C/2015 O1 PANSTARRS
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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.

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