C/2005 E2 McNaught
more info
Comet C/2005 E2 was discovered on 12 March 2005 by Robert H. McNaught (Siding Spring); that is about 11 months before its perihelion passage. It was observed until 3 March 2008 (see picture).
Comet had its closest approach to the Earth on 30 August 2005 (2.006 au), about 5.5 months after its discovery.
Solutions given here are based on data spanning over 2.98 yr in a range of heliocentric distances: 4.42 au – 1.582 au (perihelion) – 7.76 au.
This Oort spike comet suffers notable planetary perturbations during its passage through the planetary system; these perturbations lead to escape the comet from the planetary zone on a hyperbolic orbit with future eccentricity of 1.0040 (see future barycentric orbits).
See also Królikowska 2020

solution description
number of observations 1361
data interval 2005 03 12 – 2008 03 03
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 4.42 au – 1.52 au (perihelion) – 7.76 au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 2677
RMS [arcseconds] 0.44
orbit quality class 1a
orbital elements (heliocentric ecliptic J2000)
Epoch 2006 03 06
perihelion date 2006 02 23.47615575 ± 0.00004868
perihelion distance [au] 1.51959637 ± 0.00000052
eccentricity 1.00016548 ± 0.00000182
argument of perihelion [°] 39.967903 ± 0.000032
ascending node [°] 347.848096 ± 0.000028
inclination [°] 16.988665 ± 0.000011
recip semi-major axis [10-6 au-1] -108.90 ± 1.20
Time distribution of positional observations with corresponding heliocentric (red curve) and geocentric (green curve) distance at which they were taken. The horizontal dotted line shows the perihelion distance for a given comet whereas vertical dotted line – the moment of perihelion passage
non-gravitational parameters
A1 [10-8au/day2] -0.44847 ± 0.03572
A2 [10-8au/day2] -0.048658 ± 0.033869
A3 [10-8au/day2] 0.30138 ± 0.00498
m -2.15
n 5.093
k -4.6142
r0 [au] 2.808
α 0.1113