South Polar Impacts
This topographic map from NASA's Dawn mission shows the two large impact basins in the southern hemisphere of the giant asteroid Vesta. The map is color-coded by elevation, with red showing the higher areas and blue showing the lower areas. Rheasilvia, the largest impact basin on Vesta, is 310 miles (500 kilometers) in diameter. Scientists estimate that it formed 1 billion years ago by counting the number of smaller craters that have formed on top of it. The other basin, Veneneia, is 250 miles (400 kilometers) across and lies partially beneath Rheasilvia. Scientists estimate that Veneneia is at least 2 billion years old.
The topography was derived from images taken by Dawn's framing camera during Dawn's high-altitude mapping orbit, which averaged about 420 miles (680 kilometers) in altitude and took place from Sept. 30 to Nov. 2, 2011. The resolution during that orbit was about 200 feet (60 meters) per pixel.
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.
Aqueste fichièr conten d'entresenhas suplementàrias probablament apondudas per l’aparelh de fòto numeric o l'escanèr que las a aquesas. Se lo fichièr es estat modificat dempuèi son estat original, d'unes detalhs pòdon reflectir pas entièrament l’imatge modificat.
Orientacion
Normala
Resolucion orizontala
72 ppp
Resolucion verticala
72 ppp
Logicial utilizat
Adobe Photoshop CS5 Windows
Data e ora de cambiament del fichièr
3 mai de 2012 a 10.38
Espaci colorimetric
sRGB
Data e ora de numerizacion
20 octobre de 2010 a 10.14
Data de la darrièra modificacion de las metadonadas