C/2021 Q6 PanSTARRS
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Comet C/2021 Q6 was discovered on 22 August 2021 with the Pan-STARRS 1 telescope (Haleakala), that is two years and seven months before its perihelion passage.

Comet had its closest approach to the Earth on 2 September 2024 (7.76 au), about half a year after its perihelion passage.

Preferred GR solution given here is based on data span over 3.81 yr in a range of heliocentric distances: 10.99 au – 8.71 au (perihelion) – 8.80 au.

This Oort spike comet suffers tiny planetary perturbations during its passage through the planetary system that likely lead to escape this comet from the solar system on a marginally hyperbolic orbit.
solution description
number of observations 371
data interval 2021 01 02 – 2024 10 25
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 10.99 au – 8.71 au (perihelion) – 8.8 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 733
RMS [arcseconds] 0.28
orbit quality class 1a+
next orbit statistics, both Galactic and stellar perturbations were taken into account
no. of returning VCs in the swarm 0
no. of escaping VCs in the swarm 5001 *
no. of hyperbolas among escaping VCs in the swarm 0
next reciprocal semi-major axis [10-6 au-1] 3.35 – 3.99 – 4.67
next perihelion distance [au] 74.31 – 74.9 – 75.47
next aphelion distance [103 au] 430 – 500 – 600
synchronous stop epoch [Myr] 3.2 S
percentage of VCs with qnext > 20100
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.
next_g orbit statistics, here only the Galactic tide has been included
no. of returning VCs in the swarm 0
no. of escaping VCs in the swarm 5001 *
no. of hyperbolas among escaping VCs in the swarm 47
next reciprocal semi-major axis [10-6 au-1] 0.55 – 1.22 – 1.92
next perihelion distance [au] 33.2 – 33.8 – 34.5
next aphelion distance [103 au] 1000 – 1600 – 3500
synchronous stop epoch [Myr] 3.09 S
percentage of VCs with qnext > 20100