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Beyer and Mark Showalter compiles official IAU-approved and informal New Horizons team names used on Pluto and Charon. It explains that some features remain unofficial placeholders and may change with future IAU decisions, and notes that no feature names exist yet for Pluto’s four small satellites. The appendix also documents Pluto’s naming conventions and related mythology-derived categories, and lists additional colloquial nicknames for completeness.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/pluto-and-charon-nomenclature-appendix-a/154210/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/pluto-and-charon-nomenclature-appendix-a/154210.png","ImageObject",300,407,{"name":92,"@type":93},"Oliver","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-18","2026-08-28",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",13,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What is the purpose of this appendix on Pluto and Charon nomenclature?","Question",{"text":113,"@type":114},"It provides a listing of Pluto and Charon names that are IAU-approved at the time of publication, alongside informal names used in the book and by the New Horizons Team.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"Why might some names change in the future?",{"text":118,"@type":114},"Several informal names are treated as placeholders, and they may change depending on work by the New Horizons team and future IAU nomenclature decisions.",{"name":120,"@type":111,"acceptedAnswer":121},"Are there any feature names for Pluto’s four small satellites?",{"text":122,"@type":114},"The appendix states that there are currently no feature names on Pluto’s four small satellites.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},154210,1787889578,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":46,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":130,"read_time":31,"preview_page_count":4},8796095461610,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","Pluto and Charon Nomenclature  \nRoss A. Beyer  \nSETI Institute and NASA Ames Research Center  \nMark Showalter  \nSETI Institute  \nOctober 8, 2021  \nThis material was published as Appendix A in The Pluto System After New Horizons book, and copyrights on that anthology work are owned by the Arizona Board of Regents, but copyright to the material in this document is retained by the authors (©2021) and shared with you via a Creative Commons license. More information can be found in the appendix at the end of this work.  \nCitation: Beyer R. A. and Showalter M. (2021) Appendix A: Pluto and Charon Nomenclature. In The Pluto System After New Horizons (S. A. Stern, J. M. Moore, W. M. Grundy, L. A. Young, and R. P. Binzel, eds.), pp. 627–639. Univ. of Arizona, Tucson, DOI: 10.2458/azu uapress 9780816540945-ch027 .  \nSome names in use on Pluto and Charon are now formalized and others are still informal. This appendix is meant to provide a listing of those names that are IAU-approved at this time 1 , and also the informal names used in this book and by the New Horizons Team. These informal names are essentially placeholders and they may change after publication of this volume depending on work by the New Horizons team and future IAU nomenclature decisions. There are currently no feature names on the four small satellites of Pluto.  \n1 Pluto Nomenclature  \nPluto is named after the Roman god of the Underworld, suggested by Venetia Burney in 1930 . The International Astronomical Union (IAU) has assigned of􀀂cial names (Table 1), and the most updated list can be found at https:// [planetarynames.wr.usgs.gov/Page/PLUTO/target](planetarynames.wr.usgs.gov/Page/PLUTO/target. The names)[. The names](planetarynames.wr.usgs.gov/Page/PLUTO/target. The names)[ ](planetarynames.wr.usgs.gov/Page/PLUTO/target. The names)are derived from deities and other beings associated with the underworld from mythology, folklore, and literature (faculae, maculae, and sulci); names for the underworld and underworld locales from mythology, folklore, and literature (cavi, dorsa, lac¯us, and paterae); heroes and other explorers of the underworld (􀀃uct¯us, fossae, and valles); scientists and engineers associated with  \n1The original Appendix A 􀀂nal draft was submitted May 2021 .  \nPluto and the Kuiper Belt (craters and regiones); pioneering space missions and spacecraft (colles, lineae, planitiae, and terrae); and historic pioneers who crossed new horizons in the exploration of the Earth, sea, and sky (montes, paludes, and rup¯es) .  \nThe informal names used in this book are also in Table 1 . The formal and informal names are illustrated in Figures 2 through 7 .  \nThere are some additional “colloquial” nicknames that we include here for completeness. The “heart” on Pluto is Tombaugh Regio due to its resemblance to a heart-shape. Very soon after the 􀀃yby (and only very brie􀀃y) the large, dark feature that we informally refer to as Cthulhu was nicknamed “the whale” as its outline resembles a whale in pro􀀂le. The term “brass knuckles” was used in 2015-2016 to refer to the string of the other (not Cthulhu) dark equatorial regions we informally identify as maculae that due to their regular spacing. The distinctive morphology in Tartarus Dorsa is often called the “bladed terrain” and sometimes “snakeskin” terrain. The “cellular terrain” usually refers to Sputnik Planitia, and the distinctive pits in southern Sputnik Planitia are sometimes referred to as “bacillae” due to the fact that their outlines bear a super􀀂cial resemblance to to the Bacilli taxanomic class of terrestrial bacteria. Mwindo Fossae was called “the spider” because of its shape. The bright-rimmed, dark-centered craters in Vega Terra were called“halo craters.” There is some dissected terrain in Venera Terrra which was called “fretted terrain.” The region northwest of Sputnik Planitia exhibits features that were called “washboard terrain.” The informal Coleta de Dados Colles was also initially referred to as a “Kli","cbCaik9qaffqJznZ","https://ap.wps.com/l/cbCaik9qaffqJznZ","pdf",7108123,"English","# Pluto nomenclature\n## Official IAU-approved names\n## Informal New Horizons team names\n## Colloquial nicknames\n# Charon naming notes\n# Feature naming structure and categories","[{\"question\":\"What is the purpose of this appendix on Pluto and Charon nomenclature?\",\"answer\":\"It provides a listing of Pluto and Charon names that are IAU-approved at the time of publication, alongside informal names used in the book and by the New Horizons Team.\"},{\"question\":\"Why might some names change in the future?\",\"answer\":\"Several informal names are treated as placeholders, and they may change depending on work by the New Horizons team and future IAU nomenclature decisions.\"},{\"question\":\"Are there any feature names for Pluto’s four small satellites?\",\"answer\":\"The appendix states that there are currently no feature names on Pluto’s four small satellites.\"}]","Pluto and Charon Nomenclature - Appendix A | PDF"]