C/2018 Y1 (Iwamoto)

For the 2013 and 2020 comets of the same name, see C/2013 E2 (Iwamoto) and C/2020 A2 (Iwamoto).
C/2018 Y1 (Iwamoto)
Comet Iwamoto photographed by Brandon Ghany on 26 February 2019
Discovery
Discovered byMasayuki Iwamoto
Discovery siteAwa, Tokushima, Japan
Discovery date18 December 2018
Designations
CK18Y010
Orbital characteristics
Epoch3 March 2019 (JD 2458545.5)
Observation arc348 days
Number of
observations		2,771
Aphelion287.25 AU
Perihelion1.287 AU
Semi-major axis144.27 AU
Eccentricity0.9911
Orbital period1,733 years
Inclination160.40°
147.48°
Argument of
periapsis		358.06°
Last perihelion7 February 2019
TJupiter–1.286
Earth MOID0.299 AU
Jupiter MOID1.507 AU
Physical characteristics
Comet total
magnitude (M1)		13.6
5.5
(2019 apparition)

C/2018 Y1 (Iwamoto) is a non-periodic comet with a retrograde orbit discovered on 18 December 2018, by Japanese amateur astronomer Masayuki Iwamoto. Its orbital period is estimated to be 1,733 years, and it passed closest to Earth on 13 February 2019.

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