Mercury

Catenae Radio telescope facilities
Craters Artists, musicians, painters, and authors who have made outstanding or fundamental contributions to their field and have been recognized as art historically significant figures for more than 50 years
Dorsa Scientists who have contributed to the study of Mercury
Faculae Word for "snake" in various languages
Fossae Significant works of architecture
Montes Word for "hot" in various languages
Planitiae, plana Names for Mercury (either the planet or the god) in various languages
Rupēs Ships of discovery or scientific expeditions
Valles Abandoned cities (or towns or settlements) of antiquity

Venus

Astra Goddesses, miscellaneous
Chasmata Goddesses of hunt; moon goddesses
Colles Sea goddesses
Coronae Fertility and earth goddesses
Craters Women who have made outstanding or fundamental contributions to their field (over 20 km); Common female first names (under 20 km)
Dorsa Sky goddesses
Farra Water goddesses
Fluctūs Goddesses, miscellaneous
Fossae Goddesses of war
Labyrinthi Goddesses, miscellaneous
Lineae Goddesses of war
Montes Goddesses, miscellaneous (also one physicist)
Paterae Famous women
Planitiae Mythological heroines
Plana Goddesses of prosperity
Regiones Giantesses and Titanesses (also two Greek alphanumeric)
Rupēs Goddesses of hearth and home
Tesserae Goddesses of fate and fortune
Terrae Goddesses of love
Tholi Goddesses, miscellaneous
Undae Desert goddesses
Valles Word for planet Venus in various world languages (400 km and longer); River goddesses (less than 400 km in length)

The Moon

Note: During the 360-year history of lunar nomenclature, various names were given that do not conform to the present naming scheme, including the special action of 1970 to commemorate six astronauts and six cosmonauts while they were still living. The themes below will be followed for future naming with adherence to the current IAU Rules and Conventions (https://planetarynames.wr.usgs.gov/Page/Rules).

Craters Scientists, engineers, and explorers, as well as other persons connected with astronomy, planetary, or space research who have made outstanding or fundamental contributions to their field. Russian cosmonauts are commemorated by craters in and around Mare Moscoviense. American astronauts are commemorated by craters in and around the crater Apollo. Appropriate locations will be provided in the future for other space-faring nations. First names are used for small craters of special interest.
Lacūs, maria, paludes, sinūs, and oceani Latin terms describing weather and other abstract concepts
Montes Terrestrial mountain ranges, nearby craters, and scientists who have made outstanding or fundamental contributions to their fields
Rupēs, valles Nearby craters or other landforms
Dorsa Geoscientists
Catenae and rimae Nearby craters
Satellite Features Craters lettered after nearby prominent named craters

Mars and Martian Satellites

Mars

Albedo Features Names from classical mythology assigned by Schiaparelli and Antoniadi
Large craters (approximately 50 km and larger) Scientists, especially those who have contributed significantly to the study of Mars; writers and others who have contributed to the lore of Mars
Small craters (approximately 50 km and smaller) Small towns and villages of the world with populations of approximately 100,000 or less. This category is simply a large source of crater names. No commemoration of specific towns or villages is intended.
Smaller features within a larger named feature The normal naming convention shall be suspended and instead their names shall be chosen so that they bear a mnemonic relationship to the given name of the larger feature, followed by the appropriate descriptor term (crater, cavus, patera, etc.).
Large valles Name for Mars/star in various languages
Small valles Classical or modern names of rivers
Other features From a nearby named albedo feature on Schiaparelli or Antoniadi maps. If no nearby albedo feature name is available, then from a nearby named crater.

