C/2002 E2 Snyder-Murakami
more info
Comet C/2002 E2 was discovered on 11 March 2002 by Douglas Snyder (Arizona, US) and Shigeki Murakami (Niigata, Japan), that is about 3 weeks after its perihelion passage. Some earlier images of this comet were next found in Klet Observatory (Czech Republic), Ondřejov Observatory (Czech Republic) and Saku Observatory (Japan), expanding data-arc back in time to 8 March. It was observed until 8 January 2003.
Comet had its closest approach to the Earth on 8 April 2002 (1.367 au), less than a month after discovery.
Solutions given here are based on data spanning over 0.827 yr in a range of heliocentric distances from 1.48 au to 4.18 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system; these perturbations lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbits).
See also Królikowska 2014.

solution description
number of observations 940
data interval 2002 03 08 – 2003 01 08
data type observed only after perihelion (POST)
data arc selection entire data set (STD)
range of heliocentric distances 1.48 au – 4.18au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 1863
RMS [arcseconds] 0.57
orbit quality class 1b
orbital elements (heliocentric ecliptic J2000)
Epoch 2002 02 15
perihelion date 2002 02 21.79812302 ± 0.00026919
perihelion distance [au] 1.46645893 ± 0.00000133
eccentricity 1.00076302 ± 0.00001166
argument of perihelion [°] 9.038272 ± 0.000227
ascending node [°] 244.583534 ± 0.000030
inclination [°] 92.545707 ± 0.000012
recip semi-major axis [10-6 au-1] -520.32 ± 7.95
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] 2.7807 ± 0.2322
A2 [10-8au/day2] 0.879 ± 0.19405
A3 [10-8au/day2] 0 (assumed)
m -2.15
n 5.093
k -4.6142
r0 [au] 2.808
α 0.1113