Planetary nomenclature¶

Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed.

Version: v1 · 2026-09-28 · History
Domain-specific #: 11344
Domain group: Natural Sciences
Origin domain: Astronomy & Astrophysics
Subdomains: Planetary Cartography, Planetary Science → Astronomy & Astrophysics

Core Idea¶

Planetary nomenclature is treated here as the recurring planetary cartography identity summarized by this source-grounded definition: Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed.

Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed. Since the invention of the telescope, astronomers have given names to the surface features they have discerned, especially on the Moon and Mars. To found an authority on planetary nomenclature, the International Astronomical Union (IAU) was organized in 1919 to designate and standardize names for features on Solar System bodies.

When images are first obtained of the surface of a planet or satellite, a theme for naming features is chosen and a few important features are named, usually by members of the appropriate IAU task group (a commonly accepted planet-naming group). There are currently no named features on Uranian small satellites, however the naming convention is heroines from plays by Shakespeare and Pope. Later, as higher resolution images and maps become available, additional features are named at the request of investigators mapping or describing specific surfaces, features, or geologic formations.

For Planetary nomenclature, the abstraction is narrower than the article's general subject matter: a positive case must preserve Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed. Retaining only the name, a familiar example, or a downstream effect is insufficient. The specialist roles and tests remain anchored in planetary cartography, which is why this identity is domain-specific rather than prime.

Structural Signature¶

Sig role-phrases:

Defining carrier — Names adopted by the IAU must follow various rules and conventions established and amended through the years by the Union.
Constitutive relation — When images are first obtained of the surface of a planet or satellite, a theme for naming features is chosen and a few important features are named, usually by members of the appropriate IAU task group (a commonly accepted planet-naming group).
Operating condition — Anyone may suggest that a specific name be considered by a task group.
Recognition evidence — Names that pass review by a task group are submitted to the IAU Working Group for Planetary System Nomenclature (WGPSN).
Admissible variation — Once approved by the WGPSN, names are considered official and can be used on maps and in publications.
Characteristic consequence — 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.
Failure boundary — Boundaries (and thus coordinates) may be determined more accurately from geochemical and geophysical data obtained by future missions.

What It Is Not¶

Not the whole field of planetary cartography. The node requires the specific identity stated by Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed.
Not an over-broad reading. In general, official names will not be given to features whose longest dimensions are less than 100 meters, although exceptions may be made for smaller features having exceptional scientific interest.
Not an over-broad reading. Such names will not be given official status by the IAU, except as provided for by Rule 2 above.
Not an over-broad reading. Where appropriate, the WGPSN strongly supports an equitable selection of names from ethnic groups, countries, and gender on each map; however, a higher percentage of names from the country planning a landing is allowed on landing site maps.
Not automatically Terraforming. Retrieval proximity does not establish equivalence; the two identities must be compared by carrier, operation, and failure boundary.

Scope of Application¶

Planetary nomenclature applies literally inside planetary cartography wherever the source-defined carrier and relation can be established. Its documented habitats include:

IAU approval procedure. Once approved by the WGPSN, names are considered official and can be used on maps and in publications.
IAU rules and conventions. Where possible, the themes established in early solar system nomenclature should be used and expanded on.
IAU rules and conventions. No names having political, military or (modern) religious significance may be used, except for names of political figures prior to the 19^th century.
IAU rules and conventions. 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.
IAU rules and conventions. Diacritical marks are a necessary part of a name and will be used.
Naming conventions. One feature classification, regio, was originally used on early maps of the Moon and Mercury (drawn from telescopic observations) to describe vague albedo features.

Outside planetary cartography, the name should be retained only when these same operational conditions survive; otherwise the comparison belongs to the broader parent Pattern or should be marked as analogy.

Clarity¶

A clear use of Planetary nomenclature names the carrier, the operative relation, and the conditions under which the source treats the identity as present. The minimal definition is Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed. The strongest recognition evidence in the frozen account is: Names that pass review by a task group are submitted to the IAU Working Group for Planetary System Nomenclature (WGPSN). A report should distinguish that evidence from a proxy, consequence, or common implementation. It should also state the qualification In general, official names will not be given to features whose longest dimensions are less than 100 meters, although exceptions may be made for smaller features having exceptional scientific interest. so that a reader can reproduce the classification rather than infer it from topical resemblance.

Manages Complexity¶

Planetary nomenclature compresses multiple planetary cartography details into a stable diagnostic relation. The source shows both the central mechanism—when images are first obtained of the surface of a planet or satellite, a theme for naming features is chosen and a few important features are named, usually by members of the appropriate IAU task group (a commonly accepted planet-naming group).—and the practical consequence—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. This compression makes cases comparable while leaving parameters, conventions, exceptions, and evidential quality explicit. It is lossy by design: local history and implementation details may be omitted only when they do not alter the defining relation.

