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: 99CW118
# Created Sat Apr 20 01:09:46 2024
# Orbit generated from Bernstein formalism
# Fitting 7 observations of 7
# Arc: 86.00d
# First observation: 1999/02/10
# Last observation: 1999/05/07
Preliminary a, adot, b, bdot, g, gdot:
0.000000 0.039613 -0.000001 0.000327 0.026433 0.000000
# WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution
# Chi-squared of fit: 4.03 DOF: 9 RMS: 0.13
# Min/Max residuals: -0.24 0.26
# Exact a, adot, b, bdot, g, gdot:
1.400724E-05 2.026744E-02 -3.446661E-07 3.105158E-04 2.312558E-02 7.186673E-03
# Covariance matrix:
-1.6869E-10 -2.4778E-07 5.9448E-12 -1.9619E-10 -4.1725E-08 7.7098E-07
-2.4778E-07 -3.6237E-04 8.6962E-09 -2.8706E-07 -6.1030E-05 1.1257E-03
5.9448E-12 8.6962E-09 1.2079E-13 5.3108E-12 1.4646E-09 -2.7020E-08
-1.9619E-10 -2.8706E-07 5.3108E-12 -2.0639E-10 -4.8345E-08 8.9206E-07
-4.1725E-08 -6.1030E-05 1.4646E-09 -4.8345E-08 -1.0279E-05 1.8962E-04
7.7098E-07 1.1257E-03 -2.7020E-08 8.9206E-07 1.8962E-04 -3.4936E-03
# lat0 lon0 xBary yBary zBary JD0
0.174466 167.082295 0.428052 0.002504 -0.896289 2451219.940773
# Heliocentric elements and errors
Epoch: 2451210.5000 = 1999/02/01
Mean Anomaly: 77.89522 +/- 315.035
Argument of Peri: 255.58112 +/- 255.581
Long of Asc Node: 155.53966 +/- 155.540
Inclination: 0.89695 +/- 0.897
Eccentricity: 0.32929931 +/- 0.3293
Semi-Major Axis: 42.50698568 +/- 42.5070
Time of Perihelion: 2429307.8235 +/- 9999999.9
Perihelion: 28.50946447 +/- 31.7604
Aphelion: 56.50450689 +/- 58.2125
Period (y) 277.1397 +/- 415.71
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -42.91735891 +/- -42.9174
Ecliptic Y 10.28386145 +/- 10.2839
Ecliptic Z 0.13166087 +/- 0.1317
Ecliptic XDOT -0.00136727 +/- -0.0014
Ecliptic YDOT -0.00213956 +/- -0.0021
Ecliptic ZDOT 0.00003935 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 44.13246919 +/- 41.8044
Geocenter to KBO 43.24215726 +/- 43.2422
# Hcoef: 7.76
The following table shows the complete astrometric record for 99CW118. 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 (99CW118) followed by the observatory code and reference code for the source of the astrometry.
1999 02 10.44003 11 12 44.36 +05 15 44.6 23.8R 99CW118 568 Ca4013 1999 02 10.48103 11 12 44.20 +05 15 45.5 23.8R 99CW118 568 Ca4013 1999 02 18.56215 11 12 11.62 +05 19 13.4 23.8R 99CW118 568 Ca4013 1999 02 18.57375 11 12 11.55 +05 19 13.8 23.8R 99CW118 568 Ca4013 1999 02 18.61034 11 12 11.42 +05 19 14.6 23.8R 99CW118 568 Ca4013 1999 05 07.39647 11 07 26.39 +05 49 15.4 24.1R 99CW118 568 Ca4843 1999 05 07.43759 11 07 26.28 +05 49 15.9 24.1R 99CW118 568 Ca4843
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 -0.03 0.00 0.11
2 0.0001 -2.55 0.05 -0.10 0.02
3 0.0222 -531.72 0.09 1.99 -0.02
4 0.0223 -532.84 -0.23 1.95 -0.06
5 0.0224 -534.94 0.17 1.93 -0.07
6 0.2353 -5156.60 0.26 9.44 0.09
7 0.2354 -5158.31 -0.24 9.27 -0.07
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.
99CW118 quality flag:1 Type: CENTAURR CENTAURR REMOVED axisobj 42.612 51.778 38.485 ecceobj 0.330 0.494 0.209 incobj 0.898 0.880 0.917 qmin 28.555 25.989 30.383 qmax 58.289 78.584 46.676 amean 43.069 51.670 37.862 amin 42.612 50.909 37.190 amax 43.527 52.517 38.745 emean 0.335 0.490 0.192 emin 0.330 0.483 0.181 emax 0.339 0.498 0.209 imean 1.194 1.208 1.246 imin 1.183 1.170 1.184 imax 1.205 1.311 1.290 excite_mean 0.335 0.490 0.194 fracstop 0.000 0.024 0.000 cjmean 2.954 2.866 2.995 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 256.3 273.9 224.5 kozaiamp 0.4 5.5 2.1