IAU Rules and Conventions
Names adopted by the IAU must follow various rules and conventions established and amended through the years by the Union. These include:
- Nomenclature is a tool and the first consideration should be to make it simple, clear, and unambiguous.
- Features whose longest dimension is less than 100 meters are not assigned official names unless they have exceptional scientific interest.
- The number of names chosen for each body should be kept to a minimum, and their placement governed by the requirements of the scientific community.
- Duplication of the same name on two or more bodies is to be avoided.
- Individual names chosen for each body should be expressed in the language of origin. Transliteration for various alphabets should be given, but there will be no translation from one language to another.
- Where possible, the themes established in early solar system nomenclature should be used and expanded on.
- Solar system nomenclature should be international in its choice of names. Recommendations submitted to the IAU national committees will be considered, but final selection of the names is the responsibility of the International Astronomical Union. The WGPSN strongly supports equitable selection of names from ethnic groups/countries on each map; however, a higher percentage of names from the country planning a landing is allowed on landing site maps.
- No names having political, military or religious significance may be used, except for names of political figures prior to the 19th century. (Note: Apparently this only goes for religions that are widely practiced today, since gods and goddesses of ancient religions are obviously acceptable to the IAU.)
- Commemoration of persons on planetary bodies should not be a goal in itself but should be reserved for persons of high and enduring international standing. Persons being so honored must have been deceased for at least three years.
- When more than one spelling of a name is extant, the spelling preferred by the person, or used in an authoritative reference, should be used. Diacritical marks are a necessary part of a name and will be used.
- Ring and ring-gap nomenclature and names for newly discovered satellites are developed in joint deliberation between WGPSN and IAU Commission 20. Names will not be assigned to satellites until their orbital elements are reasonably well known or definite features have been identified on them.
In addition to these general rules, each task group develops additional conventions as it formulates an interesting and meaningful nomenclature for individual planetary bodies.
Read more about this topic: Planetary Nomenclature
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