C/2011 Q2 McNaught
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Comet C/2011 Q2 was discovered on 26 August 2011 by Robert H. McNaught (Siding Spring), that is almost 5 months before its perihelion passage. It was observed until 26 April 2012.
Comet had its closest approach to the Earth on 26 January 2012 (2.271 au), a week after its perihelion passage.
Solution given here is based on data spanning over 0.665 yr in a range of heliocentric distances: 2.43 au – 1.349 au (perihelion) – 1.94 au.
This Oort spike comet suffers notable planetary perturbations during its passage through the planetary system that cause a tighter future orbit with original semimajor axis of about 1,000 au (see future barycentric orbits).
See also Królikowska 2020.
Comet had its closest approach to the Earth on 26 January 2012 (2.271 au), a week after its perihelion passage.
Solution given here is based on data spanning over 0.665 yr in a range of heliocentric distances: 2.43 au – 1.349 au (perihelion) – 1.94 au.
This Oort spike comet suffers notable planetary perturbations during its passage through the planetary system that cause a tighter future orbit with original semimajor axis of about 1,000 au (see future barycentric orbits).
See also Królikowska 2020.
| solution description | ||
|---|---|---|
| number of observations | 105 | |
| data interval | 2011 08 26 – 2012 04 26 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 2.43 au – 1.35 au (perihelion) – 1.94 au | |
| type of model of motion | NS - non-gravitational orbits for standard g(r) | |
| data weighting | YES | |
| number of residuals | 202 | |
| RMS [arcseconds] | 0.21 | |
| orbit quality class | 2a | |
| previous orbit statistics, both Galactic and stellar perturbations were taken into account | ||
|---|---|---|
| no. of returning VCs in the swarm | 4027 | * |
| no. of escaping VCs in the swarm | 974 | |
| no. of hyperbolas among escaping VCs in the swarm | 650 | |
| previous reciprocal semi-major axis [10-6 au-1] | -8.84 – 70.65 – 147.48 | |
| previous perihelion distance [au] | 1.4 – 1.6 – 610 | R |
| previous aphelion distance [103 au] | 13 – 25 – 89 | |
| time interval to previous perihelion [Myr] | 0.52 – 1.2 – 5.2 | R |
| percentage of VCs with qprev < 10 | 77 | |
| percentage of VCs with 10 < qprev < 20 | 1 | |
| percentage of VCs with qprev > 20 | 22 | |
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 | 4061 | * |
| no. of escaping VCs in the swarm | 940 | |
| no. of hyperbolas among escaping VCs in the swarm | 650 | |
| previous reciprocal semi-major axis [10-6 au-1] | -8.82 – 70.65 – 147.50 | |
| previous perihelion distance [au] | 1.37 – 1.5 – 15.1 | R |
| previous aphelion distance [103 au] | 13 – 25 – 89 | |
| time interval to previous perihelion [Myr] | 0.52 – 1.3 – 5.3 | R |
| percentage of VCs with qprev < 10 | 88 | |
| percentage of VCs with 10 < qprev < 20 | 3 | |
| percentage of VCs with qprev > 20 | 9 | |