MESSENGER is in an orbit of 80° inclination, with apohermion occurring in the southern hemisphere at 7.1 R_M (R_M is the radius of Mercury) and perihermion in the northern hemisphere at 1.1 R_M, and the orbital period is 12h.
Source: wiktionary
Apohermion
Synonyms for "apohermion"
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.