Deimos

Authors who wrote about martian satellites

Phobos

Scientists involved with the discovery, dynamics, or properties of the martian satellites, and people and places from Jonathan Swift's "Gulliver's Travels"

Satellites of Jupiter

Amalthea

People and places associated with the Amalthea myth

Thebe

People and places associated with the Thebe myth

Io

Active eruptive centers Fire, sun, thunder, and volcano gods and heroes
Catenae Sun gods
Fluctūs Name derived from nearby named feature, or fire, sun, thunder, volcano gods, goddesses and heroes, or mythical blacksmiths
Mensae People associated with Io myth, people from Dante's Inferno, or derived from a nearby named feature
Montes Places associated with Io myth, places from Dante's Inferno, or derived from a nearby named feature
Paterae Fire, sun, thunder, volcano gods, heroes, goddesses, mythical blacksmiths, including names from the associated eruptive center
Plana Places associated with Io myth, places from Dante's Inferno, or derived from a nearby named feature
Regiones Places associated with Io myth, places from Dante's Inferno, or derived from a nearby named feature
Tholi People associated with Io myth, people from Dante's Inferno, or derived from a nearby named feature
Valles Named derived from nearby named feature

Europa

Chaos and cavi Places associated with Celtic myths
Craters and mensae Celtic gods and heroes
Flexūs Places associated with the Europa myth, or Celtic stone rows
Large ringed features Celtic stone circles
Lineae and fossae People associated with the Europa myth, or Celtic stone rows
Maculae Places associated with the Europa myth
Regiones Places associated with Celtic myths

Ganymede

Catenae Gods and heroes of ancient Fertile Crescent people
Craters Gods and heroes of ancient Fertile Crescent people
Faculae Places associated with Egyptian myths
Fossae Gods (or principals) of ancient Fertile Crescent people
Paterae Dry wadis (channels) of the Fertile Crescent region
Regiones Astronomers who discovered Jovian satellites
Sulci Places associated with myths of ancient people

Callisto

Names are drawn from myths and folktales of cultures of the Far North such as Norse, Chukchi, Inuit, Sami, etc.

Catenae Rivers, valleys, and ravines from myths and folktales of cultures of the Far North
Craters Characters from myths and folktales of cultures of the Far North
Faculae Gods and characters of frost, snow, cold, and sleet from myths and folktales of cultures of the Far North
Large ringed features Places (other than rivers, valleys and ravines) from myths and folktales of cultures of the Far North

Satellites of Saturn

Janus

People from myth of Castor and Pollux (twins)

Epimetheus

People from myth of Castor and Pollux (twins)

Mimas

Craters People from Malory's Le Morte d'Arthur legends (Baines translation), also one crater named for the discoverer of Mimas
Chasmata Places from Malory's Le Morte d'Arthur legends (Baines translation), and places from Greek myths about giants (Mimas was named for a giant)

Enceladus

People and places from Burton's Arabian Nights

Tethys

People and places from Homer's Odyssey

Dione

People and places from Virgil's Aeneid

Rhea

People and places from creation myths (with Asian emphasis)

Titan

Albedo features, terrae Sacred or enchanted places, paradise, or celestial realms from legends, myths, stories, and poems of cultures from around the world
Colles Names of characters from Middle-earth, the fictional setting in fantasy novels by English author J.R.R. Tolkien (1892-1973)
Craters and ringed features Gods and goddesses of wisdom
Facula and faculae Facula: Names of islands on Earth that are not politically independent
Faculae: Names of archipelagos
Fluctūs Gods and goddesses of beauty
Flumina Names of mythical or imaginary rivers
Freta Names of characters from the Foundation series of science fiction novels by American author Isaac Asimov (1920-1992)
Insulae Names of islands from legends and myths
Lacūs and lacunae Lakes on Earth, preferably with a shape similar to the lacus or lacuna on Titan
Maria Sea creatures from myth and literature
Montes Names of mountains and peaks from Middle-earth, the fictional setting in fantasy novels by English author J.R.R. Tolkien (1892-1973)
Other features (maculae, regiones, paterae, and arcūs) Deities of happiness, peace, and harmony from world cultures
Planitiae and labyrinthi Names of planets from the Dune series of science fiction novels by American author Frank Herbert (1920 - 1986)
Sinūs Names of terrestrial bays, coves, fjords or other inlets
Undae Gods and goddesses of wind
Virgae Gods and goddesses of rain

Hyperion

Sun and Moon deities

Iapetus

People and places from Sayers' translation of Chanson de Roland (For craters, French names are generally used in the bright areas, and Saracen names are generally used in the dark areas)

