C/2011 R1 McNaught
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Comet C/2011 R1 was discovered on 3 September 2011 by Robert H. McNaught (Siding Spring), that is more than a year before its perihelion passage. It was observed until 11 April 2014.
Comet had its closest approach to the Earth on 8 April 2013 (1.960 au), 5.5 months after its perihelion passage; however on 8 August 2012 (2.5 months before perihelion) the comet approached the Earth only a little further (2.035 au, see picture).
Solution given here is based on data spanning over 3.5 yr in a range of heliocentric distances: 7.47 au – 2.08 au (perihelion) – 5.91 au.
This Oort spike comet suffers tiny planetary perturbations during its passage through the planetary system that cause a bit tighter future orbit with original semimajor axis of about 10,000 au (see future barycentric orbits).
See also Królikowska 2020.
Comet had its closest approach to the Earth on 8 April 2013 (1.960 au), 5.5 months after its perihelion passage; however on 8 August 2012 (2.5 months before perihelion) the comet approached the Earth only a little further (2.035 au, see picture).
Solution given here is based on data spanning over 3.5 yr in a range of heliocentric distances: 7.47 au – 2.08 au (perihelion) – 5.91 au.
This Oort spike comet suffers tiny planetary perturbations during its passage through the planetary system that cause a bit tighter future orbit with original semimajor axis of about 10,000 au (see future barycentric orbits).
See also Królikowska 2020.
solution description | ||
---|---|---|
number of observations | 427 | |
data interval | 2010 10 11 – 2012 03 21 | |
data arc selection | data generally limited to pre-perihelion (PRE) | |
range of heliocentric distances | 7.47 au – 3.19au | |
detectability of NG effects in the comet's motion | comet with determinable NG~orbit | |
type of model of motion | GR - gravitational orbit | |
data weighting | YES | |
number of residuals | 846 | |
RMS [arcseconds] | 0.29 | |
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] | 34.65 – 38.35 – 40.40 | |
previous perihelion distance [au] | 452 – 685 – 740 | |
previous aphelion distance [103 au] | 48.8 – 51.5 – 57.2 | |
time interval to previous perihelion [Myr] | 3.94 – 4.28 – 4.6 | |
percentage of VCs with qprev > 20 | 100 |
![](media/img/2011r1/2011r1n5pares.png)
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.
Lower panel (panels): O-C diagram for this(two) solution (solutions) given in this database, where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
Lower panel (panels): O-C diagram for this(two) solution (solutions) given in this database, where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
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] | 36.22 – 38.37 – 40.44 | |
previous perihelion distance [au] | 0.57 – 0.64 – 0.75 | |
previous aphelion distance [103 au] | 49.5 – 52.1 – 55.2 | |
time interval to previous perihelion [Myr] | 3.89 – 4.2 – 4.58 | |
percentage of VCs with qprev < 10 | 100 |