C/2008 E3 Garradd
more info
C/2008 E3 was discovered on 5 March 2008 by Gordon J. Garradd (Siding Spring), that is about 5 months before its perihelion passage. In was observed until mid-April 2010.
This comet made its closest approach to the Earth on 24 June 2008 (4.715 au), about 3.5 months after its discovery.
Solutions given here are based on data spanning over 2.10 yr in a range of heliocentric distances: 5.64 au – 5.531 au (perihelion) – 7.07 au.
This comet (original semimajor axis of about 7,000 au) suffers moderate planetary perturbations during its passage through the planetary system; these perturbations lead to a more tight future orbit with semimajor axis of about 1,350 au.
solution description
number of observations 110
data interval 2008 03 05 – 2010 04 12
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 5.64 au – 5.53 au (perihelion) – 7.07 au
detectability of NG effects in the comet's motion NG effects not determinable
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 217
RMS [arcseconds] 0.50
orbit quality class 1a
orbital elements (heliocentric ecliptic J2000)
Epoch 2008 08 02
perihelion date 2008 08 02.20884372 ± 0.00227753
perihelion distance [au] 5.53102503 ± 0.00001045
eccentricity 0.99853829 ± 0.00001610
argument of perihelion [°] 218.092908 ± 0.000228
ascending node [°] 105.674986 ± 0.000028
inclination [°] 105.076575 ± 0.000037
recip semi-major axis [10-6 au-1] 264.27 ± 2.91
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