008 04  09.47825  15 38 33.65   -18 43 22.0   19.7V 08HY21    691  Cz0359      
2008 04  09.49353  15 38 33.41   -18 43 22.7   19.7V 08HY21    691  Cz0359      
2008 04  14.43103  15 37 06.22   -18 45 10.6   19.5V 08HY21    691  Cz0359      
2008 04  14.44865  15 37 05.88   -18 45 10.9   19.6V 08HY21    691  Cz0359      
2008 04  14.46626  15 37 05.53   -18 45 11.1   19.6V 08HY21    691  Cz0359      
2008 04  26.41479  15 32 43.69   -18 47 03.6   19.1V 08HY21    G96  Cy8251      
2008 04  26.42049  15 32 43.54   -18 47 04.0   19.2V 08HY21    G96  Cy8251      
2008 04  26.42612  15 32 43.36   -18 47 04.0   19.2V 08HY21    G96  Cy8251      
2008 04  26.43178  15 32 43.22   -18 47 04.0   19.2V 08HY21    G96  Cy8251      
2008 04  28.36922  15 31 55.39   -18 47 05.2   19.6V 08HY21    691  Cy8251      
2008 04  28.38684  15 31 54.91   -18 47 04.7   19.5V 08HY21    691  Cy8251      
2008 04  28.40446  15 31 54.45   -18 47 04.7   19.6V 08HY21    691  Cy8251      
2008 05  02.38723  15 30 12.36   -18 46 54.2   19.4V 08HY21    691  Cz0359      
2008 05  02.40489  15 30 11.87   -18 46 54.1   19.5V 08HY21    691  Cz0359      
2008 05  02.42345  15 30 11.34   -18 46 53.9   20.1V 08HY21    691  Cz0359      
2008 05  04.25548  15 29 23.18   -18 46 43.9         08HY21    691  Cz0359      
2008 05  04.27314  15 29 22.70   -18 46 43.9         08HY21    691  Cz0359      
2008 05  04.29081  15 29 22.21   -18 46 43.9         08HY21    691  Cz0359      
2008 05  05.34877  15 28 53.87   -18 46 36.6   18.4C 08HY21    704  C~07I9      
2008 05  05.35893  15 28 53.71   -18 46 36.1   18.3C 08HY21    704  C~07I9      
2008 05  05.36914  15 28 53.54   -18 46 36.2   18.4C 08HY21    704  C~07I9      
2008 05  05.37942  15 28 53.26   -18 46 36.3   18.7C 08HY21    704  C~07I9      
2008 05  06.37258  15 28 26.40   -18 46 29.8   19.2V 08HY21    691  Cz0359      
2008 05  06.39027  15 28 25.91   -18 46 29.6   19.3V 08HY21    691  Cz0359      
2008 05  06.41144  15 28 25.34   -18 46 28.7   19.5V 08HY21    691  Cz0359      
2008 05  26.19260  15 19 29.92   -18 42 52.7         08HY21    291  Cz0606      
2008 05  26.20159  15 19 29.68   -18 42 52.5         08HY21    291  Cz0606      
2008 05  26.21078  15 19 29.43   -18 42 52.7         08HY21    291  Cz0606      
2008 05  27.23554  15 19 03.00   -18 42 42.3   19.6V 08HY21    291  Cz0606      
2008 05  27.24456  15 19 02.77   -18 42 42.3   19.5V 08HY21    291  Cz0606      
2008 05  27.25370  15 19 02.51   -18 42 42.7   19.4V 08HY21    291  Cz0606      
2008 05  30.27527  15 17 46.32   -18 42 14.7   19.3V 08HY21    G96  Cz0606      
2008 05  30.28134  15 17 46.17   -18 42 14.7   19.2V 08HY21    G96  Cz0606      
2008 05  30.28747  15 17 46.03   -18 42 14.6   19.1V 08HY21    G96  Cz0606      
2008 05  30.29348  15 17 45.85   -18 42 14.5   19.2V 08HY21    G96  Cz0606      
2008 06  09.23738  15 13 58.42   -18 41 40.9   19.7V 08HY21    691  Cz1434      
2008 06  09.25504  15 13 58.07   -18 41 41.0   19.7V 08HY21    691  Cz1434      
2008 06  09.27618  15 13 57.63   -18 41 39.9   19.5V 08HY21    691  Cz1434      
2008 06  10.27219  15 13 37.20   -18 41 43.8   19.9V 08HY21    291  Cz1434      
2008 06  10.28372  15 13 37.00   -18 41 43.4   19.9V 08HY21    291  Cz1434      
2008 06  10.29491  15 13 36.74   -18 41 43.9   20.1V 08HY21    291  Cz1434      
2008 06  11.20213  15 13 18.69   -18 41 47.6   20.0V 08HY21    291  Cz1434      
2008 06  11.21114  15 13 18.51   -18 41 47.6   20.0V 08HY21    291  Cz1434      
2008 06  11.22041  15 13 18.31   -18 41 47.7   20.0V 08HY21    291  Cz1434      
2012 09  07.52641  21 58 20.34   -26 32 02.2   20.6R 08HY21    E10  C~0iZU      
2012 09  07.53594  21 58 20.17   -26 32 03.0   21.4R 08HY21    E10  C~0iZU      
2012 09  07.65524  21 58 17.96   -26 32 09.4   21.3R 08HY21    E10  C~0iZU      

