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: 08LC18
# Created Tue Apr 16 01:13:00 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 28 observations of 28
# Arc: 15.75y
# First observation: 2008/06/07
# Last observation: 2024/03/08
# Chi-squared of fit: 24.31 DOF: 50 RMS: 0.16
# Min/Max residuals: -0.64 0.34
# Exact a, adot, b, bdot, g, gdot:
1.432929E-05 2.995069E-02 -6.890556E-06 -1.553917E-02 3.186443E-02 7.037604E-04
# Covariance matrix:
1.7432E-13 3.5665E-15 5.9215E-15 -6.3000E-15 1.3907E-13 2.2693E-14
3.5665E-15 3.8574E-14 1.4351E-14 -1.9760E-14 8.8066E-14 8.1511E-14
5.9215E-15 1.4351E-14 1.2453E-13 -1.6687E-14 3.6050E-14 3.1171E-14
-6.3000E-15 -1.9760E-14 -1.6687E-14 1.1611E-14 -4.5670E-14 -4.3098E-14
1.3907E-13 8.8066E-14 3.6050E-14 -4.5670E-14 4.4110E-13 1.8134E-13
2.2693E-14 8.1511E-14 3.1171E-14 -4.3098E-14 1.8134E-13 1.7810E-13
# lat0 lon0 xBary yBary zBary JD0
2.884392 -96.654569 0.114633 0.050523 -1.002634 2454624.949404
# Heliocentric elements and errors
Epoch: 2454624.5000 = 2008/06/07
Mean Anomaly: 165.80441 +/- 0.019
Argument of Peri: 6.12438 +/- 0.008
Long of Asc Node: 88.52939 +/- 0.000
Inclination: 27.48388 +/- 0.000
Eccentricity: 0.07815008 +/- 0.0000
Semi-Major Axis: 30.10017935 +/- 0.0020
Time of Perihelion: 2426843.6439 +/- 4.2
Perihelion: 27.74784790 +/- 0.0024
Aphelion: 32.45251079 +/- 0.0026
Period (y) 165.1436 +/- 0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -3.86103696 +/- 0.0001
Ecliptic Y -32.12088208 +/- 0.0006
Ecliptic Z 1.57904907 +/- 0.0000
Ecliptic XDOT 0.00254765 +/- 0.0000
Ecliptic YDOT -0.00042397 +/- 0.0000
Ecliptic ZDOT -0.00133053 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 32.39060761 +/- 0.0006
Geocenter to KBO 31.38297657 +/- 0.0007
# Hcoef: 8.15
The following table shows the complete astrometric record for 08LC18. 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 (08LC18) followed by the observatory code and reference code for the source of the astrometry.
2008 06 07.44865 17 31 37.769 -20 23 28.35 23.2r 08LC18 568 C~0K8b 2008 06 07.48705 17 31 37.523 -20 23 28.40 08LC18 568 C~0K8b 2008 06 07.52545 17 31 37.257 -20 23 28.54 08LC18 568 C~0K8b 2008 07 03.99931 17 28 42.218 -20 25 29.12 08LC18 304 C~0K8b 2008 07 04.00420 17 28 42.168 -20 25 29.33 08LC18 304 C~0K8b 2008 07 09.22847 17 28 10.106 -20 26 01.25 08LC18 807 C~0Lmu 2008 08 21.99305 17 25 09.236 -20 32 36.35 08LC18 304 C~0Lmu 2008 08 22.00368 17 25 09.160 -20 32 36.77 08LC18 304 C~0Lmu 2008 08 23.03750 17 25 07.412 -20 32 48.62 08LC18 304 C~0Lmu 2009 05 23.39131 17 40 27.382 -21 20 08.58 08LC18 304 C~0Lmu 2009 06 22.31597 17 37 10.257 -21 22 32.51 08LC18 568 C~0Lmu 