39P/Oterma

39P/Oterma
Discovery
Discovered by	Liisi Oterma
Discovery date	8 April 1943
Designations
Alternative designations	1942 VII; 1950 III; 1958 IV; 39P/2001 P3
Orbital characteristics
Epoch	2023-06-25
Aphelion	8.75 AU
Perihelion	5.707 AU
Semi-major axis	7.228 AU
Eccentricity	0.2105
Orbital period	19.43 yr
Max. orbital speed	13.2 km/s
Min. orbital speed	8.6 km/s (2013-Feb-15)
Inclination	1.5470°
Last perihelion	2023-Jul-13 (JPL); 11 July 2023; 22 December 2002
Next perihelion	2042-Jul-12
Physical characteristics
Dimensions	4–5 km

39P/Oterma is a currently inactive periodic comet with an orbital period of nearly 20 years that stays outside the orbit of Jupiter. The nucleus has a diameter around 4–5 km.^[6] It was last observed in August 2021 and came to perihelion in July 2023 while 1.2 AU from Jupiter.^[2] It will finish the modest approach to Jupiter in January 2025^[7] and will next come to perihelion in July 2042 at distance of 5.9 AU from the Sun.^[1] Opposition has occurred on 11 November 2023.^[8]

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