Solar System
Dynamics &
Planetology
Group 		C/2005 E2 McNaught


SSDP Cometary Note C2005E2A5-001

Comet C/2005 E2 McNaught

number of observations 1364
number of residuals 2691
data interval 2005 Mar. 12 — 2008 Mar. 3
rms [arcsec] 0.65
orbit quality class 1a+

Osculating orbital elements (heliocentric; ecliptic J2000.0)

Epoch (TT) 20060531.0 = JD 2453886.5
time of perihelion passage (TT) 20060223.472800 ± 0.000058
perihelion distance 1.51957158 ± 0.00000047
eccentricity 1.00013668 ± 0.00000117
argument of perihelion [deg] 39.966307 ± 0.000033
longitude of the ascending node [deg] 347.846942 ± 0.000032
inclination [deg] 16.988159 ± 0.000009
inverse semimajor axis [10-6 au-1] -89.94 ± 0.77

Note: Epoch is given in a format: yyyymmdd.d, time of perihelion passage in a format of yyyymmdd.dddddd.

Original orbital elements (barycentric; at 250 au from the Sun)

Epoch (TT) 17061120
time of perihelion passage (TT) 20060223.457894 ± 0.000064
perihelion distance 1.52138713 ± 0.00000050
eccentricity 0.99996876 ± 0.00000116
argument of perihelion [deg] 39.858883 ± 0.000033
longitude of the ascending node [deg] 347.977213 ± 0.000032
inclination [deg] 16.989868 ± 0.000009
inverse semimajor axis [10-6 au-1] 20.54 ± 0.76

Note: Values of uncertainties of original/future orbital elements were derived using a swarm of 5001 osculating orbits of VCs (including the nominal osculating orbit given above) for original/future orbital evolution calclulations and then by fitting the distribution of a given orbital element of original/future swarm of VCs to Gaussian distribution.

Original barycentric positions and velocities of 5001 VCs at 250 au from the Sun are given here   (data format), i.e. before entering the planetary zone.

Future orbital elements (barycentric; at 250 au from the Sun)

Epoch (TT) 22801110
time of perihelion passage (TT) 20060220.925321 ± 0.000048
perihelion distance 1.58157967 ± 0.00000112
eccentricity 1.00398651 ± 0.00000115
argument of perihelion [deg] 41.187815 ± 0.000032
longitude of the ascending node [deg] 347.820742 ± 0.000031
inclination [deg] 16.868082 ± 0.000014
inverse semimajor axis [10-6 au-1] -2520.59 ± 0.73


Future barycentric positions and velocities of 5001 VCs at 250 au from the Sun are given here   (data format), i.e. after leaving the planetary zone.





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