DescripcióDactyl-HiRes.jpg	Galileo highest-res image asteroid Ida's moon (See below for details).
Data	13 de gener de 2004
Font	https://solarsystem.nasa.gov/galleries/dactyl
Autor	NASA/JPL
Permís (Com reutilitzar aquest fitxer)	Public domainPublic domainfalsefalse Aquest fitxer és en el domini públic perquè ha estat creat per la NASA. L'avís legal de la NASA diu que «el material de la NASA no està protegit per copyright si no es diu el contrari». (NASA copyright policy page o JPL Image Use Policy). Atenció: L'ús dels logotips de la NASA, insígnies i emblemes està restringit la llei dels EUA 14 CFR 1221. El lloc web de la NASA disposa d'un gran nombre d'imatges de l'Agència Espacial Russa, o soviètica, i d'altres agències no nord-americanes. Aquestes imatges no són necessàriament en el domini públic. El material del Telescopi espacial Hubble pot tenir els drets reservats si no prové explícitament del STScI. [1] Tot el material de la sonda SOHO està reservat i requereix d'autorització per a un ús comercial no educatiu. [2] Les imatges destacades en el lloc web Astronomy Picture of the Day (APOD) poden tenir drets d'autor. [3]

Resum

Original description from NASA:

Galileo highest-res image asteroid Ida's moon

This image is the most detailed picture of the recently discovered natural satellite of asteroid 243 Ida taken by the Galileo spacecraft's solid-state imaging camera during its encounter with the asteroid on August 28, 1993. Shuttered through the camera's broadband clear filter as part of a 30-frame mosaic designed to image the asteroid itself, this frame fortuitously captured the previously unknown moon at a range of about 3,900 kilometers (2,400 miles), just over 4 minutes before the spacecraft's closest approach to Ida. Each picture element spans about 39 meters (125 feet) on the surface of the moon.

More than a dozen craters larger than 80 meters (250 feet) in diameter are clearly evident, indicating that the moon has suffered numerous collisions from smaller solar system debris during its history. The larger crater on the terminator is about 300 meters (1,000 feet) across. The satellite is approximately egg-shaped, measuring about 1.2 by 1.4 by 1.6 kilometers (0.75 by 0.87 by 1 mile). At the time this image was shuttered, Ida was about 90 kilometers (56 miles) away from the moon, outside this frame to the left and slightly below center. This image was relayed to Earth from Galileo on June 8, 1994.

The Galileo project, whose primary mission is the exploration of the Jupiter system in 1995-97, is managed for NASA's Office of Space Science by the Jet Propulsion Laboratory.

P-44297 June 27, 1994