Abstract Reasoning¶

Type the carrier. Identify the planetary cartography entities to which the claim applies.
State the relation. Use the source-grounded identity: Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed.
Check operation and conditions. Anyone may suggest that a specific name be considered by a task group.
Demand recognition evidence. Names that pass review by a task group are submitted to the IAU Working Group for Planetary System Nomenclature (WGPSN).
Test variation. Change an implementation or setting while preserving once approved by the WGPSN, names are considered official and can be used on maps and in publications.
Run the collapse test. Remove the defining operation; if the label still seems equally apt, only a topic or correlate was retained.
Reduce cautiously. When the specialist conditions cannot be carried, route the residual comparison to Pattern.

Knowledge Transfer¶

Within the home domain. Knowledge about Planetary nomenclature transfers literally when a new case preserves the same carrier type, relation, and recognition test. Once approved by the WGPSN, names are considered official and can be used on maps and in publications. Where possible, the themes established in early solar system nomenclature should be used and expanded on.

Beyond the home domain. No canonical parent is asserted for Planetary nomenclature. An outside case receives the specialist name only when the same typed roles and rejection conditions can be filled literally; otherwise the comparison remains an analogy pending later graph densification.

Examples¶

Canonical¶

Accessible and authoritative sources, including Internet sources, are required for adopted names. This case is canonical because it supplies a concrete carrier and lets the defining relation be checked rather than merely named.

Mapped back: carrier → the entities in the documented case; operation → Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed; recognition evidence → Names that pass review by a task group are submitted to the IAU Working Group for Planetary System Nomenclature (WGPSN)

Applied / In Practice¶

The boundaries of many large features (such as terrae, regiones, planitiae and plana) are not topographically or geomorphically distinct; the coordinates of these features are identified from an arbitrarily chosen center point. The applied case shows how the identity is used under a second setting or qualification while keeping the same operative relation.

Mapped back: changed setting → Naming conventions; invariant → Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed; boundary → the case exits the class when in general, official names will not be given to features whose longest dimensions are less than 100 meters, although exceptions may be made for smaller features having exceptional scientific interest

Structural Tensions¶

T1 — Stable identity versus admissible variation. In general, official names will not be given to features whose longest dimensions are less than 100 meters, although exceptions may be made for smaller features having exceptional scientific interest. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Which changes preserve the defining relation, and which replace it?

T2 — Recognition versus proxy. Such names will not be given official status by the IAU, except as provided for by Rule 2 above. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Does the cited evidence establish the identity or only a correlated sign?

T3 — Definition versus implementation. Where appropriate, the WGPSN strongly supports an equitable selection of names from ethnic groups, countries, and gender on each map; however, a higher percentage of names from the country planning a landing is allowed on landing site maps. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Is the observed implementation constitutive, optional, or merely common?

T4 — Scope versus overextension. No names having political, military or (modern) religious significance may be used, except for names of political figures prior to the 19^th century. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Can every claimed application fill the same typed roles without metaphor?

T5 — Transfer versus domain accent. Names adopted by the IAU must follow various rules and conventions established and amended through the years by the Union. The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: Does the receiving case instantiate Planetary nomenclature literally, co-instantiate Pattern, or only resemble it?

T6 — Autonomy versus reduction. When images are first obtained of the surface of a planet or satellite, a theme for naming features is chosen and a few important features are named, usually by members of the appropriate IAU task group (a commonly accepted planet-naming group). The tension matters because emphasizing only one side either dissolves the identity or overstates what the evidence and domain conventions warrant.

Diagnostic: What does Planetary nomenclature distinguish that the broader parent Pattern leaves together?

Structural–Framed Character¶

Planetary nomenclature is mixed or framed-leaning. Its structural side is the repeatable organization summarized by Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed. Its framed side is the planetary cartography vocabulary that fixes the carrier, evidence, exceptions, and admissible transformations.

Evaluative weight: the identity can be stated descriptively even when applications carry practical stakes. Human-practice dependence: the source-grounded carrier determines whether the relation exists independently or is constituted by a practice. Institutional origin: disciplinary conventions stabilize the name and test. Vocabulary portability: Anyone may suggest that a specific name be considered by a task group. Import versus recognition: literal transfer requires the same mechanism; shape alone is analogy.

Its portable skeleton is Pattern. Its character: a recurring specialist identity whose thin organization can be abstracted, while its operational meaning remains domain-bound.

Structural Core vs. Domain Accent¶

What is skeletal. Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed. The stable skeleton is the typed relation expressed in that definition and the entry's recognition and collapse tests. The source identifies these operative conditions: Names adopted by the IAU must follow various rules and conventions established and amended through the years by the Union. When images are first obtained of the surface of a planet or satellite, a theme for naming features is chosen and a few important features are named, usually by members of the appropriate IAU task group (a commonly accepted planet-naming group). It further constrains recognition and variation through: Anyone may suggest that a specific name be considered by a task group. Names that pass review by a task group are submitted to the IAU Working Group for Planetary System Nomenclature (WGPSN).