Phoebe

Craters People associated with Phoebe, people from the Argonautica by Apollonius Rhodius and Valerius Flaccus
Other features Places from the Argonautica

Satellites of Uranus

Puck

Mischievous (Pucklike) spirits (class)

Miranda

Characters, places from Shakespeare's plays

Ariel

Light spirits (individual and class)

Umbriel

Dark spirits (individual)

Titania

Female Shakespearean characters, places

Oberon

Shakespearean tragic heroes and places

Small Satellites

Heroines from Shakespeare and Pope

Satellites of Neptune

Proteus

Water-related spirits, gods, goddesses (excluding Greek and Roman names)

Triton

Aquatic names, excluding Roman and Greek. Possible categories include worldwide aquatic spirits, terrestrial fountains or fountain locations, terrestrial aquatic features, terrestrial geysers or geyser locations, terrestrial islands.

Nereid

Individual nereids

Small Satellites

Gods and goddesses associated with Neptune/Poseidon mythology or generic mythological aquatic beings

Pluto and Plutonian Satellites

Pluto

Faculae, labyrinthi, maculae, and sulci Gods, goddesses, and other beings associated with the Underworld from mythology, folklore and literature
Cavi, dorsa, lacūs, and paterae Names for the Underworld and for Underworld locales from mythology, folklore and literature
Fluctūs, fossae, and valles Heroes and other explorers of the Underworld
Craters and regiones Scientists and engineers associated with Pluto and the Kuiper Belt
Colles, lineae, planitiae, and terrae Pioneering space missions and spacecraft
Montes, paludes, rupēs Historic pioneers who crossed new horizons in the exploration of the Earth, sea and sky

Charon

Maculae, plana, planitiae, and terrae Destinations and milestones of fictional space and other exploration
Chasmata Fictional and mythological vessels of space and other exploration
Craters Fictional and mythological voyagers, travelers and explorers
Montes and dorsa Authors and artists associated with space exploration, especially Pluto and the Kuiper Belt

Styx

River gods

Nix

Deities of the night

Kerberos

Dogs from literature, mythology and history

Hydra

Legendary serpents and dragons

Asteroids

(1) Ceres

Craters Gods and goddesses of agriculture and vegetation from world mythology
Other features Names of agricultural festivals of the world

(4) Vesta

Craters Names historically associated with the Roman goddess Vesta (vestal virgins, people associated with vestal virgins) and famous Roman women. Approved names are not meant to commemorate individuals, but merely as names for surface features.
Regiones Discoverer of Vesta, and scientists who have contributed to the exploration and study of Vesta
Other features Places and festivals associated with vestal virgins

(21) Lutetia

Craters Cities of the Roman Empire and adjacent parts of Europe at the time of Lutetia (52 BC - 360 AD)
Regiones Discoverer of Lutetia, and provinces of the Roman Empire at the time of Lutetia
Other features Rivers of the Roman Empire and adjacent parts of Europe at the time of Lutetia

(243) Ida

Craters Caverns and grottos of the world
Dorsa Galileo project participants
Regiones Discoverer of Ida and places associated with the discoverer

(243) Ida I Dactyl

Craters Idaean dactyls

(253) Mathilde

Craters Coal fields and basins of the world

(433) Eros

Craters Mythological and legendary names of an erotic nature
Regiones Discoverers of Eros
Dorsa Scientists who have contributed to the exploration and study of Eros

(951) Gaspra

Craters Spas of the world
Regiones Discoverer of Gaspra, and Galileo project participants

(2867) Steins

Craters Names of gemstones
Regio Discoverer of Steins
Other features Places associated with gemstones

(25143) Itokawa

All feature types Places and features associated with astronautics and planetary sciences

(65803) Didymos and Dimorphos

All feature types Percussion musical instruments

(101955) Bennu

All feature types Birds and bird-like creatures in mythology, and the places associated with them

(162173) Ryugu

All feature types Names in stories and fairy tales for children

(486958) Arrokoth

All feature types Words for "sky" in the languages of the world, past and present