C/2008 E3 Garradd
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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.
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 | |
| previous orbit statistics, both Galactic and stellar perturbations were taken into account | ||
|---|---|---|
| no. of returning VCs in the swarm | 5001 | * |
| no. of escaping VCs in the swarm | 0 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 139.82 – 143.57 – 147.33 | |
| previous perihelion distance [au] | 5.551 – 5.554 – 5.5576 | |
| previous aphelion distance [103 au] | 13.6 – 13.9 – 14.3 | |
| time interval to previous perihelion [Myr] | 0.559 – 0.581 – 0.604 | |
| percentage of VCs with qprev < 10 | 100 | |
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.
| previous orbit statistics, here only the Galactic tide has been included | ||
|---|---|---|
| no. of returning VCs in the swarm | 5001 | * |
| no. of escaping VCs in the swarm | 0 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 139.82 – 143.57 – 147.34 | |
| previous perihelion distance [au] | 5.5531 – 5.5558 – 5.5587 | |
| previous aphelion distance [103 au] | 13.6 – 13.9 – 14.3 | |
| time interval to previous perihelion [Myr] | 0.559 – 0.581 – 0.604 | |
| percentage of VCs with qprev < 10 | 100 | |