What is domain-bound. planetary cartography supplies the operative entities, technical vocabulary, warrants, and exceptions that make Planetary nomenclature literal. Its documented scope includes the condition that Once approved by the WGPSN, names are considered official and can be used on maps and in publications. Another bounded application condition is that Where possible, the themes established in early solar system nomenclature should be used and expanded on. These are not decorative examples; they determine which carrier and evidence can fill the abstraction's roles.

Why no parent is asserted. Removing those specialist details does not currently yield one live catalog node that is a necessary genus for every instance. The entry is therefore approved as unparented rather than attached by topical resemblance. Its collapse evidence remains specific—Once approved by the WGPSN, names are considered official and can be used on maps and in publications.—and future graph densification may discover a defensible relation only if it preserves that boundary.

This entry is a kind of Naming System.

Approved unparented node. No current live node supplies a defensible necessary genus or structural prerequisite for Planetary nomenclature. The reviewed identity is: Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed. The accelerated suggestion was declined because topical or lexical similarity does not establish hierarchy; the node is admitted without a parent pending later graph densification.
Related reasoning operations. Evidence, representation, comparison, classification, transformation, or evaluation may participate in particular cases, but participation does not make any one of them a necessary parent of every instance.

Relationships to Other Abstractions¶

Current abstraction Planetary nomenclature Domain-specific

Parents (1) — more general patterns this builds on

Planetary nomenclature is a kind of Naming System Domain-specific

Planetary nomenclature satisfies the defining boundary of Naming System: A naming system is a governed scheme of namespaces, formation rules, assignment authority, uniqueness or interpretability constraints, and lifecycle procedures for creating, resolving, changing, and retiring names or identifiers within a declared domain.

Hierarchy path (1) — routes to 1 parentless root

Planetary nomenclature → Naming System → System → Composition → Gestalt Principles → Holism

Neighborhood in Abstraction Space¶

Planetary nomenclature sits in a sparse region of the domain-specific corpus (83^rd percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.

Family — Geological & Geographic Interpretation (8 abstractions)

Nearest neighbors

Computed from structural-signature embeddings · 2026-10-08

Not to Be Confused With¶

Pattern. The parent omits the specialist differentia. Tell: Can the case establish Planetary nomenclature, like terrestrial nomenclature, is a system of uniquely identifying features on the surface of a planet or natural satellite so that the features can be easily located, described, and discussed?
Terraforming. The hypothetical deliberate alteration of a planet, moon, or other body’s atmosphere, temperature, surface, and ecology to sustain Earth-like life or human habitation. Tell: Which entry's carrier, operation, and failure condition are satisfied?
Datum reference. A declared geometrically significant point, axis, plane or feature used as the origin or constraint for defining and measuring other features of an object. Tell: Which entry's carrier, operation, and failure condition are satisfied?
Phylogenetic nomenclature. Phylogenetic nomenclature names taxa by explicit reference to common ancestry and clade definitions rather than fixing names primarily through ranked taxonomic categories. Tell: Which entry's carrier, operation, and failure condition are satisfied?
A measurement, proxy, or consequence. Those may provide evidence without being the identity. Tell: Would Planetary nomenclature remain present if the detector or downstream effect changed?
A metaphorical analogue. A similar shape outside planetary cartography lacks the specialist mechanism. Tell: Do the native roles transfer literally, or only the parent Pattern?

References¶

Frozen Wikipedia discovery revision: https://en.wikipedia.org/wiki/Planetary_nomenclature (revision 1367227388).
Preserved source candidate: https://planetarynames.wr.usgs.gov/Page/Introduction
Preserved source candidate: https://planetarynames.wr.usgs.gov/history.html
Preserved source candidate: https://planetarynames.wr.usgs.gov/Page/Approved
Preserved source candidate: https://planetarynames.wr.usgs.gov/Page/Rules
Preserved source candidate: https://planetarynames.wr.usgs.gov/DescriptorTerms
Preserved source candidate: https://planetarynames.wr.usgs.gov/SearchResults?target=MERCURY&featureType=Catena,%20catenae
Preserved source candidate: https://planetarynames.wr.usgs.gov/SearchResults?target=MERCURY&featureType=Crater,%20craters
Preserved source candidate: https://planetarynames.wr.usgs.gov/SearchResults?target=MERCURY&featureType=Dorsum,%20dorsa

The frozen Wikipedia revision is discovery provenance. The retained source set was reviewed for identity, formal or operational relation, and scope. The encyclopedia's structural synthesis is bounded to those claims; a thin authority surface is recorded as a nonblocking source-strengthening repair rather than concealed.