C/2013 G2 McNaught
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Comet C/2013 G2 was discovered on 8 April 2013 by Robert H. McNaught (Siding Spring), that is about 4 months after its perihelion passage. Next, it was followed more about 4.5 months until August 25. Comet had its closest approach to the Earth on 8 June 2013 (2.05 au, 2 months after discovery).
GR solution given here is based on data spanning over 0.38 yr in the post perihelion leg of orbit in the range of heliocentric distances from 2.58 au to 3.61 au. Due to short data arc the NG orbit is not possible to obtain.
This is comet outside the Oort spike with semimajor axis of about 4050 au. Comet suffers small planetary perturbations while passing through the planetary system and these perturbations lead to slightly less tight orbit with semimajor axis of about 5350 au (see future barycentric orbits).
GR solution given here is based on data spanning over 0.38 yr in the post perihelion leg of orbit in the range of heliocentric distances from 2.58 au to 3.61 au. Due to short data arc the NG orbit is not possible to obtain.
This is comet outside the Oort spike with semimajor axis of about 4050 au. Comet suffers small planetary perturbations while passing through the planetary system and these perturbations lead to slightly less tight orbit with semimajor axis of about 5350 au (see future barycentric orbits).
| solution description | ||
|---|---|---|
| number of observations | 111 | |
| data interval | 2013 04 08 – 2013 08 25 | |
| data type | observed only after perihelion (POST) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 2.58 au – 3.61au | |
| 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 | 213 | |
| RMS [arcseconds] | 0.31 | |
| orbit quality class | 2a | |
| 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] | 236.16 – 246.98 – 257.55 | |
| previous perihelion distance [au] | 2.1457 – 2.1464 – 2.147 | |
| previous aphelion distance [103 au] | 7.76 – 8.1 – 8.47 | |
| time interval to previous perihelion [Myr] | 0.242 – 0.257 – 0.275 | |
| percentage of VCs with qprev < 10 | 100 | |
Upper panel: 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.
Middle panel(s): O-C diagram for a given solution (sometimes in comparison to another solution available in CODE), where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
Lowest panel: Relative weights for a given data set(s).
Middle panel(s): O-C diagram for a given solution (sometimes in comparison to another solution available in CODE), where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
Lowest panel: Relative weights for a given data set(s).
| previous_g 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] | 236.16 – 246.98 – 257.55 | |
| previous perihelion distance [au] | 2.1463 – 2.147 – 2.1475 | |
| previous aphelion distance [103 au] | 7.76 – 8.1 – 8.47 | |
| time interval to previous perihelion [Myr] | 0.242 – 0.257 – 0.275 | |
| percentage of VCs with qprev < 10 | 100 | |