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    -0.77       0.00    -2.07
  2   0.0000      0.00     0.05       0.00    -0.02
  3   0.0000      0.00    -0.01       0.00    -0.11
  4   2.3108      0.00     0.37       0.00     0.84
  5   2.3108      0.00     0.77       0.00     0.43
  6   2.3109      0.00     0.57       0.00     0.42
  7   2.3594      0.00     0.21       0.00    -0.28
  8   2.3594      0.00     0.07       0.00    -0.26
  9   2.3595      0.00     0.39       0.00    -0.24
 10   2.3595      0.00     0.24       0.00    -0.22
 11   3.1598      0.00    -0.55       0.00     0.08
 12   3.1598      0.00    -0.02       0.00     0.04
 13   3.1599      0.00    -0.10       0.00    -0.01
 14   3.1599      0.00    -0.00       0.00     0.04
 15   3.2938      0.00    -0.05       0.00     0.04
 16   3.2939      0.00    -0.10       0.00     0.02
 17   3.2939      0.00     0.14       0.00     0.11
 18   3.3048      0.00     0.10       0.00     0.12
 19   3.3048      0.00    -0.45       0.00     0.58
 20   3.3049      0.00     0.35       0.00     0.84
 21   3.3157      0.00     0.13       0.00     0.19
 22   3.3158      0.00    -0.05       0.00     0.22
 23   3.3158      0.00     0.22       0.00    -0.10
 24   3.3293      0.00     0.13       0.00     0.02
 25   3.3294      0.00     0.25       0.00     0.02
 26   3.3294      0.00     0.21       0.00     0.11
 27   3.3622      0.00     0.50       0.00     0.21
 28   3.3622      0.00     0.40       0.00    -0.18
 29   3.3622      0.00    -0.19       0.00    -0.18
 30   3.3622      0.00    -0.16       0.00    -0.18
 31   3.3675      0.00     0.62       0.00    -0.38
 32   3.3676      0.00     0.23       0.00     0.10
 33   3.3676      0.00     0.14       0.00     0.08
 34   3.3785      0.00     0.49       0.00    -0.10
 35   3.3786      0.00     0.25       0.00    -0.10
 36   3.3786      0.00    -0.23       0.00    -0.01
 37   3.3836      0.00     0.55       0.00     0.01
 38   3.3837      0.00     0.56       0.00    -0.07
 39   3.3837      0.00     0.44       0.00    -0.16
 40   3.3866      0.00    -0.45       0.00     0.15
 41   3.3866      0.00     1.33       0.00     0.57
 42   3.3867      0.00 (   2.99)      0.00 (   0.38)
 43   3.3867      0.00 (   3.03)      0.00 (   0.20)
 44   3.3894      0.00     0.16       0.00    -0.72
 45   3.3895      0.00     0.14       0.00    -0.67
 46   3.3895      0.00     0.36       0.00     0.03
 47   3.4437      0.00     0.46       0.00    -0.13
 48   3.4437      0.00     0.44       0.00    -0.01
 49   3.4437      0.00     0.35       0.00    -0.29
 50   3.4465      0.00     0.32       0.00    -0.20
 51   3.4466      0.00     0.44       0.00    -0.29
 52   3.4466      0.00     0.15       0.00    -0.78
 53   3.4549      0.00     0.21       0.00     0.16
 54   3.4549      0.00     0.28       0.00     0.11
 55   3.4549      0.00     0.52       0.00     0.15
 56   3.4549      0.00     0.12       0.00     0.20
 57   3.4821      0.00     0.03       0.00    -0.16
 58   3.4822      0.00     0.46       0.00    -0.23
 59   3.4822      0.00     0.65       0.00     0.90
 60   3.4850      0.00    -0.15       0.00    -0.15
 61   3.4850      0.00     0.46       0.00     0.27
 62   3.4850      0.00     0.06       0.00    -0.20
 63   3.4875      0.00     0.20       0.00    -0.06
 64   3.4875      0.00     0.26       0.00    -0.02
 65   3.4876      0.00     0.11       0.00    -0.07
 66   7.7293      0.00    -0.07       0.00     0.68
 67   7.7294      0.00     0.06       0.00     0.37
 68   7.7297      0.00     0.33       0.00     0.01

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.

08HY21    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        10.916    10.916    10.916
ecceobj         0.502     0.502     0.502
incobj         12.000    12.000    12.000
qmin            5.347     5.339     5.353
qmax           16.799    17.433    21.616
amean          10.913    10.972    11.305
amin           10.650    10.670    10.623
amax           11.114    11.390    13.502
emean           0.503     0.507     0.515
emin            0.498     0.498     0.496
emax            0.512     0.531     0.601
imean          11.125    11.143    10.528
imin           10.990    10.990     9.005
imax           11.249    11.358    11.202
excite_mean     0.539     0.543     0.547
fracstop        0.000     0.000     0.001
cjmean          3.780     3.765     3.704

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       169.5     168.8     202.9
kozaiamp         10.3       8.9      56.9