2009 06 22.45555 17 37 09.276 -21 22 33.64 08LC18 568 C~0Lmu 2012 07 21.32625 17 56 01.277 -24 13 13.51 08LC18 568 C~2AD7 2012 07 22.33476 17 55 55.427 -24 13 21.08 23.2r 08LC18 568 C~2AD7 2021 07 31.07873 19 06 36.879 -31 18 18.40 08LC18 304 c~5Rpc 2021 07 31.08308 19 06 36.835 -31 18 18.37 08LC18 304 c~5Rpc 2021 07 31.08728 19 06 36.819 -31 18 18.46 08LC18 304 c~5Rpc 2021 07 31.09086 19 06 36.794 -31 18 18.49 08LC18 304 c~5Rpc 2021 07 31.09421 19 06 36.775 -31 18 18.52 08LC18 304 c~5Rpc 2021 07 31.10262 19 06 36.710 -31 18 18.55 08LC18 304 c~5Rpc 2021 07 31.10580 19 06 36.692 -31 18 18.64 08LC18 304 c~5Rpc 2021 07 31.10819 19 06 36.685 -31 18 18.61 08LC18 304 c~5Rpc 2021 07 31.11058 19 06 36.668 -31 18 18.61 08LC18 304 c~5Rpc 2021 07 31.11297 19 06 36.650 -31 18 18.85 08LC18 304 c~5Rpc 2021 07 31.11535 19 06 36.636 -31 18 18.73 08LC18 304 c~5Rpc 2021 07 31.11832 19 06 36.613 -31 18 18.82 08LC18 304 c~5Rpc 2024 03 07.39990 19 38 21.260 -32 04 16.75 23.3r 08LC18 304 C~7udU 2024 03 08.40021 19 38 27.629 -32 04 27.37 23.3r 08LC18 304 C~7udU
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 0.11 0.00 -0.17
2 0.0001 0.00 0.34 0.00 -0.09
3 0.0002 0.00 0.26 0.00 -0.11
4 0.0727 0.00 0.08 0.00 0.22
5 0.0727 0.00 -0.21 0.00 0.04
6 0.0870 0.00 0.00 0.00 -0.02
7 0.2068 0.00 0.20 0.00 0.06
8 0.2069 0.00 -0.64 0.00 -0.23
9 0.2097 0.00 0.01 0.00 0.17
10 0.9581 0.00 -0.25 0.00 0.05
11 1.0400 0.00 0.18 0.00 0.12
12 1.0404 0.00 -0.21 0.00 -0.23
13 4.1201 0.00 0.33 0.00 0.17
14 4.1229 0.00 -0.35 0.00 0.09
15 13.1461 0.00 0.07 0.00 -0.06
16 13.1462 0.00 -0.16 0.00 0.02
17 13.1462 0.00 0.02 0.00 -0.02
18 13.1462 0.00 0.00 0.00 -0.00
19 13.1462 0.00 0.05 0.00 0.00
20 13.1462 0.00 -0.09 0.00 0.07
21 13.1462 0.00 -0.04 0.00 0.02
22 13.1462 0.00 0.10 0.00 0.08
23 13.1462 0.00 0.08 0.00 0.10
24 13.1462 0.00 0.05 0.00 -0.11
25 13.1462 0.00 0.07 0.00 0.04
26 13.1463 0.00 0.03 0.00 -0.02
27 15.7480 0.00 -0.07 0.00 -0.07
28 15.7507 0.00 -0.12 0.00 -0.12
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.
08LC18 quality flag:3 Type: 1:1 1:1 1:1 axisobj 29.853 29.853 29.853 ecceobj 0.086 0.086 0.086 incobj 27.587 27.587 27.587 qmin 26.815 26.815 26.814 qmax 33.513 33.513 33.514 amean 30.109 30.109 30.109 amin 29.817 29.817 29.817 amax 30.425 30.425 30.425 emean 0.081 0.081 0.081 emin 0.055 0.055 0.055 emax 0.105 0.105 0.105 imean 26.011 26.011 26.011 imin 25.797 25.797 25.797 imax 26.205 26.205 26.205 excite_mean 0.446 0.446 0.446 fracstop 1.000 1.000 1.000 cjmean 2.793 2.793 2.793 libcent 0 298.9 298.9 299.0 libamp 0 19.4 19.4 19.5 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 182.0 181.9 182.0 kozaiamp 180.0 180.0 180.0