C/2015 O1 | CODEC

C/2015 O1 PANSTARRS

Comet C/2015 O1 was discovered on 19 July 2015 with Pan-STARRS 1 telescope (Haleakala), that is about 2.5 years before its perihelion passage. Some prediscovery images of this comet were found: taken on 15 and 17 of June 2015 by Space Surveillance Telescope (Atom Site). In 2020, this comet is still observed.
Comet had its closest approach to the Earth on 5 April 2018 (3.233 au), about 1.5 month after its perihelion passage.
Solutions given here are based on data spanning over 2.94 yr in a range of heliocentric distances: 8.65 au – 3.730 au (perihelion) – 3.83 au (25 May 2018).
This is Oort spike comet.

2015o1a1 2015o1c1

solution description
number of observations	2735
data interval	2015 06 15 – 2018 05 25
data type	perihelion within the observation arc (FULL)
data arc selection	entire data set (STD)
range of heliocentric distances	8.65 au – 3.73 au (perihelion) – 3.83 au
type of model of motion	NC - non-gravitational orbits for symmetric CO-g(r)-like function
data weighting	YES
number of residuals	5426
RMS [arcseconds]	0.51
orbit quality class	1a+

orbital elements (heliocentric ecliptic J2000)
Epoch	2018 03 23
perihelion date	2018 02 19.02897501	± 0.00049629
perihelion distance [au]	3.72964132	± 0.00000135
eccentricity	0.99995771	± 0.00000296
argument of perihelion [°]	89.594760	± 0.000102
ascending node [°]	299.857336	± 0.000018
inclination [°]	127.211003	± 0.000005
recip semi-major axis [10^-6 au^-1]	11.34	± 0.79

non-gravitational parameters
A₁ [10^-8au\day^-2]	4.5209	± 0.0565
A₂ [10^-8au\day^-2]	-0.60183	± 0.0964
A₃ [10^-8au\day^-2]	0.10377	± 0.01901
m	-2.00
n	3.000
k	-2.6000
r₀ [au]	10.000
α	0.0100