C/2018 C2 | CODEC

C/2018 C2 Lemmon

Comet C/2018 C2 was discovered on 5 February 2018, about four months before its perihelion passage; later a few prediscovery measurements going back to 28 January 2018 were found. This comet was last seen on 27 October 2018.

Solutions (GR and NG) given here are based on data span over 0.748 yr in the range of heliocentric distances: 2.47 au – 1.96 au (perihelion) – 2.63 au.

This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to a more tight future orbit (see future barycentric orbit).

2018c2a5 2018c2n4

solution description
number of observations	1677
data interval	2018 01 28 – 2018 10 27
data type	perihelion within the observation arc (FULL)
data arc selection	entire data set (STD)
range of heliocentric distances	2.47 au – 1.96 au (perihelion) – 2.63 au
type of model of motion	NS - non-gravitational orbits for standard g(r)
data weighting	YES
number of residuals	3273
RMS [arcseconds]	0.17
orbit quality class	1a

next 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
next reciprocal semi-major axis [10^-6 au^-1]	377.03 – 378.43 – 379.84
next perihelion distance [au]	1.93848 – 1.9385 – 1.93851
next aphelion distance [10³ au]	5.263 – 5.283 – 5.303
time interval to next perihelion [Myr]	0.1347 – 0.1355 – 0.1362
percentage of VCs with q_next < 10	100

next 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
next reciprocal semi-major axis [10^-6 au^-1]	377.03 – 378.43 – 379.84
next perihelion distance [au]	1.94492 – 1.94495 – 1.94499
next aphelion distance [10³ au]	5.263 – 5.283 – 5.303
time interval to next perihelion [Myr]	0.1347 – 0.1355 – 0.1362
percentage of VCs with q_next < 10	100