Alter (cratère)

Alter
Image illustrative de l'article Alter (cratère)
Vue oblique du cratère Alter par la sonde Lunar Orbiter 5, en direction de l'ouest.
Localisation
Astre Lune
Coordonnées 18° 42′ N, 107° 30′ O[1],[2]
Géologie
Type de cratère Météoritique
Dimensions
Diamètre 64 km
Découverte
Éponyme Dinsmore Alter[2],[3]
Géolocalisation sur la carte : Lune
(Voir situation sur carte : Lune)
Alter (cratère)

Alter est un cratère d'impact sur la face cachée de la Lune. Le nom fut officiellement adopté par l'Union astronomique internationale (UAI) en 1970[4],[2],[3], en référence à Dinsmore Alter (1888-1968)[1],[2],[3]. Il est situé au sud-ouest du cratère Robertson qui est plus grand, et à l'est du cratère Ohm.

Cratères satellites

Les cratères dits satellites sont de petits cratères situés à proximité du cratère principal, ils sont nommés du même nom mais accompagné d'une lettre majuscule complémentaire (même si la formation de ces cratères est indépendante de la formation du cratère principal). Par convention, ces caractéristiques sont indiquées sur les cartes lunaires en plaçant la lettre sur le point le plus proche du cratère principal. Liste des cratères satellites de Alter [5] :

Alter Latitude Longitude Diamètre
K 16.3° N 106.0° W 22 km
W 20.4° N 109.2° W 52 km

Notes et références

  1. a et b (en) « Moon nomenclature - Crater », sur lunar.arc.nasa.gov The Lunar Prospector Website, NASA Ames Research Center.
  2. a b c et d (en) « Gazetteer of Planetary Nomenclature - Moon Nomenclature: Mons, montes », sur planetarynames.wr.usgs.gov Astrogeology Research Program, U.S. Geological Survey
  3. a b et c (de) « Krater mit individuellem Namen (Cratère avec nom individuel) », sur astrolink.de.
  4. En règle générale, l'UAI adopta officiellement le nom des cratères de la face visible de la Lune en 1935, ceux de la face cachée de la Lune en 1970, et certains petits cratères (anciennement des cratères satellites) furent renommés en 1976.
  5. Nomenclature complète des cratères lunaires « Lunar Craters », sur host.planet4589.org Lunar Nomenclature, Jonathan McDowell, .

Voir aussi

Articles connexes

Liens externes

  • (en) Site de la NASA sur tous les reliefs de la Lune : « Lunar Atlas », sur lunar.arc.nasa.gov The Lunar Prospector Website, NASA Ames Research Center.

Bibliographie

Liste des ouvrages de références pour les cratères lunaires :

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