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English
Noun
apohermion (plural not attested)
- (astronomy) Apoapsis around Mercury.
2013 June, Guan Le, Peter J Chi, Xochitl Blanco-Cano, Scott Boardsen, James A Slavin, Brian J Anderson, Haje Korth, “Upstream ultra‐low frequency waves in Mercury's foreshock region: MESSENGER magnetic field observations”, in Journal of Geophysical Resarch, volume 118, number 6:MESSENGER is in an orbit of 80° inclination, with apohermion occurring in the southern hemisphere at 7.1 RM (RM is the radius of Mercury) and perihermion in the northern hemisphere at 1.1 RM, and the orbital period is 12h.